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21. 发明授权

US5639575A Non-aqueous liquid electrolyte secondary battery 失效
标题翻译：非水电解液二次电池
公开(公告)号：US5639575A
公开(公告)日：1997-06-17
申请号：US582047
申请日：1996-01-02
申请人： Atsuo Omaru , Masayuki Nagamine , Naoyuki Date
发明人： Atsuo Omaru , Masayuki Nagamine , Naoyuki Date
IPC分类号： H01M4/58 , H01M6/14
CPC分类号： H01M10/05 , H01M4/583
摘要： A non-aqueous liquid electrolyte secondary battery using a carbon material satisfying predetermined conditions of true density and parameters of crystalline structure as an anode material, a transition metal composite oxide having predetermined ion supply capability as a cathode material, and ethylene carbonate as a non-aqueous solvent, is disclosed. The carbon material has a true density of 2.2 g/cm.sup.3 and greater, an interplanar distance of (002) plane of between 0.375 and 0.338 nm, inclusive a C-axis crystallite size of the (002) plane of 20.0 nm and greater and a G value in Raman spectrum of 2.5 and greater. The transition metal composite oxide contains lithium of an amount equivalent to a charge/discharge capacity of 300 mAh and greater per unit weight of the carbon material. The carbon material forming the anode has a grain diameter of 1 .mu.m and greater. The non-aqueous solvent is a mixed solvent of ethylene carbonate and chain carbonic ester. As the chain carbonic ester, diethyl carbonate, dimethyl carbonate or methylethyl carbonate is employed.
摘要翻译：使用满足真密度和结晶结构的规定条件的碳材料作为负极材料的碳素材料，具有预定离子供给能力的过渡金属复合氧化物作为阴极材料的非水电解液二次电池，水溶剂。碳材料的真密度为2.2g / cm 3以上，（002）面的面间距离为0.375〜0.338nm，（002）面的C轴微晶尺寸为20.0nm以上，a 拉曼光谱中的G值为2.5以上。过渡金属复合氧化物含有相当于每单位重量碳材料的充放电容量为300mAh以上的量的锂。形成阳极的碳材料的粒径为1μm以上。非水溶剂是碳酸亚乙酯和链状碳酸酯的混合溶剂。作为链状碳酸酯，使用碳酸二乙酯，碳酸二甲酯或碳酸甲乙酯。

22. 发明授权

US07659033B2 Graphite powders suited for negative electrode material of lithium ion secondary battery 失效
标题翻译：适用于锂离子二次电池负极材料的石墨粉
公开(公告)号：US07659033B2
公开(公告)日：2010-02-09
申请号：US11686204
申请日：2007-03-14
申请人： Koji Moriguchi , Mitsuhara Yonemura , Kazuhito Kamei , Masaru Abe , Hideya Kaminaka , Noriyuki Negi , Atsuo Omaru , Masayuki Nagamine
发明人： Koji Moriguchi , Mitsuhara Yonemura , Kazuhito Kamei , Masaru Abe , Hideya Kaminaka , Noriyuki Negi , Atsuo Omaru , Masayuki Nagamine
IPC分类号： H01M4/58 , C01B31/04
CPC分类号： H01M10/0525 , C01B32/20 , C01P2002/60 , C01P2002/72 , C01P2006/80 , H01M4/133 , H01M4/587 , H01M2004/021 , Y10T428/30
摘要： A graphite powder suitable for a negative electrode material of a lithium ion secondary battery which assures a high discharging capacity not lower than 320 mAh/g is to be manufactured at a lower cost. Specifically, a graphite powder containing 0.01 to 5.0 wt % of boron and having a looped closure structure at an end of a graphite c-planar layer on the surface of a powder, with the density of the interstitial planar sections between neighboring closure structures being not less than 100/μm and not more than 1500/μm, and with d002 being preferably not larger than 3.3650 Å, is manufactured by (1) heat-treating a carbon material pulverized at an elevated speed before or after carbonization for graphization at temperature exceeding 1500° C. or by (2) heat-treating the carbon material pulverized before or after carbonization at a temperature exceeding 1500° C. for graphization and subsequently further heat-treating the graphized material at a temperature exceeding a temperature of the oxidating heat treatment and the heat treatment in the inert gas.
摘要翻译：以更低的成本制造适合于确保高放电容量不低于320mAh / g的锂离子二次电池的负极材料的石墨粉末。具体地说，在粉末表面上，在石墨c平面层的端部含有0.01〜5.0重量％的硼并且具有环状封闭结构的石墨粉末，相邻闭合结构之间的间隙平面部分的密度不是小于100 /小时且不超过1500 / mum，d002优选不大于3.3650，通过以下方法制造：（1）在碳化之前或之后以高速粉碎的碳材料进行热处理，以在超过或者（2）在碳化之前或之后粉碎的碳材料在超过1500℃的温度下进行热处理，以进行石墨化，随后在超过氧化热处理温度的温度下进一步热处理石墨化材料并在惰性气体中进行热处理。

23. 发明申请

US20070154812A1 Graphite powders suited for negative electrode material of lithium ion secondary battery 失效
标题翻译：适用于锂离子二次电池负极材料的石墨粉
公开(公告)号：US20070154812A1
公开(公告)日：2007-07-05
申请号：US11686204
申请日：2007-03-14
申请人： Koji Moriguchi , Mitsuhara Yonemura , Kazuhito Kamei , Masaru Abe , Hideya Kaminaka , Noriyuki Negi , Atsuo Omaru , Masayuki Nagamine
发明人： Koji Moriguchi , Mitsuhara Yonemura , Kazuhito Kamei , Masaru Abe , Hideya Kaminaka , Noriyuki Negi , Atsuo Omaru , Masayuki Nagamine
IPC分类号： H01M4/58 , C01B31/04
CPC分类号： H01M10/0525 , C01B32/20 , C01P2002/60 , C01P2002/72 , C01P2006/80 , H01M4/133 , H01M4/587 , H01M2004/021 , Y10T428/30
摘要： A graphite powder suitable for a negative electrode material of a lithium ion secondary battery which assures a high discharging capacity not lower than 320 mAh/g is to be manufactured at a lower cost. Specifically, a graphite powder containing 0.01 to 5.0 wt % of boron and having a looped closure structure at an end of a graphite c-planar layer on the surface of a powder, with the density of the interstitial planar sections between neighboring closure structures being not less than 100/μm and not more than 1500/μm, and with d002 being preferably not larger than 3.3650 Å, is manufactured by (1) heat-treating a carbon material pulverized at an elevated speed before or after carbonization for graphization at temperature exceeding 1500° C. or by (2) heat-treating the carbon material pulverized before or after carbonization at a temperature exceeding 1500° C. forgraphization and subsequently firterheat-treating the graphized material at a temperature exceeding a temperature of the oxidating heat treatnent and the heat treatment in the inert gas.
摘要翻译：以更低的成本制造适合于确保高放电容量不低于320mAh / g的锂离子二次电池的负极材料的石墨粉末。具体地说，在粉末表面上，在石墨c平面层的端部含有0.01〜5.0重量％的硼并且具有环状封闭结构的石墨粉末，相邻闭合结构之间的间隙平面部分的密度不是通过（1）在碳化之前或之后以高速粉碎的碳材料进行热处理，以在温度下进行石墨化，制造小于100 / mum且不大于1500 / mum，d 002优选不大于3.3650 超过1500℃，或者（2）在碳化之前或之后粉碎的碳材料在超过1500℃的温度下进行热处理，然后在超过氧化热处理温度的温度下对石墨化材料进行热处理，惰性气体中的热处理。

24. 发明申请

US20060134523A1 Graphite powders suited for negative electrode material of lithium ion secondary battery 失效
标题翻译：适用于锂离子二次电池负极材料的石墨粉
公开(公告)号：US20060134523A1
公开(公告)日：2006-06-22
申请号：US10826233
申请日：2004-04-16
申请人： Koji Moriguchi , Mitsuharu Yonemura , Kazuhito Kamei , Masaru Abe , Hideya Kaminaka , Noriyuki Negi , Atsuo Omaru , Masayuki Nagamine
发明人： Koji Moriguchi , Mitsuharu Yonemura , Kazuhito Kamei , Masaru Abe , Hideya Kaminaka , Noriyuki Negi , Atsuo Omaru , Masayuki Nagamine
IPC分类号： H01M4/58 , C01B31/04
CPC分类号： H01M10/0525 , C01B32/20 , C01P2002/60 , C01P2002/72 , C01P2006/80 , H01M4/133 , H01M4/587 , H01M2004/021 , Y10T428/30
摘要： A graphite powder suitable for a negative electrode material of a lithium ion secondary battery which assures a high discharging capacity not lower than 320 mAh/g is to be manufactured at a lower cost. Specifically, a graphite powder containing 0.01 to 5.0 wt % of boron and having a looped closure structure at an end of a graphite c-planar layer on the surface of a powder, with the density of the interstitial planar sections between neighboring closure structures being not less than 100/μm and not more than 1500/μm, and with d002 being preferably not larger than 3.3650 Å, is manufactured by (1) heat-treating a carbon material pulverized at an elevated speed before or after carbonization for graphization at temperature exceeding 1500° C. or by (2) heat-treating the carbon material pulverized before or after carbonization at a temperature exceeding 1500° C. forgraphization and subsequently further heat-treating the graphized material at a temperature exceeding a temperature of the oxidating heat treatment and the heat treatment in the inert gas.
摘要翻译：以更低的成本制造适合于确保高放电容量不低于320mAh / g的锂离子二次电池的负极材料的石墨粉末。具体地说，在粉末表面上，在石墨c平面层的端部含有0.01〜5.0重量％的硼并且具有环状封闭结构的石墨粉末，相邻闭合结构之间的间隙平面部分的密度不是小于100 /小时且不超过1500 / mum，d002优选不大于3.3650，通过以下方法制造：（1）在碳化之前或之后以高速粉碎的碳材料进行热处理，以在超过或者（2）在碳化之前或之后粉碎的碳材料在超过1500℃的温度下热处理，然后在超过氧化热处理温度的温度下进一步热处理石墨化材料，惰性气体中的热处理。

25. 发明授权

US07214447B2 Graphite powders suited for negative electrode material of lithium ion secondary battery 失效
标题翻译：适用于锂离子二次电池负极材料的石墨粉
公开(公告)号：US07214447B2
公开(公告)日：2007-05-08
申请号：US10826233
申请日：2004-04-16
申请人： Koji Moriguchi , Mitsuhara Yonemura , Kazuhito Kamei , Masaru Abe , Hideya Kaminaka , Noriyuki Negi , Atsuo Omaru , Masayuki Nagamine
发明人： Koji Moriguchi , Mitsuhara Yonemura , Kazuhito Kamei , Masaru Abe , Hideya Kaminaka , Noriyuki Negi , Atsuo Omaru , Masayuki Nagamine
IPC分类号： H01M4/58 , C01B31/04
CPC分类号： H01M10/0525 , C01B32/20 , C01P2002/60 , C01P2002/72 , C01P2006/80 , H01M4/133 , H01M4/587 , H01M2004/021 , Y10T428/30
摘要： A graphite powder suitable for a negative electrode material of a lithium ion secondary battery which assures a high discharging capacity not lower than 320 mAh/g is to be manufactured at a lower cost. Specifically, a graphite powder containing 0.01 to 5.0 wt % of boron and having a looped closure structure at an end of a graphite c-planar layer on the surface of a powder, with the density of the interstitial planar sections between neighboring closure structures being not less than 100/μm and not more than 1500/μm, and with d002 being preferably not larger than 3.3650 Å, is manufactured by (1) heat-treating a carbon material pulverized at an elevated speed before or after carbonization for graphization at temperature exceeding 1500° C. or by (2) heat-treating the carbon material pulverized before or after carbonization at a temperature exceeding 1500° C. forgraphization and subsequently further heat-treating the graphized material at a temperature exceeding a temperature of the oxidating heat treatment and the heat treatment in the inert gas.
摘要翻译：要以更低的成本制造适合于确保高放电容量不低于320mAh / g的锂离子二次电池的负极材料的石墨粉末。具体地说，在粉末表面上，在石墨c平面层的端部含有0.01〜5.0重量％的硼并且具有环状封闭结构的石墨粉末，相邻闭合结构之间的间隙平面部分的密度不是通过（1）在碳化之前或之后以高速粉碎的碳材料进行热处理，以在温度下进行石墨化，制造小于100 / mum且不大于1500 / mum，d 002优选不大于3.3650 超过1500℃或通过（2）在碳化之前或之后粉碎的碳材料在超过1500℃的温度下进行热处理，进行热成像，然后在超过氧化热处理温度的温度下进一步热处理石墨化材料并在惰性气体中进行热处理。

26. 发明授权

US07070883B2 Non-aqueous electrolyte secondary battery 失效
标题翻译：非水电解质二次电池
公开(公告)号：US07070883B2
公开(公告)日：2006-07-04
申请号：US10715571
申请日：2003-11-18
申请人： Atsuo Omaru , Naoyuki Nakajima , Masayuki Nagamine
发明人： Atsuo Omaru , Naoyuki Nakajima , Masayuki Nagamine
IPC分类号： H01M4/62
CPC分类号： H01M10/0525 , H01M2/348 , H01M4/131 , H01M4/133 , H01M4/485 , H01M4/525 , H01M4/587 , H01M4/625 , H01M6/10 , H01M6/164 , H01M10/0587 , H01M2300/0025
摘要： In a non-aqueous electrolyte secondary battery including anode and cathode consisting of material capable of doping/undoping of lithium, and non-aqueous electrolytic solution in which electrolyte is dissolved in non-aqueous solvent, flaky graphite having high crystallinity and high electron conductivity is added as conductive agent into the anode and the cathode. Further, granulated carbon or carbon black having specific material property is added as conductive agent in addition to the flaky graphite. Thus, non-aqueous electrolyte secondary battery having long cycle life time and high reliability can be obtained.
摘要翻译：在包括由锂掺杂/脱掺杂的材料构成的阳极和阴极的非水电解质二次电池和其中电解质溶解在非水溶剂中的非水电解液中，具有高结晶度和高电子传导性的片状石墨是作为导电剂添加到阳极和阴极中。此外，除了片状石墨之外，还加入具有特定材料特性的造粒碳或炭黑作为导电剂。因此，可以获得具有长循环寿命和高可靠性的非水电解质二次电池。

27. 发明授权

US06277522B1 Non-aqueous electrolyte secondary cell cathode material and non-aqueous electrolyte secondary cell employing the cathode material 有权
标题翻译：非水电解质二次电池阴极材料和采用阴极材料的非水电解质二次电池
公开(公告)号：US06277522B1
公开(公告)日：2001-08-21
申请号：US09011781
申请日：1999-05-03
申请人： Atsuo Omaru , Naoyuki Nakajima , Masayuki Nagamine
发明人： Atsuo Omaru , Naoyuki Nakajima , Masayuki Nagamine
IPC分类号： H01M458
CPC分类号： D01F11/12 , D01F9/15 , H01M4/0433 , H01M4/133 , H01M4/587 , H01M10/0525 , H01M2004/021 , H01M2004/022 , H01M2300/004
摘要： Carbon fiber having cross sectional shape which satisfies area replenishment rate of 0.8 or more is used as anode material for non-aqueous electrolyte secondary battery. Alternatively, since value of fractal dimension of cross section high order structure of the random radial type carbon fiber can be utilized as material parameter for evaluating the cross sectional structure, carbon fiber in which the value of the fractal dimension is caused to fall within the range from 1.1 to 1.8 and the crystallinity has been controlled such that it falls within reasonable range is used as anode material for non-aqueous electrolyte secondary battery. Further, carbon fiber having cross section high order structure such that the central portion is radial type structure and the surface layer portion is random radial type structure is used as anode material for non-aqueous electrolyte secondary battery. Furthermore, it is also effective to use carbon fiber having notch structure at the cross section. In addition, graphitized carbon fiber having cross sectional portions different in the crystal structure at predetermined periods in the fiber length direction is made up. By crushing the graphitized carbon fiber thus obtained, carbon fiber crushed powder having less unevenness and predetermined aspect ratio can be easily made up.
摘要翻译：作为非水电解质二次电池的负极材料，使用满足0.8以上的区域补充率的截面形状的碳纤维。或者，由于可以利用随机径向型碳纤维的横截面高阶结构的分形尺寸的值作为用于评价截面结构的材料参数，其中使分形维数的值落在范围内的碳纤维 1.1〜1.8，结晶度控制在合理范围内，用作非水电解质二次电池的负极材料。此外，作为非水电解质二次电池的负极材料，使用具有横截面高阶结构的碳纤维，使得中心部分是径向型结构，表层部分是随机径向型结构。此外，在截面上使用具有凹口结构的碳纤维也是有效的。此外，在纤维长度方向上，在规定时间内，形成具有晶体结构不同的截面部分的石墨化碳纤维。通过粉碎由此获得的石墨化碳纤维，可以容易地制成具有较小不均匀性和预定纵横比的碳纤维粉碎粉末。

28. 发明授权

US5932373A Non-aqueous electrolyte secondary cell using carbonaceous material for negative electrode 失效
标题翻译：用于负极的碳质材料的非水电解质二次电池
公开(公告)号：US5932373A
公开(公告)日：1999-08-03
申请号：US828644
申请日：1997-03-31
申请人： Masayuki Nagamine , Atsuo Omaru , Naoyuki Nakajima
发明人： Masayuki Nagamine , Atsuo Omaru , Naoyuki Nakajima
IPC分类号： C01B31/02 , C01B31/04 , H01M4/133 , H01M4/1393 , H01M4/58 , H01M4/587 , H01M10/05 , H01M10/0525 , H01M10/0566 , H01M10/36 , H01M4/36
CPC分类号： H01M4/587 , C01B31/04 , H01M10/0525 , H01M4/133 , C01P2002/60 , C01P2002/78 , C01P2004/61 , H01M4/131 , H01M4/1393
摘要： A material for a negative electrode of a cell, which is prepared according to a process of the present invention, can provides a cell having a high true specific gravity, a high charging capacity and an excellent cycle characteristic. The process of the present invention comprises the steps of carbonizing an organic compound to form a carbide thereof, pulverizing said carbide to form a powder having an average particle size of 10 .mu.m to 2 mm, and sintering said powder of the carbide at a temperature of 2,000.degree. C. or higher to produce a graphite. In addition, in accordance with the present invention, there is also provided non-aqueous electrolyte secondary cell comprising a negative electrode, which is prepared by carbonizing an organic compound to form a carbide thereof, pulverizing the carbide to form a powder having an average particle size of 10 .mu.m to 2 mm, and sintering the powder of the carbide at a temperature of 2,000.degree. C. to form a graphite.
摘要翻译：根据本发明的方法制备的用于电池负极的材料可以提供具有高真比重，高充电能力和优异的循环特性的电池。本发明的方法包括以下步骤：将有机化合物碳化以形成其碳化物，粉碎所述碳化物以形成平均粒径为10μm至2mm的粉末，并将碳化物的粉末在温度为2000℃以上，生成石墨。此外，根据本发明，还提供了包含负极的非水电解质二次电池，其通过碳化有机化合物以形成其碳化物制备，粉碎碳化物以形成具有平均颗粒的粉末尺寸为10微米至2mm，并在2000℃的温度下烧结碳化物粉末以形成石墨。

29. 发明授权

US5667914A Process for preparing carbonaceous material for negative electrode of cell and non-aqueous electrolyte secondary cell using same 失效
标题翻译：制备电池用非质子电解质二次电池用负极碳质材料的方法
公开(公告)号：US5667914A
公开(公告)日：1997-09-16
申请号：US647755
申请日：1996-05-15
申请人： Masayuki Nagamine , Atsuo Omaru , Naoyuki Nakajima
发明人： Masayuki Nagamine , Atsuo Omaru , Naoyuki Nakajima
IPC分类号： C01B31/02 , C01B31/04 , H01M4/133 , H01M4/1393 , H01M4/58 , H01M4/587 , H01M10/05 , H01M10/0525 , H01M10/0566 , H01M10/36 , H01M10/40
CPC分类号： H01M4/587 , C01B31/04 , H01M10/0525 , H01M4/133 , C01P2002/60 , C01P2002/78 , C01P2004/61 , H01M4/131 , H01M4/1393
摘要： A material for a negative electrode of a cell, which is prepared according to a process of the present invention, can provides a cell having a high true specific gravity, a high charging capacity and an excellent cycle characteristic. The process of the present invention comprises the steps of carbonizing an organic compound to form a carbide thereof, pulverizing said carbide to form a powder having an average particle size of 10 .mu.m to 2 mm, and sintering said powder of the carbide at a temperature of 2,000.degree. C. or higher to produce a graphite. In addition, in accordance with the present invention, there is also provided non-aqueous electrolyte secondary cell comprising a negative electrode, which is prepared by carbonizing an organic compound to form a carbide thereof, pulverizing the carbide to form a powder having an average particle size of 10 .mu.m to 2 mm, and sintering the powder of the carbide at a temperature of 2,000.degree. C. to form a graphite.
摘要翻译：根据本发明的方法制备的用于电池负极的材料可以提供具有高真比重，高充电能力和优异的循环特性的电池。本发明的方法包括以下步骤：将有机化合物碳化以形成其碳化物，粉碎所述碳化物以形成平均粒径为10μm至2mm的粉末，并将碳化物的粉末在温度为2000℃以上，生成石墨。此外，根据本发明，还提供了包含负极的非水电解质二次电池，其通过碳化有机化合物以形成其碳化物制备，粉碎碳化物以形成具有平均颗粒的粉末尺寸为10微米至2mm，并在2000℃的温度下烧结碳化物粉末以形成石墨。

30. 发明授权

US5643426A Anode material and method of manufacturing the same 失效
标题翻译：阳极材料及其制造方法
公开(公告)号：US5643426A
公开(公告)日：1997-07-01
申请号：US507324
申请日：1995-08-23
申请人： Hiroshi Imoto , Atsuo Omaru , Hideto Azuma , Yoshio Nishi , Yoshihisa Gonno , Masayuki Nagamine
发明人： Hiroshi Imoto , Atsuo Omaru , Hideto Azuma , Yoshio Nishi , Yoshihisa Gonno , Masayuki Nagamine
IPC分类号： H01M4/02 , H01M4/38 , H01M4/58 , C25B11/12
CPC分类号： H01M4/587 , H01M4/13 , H01M4/583 , H01M10/0525 , H01M2004/021 , H01M2004/027
摘要： An anode material consisting of non-graphitizable carbon material obtained by baking carbon precursor is disclosed. In this non-graphitizable carbon material, ratio by weight of carbon Ps in stacking structure determined from diffraction peak originating in (002) crystal lattice plane and X-ray diffraction spectrum components on the lower angle side with respect to the diffraction peak originating in the (002) crystal lattice plane of X-ray diffraction spectrum is smaller than 0.59, or stacking index SI thereof is smaller than 0.76. Moreover, average number of carbon layers n.sub.ave in stacking structure is smaller than 2.46. Alternatively, when baking temperature is T.degree. C. and half width at half maximum of peak appearing in the vicinity of 1340 cm.sup.-1 in Raman spectrum is HW, the condition expressed below is satisfied.HW>138-0.06.multidot.TThis non-graphitizable carbon material is manufactured by allowing carbon precursor which becomes non-graphitizable carbon by baking to undergo heat treatment at temperature 600.degree. C. or more under inactive gas atmosphere of flow rate of 0.1 ml/sec. or more per carbon precursor 1 g, or to undergo heat treatment at temperature 600.degree. C. or more under the atmosphere of pressure less than 50 kPa. At this time, carbon precursor is mounted in a layered form so that the area in contact with the atmosphere is 10 cm.sup.2 or more per 1 Kg.
摘要翻译： PCT No.PCT / JP93 / 01929 Sec。 371日期1995年8月23日 102（e）日期1995年8月23日PCT 1993年12月28日PCT公布。 WO95 / 18467 PCT出版物日期：1995年7月6日公开了通过焙烧碳前体得到的由不可石墨化的碳材料构成的负极材料。在该不石墨化碳材料中，由源于（002）晶格面的衍射峰和下角侧的X射线衍射光谱成分相对于起源于（002）晶格面的衍射峰确定的层叠结构中的碳Ps的重量比 X射线衍射光谱的（002）晶格面小于0.59，或堆积指数SI小于0.76。此外，层叠结构中的碳层平均数小于2.46。或者，当烘烤温度为T℃时，在拉曼光谱中出现在1340cm -1附近的峰值半峰宽为HW，满足以下表达的条件：W> 138-0.06×T这种非石墨化碳通过在0.1ml /秒的流动速率的惰性气体气氛下，在600℃以上的温度下进行焙烧，使成为不可石墨化碳的碳前体进行热处理，从而制造材料。或更多的每碳前体1g，或在压力小于50kPa的气氛下在600℃或更高温度下进行热处理。此时，碳前驱体以层叠的形式安装，使得与大气接触的面积为每1Kg为10cm 2以上。

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