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    • 12. 发明申请
    • PRODUCTION PROCESS FOR LITHIUM-SILICATE-SYSTEM COMPOUND
    • 硅酸盐体系化合物的生产工艺
    • US20110291055A1
    • 2011-12-01
    • US13147747
    • 2009-11-20
    • Toshikatsu KojimaTetsuo SakaiTakuhiro MiyukiYasue OkumuraAkira KojimaJunichi NiwaHitotoshi Murase
    • Toshikatsu KojimaTetsuo SakaiTakuhiro MiyukiYasue OkumuraAkira KojimaJunichi NiwaHitotoshi Murase
    • H01M4/58H01B1/18
    • H01M4/5825C01B33/32H01M10/052Y02E60/122Y02P70/54
    • The present invention is one which provides a production process for lithium-silicate-system compound, the production process being characterized in that: a lithium-silicate compound being expressed by Li2SiO3 is reacted with a substance including at least one member of transition-metal elements that is selected from the group consisting of iron and manganese at 400-650° C. in a molten salt of a carbonate mixture comprising lithium carbonate and at least one member of alkali-metal carbonates that is selected from the group consisting of potassium carbonate, sodium carbonate, rubidium carbonate and cesium carbonate in a mixed-gas atmosphere including carbon dioxide and a reducing gas; and a positive-electrode active material for lithium-ion secondary battery that comprises a lithium-silicate-system compound being obtained by the aforesaid process.In accordance with the present invention, it becomes feasible to produce lithium-silicate-system materials, which are useful as positive-electrode active materials for lithium-ion secondary battery, and the like, by means of relatively simple and easy means.
    • 本发明是提供一种硅酸锂系化合物的制造方法,其制造方法的特征在于:将由Li 2 SiO 3表示的硅酸锂化合物与包含至少一种过渡金属元素的物质 选自铁和锰在400-650℃的碳酸盐混合物的熔融盐中的碳酸盐混合物,所述碳酸盐混合物包含碳酸锂和至少一种碱金属碳酸盐成员,所述碱金属碳酸盐选自碳酸钾, 碳酸钠,碳酸铷和碳酸铯在包括二氧化碳和还原气体的混合气体气氛中; 以及锂离子二次电池用正极活性物质,其包含通过上述方法得到的硅酸锂系化合物。 根据本发明,通过相对简单且容易的手段,可以生产用作锂离子二次电池的正极活性物质等的硅酸锂系材料。
    • 20. 发明申请
    • LITHIUM-ION SECONDARY BATTERY
    • 锂离子二次电池
    • US20120321955A1
    • 2012-12-20
    • US13581355
    • 2011-04-01
    • Naoto YasudaToru AbeJunichi Niwa
    • Naoto YasudaToru AbeJunichi Niwa
    • H01M4/505H01M4/485H01M4/52H01M4/54
    • H01M4/505H01M4/131H01M4/386H01M4/387H01M4/525H01M4/587H01M10/052Y02T10/7011
    • A lithium-ion secondary battery is characterized in that it is equipped with: a positive electrode comprising a positive-electrode active material that includes a lithium-transition metal composite oxide including at least lithium and manganese and possessing a layered rock-salt structure; a negative electrode comprising a negative-electrode active material that includes at least one kind of carbon-based materials, silicon-based materials, and tin-based materials; and a non-aqueous electrolytic solution, wherein: said lithium-transition metal composite oxide exhibits an irreversible capacity; and an actual capacity of said negative electrode at the time of first-round charging up to 0 V with respect to metallic lithium is smaller than an actual capacity of said positive electrode at the time of first-round charging up to 4.7 V with respect to metallic lithium. Even when an employment amount of the active materials is reduced less than those conventional amounts, the resulting battery capacity hardly declines.
    • 锂离子二次电池的特征在于,其具备:包含正极活性物质的正极,所述正极活性物质包括至少包含锂和锰的锂 - 过渡金属复合氧化物,并具有层状岩盐结构; 包含负极活性物质的负极,所述负极活性物质包含至少一种碳类材料,硅类材料和锡类材料; 和非水电解液,其中:所述锂 - 过渡金属复合氧化物具有不可逆容量; 并且相对于金属锂在第一次充电至0V时的所述负极的实际容量小于相对于第一次充电高达4.7V时的所述正极的实际容量 金属锂。 即使活性物质的使用量比常规量减少,所得电池容量几乎不下降。