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    • 46. 发明授权
    • Stabilized electrochemical cell
    • 稳定电化学电池
    • US5869207A
    • 1999-02-09
    • US762081
    • 1996-12-09
    • M. Yazid SaidiChariclea Scordilis-KelleyJeremy Barker
    • M. Yazid SaidiChariclea Scordilis-KelleyJeremy Barker
    • C01G45/00H01M4/50H01M4/505H01M4/62H01M10/0525H01M10/0567H01M10/36
    • H01M4/505C01G45/1221C01G45/1242H01M10/0567H01M4/62C01P2006/40H01M10/0525
    • The present invention provides a novel composition and method for preventing decomposition of one or more electrochemical cell components comprising an electrode having an active material, and an electrolyte. The method of the invention, for the first time, effectively overcomes problems which arise between the interaction of cell components and contaminate water retained in a cell. Such contaminate water reacts with the electrolyte which comprises a salt of lithium in a solvent. Solubilizing of the salt in solution with attendant interaction between the salt and water causes formation of hydrogen-containing acids. The method of the invention effectively blocks decomposition of a lithium metal oxide cathode active material, and particularly lithium manganese oxide (LMO, nominally LiMn.sub.2 O.sub.4). Such decomposition is prevented by including in the cell a basic compound which forms an electron donor species in the electrolyte solution; and by neutralizing at least a portion of the acid by reacting the donor species with the hydrogen-containing acids thereby preventing decomposition of the lithium manganese oxide by the acid. The preservation of the lithium manganese oxide prevents degradation of other cell components by other mechanism.
    • 本发明提供一种用于防止一种或多种电化学电池元件分解的新型组合物和方法,所述电化学电池组件包括具有活性材料的电极和电解质。 本发明的方法第一次有效地克服了细胞成分的相互作用和污染细胞中残留的水之间产生的问题。 这种污染水与包含锂在溶剂中的盐的电解质反应。 溶解盐中的盐与盐和水之间伴随的相互作用引起含氢酸的形成。 本发明的方法有效地阻止锂金属氧化物正极活性物质,特别是锰酸锂(LMO,名义上是LiMn 2 O 4)的分解。 通过在电解液中包含在电解质溶液中形成电子供体物质的碱性化合物来防止这种分解; 并且通过使供体物质与含氢酸反应从而中和酸的至少一部分,从而防止酸分解锰酸锂。 锂锰氧化物的保存通过其他机理防止其他电池组分的降解。
    • 50. 发明授权
    • Battery active materials and methods for synthesis
    • 电池活性物质和合成方法
    • US07901810B2
    • 2011-03-08
    • US10848452
    • 2004-05-17
    • Jeremy BarkerM. Yazid SaidiJeffrey Swoyer
    • Jeremy BarkerM. Yazid SaidiJeffrey Swoyer
    • H01M4/58H01M4/88H01M4/00
    • C01B25/37H01M4/5825H01M10/0525
    • Active materials for rechargeable batteries have a general formula Aa(MO)bM′cXO4 where A represents an alkali metal or mixture of alkali metals, a is greater than about 0.1 and less than or equal to about 2; MO is an ion containing a transition metal M not in its highest oxidation state, M′ represents a metal, or mixture of metals, and b is greater than 0 and less than or equal to about 1, c is less than 1 wherein a, b and c are selected so as to maintain the electroneutrality of the compound, and X is phosphorus, arsenic, or sulfur, or mixtures thereof. Preferred active materials are alkali metal vanadyl metal phosphates of general formula Aa(VO)bM′cPO4 where a and b are both greater than 0 and c may be zero or greater. New synthetic routes are provided to alkali metal mixed metal phosphates where at least one of the starting materials is a metal-oxo group (MO)3+, where M represents a metal in a +5 oxidation state. Reductive methods are provided for reacting a metal-oxo phosphate with an alkali metal compound in the presence of reducing carbon. The carbothermal reduction step can for example result in the reduction of a +5 metal to a +4 state or lower.
    • 用于可再充电电池的活性材料具有通式Aa(MO)bM'cXO4,其中A表示碱金属或碱金属的混合物,a大于约0.1且小于或等于约2; MO是含有不处于其最高氧化态的过渡金属M的离子,M'表示金属或金属的混合物,b大于0且小于或等于约1,c小于1,其中a, 选择b和c以保持化合物的电中性,X是磷,砷或硫,或其混合物。 优选的活性物质是通式为Aa(VO)bM'cPO4的碱金属氧钒基金属磷酸盐,其中a和b都大于0,c可以为零或更大。 向碱金属混合金属磷酸盐提供新的合成路线,其中至少一种原料是金属 - 氧代基(MO)3+,其中M表示+5氧化态的金属。 提供还原方法,用于在还原性碳存在下使金属 - 氧代磷酸酯与碱金属化合物反应。 碳热还原步骤可以例如将+5金属还原成+4状态或更低。