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    • 73. 发明授权
    • Stabilized electrochemical cell active material
    • 稳定的电化学电池活性材料
    • US06869547B2
    • 2005-03-22
    • US09974043
    • 2001-10-09
    • Jeremy BarkerM. Yazid SaldiJeffrey L. Swoyer
    • Jeremy BarkerM. Yazid SaldiJeffrey L. Swoyer
    • C01G45/00C01G45/12H01M4/50H01M4/505H01M4/62H01M10/0525H01M10/0567H01M10/36H01M4/02
    • H01M4/505C01G45/1242C01G45/125C01G45/1257C01P2002/32C01P2002/72C01P2002/77C01P2004/80C01P2004/84C01P2006/12C01P2006/40H01M4/62H01M10/0525H01M10/0567
    • Stabilized lithiated manganese oxide (LMO) is prepared by reacting cubic spinel lithium manganese oxide particles and particles of an alkali metal compound in air for a time and at a temperature sufficient to decompose at least a portion of the alkali metal compound, providing a treated lithium manganese oxide. The reaction product is characterized as particles having a core or bulk structure of cubic spinel lithium manganese oxide and a surface region which is enriched in Mn+4 relative to the bulk. X-ray diffraction data and x-ray photoelectron spectroscopy data are consistent with the structure of the stabilized LMO being a central bulk of cubic spinel lithium manganese oxide with a surface layer or region comprising A2MnO3, where A is an alkali metal. Electrochemical cells containing the stabilized LMO of the invention have improved charging and discharging characteristics and maintain integrity over a prolonged life cycle. The electrochemical cells are stabilized against decomposition of cell components, including electrode and electrolyte components.
    • 通过使立方尖晶石锂锰氧化物颗粒和碱金属化合物颗粒在空气中反应一段时间并在足以分解至少一部分碱金属化合物的温度下制备稳定的锂化锰氧化物(LMO),从而提供处理过的锂 氧化锰。 反应产物的特征在于具有立方尖晶石锂锰氧化物的核心或体积结构的颗粒和相对于体积富含Mn +4的表面区域。 X射线衍射数据和X射线光电子能谱数据与稳定的LMO的结构一致,稳定的LMO是具有包含A2MnO3的表面层或区域的立方尖晶石锂锰氧化物的中心体,其中A是碱金属。 包含本发明的稳定的LMO的电化学电池具有改善的充电和放电特性并且在延长的寿命周期内保持完整性。 电化学电池被稳定以防止细胞成分的分解,包括电极和电解质组分。
    • 79. 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。