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公开(公告)号：US08236453B2
公开(公告)日：2012-08-07
申请号：US13042653
申请日：2011-03-08
IPC分类号： H01M4/58
CPC分类号： H01M4/5825 , C01B25/37 , C01B25/375 , C01B25/45 , H01M4/131 , H01M4/1391 , H01M4/36 , H01M4/366 , H01M4/62 , H01M4/624 , H01M4/625 , H01M6/185 , H01M10/052 , H01M10/0562 , H01M2004/021 , H01M2004/028
摘要： The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO4, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700° C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePO4, phase, coated with conductive carbon. When this powder is used as active material in a lithium insertion-type electrode, fast charge and discharge rates are obtained at room temperature and an excellent capacity retention is observed.
摘要翻译： 本发明提供了一种用于合成具有橄榄石或NASICON结构的碳涂覆粉末的新途径，其形成用于制造可再充电锂电池的有希望的活性产品类别。 由于所述结构的电子导电性差，所以粉末颗粒的碳涂层是必需的，以获得良好的性能。 为了制备涂覆的LiFePO 4，将Li，Fe和磷酸盐源与多元羧酸和多元醇一起溶解在水溶液中。 当水蒸发时，在形成含有Li，Fe和磷酸盐的混合沉淀物的同时发生聚酯化。 然后将树脂包封的混合物在还原气氛中在700℃下进行热处理。 这导致生产由用导电碳涂覆的橄榄石LiFePO 4相的细粉末。 当这种粉末用作锂插入型电极中的活性材料时，在室温下能够获得快速的充放电率，并且观察到优异的容量保持率。
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公开(公告)号：US07618747B2
公开(公告)日：2009-11-17
申请号：US10518560
申请日：2003-06-19
CPC分类号： H01M4/5825 , C01B25/37 , C01B25/375 , C01B25/45 , H01M4/131 , H01M4/1391 , H01M4/36 , H01M4/366 , H01M4/62 , H01M4/624 , H01M4/625 , H01M6/185 , H01M10/052 , H01M10/0562 , H01M2004/021 , H01M2004/028
摘要： The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO4, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700° C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePO4 phase, coated with conductive carbon. When this powder is used as active material in a lithium insertion-type electrode, fast charge and discharge rates are obtained at room temperature and an excellent capacity retention is observed.
摘要翻译： 本发明提供了一种用于合成具有橄榄石或NASICON结构的碳涂覆粉末的新途径，其形成用于制造可再充电锂电池的有希望的活性产品类别。 由于所述结构的电子导电性差，所以粉末颗粒的碳涂层是必需的，以获得良好的性能。 为了制备涂覆的LiFePO 4，将Li，Fe和磷酸盐源与多元羧酸和多元醇一起溶解在水溶液中。 当水蒸发时，在形成含有Li，Fe和磷酸盐的混合沉淀物的同时发生聚酯化。 然后将树脂包封的混合物在还原气氛中在700℃下进行热处理。 这导致由导电碳涂覆的由橄榄石LiFePO 4相组成的细粉末的生产。 当这种粉末用作锂插入型电极中的活性材料时，在室温下能够获得快速的充放电率，并且观察到优异的容量保持率。
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公开(公告)号：US07923154B2
公开(公告)日：2011-04-12
申请号：US12270969
申请日：2008-11-14
IPC分类号： H01M4/58
CPC分类号： H01M4/5825 , C01B25/37 , C01B25/375 , C01B25/45 , H01M4/131 , H01M4/1391 , H01M4/36 , H01M4/366 , H01M4/62 , H01M4/624 , H01M4/625 , H01M6/185 , H01M10/052 , H01M10/0562 , H01M2004/021 , H01M2004/028
摘要： The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO4, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700° C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePO4 phase, coated with conductive carbon. When this powder is used as active material in a lithium insertion-type electrode, fast charge and discharge rates are obtained at room temperature and an excellent capacity retention is observed.
摘要翻译： 本发明提供了一种用于合成具有橄榄石或NASICON结构的碳涂覆粉末的新途径，其形成用于制造可再充电锂电池的有希望的活性产品类别。 由于所述结构的电子导电性差，所以粉末颗粒的碳涂层是必需的，以获得良好的性能。 为了制备涂覆的LiFePO 4，将Li，Fe和磷酸盐源与多元羧酸和多元醇一起溶解在水溶液中。 当水蒸发时，在形成含有Li，Fe和磷酸盐的混合沉淀物的同时发生聚酯化。 然后将树脂包封的混合物在还原气氛中在700℃下进行热处理。 这导致由导电碳涂覆的由橄榄石LiFePO 4相组成的细粉末的生产。 当这种粉末用作锂插入型电极中的活性材料时，在室温下能够获得快速的充放电率，并且观察到优异的容量保持率。
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公开(公告)号：US20060035150A1
公开(公告)日：2006-02-16
申请号：US10518560
申请日：2003-06-19
CPC分类号： H01M4/5825 , C01B25/37 , C01B25/375 , C01B25/45 , H01M4/131 , H01M4/1391 , H01M4/36 , H01M4/366 , H01M4/62 , H01M4/624 , H01M4/625 , H01M6/185 , H01M10/052 , H01M10/0562 , H01M2004/021 , H01M2004/028
摘要： The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO4, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700° C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePO4 phase, coated with conductive carbon. When this powder is used as active material in a lithium insertion-type electrode, fast charge and discharge rates are obtained at room temperature and an excellent capacity retention is observed.
摘要翻译： 本发明提供了一种用于合成具有橄榄石或NASICON结构的碳涂覆粉末的新途径，其形成用于制造可再充电锂电池的有希望的活性产品类别。 由于所述结构的电子导电性差，所以粉末颗粒的碳涂层是必需的，以获得良好的性能。 为了制备涂覆的LiFePO 4，将Li，Fe和磷酸盐源与多元羧酸和多元醇一起溶解在水溶液中。 当水蒸发时，在形成含有Li，Fe和磷酸盐的混合沉淀物的同时发生聚酯化。 然后将树脂包封的混合物在还原气氛中在700℃下进行热处理。 这导致生产由导电碳涂覆的由橄榄石LiFePO 4 N 4相组成的细粉末。 当这种粉末用作锂插入型电极中的活性材料时，在室温下能够获得快速的充放电率，并且观察到优异的容量保持率。
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