CHARGING METHOD AND CHARGINGDISCHARGING METHOD OF

专利名称：CHARGING METHOD AND

CHARGING/DISCHARGING METHOD OFLITHIUM ION SECONDARY BATTERY

发明人：Ryoichi Tanaka,Yasuhiko Hina,Akira Nagasaki申请号：US12680095申请日：20090326

公开号：US20100207583A1公开日：20100819

专利附图：

摘要：The present invention relates to a charging method of a lithium ion secondarybattery including, as a positive electrode active material, a lithium-containing composite

oxide containing nickel and cobalt and having a layered crystal structure. The chargingmethod includes a first step of charging the battery at a first current of 0.5 to 0.7 It untilthe charge voltage of the battery reaches a first upper limit voltage of 3.8 to 4.0 V; asecond step of charging the battery, upon completion of the first step, at a secondcurrent smaller than the first current until the charge voltage of the battery reaches asecond upper limit voltage greater than the first upper limit voltage; and a third step ofcharging the battery, upon completion of the second step, at the second upper limitvoltage. This provides a charging method of a lithium ion secondary battery, the methodcapable of achieving both a shortened charging time and an improvement incharge/discharge cycle life characteristics.

申请人：Ryoichi Tanaka,Yasuhiko Hina,Akira Nagasaki

地址：Osaka JP,Hyogo JP,Osaka JP

国籍：JP,JP,JP

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