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Electronic devices, lithium-ion secondary batteries, and positive electrode active materials for lithium-ion secondary batteries
Electronic devices, lithium-ion secondary batteries, and positive electrode active materials for lithium-ion secondary batteries
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机译:电子设备,锂离子二次电池以及锂离子二次电池用正极活性物质
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摘要
Provided is a positive electrode active material for a lithium ion secondary battery having favorable cycle characteristics and high capacity. A covering layer containing aluminum and a covering layer containing magnesium are provided on a superficial portion of the positive electrode active material. The covering layer containing magnesium exists in a region closer to a particle surface than the covering layer containing aluminum is. The covering layer containing aluminum can be formed by a sol-gel method using an aluminum alkoxide. The covering layer containing magnesium can be formed as follows: magnesium and fluorine are mixed as a starting material and then subjected to heating after the sol-gel step, so that magnesium is segregated.
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