Li₂CO₃ in LiNi_0.8Co_0.15Al_0.05O₂ cathodes and its effects on capacity and power

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• 作者：Zhuang ; Guorong V. ; Chen ; Guoying ; Shim ; Joongpyo ; Song ; Xiangyun ; Ross ; Philip N. ; Richardson ; Thomas J.
• 关键词：Lithium batteries ; Battery power ; Battery capacity ; Power fade ; Capacity fade
• 刊名：Journal of Power Sources
• 出版年：2004
• 出版时间：August 12, 2004
• 年：2004
• 卷：134
• 期：2
• 页码：293-297
• 全文大小：178 K

文摘

Lithium carbonate is commonly found on the surfaces of lithiated cathode active materials that have been exposed to air. Long-term exposure of LiNi_0.8Co_0.15Al_0.05O₂ electrodes produced a dense Li₂CO₃ coating, approximately 10nm in thickness that severely reduced both the accessible capacity and the rate at which the electrodes could be cycled. Ex situ X-ray diffraction patterns of cycled electrodes revealed a bimodal distribution of active material in different states of charge. Particle isolation is proposed to contribute to both capacity and power losses, and possible mechanisms related to the formation of Li₂CO₃ are discussed.