Role of Manganese Deposition on Graphite in the Capacity Fading of Lithium Ion Batteries

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• 作者：Daniel R. Vissers ; Zonghai Chen ; Yuyan Shao ; Mark Engelhard ; Ujjal Das ; Paul Redfern ; Larry A. Curtiss ; Baofei Pan ; Jun Liu ; Khalil Amine
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：June 8, 2016
• 年：2016
• 卷：8
• 期：22
• 页码：14244-14251
• 全文大小：420K
• 年卷期：0
• ISSN：1944-8252

文摘

Lithium ion batteries utilizing manganese-based cathodes have received considerable interest in recent years for their lower cost and more favorable environmental friendliness relative to their cobalt counterparts. However, Li ion batteries using these cathodes combined with graphite anodes suffer from severe capacity fading at high operating temperatures. In this paper, we report on how the dissolution of manganese impacts the capacity fading within the Li ion batteries. Our investigation reveals that the manganese dissolves from the cathode, transports to the graphite electrode, and deposits onto the outer surface of the innermost solid-electrolyte interphase layer, which is known to be a mixture of inorganic salts (e.g., Li₂CO₃, LiF, and Li₂O). In this location, the manganese facilitates the reduction of the electrolyte and the subsequent formation of lithium-containing products on the graphite, which removes lithium ions from the normal operation of the cell and thereby induces the severe capacity fade.