Main aging mechanisms in Li ion batteries
Main aging mechanisms in Li ion batteries
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DOI：
10.1016/j.jpowsour.2005.03.172
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发表时间：
2005-08-26
影响因子：
9.2
通讯作者：
Staniewicz, RJ
中科院分区：
文献类型：
--
作者：
Broussely, M;Biensan, P;Staniewicz, RJ
从长期存储或循环数据中描述了锂离子电池中发生的一些老化机制，无论是在静置状态下还是在循环状态下。一般来说，电池最关键的部分是负极/电解液界面。固体电解质界面(SEI)的稳定性，更广泛地说是钝化层的稳定性，必须通过适当的材料选择和添加剂来确保。随着时间的推移，过多的生长会导致与锂腐蚀相对应的容量损失，并由于活性表面积的退化而导致电极功率能力的降低。在最坏的情况下，充电率能力的降低可能会导致循环过程中局部镀锂，严重加剧容量衰退。当SEI被正确构建时，由于电子电导率低，负电极的稳定性可以非常稳定，正如在高于环境温度下的长期老化(超过4年)所描述的那样。碳酸乙烯酯被确认为性能优异的添加剂。在高温下，高SOC会在正极界面引起副反应，包括电解液组分的氧化。结果是电池阻抗增加，可能会减缓二氧化碳的释放。碳酸锂的存在极大地促进了天然气的形成。观察到的阻抗增加表明活性表面积减小，这与固体沉积的结果一致。如果设计得当，选择适当的活性材料和电解液，锂离子系统可以提供非常长的使用寿命。(C)2005 Elsevier B.V.保留所有权利。
Some of the aging mechanisms occurring in Li ion batteries, either on rest or on cycling, are described from long-term storage or cycling data. Generally, the most critical part of the cell is the negative electrode/electrolyte interface. Stability of the solid electrolyte interface (SEI), more generally of the passivating layer, must be insured by proper material choice and additives. Excessive growth induces with time a capacity loss corresponding to the lithium corrosion, and a reduction of power capability of the electrode, from the active surface area degradation. In a worst case, reduction of charge rate capability may lead to local lithium plating during cycling, strongly aggravating the capacity fading. When the SEI is correctly built, with low electronic conductivity, the negative electrode stability can be very stable, as described by long-term aging (more than 4 years) at higher temperature than ambient. Vinylen carbonate is confirmed as outstanding additive. At elevated temperature, high SOC induces side reactions at the positive interface, involving electrolyte components oxidation. The results are an increase of cell impedance, and possible Slow CO2 evolution. Presence of lithium carbonate greatly enhanced the gas formation. The observed impedance increase indicates a reduction of the active surface area, in agreement with solid deposit. When properly designed with an appropriate choice of active materials and electrolyte, the Li ion system can provide a very long service. (c) 2005 Elsevier B.V. All rights reserved.