阶段转换中的休息:下一代电动汽车的充电习惯是否需要调整?

IF 5.4 Q2 CHEMISTRY, PHYSICAL
Nils Peter Wagner
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引用次数: 0

摘要

富镍正极材料是当前和下一代电动汽车中高能锂离子电池的常用正极材料。虽然富镍阴极具有高能量密度,但由于与其(脱)锂行为直接相关的几个因素,其循环寿命受到了影响。在高电荷状态下,富镍阴极会发生六方-六方转变,伴随着单胞参数的急剧变化。这种现象不利于电池的循环寿命。这项研究阐明了将 "LiNi0.8Mn0.1Co0.1O2 "石墨电池储存在 95% 的电荷状态下的效果,这种状态与上述转变相对应,每六个循环储存 10 小时。结果与在高荷电状态下不休息的电池和循环至 100 % 荷电状态的电池进行了比较。对所得循环数据的分析表明,与循环至 100% 电量状态相比,静置锂离子电池(基于富镍阴极的电池)不利于阻抗增长和容量衰减。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Rest in phase transition: Should charging habits in next generation EVs be adapted?

Nickel-rich cathode materials are a popular cathode for high energy lithium ion batteries in the current and next generation of electric vehicles. While nickel-rich cathodes offer high energy density, their cycle-life is compromised due to several factors directly related to their (de)lithiation behavior. At high state of charge the nickel-rich cathode experiences a hexagonal-hexagonal transition which is accompanied by drastic changes in the unit cell parameters. This phenomenon is detrimental for cycle-life of a battery cell. This work elucidates on the effect of storing LiNi0.8Mn0.1Co0.1O2‖Graphite cells at 95 % state of charge corresponding to the above-mentioned transition for 10 h every six cycles. The results are compared to cells cycled without a rest at high state of charge and cells cycled to 100 % state of charge. Analysis of the obtained cycling data shows that resting lithium ion cells based nickel-rich cathode based cells is detrimental leading to higher impedance growth and capacity decay than cycling to 100 % state of charge.

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来源期刊
CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
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