Multiphase, Multiscale Chemomechanics at Extreme Low Temperatures: Battery Electrodes for Operation in a Wide Temperature Range
Multiphase, Multiscale Chemomechanics at Extreme Low Temperatures: Battery Electrodes for Operation in a Wide Temperature Range
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DOI：
10.1002/aenm.202102122
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发表时间：
2021-08-21
影响因子：
27.8
通讯作者：
Liu, Yijin
中科院分区：
文献类型：
--
作者：
Li, Jizhou;Li, Shaofeng;Liu, Yijin
了解锂离子电池（LIB）在极端条件下的行为，例如低温，是在各种应用场景中广泛采用LIB的关键。LIB在低温下的性能差通常归因于电解质中的锂离子传输较差，这推动了新电解质的开发以及在电动汽车中流行的电池预热方法。然而，这些措施并没有解决重大的不可挽回的容量损失，也没有得到很好的理解。本文系统地阐述了复合材料LiNixMnyCozO2（NMC，x + y + z = 1）阴极在极低温度下的多相、多尺度化学力学行为。LIB的低温储存可导致活性电极中的不可逆结构损伤，这可对环境温度下的后续电池循环性能产生负面影响。除了开发具有稳定性能的电解质之外，设计用于宽温度范围的电池还需要开发当电池在不同温度之间切换时结构和形态上稳健的电极组件。
Understanding the behavior of lithium-ion batteries (LIBs) under extreme conditions, for example, low temperature, is key to broad adoption of LIBs in various application scenarios. LIBs, poor performance at low temperatures is often attributed to the inferior lithium-ion transport in the electrolyte, which has motivated new electrolyte development as well as the battery preheating approach that is popular in electric vehicles. A significant irrevocable capacity loss, however, is not resolved by these measures nor well understood. Herein, multiphase, multiscale chemomechanical behaviors in composite LiNixMnyCozO2 (NMC, x + y + z = 1) cathodes at extremely low temperatures are systematically elucidated. The low-temperature storage of LIBs can result in irreversible structural damage in active electrodes, which can negatively impact the subsequent battery cycling performance at ambient temperature. Beside developing electrolytes that have stable performance, designing batteries for use in a wide temperature range also calls for the development of electrode components that are structurally and morphologically robust when the cell is switched between different temperatures.