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High‐Voltage Layered Ternary Oxide Cathode Materials: Failure Mechanisms and Modification Methods†
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2020-08-14 , DOI: 10.1002/cjoc.202000344 Xiaodan Wang 1 , Ying Bai 1 , Xinran Wang 1 , Chuan Wu 1, 2
Due to the large reversible capacity, high operating voltage and low cost, layered ternary oxide cathode materials LiNixCoyAl1−x−yO2 (NCA) and LiNixCoyMn1−x−yO2 (NCM) are considered as the most potential candidate materials for lithium‐ion batteries (LIBs) used in (hybrid) electric vehicles (EVs). However, next‐generation long‐range EVs require a high specific capacity (around 203 mAh·g–1 at 3.7V) at the cathode active material level, which is not provided with current commercially layered ternary oxide cathodes. Increasing the operating voltage is an effective method to improve the specific capacity of the cathode and the energy density of the battery, but the high operating voltage also causes a lot of problems, such as cation mixing and phase transformation, electrolyte decomposition, transition metal dissolution and microcracks. So far, researchers have carried out a lot of works to solve these issues. Surface coating, element doping and the design of electrolytes have been proved to be effective solutions. In this review, the failure mechanisms and modification methods of high‐voltage layered ternary oxide cathode materials are summarized, which could provide valuable information to the research of high‐voltage layered ternary oxide cathode materials in basic science and industrial production.
中文翻译：
高压层状三元氧化物阴极材料：失效机理和改性方法†
由于具有大的可逆容量，较高的工作电压和较低的成本，层状三元氧化物阴极材料LiNi x Co y Al 1-x-y O 2 （NCA）和LiNi x Co y Mn 1-x-y O 2 （NCM）被认为是（混合）电动汽车（EV）中使用的锂离子电池（LIB）的最有可能的候选材料。但是，下一代远程电动汽车需要较高的比容量（约203 mAh·g –1 （在3.7V时）（在3.7V时）的正极活性物质水平上，而目前没有在市场上销售这种分层的三元氧化物阴极。增加工作电压是提高阴极的比容量和电池能量密度的有效方法，但是高工作电压也会引起很多问题，例如阳离子混合和相变，电解质分解，过渡金属溶解和微裂纹。到目前为止，研究人员已经进行了许多工作来解决这些问题。表面涂层，元素掺杂和电解质设计已被证明是有效的解决方案。本文综述了高压层状三元氧化物阴极材料的失效机理和改性方法，
更新日期：2020-08-14
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2020-08-14 , DOI: 10.1002/cjoc.202000344 Xiaodan Wang 1 , Ying Bai 1 , Xinran Wang 1 , Chuan Wu 1, 2
Affiliation
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Due to the large reversible capacity, high operating voltage and low cost, layered ternary oxide cathode materials LiNixCoyAl1−x−yO2 (NCA) and LiNixCoyMn1−x−yO2 (NCM) are considered as the most potential candidate materials for lithium‐ion batteries (LIBs) used in (hybrid) electric vehicles (EVs). However, next‐generation long‐range EVs require a high specific capacity (around 203 mAh·g–1 at 3.7V) at the cathode active material level, which is not provided with current commercially layered ternary oxide cathodes. Increasing the operating voltage is an effective method to improve the specific capacity of the cathode and the energy density of the battery, but the high operating voltage also causes a lot of problems, such as cation mixing and phase transformation, electrolyte decomposition, transition metal dissolution and microcracks. So far, researchers have carried out a lot of works to solve these issues. Surface coating, element doping and the design of electrolytes have been proved to be effective solutions. In this review, the failure mechanisms and modification methods of high‐voltage layered ternary oxide cathode materials are summarized, which could provide valuable information to the research of high‐voltage layered ternary oxide cathode materials in basic science and industrial production.
中文翻译：
高压层状三元氧化物阴极材料：失效机理和改性方法†
由于具有大的可逆容量，较高的工作电压和较低的成本，层状三元氧化物阴极材料LiNi x Co y Al 1-x-y O 2 （NCA）和LiNi x Co y Mn 1-x-y O 2 （NCM）被认为是（混合）电动汽车（EV）中使用的锂离子电池（LIB）的最有可能的候选材料。但是，下一代远程电动汽车需要较高的比容量（约203 mAh·g –1 （在3.7V时）（在3.7V时）的正极活性物质水平上，而目前没有在市场上销售这种分层的三元氧化物阴极。增加工作电压是提高阴极的比容量和电池能量密度的有效方法，但是高工作电压也会引起很多问题，例如阳离子混合和相变，电解质分解，过渡金属溶解和微裂纹。到目前为止，研究人员已经进行了许多工作来解决这些问题。表面涂层，元素掺杂和电解质设计已被证明是有效的解决方案。本文综述了高压层状三元氧化物阴极材料的失效机理和改性方法，
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