苯基和酸酐官能团添加剂对LiNi0.8Co0.1Mn0.1O2||SiO/石墨袋状电池宽温工作性能的影响

Chengyun Wang, Jin Chen, Yaowei Feng, Xiuqin Deng, Xiaoxian Pang, Hanbo Zou, Wei Yang, Shengzhou Chen, Xijun Xu
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引用次数: 0

摘要

高镍LiNi0.8Co0.1Mn0.1O2 (NCM811)阴极与硅基石墨(SiO/Gr)配对是提高锂离子电池能量密度的关键。然而,NCM811与电解质的高反应性以及与SiO/Gr相关的体积膨胀问题对其实际应用构成了重大挑战。为了解决这些问题,我们探索了苯基和酸酐基团添加剂对NCM811‖SiO/Gr袋状电池在−20°C~60°C宽温度范围内性能的影响。酸酐添加剂能够降低NCM811‖SiO/Gr袋状电池的内阻,并在操作阶段抑制气体的析出和厚度的增加。值得注意的是,添加了柠檬酸酐(CAn)和丁二酸酐(SAn)添加剂的电池在45°C循环120次后,容量保持率分别从83.2%提高到88.1%和85.5%。有趣的是,电解质中含有苯基添加剂被发现有利于NCM811‖SiO/Gr袋状电池的低温性能。此外,两种官能团在室内条件下都没有显著提高性能。因此,添加剂的组合是必要的,以满足lib的极端环境应用的严格要求。这项工作指导了高能量密度宽温度操作lib复合电解质的设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of Additives With Phenyl and Acid Anhydride Functional Groups on the Wide Temperature Operation Performance of LiNi0.8Co0.1Mn0.1O2||SiO/Graphite Pouch Cells

Effect of Additives With Phenyl and Acid Anhydride Functional Groups on the Wide Temperature Operation Performance of LiNi0.8Co0.1Mn0.1O2||SiO/Graphite Pouch Cells

High-nickel LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode paired with silicon-based graphite (SiO/Gr) is pivotal for enhancing the energy density of lithium-ion batteries (LIBs). However, the high reactivity of NCM811 with the electrolyte and the volumetric expansion issues associated with SiO/Gr pose significant challenges to their practical application. To settle these issues, we explore the impact of additives with phenyl and acid anhydride moieties on the performance of NCM811‖SiO/Gr pouch cells across a wide temperature range of −20°C~60°C. Acid anhydride additives are capable of diminishing the internal resistance in NCM811‖SiO/Gr pouch cells, as well as curbing gas evolution and thickness increase during the operational phase. Notably, the batteries enriched with citraconic anhydride (CAn) and succinic anhydride (SAn) additives after 120 cycles at 45°C demonstrated enhanced capacity retention from 83.2% to 88.1% and 85.5%, respectively. Intriguingly, the inclusion of phenyl-containing additives in the electrolyte was found to be advantageous for NCM811‖SiO/Gr pouch cells' low-temperature performance. Furthermore, neither type of functional group significantly enhanced performance at room conditions. Consequently, the combination of additives is necessary to fulfill the stringent requirements of LIBs for extreme environment applications. This work guides designing composite electrolytes for high energy density wide temperature operation LIBs.

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