提高NCM811在以基电解质的高压4.5V的循环稳定性
Yaqi Chen1, Dongyu Liu2, Xieyu Xu1
1State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, 28 Xianning West Road, Xi'an, 710049, China.
Small methods
|December 5, 2024
概括
在电解质中添加二氧化硫酸盐 (LiDFOB),可以提高富含的,,,氧化 (NCM811) 阴极在高电压下的循环稳定性. 这提高了用于先进能源应用的电池性能.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 富含的分层阴极材料,如LiNi0.8Mn0.1Co0.1O2 (NCM811),具有高能量密度,但在高电压下循环稳定性不佳.
- 结构不稳定性和接口降解是阻碍NCM811在高切断电压下性能的主要限制.
研究的目的:
- 调查NCM811在4.5V的高切断电压下发生的结构和界面变化.
- 评估二二氧化 (LiDFOB) 作为提高NCM811稳定性的电解质添加剂的有效性.
主要方法:
- 使用基于LiPF6的电解质对NCM811 धूपLi电池进行电化学测试,无论是否含有LiDFOB添加剂.
- 使用先进的表征技术分析结构和界面变化 (摘要中未指明的细节).
主要成果:
- 在4.5V时LiPF6的优先分解会导致惰性接口,但会导致异型晶格膨胀/收缩,产生裂和快速的NCM811降解.
- 添加LiDFOB显著减轻了这些有害的结构和界面影响.
- 采用LiDFOB的NCM811水Li电池在1C下400个循环后实现了214mAhg-1的初始容量和83.6%的容量保留.
结论:
- LiDFOB是一种有效的电解质添加剂,可提高NCM811阴极的高压循环稳定性.
- 该研究表明,在高端能源应用中,在高切断电压下改善NCM811性能的可行策略.
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