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对于低压力丰富的阴极进行双重修改,以实现在袋式全细胞中更高的循环性

Youqi Chu^1,2, Shunzhang You¹, Yongbiao Mu²

¹Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China.

|August 19, 2024

概括

这项研究开发了一种用于改进离子电池的新型Sn4+/F-密封和LiF涂层的丰富阴极 (NCM811-SF). 增强的阴极材料表现出卓越的循环和热稳定性,解决了丰富的阴极应用中的关键挑战.

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:

像LiNi0.8Co0.1Mn0.1O2 (NCM811) 这样的丰富的阴极受到容量衰减,接口不稳定性和热失控的影响.
这些问题阻碍了高能量密度离子电池的实际应用和商业化.

研究的目的:

为先进的离子电池开发稳定耐用的富含Ni的正极材料.
通过新的 codoping 和涂层策略来解决传统NCM811的局限性.

主要方法:

结构性制造Sn4+/F-密封和LiF涂层的丰富阴极 (NCM811-SF).
利用COMSOL模拟,X射线衍射和扫描传输电子显微镜进行详细分析.
电化学性能测试,包括循环稳定性和容量保留.

主要成果:

NCM811-SF阴极显著改善了循环和热稳定性.
在300个循环后保持了85.4%的初始容量,并在1°C下表现出169 mAh·g-1的可逆容量.
在500个循环后,NCM811-SF/石墨电池保持了94.8%的容量.

结论:

Sn4+/F-coddoping和LiF涂层有效地提高了丰富的阴极的结构完整性和电化学性能.
开发的NCM811-SF材料对高效率和长寿命的离子电池具有很大的前景.

关键词:

离子电池是一种离子电池.它是LiNi0.8Co0.1Mn0.1O2的组成部分.尼 / 乱乱乱乱乱在Sn4+/F−共中,Sn4+/F−共中,Sn4+/F−共中容量色的消退能力接口的不稳定性.

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