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在高性能离子电池的分层阴极中调节价值电子和Na占用

Lijue Yan¹, Xinyu Li¹, Huilin Pan^1,2

¹Department of Chemistry, Zhejiang University, Hangzhou 310027, China.

ACS applied materials & interfaces

|May 9, 2024

概括

研究人员开发了一种新的正极材料,Na_0.76Ni_0.23Li_0.1Ti_0.02Mn_0.65O_1.998F_0.02 (NLTMOF),用于离子电池 (NIB). 这种材料提高了大规模储能能力和循环稳定性.

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:

离子电池 (NIB) 对大规模储能充满希望,但需要高性能阴极材料.
P2型分层氧化物提供结构稳定性,但在高电压下具有有限的容量和相位过渡.

研究的目的:

为NIB开发一种新的P2型阴极材料,以提高容量和循环稳定性.
研究三元Li/Ti/F替代对P2型氧化物的电子结构和电化学性能的影响.

主要方法:

一种新的P2型阴极材料的合成:Na_0.76Ni_0.23Li_0.1Ti_0.02Mn_0.65O_1.998F_0.02 (NLTMOF) 通过三元Li/Ti/F替代.
电化学表征以评估可逆容量,速率能力和在高电压下循环稳定性.
通过三元兴奋剂诱导的电子结构修改的分析.

主要成果:

在NLTMOF中显示了110.0 mAh g^{-1 的增强可逆容量在2-4.2 V和132.2 mAh g^{-1 在2-4.4 V.}}
三级兴奋剂优化电子导电性和Na提取,防止有害的P2-O2相位过渡.
该材料在长时间内显著改善了循环稳定性.

结论:

三元//替代是一种有效的策略,用于设计NIB的先进阴极材料.
调节电子结构和Na占用率提高了性能,为NIB的商业化铺平了道路.
NLTMOF是高压,稳定的离子能量存储的有前途的阴极材料.

关键词:

离子电池离子电池 P2型阴极是P2类型的阴极.高电压的高电压的高电压三元化Li/Ti/F替换的方法价值电子是一种电子.

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