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超越LiF:为稳定的金属电池量身定制Li₂O主导的固体电解质间相

Huipeng Zeng¹, Kai Yu¹, Jiawei Li²

¹Department of Materials Science and Engineering, School of Innovation and Entrepreneurship, Southern University of Science and Technology, Shenzhen 518055, People's Republic of China.

|January 11, 2024

概括

研究人员开发了一种新的稀释剂DFEB,用于创建稳定的金属电池 (LMBs) 的氧化主导的固体电解质介相 (SEI). 这种富含Li2O的SEI提高了电池的性能和寿命,克服了基于LiF的传统SEI的局限性.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
储能储能储能储能储能储能

背景情况:

固体电解质相间 (SEI) 组件极大地影响金属电池 (LMB) 的稳定性.
化 (LiF) 是一种常见的SEI成分,但氧化 (Li2O) 提供较低的Li+扩散屏障.
以Li2O为主导的SEI的电化学性能在很大程度上仍未被探索.

研究的目的:

设计一种新型稀释剂,2,3-二乙氧 (DFEB),用于调节溶解结构.
定制一个由Li2O主导的SEI,以提高LMB的稳定性和性能.
调查Li2O丰富的SEI与LiF丰富的SEI相比的电化学优势.

主要方法:

设计的2,3-二乙基 (DFEB) 作为一种溶解稀释剂.
在离子混合电容电解质 (LHCE) 中利用了DFEB,形成了以Li2O为主导的SEI.
评价了在半电池,对称电池和全电池中的SEI特征和电化学性能 (Li saq saq saq saq LFP,Li saq saq saq NCM811,Li saq saq saq S).

主要成果:

基于DFEB的LHCE形成了一个富含无机物,Li2O主导的SEI,与传统的LiF主导的SEI不同.
在具有稳定的电压形状和均沉积的电池中实现高库伦比效率 (99.58%).
证明有效抑制树状石的形成和卓越的循环稳定性 (85%的容量保留在650个循环后LFP).
一个1.5Ah实用的金属袋式电池在250个循环后显示了89%的容量保留,平均CE为99.93%.

结论:

揭示了 Li2O 主导的 SEI 对稳定的 LMB 的电化学优势.
通过solvation结构调制来定制SEI组件的可行性.
强调DFEB是开发高性能和稳定的金属电池的一个有前途的组件.

关键词:

作为一种可溶性化 (cosolventization) 的方法.金属电池是金属电池的一种.氧化的氧化.局部化的高度电解质.固体电解质相间阶段溶解结构是一种溶解结构.

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