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摘要

相比于有机体系锂离子电池, 全固态锂金属电池有望同时提高电池安全性和能量密度, 因而受到广泛的研究和关注. 固态电解质的电化学窗口决定了电解质在高压电池充放电过程中是否保持稳定. 目前的固态电解质, 热力学稳定电化学窗口较窄, 限制了其与高电压正极以及锂金属负极的匹配. 因而能否形成动力学稳定的界面, 决定了全固态电池是否能够持续高效工作. 本文总结归纳了固态电解质的热力学稳定窗口的实验和理论计算研究进展, 并对提高界面稳定性的实验进展进行了简述. 在此基础上, 提出构建动力学稳定性界面及防止锂枝晶的思路, 并展望了全固态电池界面构建的研究方向.

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Abstract

Compared with the lithium-ion battery based on the non-aqueous electrolyte, all-solid-state lithium battery has received much attention and been widely studied due to its superiority in both safety and energy density. The electrochemical window of solid electrolyte determines whether the electrolyte remains stable during the cycling of the high-voltage battery. Current solid electrolytes typically have narrow electrochemical windows, thereby limiting their coupling with high voltage cathodes and lithium metal anode. Therefore, the formation of the stable interphase determines the stabilities of the all-solid-state batteries. Here in this work, both the experimental and theoretical progress of the electrochemical stability window of solid-state electrolytes are summarized. Besides, the experimental achievements in improving the stability of the interphase are also mentioned. On this basis, the strategies of constructing dynamically stable interphase and preventing the lithium dendrite branch crystal from forming are put forward. The future research direction of the interphase construction in all-solid-state batteries is also presented.

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作者及机构信息

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通信作者:王飞,feiw@fudan.edu.cn; 王春生,cswang@umd.edu

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Corresponding author:Wang Fei,feiw@fudan.edu.cn; Wang Chun-Sheng,cswang@umd.edu

文章全文: translate this paragraph

参考文献

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施引文献

下载: 全尺寸图片幻灯片

电解质/SEI	理论计算值/V	实验值/V	测试方法
LiF	0—6.36^[16]	—	—
Li₂S	0—2.01^[17]	—	—
Li₃N	0—0.44^[18]	0—0.9^[19]	Li/液体电解质/Li₃N-C-PTFE
70Li₂S-30P₂S₅	2.28—2.31^[17]	0—5^[20]	Li/LPS/不锈钢
Li₆PS₅Cl	1.71—2.01^[17]	0—7^[21]	Li/LPS/不锈钢
Li₆PS₅Cl	1.71—2.01^[17]	1.25—2.5^[15]	Li-In/ LPSC/LPSC-C
Li₁₀GeP₂S₁₂	1.71—2.14^[17]	0—5^[22]	Li/LGPS/Au
Li₁₀GeP₂S₁₂	1.71—2.14^[17]	1—2.7^[23]	Li/LGPS/LGPS-C/Pt
Li₇La₃Zr₂O₁₂	0.05—2.91^[17]	0—6^[24]	Li/LLZO/Au
Li₇La₃Zr₂O₁₂	0.05—2.91^[17]	0—4^[25]	Li/LLZO/LLZO-C/Pt
Li_1.5Al_0.5Ge_1.5(PO₄)₃	2.7—4.27^[17]	0—6^[26]	Li/LAGP/Pt
LiPON	0.68—2.63^[17]	0—5.5^[27]	Li/LiPON/Pt

下载: 导出CSV

—	LLZO	LPS	Li₂OHCl	LiMn₂O₄	LiFePO₄	石墨	Al	Ge	Si	ZnO
E/GPa	150^[12]	19^[69]	7.8^[70]	100^[71]	124^[72]	27^[73]	69^[73]	80^[73]	107^[73]	135^[73]

下载: 导出CSV

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