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2025-8-19：祝贺21级博士研究生陈轩锋研究论文在Advanced Functional Materials (IF 18.5)发表！

发布时间：2025-08-18

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Reinforced Anti-Oxidative Degradation and Interface Stabilization in Bimetal Oxide Filler-based PEO Electrolytes for Lithium Metal Battery

Xuanfeng Chen¹, Zhaoyue Wang¹, Mingjiang Si¹, Ziang Jiang¹, Mengting Liu^2, *, Xianwen Wu^3, *, Feixiang Wu^1, *

* Corresponding Authors:

Mengting Liu (mengtingliu@xjtu.edu.cn), Xianwen Wu (wxwcsu2011@jsu.edu.cn), Feixiang Wu (feixiang.wu@csu.edu.cn);

Abstract

Polyethylene oxide (PEO) electrolytes hold significant potential for the next-generation all-solid-state lithium metal batteries. However, their practical application is limited by low ionic conductivity, unstable solid electrolyte interphase (SEI) and, especially, poor oxidative stability under high voltage. Herein, a filler-modified PEO is proposed to address these challenges. The filler, TIO (SnO₂ doped with In₂O₃), is rich in oxygen vacancies, acting as Lewis acids to interact with TFSI^-, which releases more Li⁺ and achieves a higher ionic conductivity and Li⁺ transference number. Moreover, Sn⁴⁺/In³⁺ in the TIO can form alloy phases with lithium metal to facilitate Li⁺ deposition and transport across the SEI. Consequently, Li//LiFePO₄ cell using the filler-modified PEO exhibit a reversible capacity of ~140 mAh g^-1 and excellent capacity retention of 92% over 800 cycles at 0.2 C. Importantly, the TIO interacts with hydroxy groups and H atom on α-C in PEO, reducing PEO's reactivity and extending its decomposition potential to 4.75 V. Owing to the inhibited oxidative decomposition upon high-voltage cycling, the filler-modified PEO enables Li//LiNi_0.8Co_0.1Mn_0.1O₂ cell to achieve an outstanding initial capacity of 170 mAh g^-1 and maintain 70% capacity retention over 200 cycles at 0.5 C at a high cut-off voltage of 4.3 V.