Citation: Yucheng Wang, Xiaodan Li, Xunhui Xiong, Yuancheng Chen, Yun Cheng, Jianhao Lin, Chuang Ji, Yingyi Yuan. Ferromagnetic filler-induced stable electrode/electrolyte interfaces for solid-state Li metal batteries[J]. Chinese Chemical Letters, ;2026, 37(9): 111528. doi: 10.1016/j.cclet.2025.111528 shu

Ferromagnetic filler-induced stable electrode/electrolyte interfaces for solid-state Li metal batteries

Yucheng Wang ^a ,
Xiaodan Li ^a ,
Xunhui Xiong ^{a, *,} ,
Yuancheng Chen ^a ,
Yun Cheng ^{b, *,} ,
Jianhao Lin ^a ,
Chuang Ji ^a ,
Yingyi Yuan ^a

a.
School of Environment and Energy, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou 510006, China
b.
Guangdong Saffien New Materials Co., Ltd., Qingyuan 511520, China

esxxiong@scut.edu.cn

chengerr@126.com

Received Date: 12 April 2025
Revised Date: 25 June 2025
Accepted Date: 1 July 2025
Available Online: 2 July 2025

Figures(5)

Solid polymer electrolyte (SPEs) modified by inorganic fillers has become a simple and effective strategy to improve ionic conductivity and mechanical strength. However, the uneven charge distribution at the interface of polymer electrolyte/electrode results in unstable interfaces and poor cycle performances. Herein, ferromagnetic (La_0.60Sr_0.40)_0.95Co_0.20Fe_0.80O_3-δ (LSCF) has been firstly proposed as filler for PVDF-based electrolyte (PLSCF) to address these critical challenges in solid-state Li metal battery. It has been demonstrated that LSCF filler cannot only increase the ratio of amorphous phase in the polymer, but also induce the rearrangement of PVDF molecular chains under an applied external magnetic field during the preparation process, which can facilitate the generation of the β-phase and promote the dissociation of Li⁺. The synthesized PLSCF electrolyte exhibits appealing physicochemical properties, including enhanced ionic conductivity (2.09×10⁻⁴ S/cm), reduced activation energy (0.142 eV), and improved mechanical robustness (1.286 MPa), which can contribute to a homogeneous lithium deposition on Li metal anode. Furthermore, LSCF can establish an even electric field at the PLSCF/cathode interface, which helps to weaken the space charging layer and construct a robust cathode/electrolyte interface (CEI). As a result, both solid-state Li/Li symmetric cells and LiNi_0.6Co_0.2Mn_0.2O₂/Li full cells incorporating the PLSCF electrolyte exhibit significantly improved cycling stability and rate capability. This work enriches inorganic fillers to stabilize electrode/electrolyte interface for high-performance solid-state Li metal batteries.
- Solid-state Li metal batteries,
- PVDF polymer electrolyte,
- Ferromagnetic packing,
- Space charge layer,
- Interfacial electric field
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