Citation: Haotian Zhang, Shengfa Feng, Mufan Cao, Xiong Xiong Liu, Pengcheng Yuan, Yaping Wang, Min Gao, Long Pan, Zhengming Sun. Al₂O₃ coated polyimide porous films enable thin yet strong polymer-in-salt solid-state electrolytes for dendrite-free lithium metal batteries[J]. Chinese Chemical Letters, ;2025, 36(8): 111096. doi: 10.1016/j.cclet.2025.111096 shu

Al₂O₃ coated polyimide porous films enable thin yet strong polymer-in-salt solid-state electrolytes for dendrite-free lithium metal batteries

School of Materials Science and Engineering, Southeast University, Nanjing 211189, China

panlong@seu.edu.cn

zmsun@seu.edu.cn

Received Date: 3 January 2025
Revised Date: 11 March 2025
Accepted Date: 16 March 2025
Available Online: 18 March 2025

Figures(6)

The ineluctable introduction of lithium salt to polymer solid-state electrolytes incurs a compromise between strength, ionic conductivity, and thickness. Here, we propose Al₂O₃-coated polyimide (AO/PI) porous film as a high-strength substrate to support fast-ion-conducting polymer-in-salt (PIS) solid-state electrolytes, aiming to suppress lithium dendrite growth and improve full-cell performance. The Al₂O₃ coating layer not only refines the wettability of polyimide porous film to PIS, but also performs as a high modulus protective layer to suppress the growth of lithium dendrites. The resulting PI/AO@PIS exhibits a small thickness of only 35 µm with an outstanding tensile strength of 11.3 MPa and Young's modulus of 537.6 MPa. In addition, the PI/AO@PIS delivers a high ionic conductivity of 0.1 mS/cm at 25 ℃. As a result, the PI/AO@PIS enables symmetric Li cells to achieve exceptional cyclability for over 1000 h at 0.1 mA/cm² without noticeable lithium dendrite formation. Moreover, the PI/AO@PIS-based LiFePO₄Li full cells demonstrate outstanding rate performance (125.7 mAh/g at 5 C) and impressive cycling stability (96.1% capacity retention at 1 C after 200 cycles). This work highlights the efficacy of enhancing the mechanical properties of polymer matrices and extending cell performance through the incorporation of a dense inorganic interface layer.
- Polymer-in-salt solid-state electrolytes,
- Inorganic interface layer,
- Al₂O₃ interfacial layer,
- Li dendrites,
- Cycling performance
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沈阳化工大学材料科学与工程学院沈阳 110142

Al2O3 coated polyimide porous films enable thin yet strong polymer-in-salt solid-state electrolytes for dendrite-free lithium metal batteries

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通讯作者: 陈斌, bchen63@163.com

Al₂O₃ coated polyimide porous films enable thin yet strong polymer-in-salt solid-state electrolytes for dendrite-free lithium metal batteries