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Research Article | Open Access

Designing polymer composite electrolyte and Si nanosheets electrode for integrated silicon-based solid-state battery

Xianzheng Liu1,§ (), Xintong Wang2,§, Feng Li1, Huaying Qiao1, Lihua Jiang1, Zhiyuan Wan1, Zhigang Wei1, Xiaoming Liu3
Academy of Mechanical Engineering, Shandong Huayu University of Technology, Dezhou 253034, China
School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, China
Scientific Research Office, Yantai Nanshan University, Yantai 265713, China

§ Xianzheng Liu and Xintong Wang contributed equally to this work.

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By designing and fabricating a high-performance composite solid electrolyte and employing a secondary coating process, an integrated silicon-based solid-state lithium battery (Si-SSLB) was constructed. This integrated battery design significantly improves the solid–solid interfacial contact between the electrode and electrolyte, providing more active sites and pathways for ion transfer.

Abstract

Silicon-based solid-state lithium batteries (Si-SSLBs) are of great interest due to their extremely high safety and energy density. However, the low ionic conductivity of solid electrolytes hinders their use in batteries, the volume expansion of the Si anode during Li+ insertion/extraction, and the high interfacial resistance between the solid electrolyte and electrodes. In this study, a composite solid electrolyte (CSE) with excellent ionic conductivity (1.20 × 10−4 S·cm−1) at 60 °C was developed by introducing the plasticizer succinonitrile (SN) and the inorganic solid electrolyte Li1.3Al0.3Ti1.7(PO4)3 (LATP) into poly(vinylidene fluoride)-hexafluoropropylene (PVDF-HFP) matrix. A three-dimensional (3D) face-contact Si/PVHS-L/LFP (PVHS-L: PVDF-HFP/SN/LATP and LFP: LiFePO4) solid-state battery model was constructed by a secondary coating process based on the use of PVHS-L. This approach forms a fully integrated electrode–electrolyte interface, enhancing Li+ transport efficiency compared to conventional mechanically assembled batteries. The integrated device achieves maximum interfacial contact, resulting in superior electrochemical performance. Specifically, the battery integrated with Si anode, PVHS-L CSE and LFP cathode delivers a discharge specific capacity of 122.6 mAh·g−1 after 100 cycles, with a capacity retention rate of 81.5%. This work provides a new strategy to address the challenge of achieving stable and continuous interfacial contact in Si-SSLBs.

Keywords

silicon anodesolid batteriessolid electrolyte interfaceintegrated electrode

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Nano Research
Volume 18 Issue 3,
March 2025
Article number: 94907230
DOI: 10.26599/NR.2025.94907230
Cite this article:
Liu X, Wang X, Li F, et al. Designing polymer composite electrolyte and Si nanosheets electrode for integrated silicon-based solid-state battery. Nano Research, 2025, 18(3): 94907230. https://doi.org/10.26599/NR.2025.94907230
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