Composite Solid-state Polymer Electrolytes with a Wide Electrochemical Window and Enhanced Mechanical Strength for Lithium-ion Battery Applications

Jing-yu Bao; Cai-mei Yu; Xue Gong; Hong-xu Liu; Shi-jie Ren

doi:10.11777/j.issn1000-3304.2026.25253

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Composite Solid-state Polymer Electrolytes with a Wide Electrochemical Window and Enhanced Mechanical Strength for Lithium-ion Battery Applications

更新时间：2026-03-09

- Composite Solid-state Polymer Electrolytes with a Wide Electrochemical Window and Enhanced Mechanical Strength for Lithium-ion Battery Applications
- Acta Polymerica Sinica Pages: 1-13(2026)
- 作者机构：
  
  1.四川大学高分子科学与工程学院先进高分子材料全国重点实验室成都 610065
  2.天府绛溪实验室成都 641419
- 作者简介：
  
  Hong-xu Liu, E-mail: hongxuliu@scu.edu.cn
  Shi-jie Ren, E-mail: rensj@scu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2026.25253
  CLC：
- CSTR：32057.14.GFZXB.2026.7558
- Received：21 November 2025，
  
  Accepted：23 January 2026，
  
  Online First：08 March 2026，
- 稿件说明：
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鲍镜羽, 于彩梅, 龚雪, 刘洪煦, 任世杰. 具有宽电化学窗口和增强机械强度的复合固态聚合物电解质及其在锂离子电池中的应用. 高分子学报, doi: 10.11777/j.issn1000-3304.2026.25253.

Bao, J. Y., Yu, C. M., Gong, X., Liu, H. X., Ren, S. J. Composite solid-state polymer electrolytes with a wide electrochemical window and enhanced mechanical strength for lithium-ion battery applications. Acta Polymerica Sinica (in Chinese), doi: 10.11777/j.issn1000-3304.2026.25253.
鲍镜羽, 于彩梅, 龚雪, 刘洪煦, 任世杰. 具有宽电化学窗口和增强机械强度的复合固态聚合物电解质及其在锂离子电池中的应用. 高分子学报, doi: 10.11777/j.issn1000-3304.2026.25253. DOI： CSTR： 32057.14.GFZXB.2026.7558.

Bao, J. Y., Yu, C. M., Gong, X., Liu, H. X., Ren, S. J. Composite solid-state polymer electrolytes with a wide electrochemical window and enhanced mechanical strength for lithium-ion battery applications. Acta Polymerica Sinica (in Chinese), doi: 10.11777/j.issn1000-3304.2026.25253. DOI： CSTR： 32057.14.GFZXB.2026.7558.

摘要

基于聚氧化乙烯(PEO)的全固态聚合物电解质与液态电解质相比具有更优异的安全性，成为当前的研究热点. 然而，其较低的离子电导率以及机械强度不足等问题，严重制约了该类材料的实际应用. 针对这一技术瓶颈，本研究采用静电纺丝技术，成功制备了一种新型PEO基含三维复合纤维网络的固态电解质，通过引入超交联聚合物修饰的纳米颗粒，有效构建了稳定、高机械强度的骨架结构，为锂离子传输提供了连续且高效的通道. 实验结果表明，复合电解质PVDF-PEO-SiO

@HCPs-10%展现出卓越的综合性能：具有5.5 V (versus Li/Li⁺)的宽电化学窗口；在40 ℃条件下实现了1.41×10

-4

S·cm

-1

的高离子电导率；机械强度提升至4.01 MPa. 同时基于该电解质组装的LiFePO

//Li电池也表现出优异的电化学性能：LiFePO

/PPH-10%/Li电池在2 C的高倍率充放电条件下，仍能保持147.5 mAh·g

-1

的高比容量，且具备出色的循环稳定性. 本工作突出了超交联纳米颗粒增强纤维电解质在解决基于PEO体系长期存在问题中的有效性. 其设计策略为开发具有更高安全性、更优离子电导率和更强机械性能的新一代固态电解质提供了一条新的路径.

Abstract

Poly(ethylene oxide) (PEO)-based all-solid-state polymer electrolytes have attracted considerable attention as safer alternatives to liquid electrolytes. Nevertheless

their practical applications are severely hindered by the low ionic conductivity and poor mechanical strength. To overcome these limitations

we herein fabricated a novel PEO-based electrolyte with three-dimensional composite fiber-networks

via

electrospinning. By incorporating hypercrosslinked polymer-modified nanoparticles

a mechanically robust framework was established

which simultaneously enhanced structural stability and provided continuous

efficient ion-conduction pathways. As a result

the composite electrolyte

PVDF-PEO-SiO

@HCPs-10%

displayed a wide electrochemical stability window of 5.5 V (versus Li/Li⁺)

a high ionic conductivity of 1.41×10

-4

S·cm

-1

at 40 ℃

and an improved tensile strength of 4.01 MPa. When assembled into LiFePO

//Li cells

the electrolyte enabled excellent electrochemical performance

achieving a high specific capacity of 147.5 mAh·g

-1

at a rate of 2.0 C

along with outstanding cycling stability. This work highlights the effectiveness of hyper-crosslinked nanoparticle-reinforced fiber electrolytes in addressing the long-standing challenges of PEO-based electrolyte systems. The proposed design strategy offers a promising avenue toward the development of next-generation solid-state electro

lytes with superior safety

ionic conductivity

and mechanical robustness.

关键词

Keywords

references

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