在全聚合体固体电解质中以宏观方式排序的压力电位,以响应阳极的体积变化,以抑制树突
Shuang-Feng Li1, Min Zuo1, Jia-Ming Wang1
1Guangdong Provincial Key Laboratory of New Energy Materials Service Safety, Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|October 13, 2025
概括
设计的压电聚合物纳米纤维可以创建定向电场来引导沉积,防止固态电池中的树生长,并提高稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 聚合物科学 聚合物科学
背景情况:
- 固态聚合物电解质 (SPEs) 提高了金属电池的安全性,但由于阳极体积的变化而与树突石的形成作斗争.
- 树突是下一代电池的主要安全性和性能问题.
研究的目的:
- 开发一种新的策略,以抑制固态电池中的树生长.
- 研究由压电聚合物产生的定向电场在控制沉积中的作用.
主要方法:
- 制造具有对齐双极的压电聚乙烯-协同三乙烯 (P) [P (VDF-TrFE) ]纳米纤维接口.
- 产生的电场的特征及其对Li+迁移和沉积的影响.
- 对称Li电池和LiNi0.8Co0.1Mn0.1O2 (NCM811)//Li全电池的稳定性和循环性能的测试.
主要成果:
- 压电P ((VDF-TrFE) 间相产生了一个定向电场,引导Li+从树尖端沉积到平面区域.
- 实现了高离子导电性 (5.0 × 10-4 S cm-1) 和 Li+ 转移数 (0.40).
- 对称Li细胞表现出3000小时的稳定性,全细胞在400个循环后保持96%的容量. 逆转场方向可以使这些改进无效.
结论:
- 在聚合物界面中以定向工程设计的压电场对于有效的树抑制至关重要.
- 这种方法为提高金属固态电池的安全性和性能提供了新的途径.
- 该研究强调了控制电池应用中的压电场方向的重要性.
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