洞察到电极架构和离子运输在多晶V2O5阴极的固态电池
Zhenjiang Yu1, Hongmei Shan2, Yunlei Zhong3
1Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau SAR, 999078, China.
Small (Weinheim an der Bergstrasse, Germany)
|June 28, 2023
概括
这项研究引入了一种新的无氧化 (V2O5) 阴极,用于聚合物基固态电池 (SSB). 微结构工程增强了离子运输,使这些先进的能量存储设备具有高能量密度和稳定的性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 基于聚合物的固态电池 (SSB) 通过避免接口问题,比硫化物/氧化物类型提供优势.
- 然而,聚合物电解质的低氧化潜力限制了像NCM这样的高压阴极的使用.
- 这就需要开发与聚合物SSEs兼容的替代阴极材料.
研究的目的:
- 报告一种无V2O5阴极,用于高能量密度聚合物基SSB.
- 为了研究V2O5阴极的化学机械行为和电化学性能.
- 展示微结构工程在SSB中离子运输的好处.
主要方法:
- 用于结构检查和化学机械分析的X射线计算机断层扫描 (X-CT).
- 差异容量分析和静电间歇定位技术 (GITT) 用于动力学研究.
- 使用工程V2O5阴极制造的聚氧乙烯 (PEO) 基SSB的制造和测试.
主要成果:
- 微结构的V2O5阴极表现出增强的离子运输通道.
- 与液态电池相比,观察到电化学偏振较小,离子扩散率更快.
- 在60°C的1°C下100个循环后,实现了~91.7%的容量保留的优越循环稳定性.
结论:
- 微结构工程对于设计高性能无正极用于聚合物基SSB至关重要.
- 开发的V2O5阴极是高能量密度聚合物SSB的有希望的候选者.
- 这项工作为先进,更安全的固态电池技术铺平了道路.
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