采用Zwitterionic纤维素基聚合物电解质,通过水溶液造实现高性能固态电池的使用
Yong Cheng1, Zhichao Cai1, Jinglei Xu1
1State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Materials, Xiamen University, Xiamen, 361005, China.
Angewandte Chemie (International ed. in English)
|May 7, 2024
概括
兹威特基纤维素纳米纤维增强聚乙烯氧化物固态电解质,改善离子导电性和机械强度,使更安全,高性能电池.
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:
- 基于聚乙烯氧化物 (PEO) 的固态电池提供高能耗和安全性.
- 限制包括较低的离子导电性,较差的Li+转移和较弱的机械性能.
研究的目的:
- 通过结合zwitterionic纤维素纳米纤维 (ZCNF) 来解决PEO电解质限制.
- 为了同时增强离子导电性,Li+转移和机械强度.
主要方法:
- 用水溶液造方法制备填充ZCNF的PEO电解质.
- 描述技术和理论计算,以了解ZCNF的功能.
- 制造和测试LiFePO4 saqPL-ZCNF saqLi固体全电池和袋电池.
主要成果:
- ZCNF破坏了PEO结晶,有助于盐分离,并促进了Li+运输.
- 在60°C时达到5.37×10-4 S/cm的离子导电性和0.62的Li+转移数.
- 证明了高机械强度 (9.2 MPa) 和临界电流密度 (1.1 mA/cm2).
- 全细胞显示出出色的速率能力和循环稳定性 (900个周期在5C).
- 在0.5C和60°C的1000个循环后,囊细胞保持了93.7%的容量.
结论:
- 兹威特的纤维素纳米纤维有效地克服了PEO电解质的限制.
- 开发的PL-ZCNF电解质显示了实用固态电池应用的巨大潜力.
- 同时提高导电性,转移数和机械性能.
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