化溶剂通过削弱Li+离子和PEO链相互作用来增强室温固态电池的性能
Qingqing Zhou1, Chuyang Li1, Bin Wang1
1College of Materials Science and Engineering, Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, Jiangsu, China.
Journal of colloid and interface science
|March 19, 2025
概括
这项研究改进了基于聚乙烯氧化物 (PEO) 的固态电池,使用乙烯碳酸盐 (FEC) 来提高离子导电性和稳定性. 新的电解质抑制了树突,使电池寿命更长,性能更好.
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) 的固态电池提供了诸如可扩展性和金属兼容性等优势.
- 由于强烈的PEO-离子相互作用,低室温离子导电性阻碍了实际应用.
研究的目的:
- 为了提高基于PEO的固态电解质的离子导电性和稳定性.
- 研究乙烯碳酸盐 (FEC) 作为辅溶剂对溶解结构和电池性能的影响.
主要方法:
- 开发了一种PEO-PAN双矩阵聚合物电解质,其中FEC作为辅溶剂.
- 集成的LATP纳米粒子填充剂可降低PEO结晶度.
- 分析了溶解结构和固体电解质相间形成.
主要成果:
- 在PEO-PAN-LATP-LiTFSI-5% FEC复合物固体聚合物中达到1 × 10−4 S cm−1的环境离子导电性.
- 经过450个小时的稳定循环运行,在一个Lithium H2O Li对称电池中.
- 在0.2C的300个循环后,LIFIDPPLLF的LIFIDFP全电池提供了137.6 mAh/g.
结论:
- FEC辅溶剂有效地减弱了PEO-离子相互作用,创造了有利的溶解结构.
- FEC 增强了 LATP 填充剂的分散,并降低了 PEO 的结晶性.
- 离子衍生的LiF丰富的介相抑制树突,从而提高电池的性能和稳定性.
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