介电填充剂诱导的混合间相使得高面积容量的坚固的固态金属电池成为可能
Xufei An1, Yang Liu1, Ke Yang1
1Shenzhen All-Solid-State Lithium Battery Electrolyte Engineering Research Center, Institute of Materials Research (IMR), Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|December 17, 2023
概括
研究人员开发了一种新的介电填充剂,酸 (NaNbO3),用于固态电池. 这种填充剂增强了离子导电性,并形成了稳定的接口,防止了更安全,高性能电池的树生长.
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
- 固态电池 固态电池是什么
背景情况:
- 复合固态电解质经常与界面稳定性和树状石的形成作斗争.
- 电流填充器主要增强离子导电,但对固体电解质介相 (SEI) 提供有限的控制.
研究的目的:
- 引入一种新的介电填充剂,酸 (NaNbO3),用于基于聚乙烯化物 (PVDF) 的聚合物电解质.
- 调查NaNbO3在调节SEI和增强固态金属电池接口属性的作用.
主要方法:
- 在基于PVDF的聚合物电解质中加入介电体NaNbO3作为填充剂.
- Li/Li对称电池和LiNi0.8Mn0.1Co0.1O2/Li固态电池的电化学循环.
- 分析SEI的组成和特性,包括模和Li+运输.
主要成果:
- NaNbO3促进了化Li/Na混合SEI的形成,具有高的Young模量,促进了界面Li+运输.
- 介电填充剂在PVDF中诱导了高介电β相,增强了盐解离.
- /对称细胞在3 mA cm-2.2时表现出超过600小时的无树突循环.
- 固态电池表现出稳定的循环性能 (2200 循环在 2 摄氏度) 和高负荷阴极的低温性能优异.
结论:
- 介电NaNbO3是一种有效的填充剂,用于复合固态电解质的接口工程.
- 这种方法可以开发出安全稳定的固态金属电池,其面积容量很大,循环寿命更长.
- 该研究提出了一种用于填充器的新设计原则,以解决下一代电池的接口挑战.
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