多元组件相位工程策略调节化反应能量阻碍合金阳极的稳定储存
Feiyue Wang1, Hanwen Cheng1, Jingke Ren1
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|February 5, 2025
概括
六角化 (h-BN) 用于为离子电池制造稳定的红色-阳极. 这种新型复合材料表现出卓越的循环稳定性和速度性能,改进了储能解决方案.
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:
- 红色 (RP) 是离子电池的一个有前途的阳极材料,因为它具有很高的理论容量和低成本.
- 然而,RP在循环过程中遭受了显著的体积膨胀和较差的电导率.
- - (P-Se) 合金提供了更好的导电性,但与组件之间的化学亲和力较弱而斗争,阻碍了稳定的复合材料的形成.
研究的目的:
- 为离子电池开发一种稳定,高性能的阳极材料.
- 为了应对红色阳极体积膨胀和导电性差的挑战.
- 调查六角化 (h-BN) 作为P-Se复合材料中的桥梁剂的作用.
主要方法:
- 使用红色,和六角化 (h-BN) 制造多组件阳极.
- 电化学表征,包括初始库伦比效率,循环稳定性和速率性能测试.
- 使用计算方法分析界面电荷转移,固体电解质界相 (SEI) 形成和反应动力学.
主要成果:
- 优化的h-BN桥接RP-Se阳极实现了73.0%的高初始库伦比效率.
- 在1Ag-1.1下,以3000个周期表现出极好的循环稳定性.
- 展现出出色的速率性能,在2 A g-1.1时保持157.3 mAh g-1的排放特定容量.
- 已经证明h-BN的引入可以减少电荷转移和K+传输在SEI中的激活能量,并降低化反应的吉布斯自由能量.
结论:
- 六角化有效地促进了合金阳极中红色和相的紧密合.
- 经h-BN修改的复合材料显著提高了电化学性能,包括初始库伦比效率,循环稳定性和速率能力.
- 这种方法为设计用于高容量二次电池的先进合金电极提供了可行的策略.
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