捕获O22•‒中间体,以促进高实际容量的Li-O2电池的氧降解反应途径
Danzheng Zhou1, Silei Chen1, Yunpeng Guo2
1National & Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology, School of Materials Science and Engineering, Key Lab for Special Functional Materials of Ministry of Education, Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng, PR China.
使用Py-TFSI在氧电池中捕获超氧化物中间体可以提高氧降解反应速率和稳定性. 这种方法显著提高了电池循环性能和能量密度.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
背景情况:
- 氧 (Li-O2) 电池具有较高的理论能量密度.
- 氧减少反应 (ORR) 的两电子转移路径对于Li-O2电池的性能至关重要.
研究的目的:
- 调查捕获ORR超氧化物 (O2•−) 中间体对Li-O2电池性能的影响.
- 为了提高ORR速率和稳定性,使用pyrrolidinium bis{(trifluoromethanesulfonyl) imide (Py-TFSI).
主要方法:
- 使用Py-TFSI将O2•−中间体从催化剂表面结合并转移到电解质.
- 分析Py+离子和O2•−之间的协调化学.
- 研究对沉积和固体电解质间相 (SEI) 形成的影响.
主要成果:
- 在ORR活动中增加了五倍以上.
- 通过抑制LiO2生成和不成比例,提高了ORR稳定性.
- 由于的均沉积,提高了金属循环稳定性 (增加了2.5倍).
- 实现了47天的循环寿命,具有5 mAh cm-2.2的高面积容量.
结论:
- 捕获O2•−中间体是一种有效的策略,可以改善ORR动力学和稳定性在Li-O2电池.
- 在Py-TFSI方面,它展示了推动金属氧电池技术发展的巨大潜力.
- 这项工作为ORR的中间操纵机制提供了更深入的理解.
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