电荷调节和效应实现稳定的高压分层金属氧化物用于离子电池
Jialin Kuang1, Zhuoming Liu1, Liang Fu2
1Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, P.R. China.
Angewandte Chemie (International ed. in English)
|March 15, 2025
概括
兰兴奋剂通过减少氧气演变和防止结构损伤,提高了用于高压离子电池的多层金属氧化物的稳定性. 这提高了先进电池应用的循环性能和能量密度.
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:
- 高压分层金属氧化物 (LMO) 对于高能离子电池 (SIB) 是至关重要的.
- 在高电压 (>4.0V) 的氧氧还氧反应会导致LMO的不稳定性和容量衰减.
研究的目的:
- 为了提高NaNi1 / 3Fe1 / 3Mn1 / 3O2 (NFM) 的循环稳定性,使用La.
- 在极端条件下调查拉多对氧气演变和结构完整性的影响.
主要方法:
- 拉多被用来修改NFM阴极材料.
- 在高电压和高温下评估电化学性能.
- 通过分析纳米裂纹形成来评估结构稳定性.
主要成果:
- 兴奋剂降低了4.1V的氧气演变,并改善了电荷转移动力学.
- 修改为La的NFM在0.1C时显示出173.4mAhg-1的容量.
- 在1C (2.0-4.2V) 的500个循环后,实现了71.21%的容量保留,优于未经修改的NFM.
- 一个完整的电池表现出高能量密度 (438.78 Wh kg-1),在400个循环中保持70.2%.
结论:
- 这种兴奋剂有效地稳定了SIBs的高压LMOs.
- 拉多的电荷调和效应是提高电化学性能的关键.
- 这一战略对开发先进的高能耗SIB具有重大潜力.
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