调节表面阴离子氧化解化学,以实现高度稳定的丰富的阴极,氧气损失微不足道
Hualong Wu1, Jiahao Dong1, Jiantao Li2
1State Key Laboratory of Physical Chemistry of Solid Surface, Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, College of Materials, Xiamen University, Xiamen 361005, China.
ACS nano
|April 17, 2025
概括
这项研究开发了一种用于高容量丰富的分层氧化物阴极的双重还原气处理,增强稳定性并防止氧气损失以延长电池寿命.
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:
- 高容量丰富的层氧化物 (LLOs) 由于不可逆转的氧释放和不稳定的接口而受到初始库伦比效率和容量色的阻碍.
- 这种不稳定性,特别是在初始周期,限制了先进电池LLOs的商业可行性.
研究的目的:
- 开发一种策略来调节LLOs的晶格氧氧氧还原活性和可逆性.
- 为了提高高能量密度电池LLO阴极的结构稳定性和电化学性能.
主要方法:
- 采用了一种双减速气体接口联合处理策略.
- 该战略涉及设计一个多重缺陷结构 (Li/O/TM空缺,TM兴奋剂) 和一个全表面保护层.
- 引入了可逆SO2-SO4氧化还原对来补偿容量并稳定结构.
主要成果:
- 处理有效地抑制了不可逆转的过渡金属迁移和不必要的相变,抵抗电解质腐蚀.
- 在初始周期中,氧气损失微不足道,从而优化了晶格氧氧氧氧氧还原化学.
- 设计的AS-LLO阴极表现出优异的结构稳定性,在0.3C的100个循环后保持99.2%的容量,在5C的1000个循环后保持82.4%.
结论:
- 双减速气体接口联合处理策略显著提高了丰富的层状氧化物阴极的循环稳定性和寿命.
- 优化氧氧还氧化化学和提高结构完整性对于实现高能量密度和长寿命的电池至关重要.
- 这项工作为开发用于下一代能源存储的先进阴极材料提供了有希望的指导方针.
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