定联体电子使强大的金属-氧协调向4.5V O3型离子电池阴极实现
Ao Zeng1, Na Li2, Hong Zhang1
1College of Materials Science and Opto-electronic Technology, Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
Angewandte Chemie (International ed. in English)
|September 8, 2025
概括
研究人员开发了一种"结联体电子"策略,以稳定高压离子电池. 这种方法可以防止结构降解,使下一代电池能获得更高的能量密度和更长的循环寿命.
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:
- 在离子电池 (SIB) 中,高压运行对于实现高能量密度至关重要.
- O3 型层氧化物是有前途的 SIB 阴极材料,但高压操作会导致结构性降解.
- 这种降解与氧氧还原活性有关,这种机制尚未完全理解.
研究的目的:
- 为了确定高压O3型SIB阴极结构不稳定的来源.
- 提出一种新的策略,以减轻降解和提高电化学性能.
- 为了实现超高压和高能量密度SIB阴极.
主要方法:
- 使用O3型NaNi1/3Fe1/3Mn1/3O2 (NFM) 作为一个模型系统.
- 研究了氧氧还氧化活性和阴离子迁移之间的关系.
- 开发并应用了一个多层次的选协议,用于"结联体电子" (ALE) 策略.
主要成果:
- 确定了 σ 型氧氧还原和阴离子迁移之间的有害反循环是不稳定的原因.
- ALE策略成功地将氧氧还氧化物限制在稳定的π型配置中.
- ALE设计的NFM阴极在300个循环后在4.5V保持了记录容量.
结论:
- ALE策略有效地抑制有害的氧联体电子转移和金属氧脱协调.
- 通过稳定的π型氧氧还原和强大的金属氧协调,可以实现卓越的循环稳定性.
- ALE战略为优化超高压,高能量密度SIB阴极提供了一条新的途径.
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