在P2型阴极中的协同阴离子双相工程:使可逆氧氧氧还原和高能离子电池成为可能
Zhiyuan Li1, Yuqing Sun1, Jiafan Fang1
1School of Chemistry, South China Normal University, Guangzhou 510006, China.
Journal of colloid and interface science
|November 6, 2025
概括
研究人员开发了一种新的P2相阴极材料,用于离子电池 (SIB),使用双Cu/Mg注. 这一策略增强了结构稳定性和可逆的氧氧还原活性,克服了SIB阴极开发中的关键挑战.
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:
- 由于其高容量和离子扩散,P2型层氧化物是离子电池 (SIB) 的有希望的阴极材料.
- 挑战包括不可逆转的相位转换和高电荷状态 (SoC) 的氧气演变.
研究的目的:
- 为SIBs开发稳定的P2相阴极材料,可以抑制有害的相变和氧气损失.
- 提高SIB阴极的结构完整性和电化学性能.
主要方法:
- 对于P2型阴极材料,采用了双重Cu/Mg联合兴奋剂策略.
- 集成了CuO二次阶段的受控形成.
- 使用了理论计算和实验表征 (例如,XRD,电化学测试).
主要成果:
- 开发的Na0.67Mn0.50Cu0.34Mg0.16O2 (NMCM3) 材料显示抑制了雅恩-泰勒扭曲和氧气演变.
- Cu2+ 兴奋剂通过 CuO 相互作用加强了氧结合,而 Mg2+ 增强了 O 2p-Mg 2p 轨道杂交以获得可逆的氧化还原活性.
- 该材料在0.1°C时实现了144.5mAhg-1的高可逆容量,在50个循环中保持了91%的容量,在完整的电池中达到232.77Whkg-1的能量密度.
结论:
- 阴离子双相协调策略有效地解决了P2型阴极中的结构稳定性和氧氧还原可逆性.
- 这种方法为SIBs开发高能量密度阴极材料提供了可行的途径.
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