增强LiNi0.95Mg0.05O2阴极材料的表面稳定性,通过梯度共降合成
Shan Wang1, Bo Wang2, Tian Rao1
1School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
ACS applied materials & interfaces
|December 22, 2025
概括
一种新的渐变修饰阴极材料 (G-LNMO) 显示了离子电池的性能改善. 它的独特结构增强了稳定性和容量,使其成为先进能源存储的有希望的替代方案.
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:
- 高层氧化物对于离子电池阴极至关重要.
- 实现高能量密度,同时保持结构稳定仍然是一个挑战.
研究的目的:
- 为了合成和评估一个渐变修饰的LiNi0.95Mg0.05O2 (G-LNMO) 阴极.
- 将其电化学性能与传统的LiNi0.95Mg0.05O2 (LNMO) 阴极进行比较.
主要方法:
- 共同沉合成用于准备LNMO和G-LNMO阴极材料.
- 通过充放电循环和速率能力测试来评估电化学性能.
主要成果:
- 从核心到表面,G-LNMO表现出渐变结构,含量下降,含量增加.
- 与LNMO相比,G-LNMO显示出更高的结晶性和更有序的分层结构.
- G-LNMO提供了更高的初始放电容量 (216.4 mAh g-1 vs 197.1 mAh g-1 在0.1C) 和更好的速率能力 (196.8 mAh g-1 vs 183.1 mAh g-1 在1C).
- 经过100个循环后,G-LNMO保持了88.6%的容量,显著超过LNMO (68.2%).
结论:
- 梯度修改增强了阴极的结构完整性和电化学性能.
- 兴奋剂提供双重结构支,缓解裂形成并改善框架稳定性.
- G-LNMO是一种非常有前途的阴极材料,用于下一代离子电池.
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