单晶丰富阴极的增强结构稳定性使囊细胞的循环能力得到改善
Youqi Chu1,2, Gemeng Liang3, Yongbiao Mu2
1Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China.
ACS nano
|April 4, 2025
概括
和的联合化稳定了单晶LiNi0.9Co0.05Mn0.05O2 (SCNCM90) 阴极材料. 和的联合化稳定了单晶LiNi0.9Co0.05Mn0.05O2 (SCNCM90) 阴极材料. 这种兴奋剂增强了结构完整性,抑制了氧气损失,并改善了下一代电池的循环稳定性.
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:
- 单晶LiNi0.9Co0.05Mn0.05O2 (SCNCM90) 阴极材料由于循环过程中的结构变化和氧气损失而遭受容量降解.
- 这些问题与由氧化还原反应驱动的过渡金属离子迁移有关.
研究的目的:
- 为了提高SCNCM90阴极材料的结构稳定性和电化学性能.
- 为了研究 (Se) 和 (Ti) 同时联合兴奋剂对SCNCM90.0.的影响.
主要方法:
- 同时将Se和Ti纳入SCNCM90晶体结构.
- 电化学循环测试,以评估容量保持和循环寿命.
- 分析结构变化和表面化学.
主要成果:
- Se/Ti联合剂显著改善了结构稳定性,抑制了不可逆转的反应.
- 经过修改的SCNCM90阴极表现出增强的Li+迁移和减少的阴离子混合.
- 在500个循环 (2.8-4.5V,1C) 后,容量保留达到了87.6%,而无兴奋剂材料的容量保持为61.4%.
- 一个袋式电池表现出超过500个循环,只损失了3.1%的容量 (3-4.25V,1C).
结论:
- 同时的Se和Ti共是一种有效的策略,可以提高富含Ni的多层阴极材料的长期稳定性.
- 通过增强的结构稳定性来减轻粒子裂变和氧气释放是提高阴极性能的关键.
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