过渡金属层空缺对P2型分层阴极材料结构和性能的影响
Orynbay Zhanadilov1, Sourav Baiju2, Natalia Voronina1
1Department of Nanotechnology and Advanced Materials Engineering and Sejong Battery Institute, Hybrid Materials Research Center, Sejong University, 98 Gunja-Dong, Gwangjin-Gu, Seoul, 05006, South Korea.
Nano-micro letters
|July 8, 2024
概括
引入---氧化物阴极的空缺增加了结构稳定性和容量. 这种富含空位的材料 (V-NRM) 激活氧氧还氧,提高可持续的离子电池的性能.
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:
- 离子电池 (SIB) 是离子电池的一个有希望的替代品.
- 开发高性能阴极材料对于SIB的发展至关重要.
- 过渡金属氧化物被广泛用于SIB阴极的研究.
研究的目的:
- 研究过渡金属层空缺对Na0.6[Ni0.3Ru0.3Mn0.4]O2 (NRM) 阴极材料的影响.
- 为了提高SIB阴极材料的结构稳定性,操作电压和容量.
- 探索氧氧还氧激活在提高电池性能中的作用.
主要方法:
- 用空位修改的Na0.7[Ni0.2VNi0.1Ru0.3Mn0.4]O2 (V-NRM) 和原始NRM的合成和特征.
- 使用先进的技术:传输电子显微镜 (TEM),X射线吸收近边光谱 (XAS),X射线衍射 (XRD) 和微分电化学质谱 (DEMS).
- 密度函数理论 (DFT) 计算,以验证电子结构和氧氧还原的实验发现.
主要成果:
- 与NRM相比,V-NRM表现出增强的结构稳定性和更高的容量.
- 该材料在100个循环后保持了81%的容量保留.
- 确认了氧氧还氧化激活,有助于提高容量利用率和稳定OP4阶段,而不会释放氧气.
结论:
- 在过渡金属层中引入空缺位置是提高SIB阴极性能的有效策略.
- 该V-NRM材料显示出作为下一代离子电池的高容量,稳定的阴极的潜力.
- 了解氧氧还氧化机制是设计先进的储能材料的关键.
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