一个可持续的阳离子氧还原Mn-based阴极的高积工程与阻滞应力,用于高速的离子电池
Shiqi Liu1,2,3, Fangzheng Liu1,2, Shu Zhao1,2
1Institute of Advanced Battery Materials and Devices, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China.
Angewandte Chemie (International ed. in English)
|December 23, 2024
概括
高工程增强了用于离子电池 (SIB) 的基层氧化物阴极. 这一策略改善了结构稳定性和可逆的氧氧还氧反应,提高了电池的性能和寿命.
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:
- 基于的分层氧化物是离子电池 (SIB) 的有希望的阴极材料,因为它们的能量密度高和成本效益高.
- 然而,使用这些阴极的SIB面临诸如不可逆转的氧氧还氧反应,相位过渡和微裂变等挑战,导致性能降低.
- 制定提高结构完整性和电化学稳定性的策略对于推进SIB技术至关重要.
研究的目的:
- 引入P2型Mn基层氧化物阴极 (HE-NMCO) 的高工程策略.
- 调查这种策略对格子框架稳定性,氧氧还氧化活性和离子运输动力学的影响.
- 评估工程HE-NMCO阴极的电化学性能,特别是循环稳定性和速率能力.
主要方法:
- 高工程应用于P2型Mn基层氧化物阴极.
- 多模态表征技术用于分析结构完整性,元素相互作用和氧化还原行为.
- 电化学测试包括深度 (脱) 循环和速率能力测量.
主要成果:
- 高策略 (HE-NMCO) 创建了一个强大的格子框架,具有优化的元素相互作用,减轻压力和防止断裂.
- HE-NMCO证明了可持续的可逆氧活性,并加速了Na+运输动力学.
- 实现了显著的循环稳定性,在100个循环后保留了93.5%的容量,在5C时增强了134.1 mAh g-1的功率.
- 相对研究证实了HE-NMCO中氧离子氧化还原反应 (OAR) 的更高可逆性,与传统的NMCO相比.
结论:
- 高工程是稳定SIB中的基于Mn的分层氧化物阴极的有效策略.
- 这种方法增强了结构完整性,促进了可逆的氧氧还氧反应,并改善了Na+动力学.
- 开发的HE-NMCO阴极显示出在下一代SIB中高能量和功率密度应用的巨大潜力.
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