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在高性能水性离子电池的 δ-MnO2阴极中,质子间隔诱导的键网络
Yuhui Xu1, Gaini Zhang1, Xiaoxue Wang1
1Shaanxi International Joint Research Center of Surface Technology for Energy Storage Materials, Institute of Advanced Electrochemical Energy & School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, Shaanxi, China.
质子间隙增强了水性离子电池 (AZIB) 的birnessite型二氧化 (δ-MnO2). 这一策略提高了结构稳定性和离子动力学,从而实现了高容量和长周期寿命.
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:
- 伯尼西特类型的二氧化 (δ-MnO2) 对水性离子电池 (AZIB) 显示出前景.
- 结构不稳定性和缓慢反应动力学限制了AZIBs中的δ-MnO性能.
- 开发稳定高效的阴极材料对于推进AZIB技术至关重要.
研究的目的:
- 为AZIBs增强 δ-MnO2的结构稳定性和电化学动力学.
- 为了研究质子介质对δ-MnO2的特性的影响.
- 探索一种用于改善AZIB中的正极材料的新策略.
主要方法:
- 质子间隔策略来修改 δ-MnO.
- 密度函数理论 (DFT) 的计算.
- 电化学石英晶体微平衡 (EQCM) 和现场表征.
主要成果:
- 质子间隙形成OH和H键网络,通过Grotthuss机制增强结构稳定性和质子扩散.
- 质子引入产生氧气空缺,加速离子运输,并改善电子导电性.
- 质子间 δ-MnO (H-MnO2-x) 在超过1000个周期的0.1 A/g下达到401.7 mAh/g,并抑制了不良的硫酸形成.
结论:
- 质子间歇是一种有效的策略,可以改善AZIBs中的δ-MnO2性能.
- 经过修改的H-MnO2-x表现出优越的容量,循环稳定性和速度能力.
- 这种方法为AZIBs开发先进的阴极材料提供了一个有希望的途径.
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