在MnOx中的氧空缺调节水性离子电池的反应动力学
Yuhui Xu1, Gaini Zhang1, Jianhua Zhang1
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, China; Engineering Research Center of Conducting Materials and Composite Technology, Ministry of Education, Xi'an 710048, China.
Journal of colloid and interface science
|August 19, 2023
概括
这项研究通过创建氧气空缺和纳米结构来增强二氧化物 (MnO2) 阴极材料用于水性离子电池 (AZIB). 这提高了导电性和离子扩散,提高了电池的性能和耐用性.
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:
- 二氧化 (MnO2) 阴极材料在水性离子电池 (AZIB) 中面临挑战,原因是导电性差,结构不稳定,离子扩散缓慢.
- 优化MnO2性能对于开发高效且持久的AZIB至关重要.
研究的目的:
- 为了合成一个纳米结构的MnOx阴极材料与工程氧空缺增强AZIB性能.
- 研究氧气空缺和中孔结构在改善电化学性质中的作用.
主要方法:
- 用于合成纳米结构的MnOx阴极材料的酸蚀刻方法.
- 综合性表征包括电化学性能测试和机制分析.
- 使用开发的阴极材料制造和测试AZIB.
主要成果:
- 合成的MnOx材料表现出丰富的Mn(III) 位点和众多的氧气空缺.
- 氧气空缺促进了可逆Zn2+离子吸附/脱附,并改善了电子转移.
- 半孔结构提供了充足的活性点和缩短的离子扩散路径.
- 在0.1 A/g时达到388.7 mAh/g的可逆特异性容量,在3.0 A/g时在2000个周期内保持72.0%的容量保留.
- 提供了639.7 Wh kg-1的最大能量密度.
结论:
- 工程氧气空缺和纳米结构调节是优化AZIBs的MnO2阴极材料的有效策略.
- 开发的MnOx材料显示出用于高性能和耐用AZIB应用的巨大潜力.
- 这项研究为管理在改造的MnO2阴极中储存的机制提供了宝贵的见解.
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