通过在NASICON Na4MnCr(PO4) 3阴极中进行离子注,提高离子电池的性能
Qing Zhu1, Jinxin Wu1, Wenhao Li1
1Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, PR China.
Journal of colloid and interface science
|February 24, 2024
概括
在离子电池阴极中使用化物兴奋剂通过提高动力学和稳定性来提高性能. 这一战略为开发先进的储能材料提供了一个有前途的途径.
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) 对大规模储能充满希望.
- Na$_{4}$MnCr(PO$_{4}$) $_{3}$ (NMCP) 由于其三电子转移,具有高能量密度,但电导性和稳定性较差.
- 扩散动力学和结构完整性的局限性阻碍了SIB的实际应用.
研究的目的:
- 为了提高SIBs的NMCP阴极材料的电化学性能.
- 为了研究酸盐组中选择性氧为离子替代的效果.
- 探索阴离子兴奋剂作为改进纳西康结构阴极材料的战略.
主要方法:
- 通过选择性离子替换合成化物合NMCP (NMCPC) 阴极材料.
- 描述NMCPC的结构和电化学特性.
- 在SIB半电池和NMCPC半硬碳全电池中测试NMCPC阴极性能.
主要成果:
- 化物兴奋剂扩大了单元细胞,创造了Na空缺,并削弱了Na-O键,改善了Na$^{+}$扩散.
- 在50mA/g时,NMCPC-15/C阴极提供了128.0mAh/g的高容量,在1000mA/g时保持了73.0mAh/g.
- NMCPC-15/C表现出优越的循环稳定性,在1000mA/g的500个循环后,容量保持率为60.7%,而NMCP/C的37.1%.
结论:
- 选择性离子兴奋剂显著提高了SIBs的NMCP阴极的电化学性能.
- 性能提升归因于的加入引起的结构变化.
- 这项工作突出了离子兴奋剂策略的潜力,用于为SIBs开发高性能NASICON基阴极材料.
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