通过固离子稳定层状酸阴极中的深过程
Tingting Yang1, Qiang Li2, Zhengbo Liu1
1Department of Physics, City University of Hong Kong, Hong Kong, 999077, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|September 20, 2023
概括
将引入富含的多层氧化物中稳定了离子电池 (SIB). 这种阴极材料修改在深度化过程中增强了结构完整性,改善了先进能量存储的容量保留.
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:
- 高能量密度的离子电池 (SIB) 需要具有高特异性容量的先进阴极材料.
- 富含的多层氧化物 (NaxMnO2) 是由于容易的离子间隙/提取而有希望的SIB阴极.
- 这些材料的深度化/脱化会导致晶格相互作用,导致结构降解和容量衰减.
研究的目的:
- 在SIB中深度化/脱循环期间增强富含的氧化物层层的结构稳定性.
- 研究离子兴奋剂对NaxMnO2阴极材料结构和电化学性能的影响.
主要方法:
- 通过将离子引入层层结构,合成添加的富含氧化物Na0.637B0.038MnO2 (B-NMO).
- 描述B-NMO材料以分析其电子结构和MnO八面体变形.
- 在SIB中对B-NMO电极进行电化学测试,以评估其在深度化过程中的容量,循环稳定性和结构转变.
主要成果:
- 引入离子形成了B─O─Mn键,调节电子结构并抑制MnO的八面体变形.
- 在深度化过程中,B-NMO电极表现出温和的结构转变,减轻了有害的晶格相互作用.
- B-NMO电极在1°C时达到141mAh-1g的高容量,并在100个循环后保持81%的容量保留.
结论:
- 将固定在富含的材料上,有效地抑制了SIB深度化过程中有害的结构演变.
- 兴奋剂是一种可行的策略,用于开发高性能离子电池的优质阴极材料.
- 作为先进的离子电池应用中的稳定和高容量的阴极,B-NMO材料显示出显著的潜力.
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