阴极
材料科学
离子
结构稳定性
价(化学)
氧化物
过渡金属
空位缺陷
锂(药物)
纳米技术
化学工程
结晶学
化学
物理化学
冶金
内分泌学
催化作用
工程类
医学
有机化学
结构工程
生物化学
作者
Xiaoxia Yang,Suning Wang,Hang Li,Jiali Peng,Wen‐Jing Zeng,Hsiu‐Ming Tsai,Sung‐Fu Hung,Sylvio Indris,Fujun Li,Weibo Hua
出处
期刊:ACS Nano
[American Chemical Society]
日期:2023-09-15
卷期号:17 (18): 18616-18628
被引量:5
标识
DOI:10.1021/acsnano.3c07625
摘要
P2-type layered transition-metal (TM) oxides, NaxTMO2, are highly promising as cathode materials for sodium-ion batteries (SIBs) due to their excellent rate capability and affordability. However, P2-type NaxTMO2 is afflicted by issues such as Na+/vacancy ordering and multiple phase transitions during Na-extraction/insertion, leading to staircase-like voltage profiles. In this study, we employ a combination of high Na content and Li dual-site substitution strategies to enhance the structural stability of a P2-type layered oxide (Na0.80Li0.024[Li0.065Ni0.22Mn0.66]O2). The experimental results reveal that these approaches facilitate the oxidation of Mn ions to a higher valence state, thereby affecting the local environment of both TM and Na ions. The resulting modification in the local structure significantly improves the Na-ion storage capabilities as required for cathode materials in SIBs. Furthermore, it induces a solid-solution reaction and enables nearly zero-strain operation (ΔV = 0.7%) in the Na0.80Li0.024[Li0.065Ni0.22Mn0.66]O2 cathode during cycling. The assembled full cells demonstrate an exceptional rate performance, with a retention rate of 87% at 10 C compared to that of 0.1 C, as well as an ultrastable cycling capability, maintaining a capacity retention of 73% at 2 C after 1000 cycles. These findings offer valuable insights into the electronic and structural chemistry of ultrastable cathode materials with "zero-strain" Na-ion storage.
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