拉伤
材料科学
离子
钠
接口(物质)
结晶学
化学工程
化学
复合材料
有机化学
工程类
生物
解剖
毛细管数
毛细管作用
冶金
作者
Lei Wang,Jiaqing Wang,Leilei Wang,Hanghang Dong,Chao Yang,Hao Yan,Yao Xiao,Yong Wang,Shulei Chou,Shuangqiang Chen
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-04-13
标识
DOI:10.1021/acsnano.4c00764
摘要
A Na4MnV(PO4)3 (NMVP) cathode is regarded as a promising cathode candidate for sodium-ion batteries (SIBs). However, issues such as low electronic conductivity and partial cation dissolution contribute to high polarization and structure distortion. Herein, we engineered the local electron density and reaction kinetic properties of NMVP cathodes with varying oxygen vacancies by introducing varying amounts of Zr doping and carbon coating. The optimized sample exhibited a high-rate capacity of 71.8 mAh g–1 at 30 C (83.1% capacity retention after 1000 cycles) and excellent performance over a wide temperature range (84.1 mAh g–1 at 60 °C and 61.4 mAh g–1 at −30 °C). In situ X-ray diffraction technology confirmed a redox solid solution and a two-phase reaction mechanism, revealing minor changes in cell volume and slight strain variations after Zr doping, effectively suppressing the structural distortion. Theoretical calculations illustrated that Zr doping largely shrinks the band gap of NMVP, enriches local electron density, and slightly alters the local element distribution and bond lengths. Moreover, full-cells have shown high energy density (259.9 Wh kg–1) and outstanding cycling stability (200 cycles). The work provides fresh insights into the synergistic effect of strain suppressing and interface engineering in promoting the development of wide temperature range and long-calendar-life SIBs.
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