Achieving structural stability and enhanced electrochemical performance through Nb-doping into Li- and Mn-rich layered cathode for lithium-ion batteries

被引:11
|
作者
Yun, Soyeong [1 ]
Yu, Junwoo [1 ]
Lee, Wontae [1 ]
Lee, Hayeon [1 ]
Yoon, Won-Sub [1 ,2 ]
机构
[1] Sungkyunkwan Univ, Dept Energy Sci, Suwon 16419, South Korea
[2] Sungkyunkwan Univ, SKKU Inst Energy Sci & Technol SIEST, Suwon 16419, South Korea
基金
新加坡国家研究基金会;
关键词
HOLLOW MICROSPHERES; RATE CAPABILITY; OXIDE CATHODES; VOLTAGE FADE; SURFACE; SUBSTITUTION; ACTIVATION; MORPHOLOGY; MIGRATION; MECHANISM;
D O I
10.1039/d2mh01254e
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Although Li- and Mn-rich layered oxides are attractive cathode materials possessing high energy densities, they have not been commercialized owing to voltage decay, low rate capability, poor capacity retention, and high irreversible capacity in the first cycle. To circumvent these issues, we propose a Li1.2Ni0.13Co0.13Mn0.53Nb0.01O2 (Nb-LNCM) cathode material, wherein Nb doping strengthens the transition metal oxide (TM-O) bond and alleviates the anisotropic lattice distortion while stabilizing the layered structure. During long-term cycling, maintaining a wider LiO6 interslab thickness in Nb-LNCM creates a favorable Li+ diffusion path, which improves the rate capability. Moreover, Nb doping can decrease oxygen loss, suppress the phase transition from layered to spinel and rock-salt structures, and relieve structural degradation. Nb doping results in less capacity contributions of Mn and Co and more reversible Ni and O redox reactions compared to pristine Li1.2Ni0.133Co0.133Mn0.533O2 (LNCM), which significantly mitigates the voltage decay (Delta 0.289 and Delta 0.516 V for Nb-LNCM and LNCM, respectively) and ensures stable capacity retention (82.7 and 70.3% for Nb-LNCM and LNCM, respectively) during the initial 100 cycles. Our study demonstrates that Nb doping is an effective and practical strategy to enhance the structural and electrochemical integrity of Li- and Mn-rich layered oxides. This promotes the development of stable cathode materials for high-energy-density lithium-ion batteries.
引用
收藏
页码:829 / 841
页数:14
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