硼
材料科学
兴奋剂
阴极
溶解
石墨
微观结构
电化学
锰
化学工程
析氧
电极
分析化学(期刊)
复合材料
冶金
化学
光电子学
工程类
物理化学
有机化学
色谱法
作者
Zhimin Ren,Guohua Li,Xiangtao Bai,Wei Hu,Xiaoyan Li,Haocheng He,Zenghua Chang,Yang Liu,Zhenyao Wang,Zhan-Shuo Liang,Lihao Guo,Zhenxing Gao,Jiantao Wang
标识
DOI:10.1016/j.electacta.2023.142630
摘要
The commercial application of Li-rich Mn-based layered oxides (LLOs) is hindered due to their instability of lattice oxygen and dissolution of manganese. Herein, an effective and large-scale production co-precipitation boron-doping strategy was proposed to improve the performance of Li1.15Mn0.53Ni0.22Co0.1O2. We found that the boron introduced in the co-precipitation process will be uniformly distributed in the bulk and the resulting boron-doped Li1.15Mn0.53Ni0.22Co0.1O2 shows excellent electrochemical properties with low doping amount. Multi-dimensional analysis shows that boron doping significantly improves the structural stability of materials. After 1200 cycles at 1C, boron-doped sample can deliver 147 mAhg−1 with an excellent retention of 80.1%, which is much higher than that of the pristine sample of 44% after 700 cycles. Moreover, the discharge voltage decay of the boron-doped samples is only 0.54 mV per cycle (1.39 mV for pristine). It is worth mentioning that the pouch-cell full battery cycle performance of doped samples is also excellent. The doped cathode//graphite shows a superior capacity retention of 83.6% after 500 cycles without gas generation, while the pristine//graphite only hold the 46.6% of initial capacity. The dQ/dV curves and the SEM/EDS of electrode analysis verified higher reversibility of lattice oxygen, less manganese dissolution and more stable microstructure, which greatly improved the cycling life after boron doping.
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