材料科学
阴极
兴奋剂
溶解
离子
化学工程
钴
氧化物
无机化学
锂(药物)
光电子学
冶金
物理化学
内分泌学
化学
工程类
物理
医学
量子力学
作者
Wenjun Jiang,Chunxiao Zhang,Yuzhang Feng,Bo Wei,Libao Chen,Ruifeng Zhang,Douglas G. Ivey,Peng Wang,Weifeng Wei
标识
DOI:10.1016/j.ensm.2020.07.035
摘要
Lithium-rich layered oxides (LLOs) are regarded as one of the most promising cathode materials for next generation Li-ion batteries (LIBs) due to their high energy density. However, the associated oxygen release and structure collapse resulting from the intrinsic anion and cation redox reactions lead to performance degradation, particularly the characteristic voltage fading which has prohibited the commercialization of LLOs for more than a decade. Herein, we have developed a dual-doping technique to overcome the longstanding structure and voltage instabilities of Co-free Li1.2Mn0.533Ni0.267O2, through the concurrent introduction of neodymium (Nd) and aluminum (Al) ions. Selective atomic substitution of Ni/Mn with Nd/Al ions and the preconstructed heteroepitaxial interface significantly enhance the voltage and capacity retention by regulating Ni ion activity and suppressing the phase transformation and Mn dissolution, thereby improving rate performance through tuning the electronic structure and promoting Li+ migration. The dual-doped material exhibits a superior cycling stability, with over 90% voltage retention and 82% capacity retention after 200 cycles, and excellent rate performance (150 mAh g−1 at 10 C).
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