期刊
ENERGY STORAGE MATERIALS
卷 25, 期 -, 页码 76-85出版社
ELSEVIER
DOI: 10.1016/j.ensm.2019.10.029
关键词
Ni-rich engineering; Li-rich layered oxides; Lithium ion battery cathode; Surface modification; Cycling stability
资金
- National Natural Science Foundation of China [51931006, 51701169, 51871188]
- National Key R&D Program of China [2016YFA0202602]
- Natural Science Foundation of Fujian Province of China [2019J06003, 2017J05087]
- Key Projects of Youth Natural Foundation for the Universities of Fujian Province of China [JZ160397]
- Fundamental Research Funds for the Central Universities of China (Xiamen University) [20720190007, 20720190013]
- Double-First Class Foundation of Materials Intelligent Manufacturing Discipline of Xiamen University
Li-rich layered oxide cathode materials (LLOs) are regarded as promising next-generation cathode candidate in high-energy-density lithium ion batteries due to their high specific capacity over 250 mA h g(-1). However, LLOs always suffer from a series of severe issues, such as rapid voltage fading, fast capacity decay and bad cycling stability. In this work, Li1.2Mn0.54Ni0.13Co0.13O2-Li1.2Mn0.44Ni0.32Co0.04O2 (LLO-111@111/811) hybrid layered-layered cathode is constructed via facilely increasing surface Ni content. Profiting from this special design, the prepared LLO-111@111/811 cathode exhibits a remarkable specific capacity of 249 mA h g(-1) with a high capacity retention of 89.3% and a high discharge voltage of 3.57 V with a voltage retention of 83.0% after cycling 350 times a 0.5 C. As a result, the specific energy of LLO-111@111/811 cathode is 887 Wh Kg(-1) at 0.5 C and it keeps as high as 658 Wh Kg(-1) after 350 cycles. LLO-111@111/811 also exhibits an initial high capacity of 169 mA h g(-1) at a high rate of 5 C and maintains a good capacity retention of 90.0% after 200 cycles. This strategy can successfully improve structural stability, suppress capacity decay and restrain voltage fading of LLOs, which is beneficial for their practical application.
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