期刊
NATURE ENERGY
卷 5, 期 11, 页码 860-869出版社
NATURE RESEARCH
DOI: 10.1038/s41560-020-00693-6
关键词
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资金
- National Research Foundation of Korea (NRF) - Korea government Ministry of Education and Science Technology (MEST) [NRF-2018R1A2B3008794]
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning - Ministry of Trade, Industry and Energy of the Korean government [20184010201720]
- National Research Foundation of Korea [5199990414694] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The demand for energy sources with high energy densities continues to push the limits of Ni-rich layered oxides, which are currently the most promising cathode materials in automobile batteries. Although most current research is focused on extending battery life using Ni-rich layered cathodes, long-term cycling stability using a full cell is yet to be demonstrated. Here, we introduce Li[Ni0.90Co0.09Ta0.01]O-2, which exhibits 90% capacity retention after 2,000 cycles at full depth of discharge (DOD) and a cathode energy density >850 Wh kg(-1). In contrast, the currently most sought-after Li[Ni0.90Co0.09Al0.01]O-2 cathode loses similar to 40% of its initial capacity within 500 cycles at full DOD. Cycling stability is achieved by radially aligned primary particles with [003] crystallographic texture that effectively dissipate the internal strain occurring in the deeply charged state, while the substitution of Ni3+ with higher valence ions induces ordered occupation of Ni ions in the Li slab and stabilizes the delithiated structure.
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