Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 34, Pages 28719-28725Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b10519
Keywords
sodium-ion batteries; nickel-based layered oxides; mixed phases; phase transition; cathode materials
Funding
- Recruitment Program of Global Youth Experts, National Natural Science Foundation of China [51304248]
- Innovation Program of Central South University [2016CXS003]
- State Key Laboratory of Powder Metallurgy at Central South University
- Hunan Shenghua Technology Co., Ltd.
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A class of Ni-based layered NaxNi0.5Mn0.3Co0.2O2 oxide composites is prepared via a solid-state process. Mixed P-, O-, and P-/O-type phases can be obtained by tuning the Na content and annealing temperature, as demonstrated by structural and chemical characterization. Among these materials, the triphase P2/P'3/O'3-type composite exhibits the best overall electrochemical performance. Specifically, this triphase composite delivers a high specific capacity of 126 mA h g(-1) in the potential range of 1.5-4.2 V, high rate capability (similar to 72% of its initial capacity at a rate of 5 C), and good capacity retention after 100 cycles at 0.5 C. The structural transition mechanism for each phase upon electrochemical cycling is investigated, providing insights into the correlation between electrochemical properties and the crystal structure of Ni-rich layered NaxNi0.5Mn0.3Co0.2O2 oxide composites.
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