首页|Suppression of multistep phase transitions of O3-type cathode for sodium-ion batteries

Suppression of multistep phase transitions of O3-type cathode for sodium-ion batteries

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O3-type layered oxide cathodes have been widely investigated due to their high reversible capacities and sufficient Na+reservoirs.However,such materials usually suffer from complex multistep phase transitions along with drastic volume changes,leading to the unsatisfied cycle performance.Herein,we report a Mg/Ti co-doped O3-type NaNi0.5Mn0.5O2,which can effectively suppress the complex multistep phase transition and realize a solid-solution reaction within a wide voltage range.It is confirmed that,the Mg/Ti co-doping is beneficial to enhance the structural stability and integrity by absorbing micro-strain and distortions.Thus,the as obtained sample delivers an outstanding cyclic performance(82.3％after 200 cycles at 1 C)in the voltage range of 2.0-4.0V,and a high discharge capacity of 86.6 mAh/g after 100 cycles within the wide voltage range(2.0-4.5V),which outperform the existing literatures.This co-doping strategy offers new insights into high performance O3-type cathode for sodium ion batteries.

Sodium ion batteriesMg/Ti co-dopingPhase transitionCyclic performanceHigh voltage performance

Shengyu Zhao、Qinhao Shi、Wuliang Feng、Yang Liu、Xinxin Yang、Xingli Zou、Xionggang Lu、Yufeng Zhao

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Institute for Sustainable Energy & College of Sciences,Shanghai University,Shanghai 200444,China

State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China

国家自然科学基金国家自然科学基金国家自然科学基金Shanghai Science and Technology Commission's" Science and Technology Innovation Action Plan"(2020)Natural Science Foundation in Shanghai

2217907751774251219081422051110400321ZR1424200

2024

10.1016/j.cclet.2023.108606

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(5)
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