首页|Enhanced cyclic stability of partially disordered spinel cathodes through direct fluorination with gaseousfluorine

Enhanced cyclic stability of partially disordered spinel cathodes through direct fluorination with gaseousfluorine

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Spinel-type cathodes are considered an optimal substitute for conventional layered oxide cathodes owing to their use of inexpensive and earth-abundant manganese as the redox-active element.Moreover,the introduction of cation disorder can effectively suppress the detrimental two-phase reaction to realize high capacities in a wide voltage range.However,the continuous capacity decay during cycles has hindered the widespread application of these cathode materials.Inorganic fluorides exhibit excel-lent electrochemical stability at high voltage;therefore,in this study,the direct F2 gas reaction with a partially dis-ordered spinel cathode(Li1.6Mn1.6O3.7F0.3,LMOF1.6)was initially applied to investigate the impacts of fluorination on the surface structure and electrochemical performances.The inorganic fluorinated layer,mainly containing LiF,was distributed uniformly on the surface of LMOF1.6 nanoparticles after fluorination for an appropriate time without the turbulence caused by the valency of manganese cation,which improved the capacity retention and rate capability by the suppression of structural damage,parasitic reaction,and cation dissolution.The LMOF1.6 cathode fluorinated for 0.5 h exhibited a capacity of 283.6 mAh·g-1 at 50 mA·g-1 and an enhanced capacity retention of 29.6％after 50 cycles in the voltage range of 1.5-4.8 V,as compared to the pristine LMOF1.6 with only 27.9％capacity retention.

Spinel-type cathodesDirect fluorinationCapacity retention abilityHigh rate capability

Yong-Nian Ma、Ling-Chen Kong、Shao-Shan Chen、Yong Wang、Li-Dong Sun、Cong Peng、Meng-Meng Qin、Yu Li、Wei Feng

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Tianjin Key Laboratory of Composite and Functional Materials,School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China

Institute of Advanced Technology and Equipment,Beijing University of Chemical Technology,Beijing 100029,China

National Key R and D Program of ChinaState Key Program of the National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2022YFB38057025213030351973152519731195210309352173078

2024

10.1007/s12598-023-02528-1

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(4)
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