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Urea-assisted mixed gas treatment on Li-Rich layered oxide with enhanced electrochemical performance

Journal of Energy Chemistry 2022年第3期31卷 123-132,I0005页

作者： Liying Bao Lei Wei nuoting fu Jinyang Dong Lai Chen Yuefeng Su Ning Li Yun Lu Yongjian Li Shi Chen Feng Wu School of Materials Science and Engineering Beijing Institute of TechnologyBeijing Key Laboratory of Environmental Science and EngineeringBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China School of Automation Beijing Institute of TechnologyBeijing 100081China

Lithium-rich manganese-based oxides(LRMOs)have been considered as one of the most promising cathode materials owing to their superior specific capacity and high operating ***,their largescale commercial applications are limited due to problems such as structural instability,voltage decay,and poor cycle ***,pre-generated oxygen vacancies and oxygen-deficient phase were introduced to Li_(1.2)Mn_(0.6)Ni_(0.2)O_(2)(LMNO)using a facile urea-assisted mixed gas treatment(UMGT)method for facilitating electronic and ionic conductivity,reducing the surface oxygen partial pressure,and suppressing the release of lattice *** with the pristine LMNO material,the UMGT sample modified at 200℃exhibited enhanced discharge capacity,capacity retention,and rate *** addition,the Li+diffusion coefficient significantly improved by 50%than that of the reference *** importantly,the voltage decay was effectively suppressed,with average potential decreasing from 0.53 V(LMNO)to 0.39 V(UMGT-200)after 200 cycles at 1 *** proposed UMGT method provides an effective strategy to alleviate the phase transition and improve the electrochemical performance for lithium-rich materials,and identifies a promising research direction to inhibit the voltage decay of layered anion redox cathode materials.

关键词： Lithium-rich oxides Pre-generated oxygen vacancies Oxygen-deficient Voltage decay

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