首页|Boosting rate performance of layered lithium-rich cathode materials by oxygen vacancy induced surface multicomponent integration

Boosting rate performance of layered lithium-rich cathode materials by oxygen vacancy induced surface multicomponent integration

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The rapid development of electric vehicles and portable energy storage systems demands improvements in the energy density and cost-effectiveness of lithium-ion batteries,a domain in which Lithium-rich lay-ered cathode(LLO)materials inherently excel.However,these materials face practical challenges,such as low initial Coulombic efficiency,inferior cycle/rate performance,and voltage decline during cycling,which limit practical application.Our study introduces a surface multi-component integration strategy that incorporates oxygen vacancies into the pristine LLO material Li1.2Mn0.6Ni0.2O2.This process involves a brief citric acid treatment followed by calcination,aiming to explore rate-dependent degradation behavior.The induced surface oxygen vacancies can reduce surface oxygen partial pressure and diminish the generation of O2 and other highly reactive oxygen species on the surface,thereby facilitating the acti-vation of Li ions trapped in tetrahedral sites while overcoming transport barriers.Additionally,the forma-tion of a spinel-like phase with 3D Li+diffusion channels significantly improves Li+diffusion kinetics and stabilizes the surface structure.The optimally modified sample boasts a discharge capacity of 299.5 mA h g-1 at a 0.1 C and 251.6 mA h g-1 at a 1 C during the initial activation cycle,with an impres-sive capacity of 222.1 mA h g-1 at a 5 C.Most notably,it retained nearly 70％of its capacity after 300 cycles at this elevated rate.This straightforward,effective,and highly viable modification strategy pro-vides a crucial resolution for overcoming challenges associated with LLO materials,making them more suitable for practical application.

Lithium-ion batteryLayered lithium rich cathodeSurface multicomponent integrationRate-dependent degradation and Li+diffusion kinetics

Youyou Fang、Yuefeng Su、Jinyang Dong、Jiayu Zhao、Haoyu Wang、Yun Lu、Bin Zhang、Hua Yan、Feng Wu、Lai Chen

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Beijing Key Laboratory of Environmental Science and Engineering,School of Material Science and Engineering,Beijing Institute of Technology,Beijing 100081,China

Chongqing Innovation Center,Beijing Institute of Technology,Chongqing 401120,China

Yibin Libode New Materials Co.,Ltd.,Yibin 64400,Sichuan,China

School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China

Engineering Research Center of the Ministry of Education for Advanced Battery Materials,Central South University,Changsha 410083,Hunan,China

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National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaYibin'Jie Bang Gua Shuai'Beijing Nova ProgramPostdoctoral Fellowship Program of CPSF4B7B beam line of Beijing Synchrotron Radiation Facility4B7B beam line of Beijing Synchrotron Radiation FacilityBL08U1A beam line of Shanghai Synchrotron Radiation Facility

2021YFB240180021875022221790082022JB00420230484241GZB202309312021-BEPC-PT-0059242021-BEPC-PT-0059672021-SSRF-PT-017710

2024

10.1016/j.jechem.2023.12.050

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.92(5)