Enhancing the performance of Li-rich oxide cathodes through multifunctional surface engineering

IF 8.1 2区 工程技术 Q1 CHEMISTRY, PHYSICAL Journal of Power Sources Pub Date : 2025-03-14 DOI:10.1016/j.jpowsour.2025.236717
Tongxing Lei , Guolin Cao , Xiuling Shi , Bin Cao , Zhiyu Ding , Yu Bai , Junwei Wu , Kaikai Li , Tongyi Zhang
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Abstract

The commercial development of lithium-rich manganese-based cathode materials is limited by severe capacity decay, voltage attenuation and poor rate capability. Herein, a multifunctional surface engineering is successfully applied to improve Li1.2Mn0.54Co0.13Ni0.13O2 materials by a facile method of solution pretreatment followed by high-temperature thermal treatment. Gradient fluorine doping on the near-surface region is demonstrated to induce the higher ratio of Mn3+/Mn4+, the increasing amounts of oxygen vacancies and the decreasing Li+ diffusion energy barrier. Fast-ion-conductivity spinel phase of LiMn2O4 is spontaneously formed on the subsurface and the outmost coating layer that consists of Li3PO4 and LiF is constructed on the surface. The formed heterogeneous layers could not only facilitate Li + rapid transport but also effectively stabilize the surficial structure. The optimal sample is demonstrated to exhibit superior cycling stability and rate capability. The capacity retention after 200 cycles at 1 C is improved from 67.7 % to 91.0 % and the specific capacity at 8 C is increased from 81.9 to 140.8 mAh/g. The voltage attenuation is significantly mitigated, decreasing from 2.02 to 1.05 mV per cycle. The encouraging results may promote the practical application of lithium-rich manganese-based cathode materials in high-energy-density lithium-ion batteries.
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来源期刊
Journal of Power Sources
Journal of Power Sources 工程技术-电化学
CiteScore
16.40
自引率
6.50%
发文量
1249
审稿时长
36 days
期刊介绍: The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells. Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include: • Portable electronics • Electric and Hybrid Electric Vehicles • Uninterruptible Power Supply (UPS) systems • Storage of renewable energy • Satellites and deep space probes • Boats and ships, drones and aircrafts • Wearable energy storage systems
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