Xin Shijiang, Zhang Haiyan, Hu Zhibing, Zhao Peng, Zhou Chunxian, He Haimei, Liu Peng, Zhang Jiapeng, Zhou Jisheng
State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials Technology, National Engineering Research Center for Fuel Cell and Hydrogen Source, Beijing University of Chemical Technology, Beijing 100029, PR China.
Minmetals New Energy Materials (Hunan) Co.,Ltd, Changsha 410221, PR China.
ACS Appl Mater Interfaces. 2025 Jun 11;17(23):33783-33795. doi: 10.1021/acsami.4c22977. Epub 2025 May 29.
Renewable energy's growth of renewable energy drives the need for advanced lithium-ion batteries (LIBs). LiMnFePO (LMFP) cathode materials show promise but face challenges like the Jahn-Teller effect and metal dissolution, undermining structural stability and cycling performance, especially under elevated temperatures. This study pioneers the strategic doping of high-valence niobium (Nb) into LMFP to address these limitations. The Nb-doped LMFP cathodes were synthesized at an industrial scale using industrially viable coprecipitation and spray-drying methods. Nb is doped into the Li site with controllable atomic content from 0 to 3%. The introduction of Nb reduces antisite defects, accelerates lithium-ion diffusion, and effectively suppresses both the Jahn-Teller effect and manganese dissolution. Notably, the optimized LiMnFeNb@C cathode with 2% Nb exhibits remarkable high-temperature performance, retaining 95.07% of its capacity over 150 cycles at 60 °C and delivering a discharge capacity of 148.4 mAh g. These results underscore the transformative potential of Nb doping in overcoming thermal degradation, offering a compelling pathway for the development of robust, long-life LIB cathodes.
可再生能源的发展推动了对先进锂离子电池（LIBs）的需求。锂锰铁磷酸盐（LMFP）阴极材料具有潜力，但面临诸如 Jahn-Teller 效应和金属溶解等挑战，这会破坏结构稳定性和循环性能，尤其是在高温下。本研究率先将高价铌（Nb）进行策略性掺杂到 LMFP 中以解决这些限制。采用工业上可行的共沉淀和喷雾干燥方法，在工业规模上合成了掺 Nb 的 LMFP 阴极。Nb 以 0 至 3%的可控原子含量掺杂到锂位点。Nb 的引入减少了反位缺陷，加速了锂离子扩散，并有效抑制了 Jahn-Teller 效应和锰溶解。值得注意的是，含 2% Nb 的优化 LiMnFeNb@C 阴极表现出卓越的高温性能，在 60°C 下经过 150 次循环后仍保留其容量的 95.07%，放电容量为 148.4 mAh g。这些结果强调了 Nb 掺杂在克服热降解方面的变革潜力，为开发坚固耐用、长寿命的 LIB 阴极提供了一条引人注目的途径。
