文献类型：期刊文献

英文题名：Petroleum Coke-Derived Silicon-Carbon Microspheres with Transition Metal Doping for Enhanced Lithium Storage

作者：Gong, Qiaohui[1];Liu, Shumin[1];Duan, Yidan[1];Pang, Xinlu[1];Lin, Fangmin[1];Wang, Jitong[1,2];Ma, Cheng[3];Ling, Licheng[4]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Green Chem Engn & Ind Catalysis, Shanghai, Peoples R China;[2]Guangxi Univ, Univ Engn Res Ctr Green Chem New Mat, Sch Chem & Chem Engn, Nanning, Guangxi, Peoples R China;[3]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai, Peoples R China;[4]East China Univ Sci & Technol, Sch Chem Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai, Peoples R China

年份：2026

卷号：12

期号：3

外文期刊名：CHEMNANOMAT

收录：;EI(收录号：20260920180796);WOS:【SCI-EXPANDED(收录号:WOS:001727166800025)】；

基金：This study was supported by National Natural Science Foundation of China (Grant U21A2060 and 22178116), and Fundamental Research Funds for the Central Universities (Grant JKD01251701).

语种：英文

外文关键词：artificial graphite; lithium-ion batteries; silicon-based anode; transition metal doping

摘要：Silicon-based anodes for lithium-ion batteries are hindered by the large volume expansion and low intrinsic conductivity of silicon. To overcome these issues, petroleum coke-derived silicon-carbon microspheres doped with transition metals (V, Mn, and Ni) were prepared via a one-step spray-drying method. In this configuration, nano-silicon functions as the active core for a high capacity, while an artificial graphite (AG) framework derived from petroleum coke provides conductive pathways and accommodates volume changes. Transition metal doping further introduces additional lithium storage sites and improves electronic conductivity. The optimized Mn-doped material (0.3%Mn@AG-Glu-Si) exhibits outstanding cycling stability, delivering an initial discharge capacity of 1803.2 mAh g(-1) and retaining 1245.9 mAh g(-1) after 100 cycles at 0.5 A g(-1). Furthermore, during the activation phase, it demonstrates a high initial discharge capacity of 2093.6 mAh g(-1) with a Coulombic efficiency of 86.64% at 0.1 A g(-1), confirming its high lithium storage capability. Mechanism analysis reveals that Mn doping strengthens the binding energy (-6.83 eV) and Li+ adsorption energy (-3.1 eV), as well as improves electron transport by increasing the density of states near the Fermi level. This work presents a practical and effective strategy for developing high-performance silicon-based anode materials.