Sol-Gel Synthesis of Silicon-Doped Lithium Manganese Oxide with Enhanced Reversible Capacity and Cycling Stability

Materials

Yashuang Wang¹  Dongdong Li¹  Fang Li¹  Hongyuan Zhao²  Tingting Wu²  Jianxiu Su²  Yongfeng Li²  Zhankui Wang²  Guifang Wang³ 

[1] Research Branch of Advanced Materials & Green Energy, Henan Institute of Science and Technology, Xinxiang 453003, China;School of Mechanical & Electrical Engineering, Henan Institute of Science and Technology, Xinxiang 453003, China;School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China;

关键词: lithium-ion batteries;    LiMn2O4;    sol-gel method;    Si-doping;    electrochemical properties;   

DOI  :  10.3390/ma11081455

来源: DOAJ

【 摘 要 】

A series of silicon-doped lithium manganese oxides were obtained via a sol-gel process. XRD characterization results indicate that the silicon-doped samples retain the spinel structure of LiMn2O4. Electrochemical tests show that introducing silicon ions into the spinel structure can have a great effect on reversible capacity and cycling stability. When cycled at 0.5 C, the optimal Si-doped LiMn2O4 can exhibit a pretty high initial capacity of 140.8 mAh g−1 with excellent retention of 91.1% after 100 cycles, which is higher than that of the LiMn2O4, LiMn1.975Si0.025O4, and LiMn1.925Si0.075O4 samples. Moreover, the optimal Si-doped LiMn2O4 can exhibit 88.3 mAh g−1 with satisfactory cycling performance at 10 C. These satisfactory results are mainly contributed by the more regular and increased MnO6 octahedra and even size distribution in the silicon-doped samples obtained by sol-gel technology.

【 授权许可】

Unknown