Journal
MATERIALS
Volume 11, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/ma11081455
Keywords
lithium-ion batteries; LiMn2O4; sol-gel method; Si-doping; electrochemical properties
Categories
Funding
- Landmark Innovation Project of Henan Institute of Science and Technology [203010916004]
- High-level Talents Introduction Project of Henan Institute of Science and Technology [203010617010, 203010617011]
- Key Research Project of Education Department of Henan Province [19A150023]
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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.
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