ABSTRACT

M2GeO4 (M = Co, Fe and Ni) was synthesized as an anode material for lithium-ion batteries and its electrochemical characteristics
were investigated. The Fe2GeO4 electrode exhibited an initial discharge capacity of 1127.8 mAh g-1 and better
capacity retention than Co2GeO4 and Ni2GeO4. A diffusion coefficient of lithium ion in the Fe2GeO4 electrode was measured
to be 12.7 × 10-8cm2 s-1, which was higher than those of the other two electrodes. The electrochemical performance
of the Fe2GeO4 electrode was improved by coating carbon onto the surface of Fe2GeO4 particles. The carbon-coated Fe2-
GeO4 electrode delivered a high initial discharge capacity of 1144.9 mAh g-1 with good capacity retention. The enhanced
cycling performance was mainly attributed to the carbon-coated layer that accommodates the volume change of the active
materials and improves the electronic conductivity. Our results demonstrate that the carbon-coated Fe2GeO4 can be a promising
anode material for achieving high energy density lithium-ion batteries.

Author

Subramanian Yuvaraj¹, Myung-Soo Park¹, Veerasubramani Ganesh Kumar¹, Yun Sung Lee²,
and Dong-Won Kim¹,*
¹Department of Chemical Engineering, Hanyang University, Seungdong-Gu, Seoul 04763, Republic of Korea
²Faculty of Chemical Engineering, Chonnam National University, Buk-Gu, Gwangju 61186, Republic of Korea