Synthesis of Li2MnSiO4-graphene composite and its electrochemical performances as a cathode material for lithium ion batteries.
The Li2MnSiO4 is a promising candidate as a cathode for lithium ion batteries due to its large theoretical capacity of 330 mA h g(-1) and high thermal stability. However, the problems related to low electronic conductivity and large irreversible capacity at the first cycle limits its practical use as a Li-ion cathode material. We have developed a carbon coated Li2MnSiO4-graphene composite electrode to overcome these problems. Our designed electrode exhibits high reversible capacity of 301 mA h g(-1), with a high initial coulombic efficiency, and a discharge capacity at current rate of 0.5 C, that is double value of carbon coated Li2MnSiO4-carbon black composite electrode. These significant improvements are attributed to fast electron transport along the graphene sheet.
Jeonghyun
J
Kim
Taeseup
T
Song
Hyunjung
H
Park
Junhan
J
Yuh
Ungyu
U
Paik