Synthesis and electrochemical performance of Li₂Mg_0.15Mn_0.4Co_0.45SiO₄/C cathode material for lithium ion batteries

Abstract

The synthesis, structure and performance of Li₂Mg_0.15Mn_0.4Co_0.45SiO₄/C cathode material were studied. The Li₂Mg_0.15Mn_0.4Co_0.45SiO₄/C solid solution with orthorhombic unit cell (space group Pmn2₁) was synthesized successfully by combination of wet process and solid-state reaction at high temperature, and its electrochemical performance was investigated primarily. Li₂Mg_0.15Mn_0.4Co_0.45SiO₄/C composite materials deliver a charge capacity of 302 mA·h/g and a discharge capacity of 171 mA·h/g in the first cycle. The discharge capacity is stabilized at about 100 mA·h/g after 10 cycles at a current density of 10 mA/g in the voltage of 1.5–4.8 V vs Li/Li⁺. The results show that Mg-substitution for the Co ions in Li₂Mn_0.4Co_0.6SiO₄ improves the stabilization of initial structure and the electrochemical performance.

Keywords

lithium ion battery / Li₂Mg_0.15Mn_0.4Co_0.45SiO₄/C / cathode material / synthesis

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