Abstract
Capability of obtaining high capacity by exchanging more than one lithium ion has made lithium iron silicate (Li2FeSiO4) very attractive to be an ideal cathode material for lithium ion batteries. However, high deintercalation voltage and large deformation are expected during the delithiation of the second lithium ion. In this work, the nominal 2% sulfur doped carbon coated Li2FeSiO4 composite was prepared by sol-gel precursor and solid-state reaction method. The results revealed that a well crystallized Pmn21 phase was formed, and no common impurities including iron oxide and lithium silicate were identified. The initial discharge capacity of 229.2 mAh·g-1 was obtained at 0.1C and room temperature, which corresponds to 1.38 moles lithium ions per formula unit. The capacity fluctuated to 185.6 mAh·g-1 after 50 cycles, achieving the capacity retention of 81%.
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