Hydrothermal Synthesis of Mn-doped VO2 (B) as Cathode Material for Lithium-ion Battery

摘要

Mn-doped VO2(B) was synthesized via a hydrothermal reaction from manganese sulfate (M11SO4) and Vanadyl oxalate (VOC2O4 · 5H2O). The effects of the content of Mn on the electrochemical performance of material were studied by means of galvanostatic charge-discharge, cyclic voltammetry and electrochemical impedance spectroscopy (EIS). Compared with pure material VO2(B), the Mn_xVO2(B) which was doped with little Mn(x=0.01,0.02,0.05) had higher specific capacity and more preferable cycle performance. When galvanostatic charged-discharged with 0. 1 C in 1.5-4.0 V. the initial discharge specific capacity of sample Mn1, Mn2 and Mn3 were 204 mAh g~(-1), 242 mAh g~(-1) and 249 mAh g~(-1) respectively larger than pure VO2 sample (181mAh g~(-1)). In particular, the sample of Mn1 exhibited best electrochemical performance. The initial discharge capacity maintained 164 mAh g~(-1) after 50 cycles. The retention rate of capacity was 80%.