Behaviour of the spinel LiV2O4 as a positive electrode for secondary Li cells.

The electrochemical behaviour of the spinel LiV2O4 has been examined in Li cells. At least one Li+/mol can be inserted into the cubic ctructure without altering the basic V2O4 spinel framework. In the range 0.1<x<1, the OCV/x in Li1+xV2O4 curve shows a two-phase region which consists of the LiV2O4 spinel phase and cubic Li2V2O4 rocksalt phase. In prolonged cyclic experiments with prototype Li cells.LiV2O4-based cathode have provide satisfactory electrode capacities and cell energy densities. On account of the relatively high Li+ diffusion coefficient in the range 0<x<1, these electrodes can deliver capacities in excess of 0.1 Ah/g at the C/3 rate. Both overcharging and overdischarging initially increases the electrode capacity. However, the capacity decreases significantly if cell are continuously overcharged, particularly at high current rate.