Study On The Preparation Of LiNi_0.5Mn_1.5O₄ By PAA Gel Method As 5V Cathode Material For Lithium-Ion Battery

There are increasing interestings in the high voltage cathode, in accordance with the development of high power lithium ion batteries, and as a power supply for the future vehicle and load leveling system. Among the known, Li insertion compounds, LiCoO₂, LiNiO₂ and LiMn₂O₄, are now used as 4V cathode materials. However, the stability of the materials at fully charged state is a problem, and the cost and the environmentally acceptance for the cobalt and nickel compounds are unfavorable. For LiMn₂O₄, rapid capacity fade under high temperature has been pointed out as severe drawbacks. Besides these drawbacks, their voltage also limits their application in the high power batteries.Among the high voltage cathode materials, LiNi_0.5Mn_1.5O₄ has received much attention because of its high capacity and stable cycleability. But its rate-capability is poor, which may be due to the sluggish kinetic and the dissolution of active mass at high voltage.In order to improve its performance, some research work have beenreported here, include optimizing PAA gel method, and being doped with the...