Preparation and Properties of Micron Single Crystal High-Voltage LiNi0.5Mn1.5O4 Material

High-voltage LiNi0.5Mn1.5O4 materials with controllable morphology were prepared by an improved copre. cipitation. high. temperature solid. phase method. A low. temperature and high. pressure reaction environment was designed based on the characteristics that lithium salt. containing crystal water was easy to dehydrate. The pre. reaction process introduced before high.temperature calcination, can effectively improve the mixing uniformity and reactivity of lithium salt and oxide precursor, inhibiting the formation of impurity phase and reducing the mixing degree of metal ions. By adjusting the pre. reaction temperature, the morphology and particle size of LiNi0.5Mn1.5O4 materials were controllable. The results showed that the samples synthesized by the pre. reaction temperature of 180 degrees C had a regular octahedral single crystal morphology and relatively uniform size distribution, which effectively inhibit the electrode/electrolyte interface reaction so that the synthesized materials showed excellent cycle stability and rate performance. Its capacity retention rate reached 95.3% after 400 cycles at 1C and room temperature, and the specific capacity of 120.9 mAh.g(-1) could still be released at 20C.