Preparation method of Al doped and modified lithium nickel manganate positive electrode material

Abstract

The invention discloses a preparation method of an Al doped and modified lithium nickel manganate LiNi<0.5>Mn<1.5>O<4> positive electrode material. The preparation method comprises the following stepsof taking nickel nitrate, manganese nitrate and lithium nitrate as raw materials, and adding the three components into a citric acid solution, performing ultrasonic treatment and then spraying out bya high-frequency sprayer, and performing quick drying on the sprayed mist-shaped solution at 600 DEG C; performing sintering on the dried product to obtain the lithium nickel manganate LiNi<0.5>Mn<1.5>O<4> positive electrode material and preparing the lithium nickel manganate LiNi<0.5>Mn<1.5>O<4> positive electrode material; and next, performing mixing on aluminium oxide powder and the obtained lithium nickel manganate LiNi<0.5>Mn<1.5>O<4> positive electrode material, and adding absolute ethyl alcohol, performing ultrasonic treatment, drying and sintering to obtain Al doped and modified lithium nickel manganate LiNi<0.5>Mn<1.5>O<4> positive electrode material powder. After 30 cycles, the specific capacity retention rate of the Al doped and modified lithium nickel manganate LiNi<0.5>Mn<1.5>O<4> positive electrode material is still 91.2%, and the cycle stability of the lithium nickel manganate LiNi<0.5>Mn<1.5>O<4> positive electrode material is greatly improved.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, in particular to an Al-doped lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 Preparation method of cathode material. Background technique [0002] With the development of electric vehicles, the requirements for electrode materials are getting higher and higher, especially for cathode materials. Lithium nickel manganese oxide cathode materials have a higher voltage platform, so they have broad application prospects as power battery materials. At present, the lithium nickel manganese oxide material has the problem of poor electrochemical cycle performance in use. In order to solve this problem, the current research mainly focuses on the doping of metal ions to replace part of the manganese ions, and the voltage of the lithium nickel manganese oxide material will change after doping with different elements. [0003] The doping of lithium nickel manganese oxide includes metal ion d...

AI Technical Summary

Problems solved by technology

The researchers focused on the electrochemical performance of materials with different particle sizes at 25 and 55°C. The research showed that powders with lower synthesis temperatures and smaller particle sizes exhibited higher capacity, but powders with smaller particle sizes showed lower capacity. Poor cycle stability, the material processed at 750°C is cycled less than 40 times at 55°C and the specific capacity drops below 80mAh / g