Preparation method for lithium battery positive electrode material lithium nickel manganese oxide

Abstract

The invention relates to a preparation method for a lithium battery positive electrode material lithium nickel manganese oxide. The preparation method comprises the following steps of (a), adding a lithium source, a nickel source and a manganese source into a solvent to be dissolved and mixed to obtain a first mixed solution, wherein the molar ratio of the lithium source to the nickel source to the manganese source is 10:5:9; (b), adding an oxidant and a mineralizing agent into the first mixed solution, and then moving the mixed solution to an autoclave, and reacting at the temperature of 150-230 DEG C for 48-72 hours; and (c), grinding the product obtained from the step (b) into powder and pressuring into flake-shaped, and then heating processed product in the air atmosphere at the temperature of 800-950 DEG C for 12-24 hours to obtain the lithium battery positive electrode material lithium nickel manganese oxide, wherein the mineralizing agent comprises a main mineralizing agent; the main mineralizing agent is KOH or / and NaOH; the molar ratio of the main mineralizing agent to the nickel source is 60-180:5; and the molar ratio of the oxidant to the nickel source is 6:5. The preparation method for the lithium battery positive electrode material lithium nickel manganese oxide is simple in synthetic process, low in cost, easy to control experiment conditions and convenient to realize the industrial production of the lithium nickel manganese oxide.

Description

technical field [0001] The invention belongs to the field of lithium battery positive electrode materials, and relates to a preparation method of lithium nickel manganese oxide, in particular to a preparation method of lithium nickel manganese oxide lithium battery positive electrode material. Background technique [0002] The advancement and optimization of cathode materials is the key to promote the development of lithium-ion battery technology in the direction of safety, environmental protection, low cost, high energy density and high power density. At present, the widely researched and applied cathode materials mainly include LiMO with layered structure. 2 (M=Co, Ni, Mn), LiMn with spinel structure 2 o 4 and LiFePO 4 , however, these cathode materials have their own disadvantages, LiCoO 2 Lack of resources, high cost, high toxicity; LiNiO 2 Harsh preparation conditions and poor thermal stability; LiMn 2 o 4 The theoretical capacity is not high, and due to the diss...

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Problems solved by technology

At present, Mg, Al, Ti, Cr, Ce, Cu, Fe, Zn, Co, Mo and other ions are all used to prepare doped LiMn 1.5 Ni 0.5 o 4 Cathode material, although doping can reduce the Mn inside the material 3+ The amount to eliminate the 4V level discharge platform and prolong the life of the material, but it will also lead to a decrease in the specific capacity of the material

For the current doped LiMn 1.5 Ni 0.5 o 4 From the perspective of the research status of materials, people are using doping metal elements to improve LiMn 1.5 Ni 0.5 o 4 There are many researches on materials, but the blindness in the selection of doping elements is large, lacking in science and design

The second is that the high-rate charge and discharge performance of the material is not good. As the positive electrode material of the next-generation power lithium-ion battery, spinel LiMn 1.5 Ni 0.5 o 4 The rate performance is better than that of spinel LiMn 2 o 4 Poor, which undoubtedly directly affects the charging and discharging power of the battery, restricting its application in power batteries

The use of surfactants and templates increases the cost and complexity of materials, the step-by-step hydrothermal method prolongs the experimental cycle, and the preparation of precursors increases the uncontrollability of experiments, resulting in irregular shapes and uneven particle sizes of synthesized materials

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