Preparation method of pre-activated lithium-rich manganese-based positive electrode material used for lithium ion battery
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A lithium-ion battery, lithium-rich manganese-based technology, applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of easily damaged material structure, deteriorated material cycle stability, deteriorated material stability, etc., to achieve process Simple and feasible, increased safety and cycle stability, and short preparation cycle
Active Publication Date: 2018-04-06
HARBIN INST OF TECH
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[0003] The purpose of the present invention is to solve the problem that the existing pre-activated lithium-rich manganese-based material preparation method easily destroys the material structure and deteriorates the stability of the material, and provides a method for preparing a pre-activated lithium-rich manganese-based positive electrode material for lithium ion batteries. The method can achieve pre-activation of lithium-rich materials without destroying the structure of the material, not only does not deteriorate the cycle stability of the material, but has a significant improvement, and at the same time improves the capacity of the material and the first Coulombic efficiency
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specific Embodiment approach 1
[0023] Specific Embodiment 1: This embodiment records a method for preparing a pre-activated lithium-rich manganese-based positive electrode material for lithium-ion batteries. The specific steps of the method are as follows:
[0024] Step 1: Prepare a nickel-cobalt-manganese precursor by co-precipitation, then uniformly mix it with lithium salt, and calcinate at a high temperature to obtain a lithium-rich manganese-based positive electrode material, wherein the molar ratio of lithium salt to nickel-cobalt-manganese precursor is 1.03~1.17:1, high-temperature calcination is specifically: at a heating rate of 5℃ / min, from room temperature to 300~500℃, constant temperature for 3~6h, and then at a heating rate of 5℃ / min to 650~950℃, Constant temperature for 8-15 hours, then naturally cool to room temperature;
[0025] Step 2: Add the lithium-rich manganese-based positive electrode material prepared in step 1 into the solvent, and stir with a magnetic stirrer for 5-30 minutes, so t...
specific Embodiment approach 2
[0027] Specific embodiment two: the preparation method of a lithium-ion battery pre-activated lithium-rich manganese-based positive electrode material described in specific embodiment one, in step one, the molecular formula of the lithium-rich manganese-based positive electrode material is xLi 2 MnO 3 ·(1-x)LiMO 2 , where M=Ni, Co, Mn, 0
specific Embodiment approach 3
[0028] Specific embodiment three: the preparation method of a kind of pre-activated lithium-rich manganese-based positive electrode material for lithium-ion batteries described in specific embodiment one, in step two, the solvent is water, alcohol, ethylene glycol, isopropanol or One of N-methylpyrrolidone.
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Abstract
The invention discloses a preparation method of a pre-activated lithium-rich manganese-based positive electrode material used for a lithium ion battery, and belongs to the technical field of materialsynthesis. According to the method, a lithium-rich material precursor is prepared firstly, and then a lithium salt is added, and next, the mixture is mixed and sintered to obtain a lithium-rich manganese-based positive electrode material; and next, the positive electrode material is added into a solvent to be stirred and dispersed uniformly, and the product is subjected to microwave or heating treatment to obtain the pre-activated lithium-rich manganese-based positive electrode material used for the lithium ion battery. The preparation method achieves the advantages as follows: by virtue or microwave treatment or solution stirring treatment at a relatively high temperature, lithium ion deintercalation from the surface of the lithium-rich material can be induced, so that material pre-activation is realized, and the discharge capacity, the initial coulombic efficiency, the rate and cycle stability and the like of the lithium-rich material are improved effectively; meanwhile, oxygen release in the circulation can be reduced, and safety and cycle stability are improved; the preparation method is simple and feasible in process, short in preparation period, low in cost, capable of greatly improving the comprehensive performance of the lithium-rich manganese-based material, and is expected to realize commercial application.
Description
technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a preparation method of a pre-activated lithium-rich manganese-based positive electrode material for a lithium ion battery. Background technique [0002] With the development of society, energy and environment have become increasingly serious problems. It is imminent to seek environmentally friendly and pollution-free energy and energy storage equipment. Lithium batteries are favored because of their high energy density, environmental protection and pollution-free, and have become ideal power sources for electronic devices. However, with the development of electric vehicles and energy storage power stations, higher requirements are put forward for the performance of batteries, especially the requirements for energy density. At present, the key to improving the energy density of lithium batteries lies in the development of cathode materials. The energy de...
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