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A kind of preparation method of pre-activated lithium-rich manganese-based positive electrode material for lithium ion battery

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 degraded material stability, easy-to-destroy material structure, degraded material cycle stability, etc., to achieve increased Safety and cycle stability, simple and feasible process, and short preparation cycle

Active Publication Date: 2020-05-05
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[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

Method used

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  • A kind of preparation method of pre-activated lithium-rich manganese-based positive electrode material for lithium ion battery
  • A kind of preparation method of pre-activated lithium-rich manganese-based positive electrode material for lithium ion battery
  • A kind of preparation method of pre-activated lithium-rich manganese-based positive electrode material for lithium ion battery

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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 cathode material for lithium ion batteries, and the specific steps of the method are as follows:

[0024] Step 1: Use the co-precipitation method to prepare the nickel-cobalt-manganese precursor, which is then uniformly mixed with the lithium salt and calcined at high temperature to obtain the lithium-rich manganese-based cathode material, wherein the molar ratio of the lithium salt to the nickel-cobalt-manganese precursor is 1.03~1.17:1, the specific high temperature calcination is: 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℃, Keep at a constant temperature for 8-15 hours, then cool to room temperature naturally;

[0025] Step 2: Add the lithium-rich manganese-based cathode material prepared in Step 1 to the solvent, and stir for 5-30 min with a magnetic stirrer ...

specific Embodiment approach 2

[0027] Embodiment 2: The method for preparing a pre-activated lithium-rich manganese-based positive electrode material for lithium-ion batteries described in the first embodiment. In step 1, 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 pre-activated lithium-rich manganese-based positive electrode material for lithium ion batteries according to specific embodiment 1, in step 2, 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 specifically 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 urgent 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 no pollution, and have become an ideal power source for electronic devices. However, with the development of electric vehicles and energy storage power stations, higher requirements are put forward for battery performance, especially energy density requirements. At present, the key to improving the energy density of lithium batteries lies in the development of cathode materials. The energy density of some traditional...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/052
CPCH01M4/485H01M4/505H01M4/525H01M10/052Y02E60/10
Inventor 王振波王敏君玉富达隋旭磊赵磊
Owner HARBIN INST OF TECH
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