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Preparation method of single crystal particle ternary positive electrode material

A technology of single crystal particles and positive electrode materials, applied in the direction of positive electrodes, electrical components, battery electrodes, etc., can solve the problems of uneven distribution and diffusion of materials on the surface, shortened service life of positive electrodes, uneven local lithium source, etc., and achieve high Effects of energy density, side reaction reduction, and loss reduction

Active Publication Date: 2019-09-13
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above method, the lithium source may be insufficient during high-temperature calcination, forming a lithium-deficient lattice structure. In the second or multiple sinterings, due to the lack of lithium in the lattice, the capacity will decrease, and the structure will be damaged during the cycle. Unstable and shortened positive electrode life
If the lithium source is supplemented during the sintering process, the uneven contact area between the lithium source and the sintered material during the sintering diffusion process will form an uneven local lithium source, so it is necessary to solve the problem of uneven distribution and diffusion on the surface of the material

Method used

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  • Preparation method of single crystal particle ternary positive electrode material
  • Preparation method of single crystal particle ternary positive electrode material
  • Preparation method of single crystal particle ternary positive electrode material

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Experimental program
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Embodiment 1

[0032] Firstly, 2μm Ni with D50 0.8 co 0.1 mn 0.1 (OH) 2 The precursor and lithium hydroxide are weighed according to the stoichiometric number, and potassium acetate is added as the first solid additive, wherein the molar ratio of the lithium source, the ternary precursor and the first solid additive is 1.1:1:0.4, and the mixture is uniform. The mixture was placed in an oxygen atmosphere furnace with an oxygen volume ratio of 95% at 5 °C min -1 The heating rate is increased to 450°C and kept for 10 hours; then at 5°C·min -1 The heating rate is raised to 800°C and kept for 15 hours; then cooled to 700°C and kept for 10 hours. There are three sinterings in total, and the sintering process ends. Then it was treated with water at a temperature of 50°C for a total of 20 hours, and then placed in an oxygen atmosphere furnace for heat treatment at 700°C for 15 hours. The NCM 811 ternary lithium battery positive electrode material with large primary particle size was obtained. ...

Embodiment 2

[0034] Firstly, 2μm Ni with D50 0.8 co 0.1 mn 0.1 (OH) 2 The precursor and lithium hydroxide are weighed according to the stoichiometric number, and then lithium oxalate is added as the first solid additive, wherein the molar ratio of the lithium source, the ternary precursor and the first solid additive is 1.05:1:0.2, and the mixture is uniform. The mixture was placed in an oxygen atmosphere furnace with an oxygen volume ratio of 95% at 5 °C min -1 The heating rate is increased to 450°C and kept for 10 hours; -1 The heating rate is raised to 800°C and kept for 10 hours; then lowered to 700°C and kept for 10 hours, a total of three sinterings, and the sintering process ends. After the sintering is completed, it is then washed with water at a temperature of 50°C for 12 hours, and then placed in an oxygen atmosphere furnace for heat treatment at 700°C for 15 hours to obtain NCM811 ternary lithium battery cathode material with a large primary particle size.

Embodiment 3

[0036] First set D50 to 2μm Ni 0.8 co 0.1 mn 0.1 (OH) 2 The precursor and lithium hydroxide are weighed according to the stoichiometric number, and then sodium citrate is added as the first solid additive, wherein the molar ratio of the lithium source, the ternary precursor and the first solid additive is 1.08:1:0.3, and the mixture is uniform . The mixture was placed in an oxygen atmosphere furnace with an oxygen volume ratio of 95% at 5 °C min -1 The heating rate is increased to 500°C and kept for 10 hours; -1 The heating rate was raised to 700°C and kept for 8 hours; then at 10°C·min -1 The heating rate is raised to 900°C and kept for 8 hours; then cooled to 700°C and kept for 8 hours. There are four sinterings in total, and the sintering process is ended. After the sintering is completed, it is placed in an oxygen atmosphere furnace for heat treatment at 550°C for 10 hours to obtain NCM 811 ternary lithium battery cathode material with a large primary particle size. ...

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Abstract

The invention discloses a preparation method of a single crystal particle ternary positive electrode material for a lithium ion battery. The preparation method specifically comprises the steps of uniformly mixing a lithium source, a nickel cobalt manganese ternary precursor and a first solid additive; performing staged sintering which is divided into a plurality of heating stages and a cooling stage, wherein the sintering temperature in the heating stages is 400-1,000 DEG C, and the sintering temperature in the cooling stage is 600-800 DEG C, the first solid additive is an AB type substance, Ais a metal cation, and B is an anion containing carboxyl; and finally, obtaining the high-energy-density single crystal particle ternary positive electrode material which is relatively large in primary particle and excellent in electrochemical performance. The preparation method of the ternary positive electrode material provided by the invention is simple in process condition, easily available in raw materials, relatively high in practicability and suitable for mass production, and has a very high application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a ternary positive electrode material for lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, no memory effect, and environmental friendliness. With the application of lithium-ion batteries in more and more fields, such as portable electronic devices, automobiles, and energy storage power stations, people have higher requirements for the energy density of lithium-ion batteries. At present, there are mainly the following methods to improve the energy density of lithium-ion batteries: 1. Increase the working voltage, but the increase in working voltage has its limitations, and it may lead to unstable operation of the battery and deterioration of life or safety; 2. Improve the activity of the electrode The ratio of substances, such as increasing the thickness of...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525H01M2004/028Y02E60/10
Inventor 郭玉国盛航石吉磊张旭东邹玉刚殷雅侠
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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