Preparation method of lithium ion battery positive electrode material NCM811

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of increasing Li+ diffusion kinetic resistance, poor high temperature performance, restricting commercialization, etc., and achieves suppression of cation mixing. , the effect of reducing the possibility and improving the utilization rate

Inactive Publication Date: 2021-01-12
管小丹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The appearance of the surface reconstruction layer will increase the Li + Diffusion kinetic resistance, leading to capacity drop
High-nickel NCM layered materials also have disadvantages such as poor high-temperature performance and low tap density that restrict the commercialization of this material

Method used

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  • Preparation method of lithium ion battery positive electrode material NCM811
  • Preparation method of lithium ion battery positive electrode material NCM811
  • Preparation method of lithium ion battery positive electrode material NCM811

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of lithium-ion battery cathode material NCM811, specifically comprising the steps of:

[0023] S1: Add nickel sulfate, cobalt sulfate and manganese sulfate into deionized water according to the molar ratio n(Ni):n(Co):n(Mn)=0.8:0.1:0.1, stir ultrasonically to dissolve them fully, and then add the concentration It is 8.2mol / L ammonia solution, adjust the pH value to 11.3, heat to 65°C, stir for 15h, filter, and dry the filter residue at 80°C to obtain the precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 .

[0024] S2: the precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 and lithium hydroxide were added to the mortar, and the grinding was continued for 30min, in which the precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 The mass ratio of lithium hydroxide to lithium hydroxide is 1:1.06, and then placed in a tube furnace, the air is first evacuated with nitrogen, and then oxygen is introduced at a flow rate of 0.18L / min, and the temperature is raised to 350°C and then kept ...

Embodiment 2

[0027] A preparation method of lithium-ion battery cathode material NCM811, specifically comprising the steps of:

[0028] S1: Add nickel sulfate, cobalt sulfate and manganese sulfate into deionized water according to the molar ratio n(Ni):n(Co):n(Mn)=0.8:0.1:0.1, stir ultrasonically to dissolve them fully, and then add the concentration It is 8.5mol / L ammonia solution, adjust the pH value to 11.6, heat to 85°C, stir for 24h, filter, and dry the filter residue at 90°C to obtain the precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 .

[0029] S2: the precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 and lithium hydroxide were added to the mortar, and the grinding was continued for 50min, in which the precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 The mass ratio of lithium hydroxide to lithium hydroxide is 1:1.21, and then placed in a tube furnace, the air is first evacuated with nitrogen, and then oxygen is introduced at a flow rate of 0.21L / min, and the temperature is raised to 380°C and then kept ...

Embodiment 3

[0032] A preparation method of lithium-ion battery cathode material NCM811, specifically comprising the steps of:

[0033] S1: Add nickel sulfate, cobalt sulfate and manganese sulfate into deionized water according to the molar ratio n(Ni):n(Co):n(Mn)=0.8:0.1:0.1, stir ultrasonically to dissolve them fully, and then add the concentration It is 8.3mol / L ammonia solution, adjust the pH value to 11.4, heat to 70°C, stir and react for 18h, filter, and dry the filter residue at 85°C to obtain the precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 .

[0034] S2: the precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 and lithium hydroxide were added to the mortar, and the grinding was continued for 40min, in which the precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 The mass ratio of lithium hydroxide to lithium hydroxide is 1:1.12, and then placed in a tube furnace, the air is first evacuated with nitrogen, and then oxygen is introduced at a flow rate of 0.19L / min, and the temperature is raised to 360°C and ...

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Abstract

The invention discloses a preparation method of a lithium ion battery positive electrode material NCM811, which comprises the following steps: adding a metal nickel salt, a cobalt salt and a manganesesalt into deionized water according to a molar ratio of n(Ni):n(Co):n(Mn)=0.8:0.1:0.1, carrying out ultrasonic treatment, adding an ammonia water solution, adjusting the pH value, carrying out a heating reaction, and conducting filtering and drying to obtain a precursor; adding the precursor and a lithium source into a mortar, conducting grinding, putting the ground material into a tubular furnace, emptying air with nitrogen, introducing oxygen, conducting heating to a certain temperature, conducting cooling, conducting grinding with a mortar, conducting sieving with a 200-mesh sieve, addingthe sieved material into deionized water, adding sodium tartrate and alpha-cyclodextrin, conducting ultrasonic dissolving, transferring the dissolved material into a high-pressure reaction kettle, conducting reacting at a certain temperature, conducting filtering, putting filter residues into a tubular furnace, introducing oxygen, and conducing calcining and cooling to obtain the positive electrode material NCM811. The lithium ion battery positive electrode material NCM811 prepared by the invention has relatively high cyclic discharge capacity, and the performance structure is relatively stable and is not easy to attenuate in a cyclic use process.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery positive electrode materials, and in particular relates to a preparation method of lithium-ion battery positive electrode material NCM811. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long life and environmental friendliness, and have been used in electric vehicles and large-scale energy storage systems in recent years. The main components of a lithium-ion battery are a negative electrode, a positive electrode, a separator, an electrolyte, and a battery case. Among them, the development of cathode materials greatly limits the energy density of batteries. Therefore, nickel-rich ternary LiNi with high specific capacity 1-x-y co x mn y o 2 (NCM) materials have attracted much attention. For example, LiNi 0.8 co 0.1 mn 0.1 o 2 (NCM811) material is considered to be one of the most promising positive electrode materials for achievin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01M4/505H01M4/525H01M10/0525
CPCC01G51/44C01P2002/72C01P2004/03C01P2004/61H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 管小丹
Owner 管小丹
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