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Method for preparing NCA positive electrode material of lithium-ion battery by utilizing coprecipitation method

A technology for lithium ion batteries and cathode materials, which is applied in the field of preparing lithium ion battery NCA cathode materials by co-precipitation method, can solve the problems of poor cycle performance and poor particle uniformity, and achieves low equipment requirements, uniform shape and good cycle. performance effect

Pending Publication Date: 2020-03-27
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing lithium-ion battery NCA positive electrode material by co-precipitation method, so as to solve the technical problems of poor particle uniformity and poor cycle performance of NCA positive electrode material

Method used

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  • Method for preparing NCA positive electrode material of lithium-ion battery by utilizing coprecipitation method
  • Method for preparing NCA positive electrode material of lithium-ion battery by utilizing coprecipitation method
  • Method for preparing NCA positive electrode material of lithium-ion battery by utilizing coprecipitation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Synthesis of precursors

[0029] Weigh 0.08mol analytically pure NiSO 4 ·6H 2 O (21g), 0.015mol analytically pure CoSO 4 ·7H 2 O (4.21g) and 0.025mol analytically pure Al 2 (SO 4 ) 3 18H 2 O (16.6g), the three were dissolved in 300ml of deionized water successively to form a mixed salt solution, marked as solution A;

[0030] Weigh 0.4g NaOH and 0.7g sulfosalicylic acid respectively, mix them with a certain volume of 0.2mol / L NH 3 ·H 2 O mixed solution was dissolved in 300mL of deionized water, marked as solution B;

[0031] Add solution B to the peristaltic pump and drop it into solution A at a certain speed, and keep the pH value of the reaction process at 11 by strictly controlling the titration speed, while keeping the mixed solution constantly stirring;

[0032] Control the aging time for 11 hours to control the degree of reaction. During the aging process, keep the ambient temperature at 65°C. After the aging process, use deionized water and alcohol ...

Embodiment 2

[0037] (1) Synthesis of precursors:

[0038] Weigh 0.08mol analytically pure NiSO 4 ·6H 2 O (21g), 0.015mol analytically pure CoSO 4 ·7H 2 O (4.21g) and 0.025mol analytically pure Al 2 (SO4) 3 18H 2 O (16.6g), the three were dissolved in 300ml of deionized water successively to form a mixed salt solution, marked as solution A;

[0039] Weigh 0.4g NaOH and 0.7g sulfosalicylic acid respectively, mix them with a certain volume of 0.2mol / L NH 3 ·H 2 O mixed solution was dissolved in 300mL of deionized water, marked as solution B;

[0040] Control the aging time for 11 hours to control the degree of reaction. During the aging process, keep the ambient temperature at 65°C. After the aging process, use deionized water and alcohol to repeatedly centrifuge the precipitate obtained after aging until the solution If it is neutral, the neutral sample after cleaning is placed in a vacuum drying oven at 130°C for 8 hours and then sieved to obtain Ni 0.8 co 0.15 Al 0.05 (OH) 2 P...

Embodiment 3

[0044] (1) Synthesis of precursors:

[0045] Weigh 0.08mol analytically pure NiSO 4 ·6H 2 O (21g), 0.015mol analytically pure CoSO 4 ·7H 2 O (4.21g) and 0.025mol analytically pure Al 2 (SO 4 ) 3 18H 2 O (16.6g), the three were dissolved in 300ml of deionized water successively to form a mixed salt solution, marked as solution A;

[0046] Weigh 0.4g NaOH and 0.7g sulfosalicylic acid respectively, mix them with a certain volume of 0.2mol / L NH 3 ·H 2 O mixed solution was dissolved in 300mL of deionized water, marked as solution B;

[0047] Control the aging time for 11 hours to control the degree of reaction. During the aging process, keep the ambient temperature at 65°C. After the aging process, use deionized water and alcohol to repeatedly centrifuge the precipitate obtained after aging until the solution If it is neutral, the neutral sample after cleaning is placed in a vacuum drying oven at 130°C for 8 hours and then sieved to obtain Ni 0.8 co 0.15 Al 0.05 (OH) ...

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Abstract

The invention discloses a method for preparing an NCA positive electrode material of a lithium-ion battery by utilizing a coprecipitation method. According to the invention, NH3-H2O and sulfosalicylicacid are used as double complexing agents to effectively complex Al 3+, a precursor with uniform and regular particle size is prepared by controlling pH and aging time, and finally, the NCA materialhas better multiplying power and cycle performance by regulating and controlling proper lithium passing amount. Under the experiment conditions, the lithium passing amount of the prepared positive electrode material is controlled to be 6%, and when the aging time is 11 h, the positive electrode material has the optimal electrochemical performance.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a method for preparing lithium-ion battery NCA cathode materials by a co-precipitation method. Background technique [0002] The development trend of electric vehicle EV and hybrid electric vehicle HEV is very rapid. Among them, the power battery as the vehicle power has attracted much attention. Lithium-ion batteries have become the first choice for power batteries because of their high energy density, excellent cycle life, memory effect, low self-discharge rate, and low pollution. In the development process of lithium-ion batteries. Cathode materials are always a key factor. In recent years, the ternary cathode material NCA has the potential to be widely used as the cathode material for lithium-ion batteries. The main advantages of NCA as a cathode material for lithium-ion batteries are: a relatively stable discharge platform and high lithium storage capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/485H01M4/525
CPCC01G53/006H01M4/525H01M4/485H01M10/0525C01P2004/03Y02E60/10
Inventor 黄宇布嘉豪马美品李海军蔡惠群
Owner YINLONG ENERGY CO LTD
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