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Preparation method of nickel-cobalt-manganese ternary material enabling element content in gradient distribution

A technology of gradient distribution and element content, applied in electrical components, active material electrodes, electrochemical generators, etc., can solve the problems of poor material stability, poor safety, and affecting material performance, and achieve excellent electrochemical performance and enhanced stability Effects on safety, good cycle performance and thermal stability

Inactive Publication Date: 2018-09-28
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the higher the nickel content in the ternary material, the worse the stability and safety of the material, especially when the surface of the material is in contact with the electrolyte, the level of nickel content on the surface directly affects the performance of the material

Method used

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  • Preparation method of nickel-cobalt-manganese ternary material enabling element content in gradient distribution
  • Preparation method of nickel-cobalt-manganese ternary material enabling element content in gradient distribution
  • Preparation method of nickel-cobalt-manganese ternary material enabling element content in gradient distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this example, the nickel-rich cathode material LiNi with gradient distribution of element content is prepared. 0.8 co 0.1 mn 0.1 o 2 .

[0025] In this example x=0.8, y=0.1, z=0.1.

[0026] Weigh NiSO respectively according to the molar ratio of 8:1:1 4 ·6H 2 O. CoSO 4 ·H 2 O and MnSO 4 ·H 2 O, NiSO 4 ·6H 2 O and CoSO 4 ·H 2 O was dissolved in deionized water and prepared to 2mol L -1 of salt solution A, the MnSO 4 ·H 2 O was dissolved in deionized water and prepared to 2mol L -1 salt solution B, and prepare 4mol·L at the same time -1 Sodium hydroxide solution C and 4mol·L -1 Ammonia solution D. Add deionized water bottom liquid into the reaction kettle, pump three solutions A, C, and D into the reaction kettle at the same time, at the same time, pump solution B into solution A, and keep the feed rate ratio of solution A and solution B as 10:1. Precisely control the pH=11.60 by adjusting the flow rate of the C solution, control the reaction tempe...

Embodiment 2

[0030] In this example, the positive electrode material LiNi with gradient distribution of element content was prepared. 0.6 co 0.2 mn 0.2 o 2 .

[0031] In this example x=0.6, y=0.2, z=0.2.

[0032] Weigh NiSO respectively according to the molar ratio of 6:2:2 4 ·6H 2 O. CoSO 4 ·H 2 O and MnSO 4 ·H 2 O, NiSO 4 ·6H 2 O and CoSO 4 ·H 2 O was dissolved in deionized water and prepared as 2.5mol L -1 of salt solution A, the MnSO 4 ·H 2 O was dissolved in deionized water and prepared as 2.5mol L -1 salt solution B, and prepare 5mol·L at the same time -1 Sodium hydroxide solution C and 5mol·L -1 Ammonia solution D. Add deionized water bottom liquid into the reaction kettle, pump the three solutions of A, C and D into the reaction kettle at the same time, at the same time, pump the B solution into the A solution, and keep the feed rate ratio of the A solution and the B solution as 5:1. Precisely control the pH=11.40 by adjusting the flow rate of the C solution, c...

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Abstract

The invention belongs to the technical field of the lithium ion battery material preparation, and specifically relates to a preparation method of a nickel-cobalt-manganese ternary material enabling element content in gradient distribution. The chemical formula of the positive material is LiNixCoyMnzO2, x is not less than 0.5 and not more than 0.9, and the sum of x, y and z is equal to 1. The preparation process disclosed by the invention is based on co-precipitation method principle, the concentration of the metal ion entering the reaction kettle is continuously changed by changing the feedingway, the Mn element concentration is gradually increased, the concentration of each of the Ni element and the Co element is gradually reduced, thereby synthesizing the nickel-enriched positive material precursor particle with gradiently increased Mn element content and gradiently reduced Ni element content from center to the surface, and finally the nickel-enriched positive material with elementsin gradient distribution is formed by calcining the nickel-enriched positive material precursor particle with the lithium source in a mixed way. The full-gradient material is obviously different fromthe material with uniformly distributed elements from inside to outside and synthesized through the common co-precipitation method, and the higher specific capacity and good circulating performance and heat stability are provided.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery materials, and in particular relates to a preparation method of a nickel-cobalt-manganese ternary cathode material for a lithium-ion battery in which the element content is distributed in a gradient. Background technique [0002] In recent decades, lithium-ion batteries have been widely used as power sources for portable electronic devices such as mobile phones, notebook computers, and digital cameras due to their high energy density, light weight, long cycle life, and good environmental protection. Recently, lithium-ion batteries have received increasing attention as the power supply for plug-in hybrids and all electric vehicles. However, the energy density and safety of these commercialized batteries for the automotive industry need to be further improved. A key factor that determines the energy density of a battery is the specific capacity of the cathode material. a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 高鹏朱永明姜云鹏温广武王桢
Owner HARBIN INST OF TECH AT WEIHAI
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