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Lithium ion battery positive electrode material, preparation method and lithium ion battery

A technology for lithium ion batteries and cathode materials, which is applied in the fields of lithium ion battery materials, cathode materials for lithium ion batteries, and preparation, can solve the problems of uncontrollable coating thickness, low electronic conductivity, gel, etc., and achieves the electrochemical performance of the battery. Lifting, high ionic conductivity, effect of simplifying the pulping process

Pending Publication Date: 2022-03-29
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] High-nickel ternary materials have advantages that other cathode materials do not have in terms of energy density, but currently there are still some problems in high-nickel ternary materials in terms of surface alkali content, surface structure stability, thermal stability, etc., which are mainly reflected in the following Four aspects: First, after high-nickel ternary materials are exposed to water and carbon dioxide in the air, lithium compounds such as lithium carbonate and lithium hydroxide are easily produced on the surface, which easily causes risks such as gelation in the process of preparing positive electrode materials. Affect coating quality and production capacity; Second, it will promote gas escape during charging and discharging, hinder the transportation of lithium ions, and cause safety problems
Third, the highly oxidative high-valent transition metal ions on the surface of high-nickel ternary materials are prone to side reactions with the electrolyte, which increases the polarization of the battery and reduces the electrochemical performance.
However, problems such as uneven coating, uncontrollable coating thickness, and large coating volume still exist
Uneven coating will inevitably lead to the above four problems in the cycle process. Excessive coating thickness will affect the ion and electron transport of the material. At the same time, a large coating amount will cause irreversible loss of capacity.
Moreover, the electronic conductivity of coating materials such as oxides, phosphates, and fluorides is generally very low, so while suppressing the side reactions of materials, it also hinders the rapid deintercalation of lithium ions, and cannot effectively increase the rate of high-nickel ternary materials. performance

Method used

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  • Lithium ion battery positive electrode material, preparation method and lithium ion battery
  • Lithium ion battery positive electrode material, preparation method and lithium ion battery
  • Lithium ion battery positive electrode material, preparation method and lithium ion battery

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preparation example Construction

[0051] Embodiments of the present disclosure also provide a method for preparing a positive electrode material for a lithium-ion battery, the method comprising:

[0052] Prepare the main body of the positive electrode material of the lithium ion battery;

[0053] Covering the outer surface of the main body of the positive electrode material of the lithium ion battery with a Si-O layer;

[0054] coating the outer surface of the Si-O layer with a conductive polymer layer;

[0055] A conductive carbon material layer is coated on the outer surface of the conductive polymer layer.

[0056] By adopting the above preparation method, the outer surface of the main body can be coated with a Si—O layer, a conductive polymer layer and a conductive carbon material layer in sequence.

[0057] Described preparation method specifically comprises:

[0058] S101. Preparing a nickel-cobalt-manganese hydroxide precursor, mixing the nickel-cobalt-manganese hydroxide precursor with a lithium sou...

Embodiment 1

[0077] S101, according to Ni element, Co element, Mn element molar ratio is 8:1:1 NiSO 4 ·6H 2 O, CoSO 4 ·7H 2 O and MnSO 4 ·6H 2 O is dissolved in deionized water to form a 1.5mol / L mixed metal ion solution; under a nitrogen atmosphere, the mixed metal ion solution, ammonia water and NaOH solution are mixed to obtain a mixed solution, and the mixed solution is stirred for 24 hours and then co-precipitated to get spherical Ni 0.8 co 0.1 mn 0.1 (OH) 2 powder, the spherical Ni 0.8 co 0.1 mn 0.1 (OH) 2 After the powder was filtered, it was washed several times with deionized water at 60 °C, and then vacuum-dried at 120 °C for 12 h to obtain Ni 0.8 co 0.1 mn 0.1 (OH) 2 Precursor; the Ni 0.8 co 0.1 mn 0.1 (OH) 2 The precursor and lithium hydroxide monohydrate are uniformly mixed according to the molar ratio of Li element to M element Li / M=1.05, pre-calcined at 200°C-1200°C, and then calcined in an oxygen atmosphere of 600°C-2000°C to produce Lithium-nickel-cobal...

Embodiment 2

[0082] S101, according to Ni element, Co element, Mn element molar ratio is 8:1:1 NiSO 4 ·6H 2 O, CoSO 4 ·7H 2 O and MnSO 4 ·6H 2 O is dissolved in deionized water to form a 1.5mol / L mixed metal ion solution; under a nitrogen atmosphere, the mixed metal ion solution, ammonia water and NaOH solution are mixed to obtain a mixed solution, and the mixed solution is stirred for 20 hours and then co-precipitated to get spherical Ni 0.8 co 0.1 mn 0.1 (OH) 2 powder, the spherical Ni 0.8 co 0.1 mn 0.1 (OH) 2 After the powder was filtered, it was washed several times with deionized water at 50 °C, and then vacuum-dried at 150 °C for 10 h to obtain Ni 0.8 co 0.1 mn 0.1 (OH) 2 Precursor; the Ni 0.8 co 0.1 mn 0.1 (OH) 2 The precursor and lithium hydroxide monohydrate are uniformly mixed according to the molar ratio of Li element to M element Li / M=1, pre-calcined at 200°C-1200°C, and then calcined in an oxygen atmosphere of 600°C-2000°C to produce Lithium-nickel-cobalt-m...

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Abstract

The invention discloses a lithium ion battery positive electrode material, a preparation method and a lithium ion battery. The lithium ion battery positive electrode material comprises a main body part, the outer surface of the main body part is coated with a Si-O layer, the outer surface of the Si-O layer is coated with a conductive polymer layer, and the outer surface of the conductive polymer layer is coated with a conductive carbon material layer. The Si-O layer, the conductive polymer layer and the conductive carbon material layer are sequentially coated outside the main body part of the positive electrode material of the lithium ion battery, so that the positive electrode material has relatively high electronic conductivity and ionic conductivity, buffer and protection effects can be provided for expansion and shrinkage of the positive electrode material, additional addition of a conductive agent is not needed, and the cost is reduced. While the cost is saved and the pulping process is simplified, the use amount of the positive electrode conductive agent of the lithium ion battery can be reduced, and the battery electrochemical performance such as the battery rate and cycle can be improved.

Description

technical field [0001] The present disclosure relates to the technical field of lithium-ion battery materials, and more specifically, to a lithium-ion battery cathode material, a preparation method and a lithium-ion battery. Background technique [0002] High-nickel ternary materials have advantages that other cathode materials do not have in terms of energy density, but currently there are still some problems in high-nickel ternary materials in terms of surface alkali content, surface structure stability, thermal stability, etc., which are mainly reflected in the following Four aspects: First, after high-nickel ternary materials are exposed to water and carbon dioxide in the air, lithium compounds such as lithium carbonate and lithium hydroxide are easily produced on the surface, which easily causes risks such as gelation in the process of preparing positive electrode materials. It affects the coating quality and production capacity; second, it will promote gas escape durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525C01G53/00C01B33/113C01B32/05
CPCH01M4/62H01M4/624H01M4/625H01M4/505H01M4/525H01M10/0525C01G53/44C01B33/113C01B32/05Y02E60/10
Inventor 葛立萍袁晓涛田志明郝嵘肖晶
Owner BYD CO LTD