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Preparation method of coated ternary nickel-cobalt-manganese lithium oxide positive electrode material

A technology of nickel-cobalt-manganese-lithium oxide and nickel-cobalt-manganese-lithium, applied in electrical components, battery electrodes, electrochemical generators, etc., can solve the problems of inability to effectively improve the high-temperature cycle performance of materials, low electronic conductivity and ion conductivity , to achieve the effect of improving high temperature cycle performance, improving processing performance and reducing energy consumption

Inactive Publication Date: 2019-04-16
宁夏汉尧富锂科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned cladding material is an insulator-type inert cladding material, and its electronic conductivity and ionic conductivity are both low, so it is not an ideal cladding material, and cannot effectively improve the high-temperature cycle performance of the material.

Method used

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  • Preparation method of coated ternary nickel-cobalt-manganese lithium oxide positive electrode material
  • Preparation method of coated ternary nickel-cobalt-manganese lithium oxide positive electrode material

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Effect test

Embodiment 1

[0029] A method for preparing a coated ternary nickel-cobalt-manganese-manganese-lithium positive electrode material, comprising the following steps:

[0030] (1) Preparation of ternary nickel-cobalt-manganese-lithium precursor:

[0031] 1) Metal salt solution preparation: nickel sulfate 6 hydrate, cobalt sulfate 7 hydrate, and manganese sulfate 1 hydrate were added with water to prepare 2 mol / L salt solution respectively;

[0032] 2) Dilute lye preparation: dilute 30% concentrated sodium hydroxide lye (about 10.7M) into 4mol / L dilute lye;

[0033] 3) Preparation of dilute ammonia solution: dilute 22% concentrated ammonia water (about 12.5M) with water to prepare 2mol / L dilute ammonia solution.

[0034] Feed N into the 10L reactor 2 , first add 5L of 2mol / L dilute ammonia solution through a peristaltic pump as the bottom liquid, and respectively prepare the above nickel sulfate solution, cobalt sulfate solution and manganese sulfate solution according to the molar ratio of N...

Embodiment 2

[0040] A method for preparing a coated ternary nickel-cobalt-manganese-manganese-lithium positive electrode material, comprising the following steps:

[0041] (1) Preparation of ternary nickel-cobalt-manganese-lithium precursor:

[0042] 1) Metal salt solution preparation: nickel sulfate 6 hydrate, cobalt sulfate 7 hydrate, and manganese sulfate 1 hydrate were added with water to prepare a 2mol / L salt solution;

[0043] 2) Dilute lye preparation: dilute 30% concentrated sodium hydroxide lye into 4mol / L dilute lye;

[0044] 3) Preparation of dilute ammonia solution: dilute 20% concentrated ammonia water with water to prepare 0.5mol / L dilute ammonia solution;

[0045] Introduce N into the 10L reactor 2 , through the peristaltic pump, first add 2.5L of 0.5mol / L dilute ammonia solution as the bottom liquid, and use the co-precipitation method to separate the nickel salt solution, cobalt salt solution, and manganese salt solution according to the molar ratio of Ni:Co:Mn=5:2:3 Th...

Embodiment 3

[0051] A method for preparing a coated ternary nickel-cobalt-manganese-manganese-lithium positive electrode material, comprising the following steps:

[0052] (1) Preparation of ternary nickel-cobalt-manganese-lithium precursor:

[0053] 1) Metal salt solution preparation: nickel sulfate 6 hydrate, cobalt sulfate 7 hydrate, and manganese sulfate 1 hydrate were added with water to prepare a 2mol / L salt solution;

[0054] 2) Dilute lye preparation: dilute 30% concentrated sodium hydroxide lye into 5mol / L dilute lye;

[0055] 3) Preparation of dilute ammonia solution: dilute 22% concentrated ammonia water with water to prepare 1mol / L dilute ammonia solution;

[0056] Introduce N into the 10L reactor 2 , first add 3.5L of 1mol / L dilute ammonia solution as the bottom liquid through the peristaltic pump, and use the co-precipitation method to separate the nickel salt solution, cobalt salt solution, and manganese salt solution according to the molar ratio of Ni:Co:Mn=55:15:30 Add ...

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Abstract

The invention discloses a preparation method of a coated ternary nickel-cobalt-manganese lithium oxide positive electrode material. The preparation method comprises the following steps of (1) preparing a ternary nickel-cobalt-manganese lithium precursor; (2) preparing an oxide-coated ternary nickel-cobalt-manganese lithium precursor; and (3) preparing an ion conductor oxide-coated ternary nickel-cobalt-manganese lithium positive electrode material. By the preparation method of the positive electrode material, a lithium ion is easy to de-intercalate from a surface layer of the material, and thehigh-temperature circulation performance of the material is improved; a coating layer does not react with an electrolyte, interface side reaction caused by contact of the main body material and the electrolyte is reduced, and the safety of the material is improved; the processing performance of a pole plate during the uniform coating process is improved, and the high-temperature circulation performance of the material after being assembled into a battery is improved; and the prepared positive electrode material does not need to be subjected to a roasting process for two times, the energy consumption is reduced, and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of preparation of electrode materials for lithium-ion secondary batteries, and in particular relates to a method for preparing a coated ternary nickel-cobalt-manganese-manganese-lithium cathode material. Background technique [0002] To meet the demands of electric vehicles and renewable energy storage systems, a new generation of lithium-ion batteries (LIBs) must have higher energy / power density, longer cycle life, and better safety performance. The cathode material is the limiting component of capacity. As an excellent cathode material for high-voltage LIBs with layered lithium transition metal oxides, ternary nickel-cobalt-manganese-lithium (NCM) materials combined with LiCoO 2 Compared with it, it has many advantages, such as high specific capacity, low cost, low toxicity and better safety performance. However, there is still a serious problem with NCM materials, that is, poor high-temperature cycle performance....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/48H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 靳佳张彬周大桥李来强张宁
Owner 宁夏汉尧富锂科技有限责任公司
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