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Nickel-cobalt-manganese ternary positive electrode material and its preparation method and application, lithium-ion battery, electric vehicle

A positive electrode material and ternary material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of slow diffusion of lithium ions, further improvement of electrochemical performance, large secondary particles, etc.

Active Publication Date: 2019-07-19
GUANGDONG JIANA ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with the existing cathode materials, nickel-cobalt-lithium ternary materials have many advantages, but the electrochemical performance still needs to be further improved.
In lithium-ion batteries, due to the low conductivity of lithium ions and the large secondary particles of ternary materials, the diffusion rate of lithium ions during charging and discharging is slow, which is not conducive to the improvement of electrochemical performance, especially the rate performance.

Method used

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  • Nickel-cobalt-manganese ternary positive electrode material and its preparation method and application, lithium-ion battery, electric vehicle
  • Nickel-cobalt-manganese ternary positive electrode material and its preparation method and application, lithium-ion battery, electric vehicle
  • Nickel-cobalt-manganese ternary positive electrode material and its preparation method and application, lithium-ion battery, electric vehicle

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preparation example Construction

[0057] According to a second aspect of the present invention, a method for preparing the above-mentioned nickel-cobalt-manganese ternary positive electrode material is provided, comprising the following steps:

[0058] (a) add manganese salt, ammoniacal liquor and lye simultaneously in the solution containing ammoniacal liquor, react and obtain manganese hydroxide suspension;

[0059] (b) adding nickel salt solution, cobalt salt solution and manganese salt solution with decreasing concentration to the manganese hydroxide suspension obtained in step (a) to carry out co-precipitation reaction to obtain the precursor of core-shell structure;

[0060] (c) mixing the precursor obtained in step (b) with a lithium source, and then sintering to obtain a nickel-cobalt-manganese ternary positive electrode material.

[0061] The present invention precipitates manganese hydroxide as the nucleus first, then precipitates nickel, cobalt, and manganese on this basis, and keeps the concentrati...

Embodiment 1

[0090] 1. Nickel-cobalt-manganese ternary cathode material

[0091] A nickel-cobalt-manganese ternary positive electrode material, the nickel-cobalt-manganese ternary positive electrode material has a core-shell structure, the core is a hollow core, and the core material is Li 2 MnO 3 , the shell material is LiNi 0.5 co 0.2 mn 0.3 o 2 ;

[0092] Among them, the contents of Ni, Co and Mn are distributed in a gradient in the shell material, the content of Mn gradually decreases from the inner layer to the outer layer, and the contents of Ni and Co gradually increase from the inner layer to the outer layer.

[0093] The diameter of the core of the hollow structure is 2 μm, and the obtained nickel-cobalt-manganese ternary positive electrode material is 5.6 μm.

[0094] The molar percentage of manganese in the nickel-cobalt-manganese ternary material of the innermost layer of the shell material is 50%, and the manganese in the nickel-cobalt-manganese ternary material of the o...

Embodiment 2

[0102] 1. Nickel-cobalt-manganese ternary cathode material

[0103] A nickel-cobalt-manganese ternary positive electrode material, the nickel-cobalt-manganese ternary positive electrode material has a core-shell structure, the core is a hollow core, and the core material is Li 2 MnO 3 , the shell material is LiNi 0.5 co 0.2 mn 0.3 o 2 ;

[0104] Among them, the contents of Ni, Co and Mn are distributed in a gradient in the shell material, the content of Mn gradually decreases from the inner layer to the outer layer, and the contents of Ni and Co gradually increase from the inner layer to the outer layer.

[0105] The diameter of the core of the hollow structure is 2 μm, and the obtained nickel-cobalt-manganese ternary positive electrode material is 5.6 μm.

[0106] The molar percentage of manganese in the nickel-cobalt-manganese ternary material of the innermost layer of the shell material is 50%, and the manganese in the nickel-cobalt-manganese ternary material of the o...

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Abstract

The invention provides a nickel-cobalt-manganese ternary cathode material, a preparation method and an application thereof, a lithium ion battery and an electric vehicle, and belongs to the technicalfield of the nickel-cobalt-manganese ternary cathode material. The invention provides a nickel-cobalt-manganese ternary cathode material, wherein the nickel-cobalt-manganese ternary cathode material is a core shell structure, the core layer is Li2MnO3 with a hollow structure, and the shell material is a nickel-cobalt-manganese ternary material; The content of Mn in the shell material is gradient distribution, and decreases gradually from the inner layer to the outer layer. The nickel-cobalt-manganese ternary cathode material is hollow core-shell structure, The core layer is hollow Li2MnO3, theshell material is Ni-Co-Mn ternary material, and the gradient of Mn decreases in the shell material. This structure shortens the diffusion path of lithium ions, improves the magnification performanceof the material, while maintaining the spherical shape of the material, and has no great influence on the vibration density of the material.

Description

technical field [0001] The invention belongs to the technical field of nickel-cobalt-manganese ternary positive electrode materials, and in particular relates to a nickel-cobalt-manganese ternary positive electrode material, a preparation method and application thereof, a lithium ion battery, and an electric vehicle. Background technique [0002] In recent years, lithium-ion batteries have developed rapidly due to their advantages of high operating voltage, high energy density, long cycle life, wide operating temperature range, safety and no memory effect. Especially with the research and development of electric vehicles, lithium-ion batteries can provide new power sources for them, further promoting the application of lithium-ion batteries. [0003] However, lithium cobaltate, the current commercial cathode material for lithium-ion batteries, is scarce in resources, expensive, and highly toxic, making it urgently necessary to replace lithium cobaltate with new cobalt-free o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 汤依伟吴剑尚国志杨幸
Owner GUANGDONG JIANA ENERGY TECH CO LTD
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