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Preparation method of high-cycle-stability NCA positive electrode material applicable to power type lithium ion battery

A lithium-ion battery, cycle stability technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficult to ensure uniform distribution of elements, difficult to control NCA morphology, etc., to achieve excellent rate performance and cycle stability , easy to promote, and highly practical

Active Publication Date: 2018-05-08
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the physical mixing method used in this method is difficult to ensure the uniform distribution of elements, and it is also difficult to control the shape of NCA.

Method used

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  • Preparation method of high-cycle-stability NCA positive electrode material applicable to power type lithium ion battery
  • Preparation method of high-cycle-stability NCA positive electrode material applicable to power type lithium ion battery
  • Preparation method of high-cycle-stability NCA positive electrode material applicable to power type lithium ion battery

Examples

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preparation example Construction

[0032] The preparation of the precursor firstly weighs nickel salt and cobalt salt according to the element ratio of nickel and cobalt 0.8:0.15. Then, the salt solution composed of Ni and Co salt, the alkaline metaaluminate solution composed of metaaluminate and ammonia water, and the sodium hydroxide solution are prepared by co-precipitation titration of the three solutions.

[0033] The metaaluminate is prepared by mixing aluminum salt with sodium hydroxide in an amount 4-5 times that of the aluminum salt.

[0034] The concentration ratio of the ammonia solution to the salt solution is between 1:2-2:1.

[0035] The concentration ratio of the sodium hydroxide solution to the salt solution is between 2:1-4:1.

[0036] For the preparation of the precursor, 2-6L of ultrapure water is used in the base solution, and ammonia water is used to drop the pH to between 10.5-11.5.

[0037] In the preparation of the precursor, during the titration process, the dropping speed of the alka...

Embodiment 1

[0042] The preparation of the NCA cathode material includes: preparing the NCA precursor by a co-precipitation method, and mixing lithium by a dry method and a wet method.

[0043] The preparation of described NCA precursor, wherein Ni, Co, Al salt all adopt sulfate, ammoniacal liquor usage content (NH 3 ) is 25-28wt% ammonia solution. The titration reaction used an automatic titration reactor, and the rotation speed during the titration process was 600 rap / min.

[0044] In the described mixed lithium method, the lithium source used is LiOH.H 2 O.

[0045] Its specific preparation method is as follows:

[0046](1) First, according to the Ni, Co, Al element ratio 80:15:5, take the sulfate salt with a total mass of 4mol, mix the Ni and Co salts to prepare a salt solution with a concentration of 2mol / L, and weigh 0.9mol Mix NaOH with Al salt to prepare metaaluminate, and add 5.5 mol of ammonia water to the metaaluminate at the same time to prepare a solution with the same vol...

Embodiment 2

[0049] The difference from Example 1 is that

[0050] Ni, Co salt solution, metaaluminate solution, alkali solution concentration are 1mol / L, 1.2mol / L, 2.4mol / L respectively.

[0051] According to the precursor and LiOH.H 2 The O ratio is 1:1.03, and the milling speed is 100rpm.

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Abstract

The invention provides a preparation method of a high-cycle-stability NCA positive electrode material applicable to a power type lithium ion battery. The preparation method comprises the following steps of 1) preparing a precursor by using a meta aluminate method, wherein Ni, Co salt, meta aluminate and ammonium hydroxide dripping speeds are fixed, and by controlling the dripping speed of a NaOH solution, the pH of the base solution is controlled. The precursor prepared by the invention is uniform in appearance and uniform in element distribution; and 2) a lithium mixing method with a dry mixing method and a wet mixing method is adopted, wherein the dry mixing method mainly comprises the steps of performing ball milling and mixing through a low-speed ball mill; the wet mixing method mainlycomprises the steps of adding a mixture into absolute ethyl alcohol to be fully stirred and mixed. By virtue of the method, the lithium elements can be distributed on the surface of the precursor fully and uniformly, and meanwhile, the spherical appearance of the precursor can be well protected. Compared with an NCA material prepared by other methods, the NCA positive electrode material preparedby the invention is simple in preparation process, high in repeatability, and more uniform in material particle size distribution; and charging-discharging performance tests prove that the NCA positive electrode material prepared by the invention has the advantages of high consistency, high specific capacity, high cycle stability and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a method for preparing a high cycle stability NCA cathode material suitable for power lithium ion batteries. Background technique [0002] Due to the incomparable advantages of many traditional batteries such as high energy density, small self-discharge, good cycle performance, and no memory function, lithium-ion batteries are considered to be the most ideal energy storage devices in existing new energy vehicles. However, due to the limitation of the capacity of positive and negative electrode materials, the cruising range of electric vehicles is not ideal, which seriously affects the market popularity of electric vehicles. NCA cathode material (typical composition is LiNi 0.8 co 0.15 Al 0.05 o 2 ) not only integrated LiNiO 2 High capacity and LiCoO 2 At the same time, the doping of Al enhances the structural stability of the material, thereby greatly improving ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M10/0525
CPCH01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 武建飞刘涛李希超孙士美
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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