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Embedded cladding-type nickel cobalt aluminium lithium material for lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and coating materials, applied in the field of lithium-ion secondary batteries, can solve the problems of slurry dispersion and stability reduction, damage to current collectors, slurry agglomeration, etc., and achieve simple preparation methods and excellent cycle performance Excellent, good processing performance

Inactive Publication Date: 2017-04-19
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nickel-cobalt-aluminium-lithium oxide also has its serious disadvantages, which hinder its application. First, it has poor compatibility with the electrolyte, easily generates gas, and the cycle stability needs to be improved; at the same time, it has a higher pH value. Makes it highly hygroscopic, leading to increased water content in the material and difficult to remove during baking
Excessive water content will easily lead to the denaturation of the binder PVDF, reduce the dispersion and stability of the slurry, and even lead to agglomeration or agglomeration of the slurry, which reduces the processing performance of the positive electrode material
The higher pH value of the material will also corrode the aluminum foil of the positive electrode collector and generate H 2 Gas, which destroys the current collector and also causes the battery to swell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Weigh the specific surface area as 0.8m 2 / g of nickel-cobalt-aluminum-lithium material and deionized water are adjusted into a paste with a weight ratio of 1:5, then added to the reaction kettle, and stirred to prepare a nickel-cobalt-aluminum-lithium suspension;

[0018] (2) Weigh NiSO 4 :CoSO 4 :MnCl 2 :MgCl 2 =0.3:0.3:0.25:0.15 (molar ratio) and deionized water, ionized water: (NiSO 4 +CoSO 4 +MnCl 2 +MgCl 2 )=1:3 (mass ratio); add to the container and mix, stir to obtain mixed salt solution;

[0019] (3) According to nickel cobalt aluminum lithium material and (NiSO 4 +CoSO 4 +MnCl 2 +MgCl 2 ) is a ratio of 6:1, the mixed salt solution prepared by step (2) and the suspension of step (1) are slowly added to the reactor by a pump, and the pH of the reaction solution is controlled with 3mol / L ammonia water= 10.0~12.5, the reaction temperature is 30~65°C, the stirring speed is 300~400rpm, until the salt solution and suspension are completely poured into...

Embodiment 2

[0026] (1) Weigh the specific surface area as 1.5m 2 / g LiNi 0.8 co 0.10 al 0.10 o 2 After making a paste with deionized water at a weight ratio of 1:5, add it to the reaction kettle and stir to prepare a nickel-cobalt-aluminum-lithium suspension.

[0027] (2) Weigh NiSO 4 :CoSO 4 :MnCl 2 :MgCl 2 =0.3:0.3:0.28:0.12 (molar ratio) and deionized water, ionized water: (NiSO 4 +CoSO 4 +MnCl2+MgCl2)=1:3 (mass ratio); add to the container to mix and stir to obtain a mixed salt solution.

[0028] (3) According to nickel cobalt aluminum lithium material and (NiSO 4 +CoSO 4 +MnCl2+MgCl2) The molar ratio of the elements is 6:1, the mixed salt solution prepared in step (2) and the suspension of step (1) are slowly added to the reaction kettle through the pump, and the ammonia water of 3mol / L Control the pH of the reaction solution to 10.0~12.5, the reaction temperature is 30~65°C, and the stirring speed is 300~400rpm, until the salt solution and suspension are completely poure...

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Abstract

The invention relates to an embedded cladding-type nickel cobalt aluminium lithium material for a lithium ion battery and a preparation method thereof. The material is composed of a body material and a clad material. The body material is nickel cobalt aluminium lithium, and the clad material is nickel cobalt manganese lithium. The preparation method comprises the following steps: preparing a nickel cobalt aluminium lithium suspension; preparing a mixed salt solution of nickel salt, cobalt salt, manganese salt and M metal salt; adding the mixed salt solution and the suspension into a reaction vessel, heating and stirring, standing, filtering, washing until washing liquor is neutral, and drying; ball-milling a lithium source and the obtained dry sample and mixing by a mixer so as to obtain a mixed material of nickel cobalt aluminium lithium coated with a lithium nickel cobalt manganese oxide precursor and the lithium source; and calcining, crushing, and screening so as to obtain the embedded cladding-type nickel cobalt aluminium lithium material for a lithium ion battery. The invention has the following advantages: the material has high capacity, excellent cycle performance, low pH value and good processing property and safety performance; and the preparation method is simple, safe and easy to operate, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a lithium-ion secondary battery, in particular to a nickel-cobalt-aluminum-lithium embedded coating type nickel-cobalt-aluminum-lithium material for a lithium-ion battery and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries are widely used in portable electronic products, electric vehicles, secondary charging and energy storage, aerospace and other fields because of their advantages such as high energy density, long cycle life, and low self-discharge rate. The performance of lithium-ion batteries largely depends on the positive electrode material. As the positive electrode material of lithium-ion batteries, nickel-cobalt-aluminum-lithium oxide has the advantages of high working voltage, large specific capacity, and low cost, and is very suitable for lithium-ion power battery systems. One of the most promising positive electrode materials for power lithium-ion batteries. Nickel-cobalt-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 韩红芳宋二虎程迪李小红尹正中徐云军
Owner HENAN KELONG NEW ENERGY CO LTD
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