Porous tungsten trioxide coated positive electrode material and preparation method thereof

A technology of tungsten trioxide and positive electrode materials, which is applied in the direction of battery electrodes, electrochemical generators, structural parts, etc., can solve the problems that affect the cycle stability and rate performance of batteries, the conductivity of materials needs to be improved, and the working voltage is high. Effects of first-time efficiency, capacity retention improvement, and internal resistance reduction

Active Publication Date: 2020-02-18
湖南金富力新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since LiNi 0.5 mn 1.5 o 4 The working voltage of the positive electrode material is high, and the improvement of the above two aspects is difficult to solve the problems that the material is easy to corrode and the electrical conductivity of the material needs to be improved when the working voltage is high, which affects the cycle stability and rate performance of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) LiNi 0.5 mn 1.5 o 4 Preparation of:

[0025] a. Dissolve lithium hydroxide, citric acid, manganese acetate and nickel acetate in a molar ratio of 1.07:2:1.5:0.5 in deionized water, and stir to obtain a transparent solution;

[0026] b. Put the transparent solution obtained in step a into a spray dryer for spray drying to synthesize the precursor powder; wherein, the inlet air temperature for spray drying is 190°C, the outlet air temperature is 100°C, and the speed of the atomizing disc in the spray dryer is 20000r / min;

[0027] c. Calcinate the precursor powder obtained in step b at 850°C for 24h in an air atmosphere, then anneal at 550°C in an oxygen atmosphere for 10h, cool naturally to room temperature, crush and sieve to obtain LiNi 0.5 mn 1.5 o 4 .

[0028] (2) H 2 WO 4 Dissolve in hydrogen peroxide and deionized water, prepare a 0.8mol / L solution, heat in a constant temperature water bath for 2.5h, and form WO 3 Sol; wherein, the volume ratio of hydr...

Embodiment 2

[0033] (1) LiNi 0.5 mn 1.5 o 4 Preparation of:

[0034] a. Dissolve lithium hydroxide, citric acid, manganese acetate and nickel acetate in a molar ratio of 1.07:2:1.5:0.5 in deionized water, and stir to obtain a transparent solution;

[0035] b. Put the transparent solution obtained in step a into a spray dryer for spray drying to synthesize the precursor powder; wherein, the air inlet temperature for spray drying is 200°C, the air outlet temperature is 110°C, and the speed of the atomization disc in the spray dryer is 22000r / min;

[0036] c. Calcinate the precursor powder obtained in step b at 900°C for 22h in an air atmosphere, then anneal at 500°C in an oxygen atmosphere for 12h, and then cool naturally to room temperature before crushing and sieving to obtain LiNi 0.5 mn 1.5 o 4 .

[0037] (2) H 2 WO 4 Dissolve in hydrogen peroxide and deionized water to prepare a 1.0mol / L solution, and heat it in a constant temperature water bath for 3 hours to form WO 3 Sol; W...

Embodiment 3

[0042] (1) LiNi 0.5 mn 1.5 o 4 Preparation of:

[0043] a. Dissolve lithium hydroxide, citric acid, manganese acetate and nickel acetate in a molar ratio of 1.07:2:1.5:0.5 in deionized water, and stir to obtain a transparent solution;

[0044] b. Put the transparent solution obtained in step a into a spray dryer for spray drying to synthesize the precursor powder; wherein, the air inlet temperature of the spray drying is 200°C, the air outlet temperature is 105°C, and the speed of the atomization disc in the spray dryer is 25000r / min;

[0045] c. The precursor powder obtained in step b was calcined at 950°C for 20h in an air atmosphere, then annealed at 600°C for 11h in an oxygen atmosphere, cooled naturally to room temperature, crushed and sieved to obtain LiNi 0.5 mn 1.5 o 4 .

[0046] (2) H 2 WO 4 Dissolve in hydrogen peroxide and deionized water to prepare a 0.9mol / L solution, and heat it in a constant temperature water bath for 2 hours to form WO 3 Sol; Wherein,...

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Abstract

The invention provides a porous tungsten trioxide coated modified positive electrode material and a preparation method thereof. A surface of a positive electrode material is coated with tungsten trioxide, chemical formula is LiNi0.5Mn1.5O4 / WO3, and the porosity of the porous tungsten trioxide is 8-15%. The preparation method comprises steps that firstly, the LiNi0.5Mn1.5O4 is prepared; secondly, H2WO4 is dissolved in hydrogen peroxide and deionized water to prepare a 0.8-1.0 mol / L solution, and WO3 sol is formed by heating in constant temperature water bath; polyethylene glycol is added to theWO3 sol and stirred and ultrasonically dispersed to obtain precursor solution; the LiNi0.5Mn1.5O4 is added to the precursor solution, stirred uniformly and then dried and sintered to obtain the porous tungsten monoxide coated modified positive electrode material. The method is advantaged in that the surface of the positive electrode material is coated through the porous tungsten trioxide, side reactions are suppressed, and cycle performance of a battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a porous tungsten trioxide-coated and modified cathode material and a preparation method thereof. Background technique [0002] With the development of industry and the depletion of fossil energy, the pressure of environmental pollution and energy shortage is increasing. It is imperative to find new energy and develop new energy-saving tools. The development of new energy materials is a major issue in the 21st century. As a new type of green battery, lithium-ion batteries have the advantages of high voltage, high specific energy, long cycle life, stable working voltage, and small self-discharge. At present, they are mainly used in portable electronic products, and are also widely used as vehicle power supplies. The car provides power to reduce the pollution caused by traditional fuel vehicles to the environment. [0003] Cathode material is an important part of lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/48H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 杨亿华王海涛钟毅
Owner 湖南金富力新能源股份有限公司
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