Method for modifying ternary composite material

A composite material and modification technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problem of low lithium ion diffusion coefficient and electronic conductivity, low first charge and discharge efficiency of ternary materials, and material rate performance. Deviation and other problems, to achieve the effect of improving the coating rate, low cost and simple method

Inactive Publication Date: 2018-11-27
JIANGSU LENENG BATTERY INC
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Problems solved by technology

The application publication number is CN106450217A, which discloses a modification method of nickel-cobalt-lithium-manganese-oxide ternary material, which effectively solves the problems in the traditional ternary material carbon-coating process by carbon-coating the ternary material. The reduction of lithium nickel oxide has realized the coating of the carbon layer on the surface of the ternary material; at the same time, the carbon-coated nickel-cobalt lithium manganate ternary material has improved the first charge and discharge efficiency, and improved the lithium ion diffusion coefficient and electronic conductivity of the material. The efficiency improves the electrochemical performance of NCM materials, but there are also the following defects: 1) Due to the cation mixing effect and the change of the surface microstructure of the material during the first charging process, the first charge and discharge efficiency of the ternary material is not high; 2) ) The lithium ion diffusion coefficient and electronic conductivity are low, which makes the rate performance of the material deviate; 3) The ternary material will have a strong side reaction with the organic electrolyte in a wide voltage range, causing more side reactions and affecting its cycle performance

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  • Method for modifying ternary composite material

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Experimental program
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Embodiment 1

[0016] A method for modifying a ternary composite material, comprising the following steps;

[0017] 1. Weigh 31.2g (0.1mol) of silver sulfate, 2.4g (0.075mol) of thiourea and 2.65g (0.075mol) of ammonium chloride, respectively, add 1000ml of deionized water to dissolve to obtain three mixed solutions;

[0018] 2. Then pour the silver sulfate and ammonium chloride solution in step 1 into a beaker and stir evenly, then add 105ml of concentrated ammonia water and 150g of hydrazine and stir evenly, finally add thiourea solution and 100ml of deionized water and stir evenly to obtain Solution A;

[0019] 3. Add 81g (1mol) LiNi 0.6 co 0.2 mn 0.2 o 2 (Manufacturer: Ningbo Jinhe New Materials Co., Ltd., model: S76L) Add the ternary precursor powder material to 1000ml deionized water to form a solution with a concentration of 1mol / L and stir evenly to obtain solution B. Weigh 100ml of solution A Add to the reaction vessel containing solution B to obtain mixed solution C;

[0020]...

Embodiment 2

[0022] 1. Weigh 15.6g (0.005mol) of silver sulfate, 1.6g (0.05mol) of thiourea and 0.265g (0.005mol) of ammonium chloride, respectively, add 1000ml of deionized water to dissolve to obtain three mixed solutions;

[0023] 2. Then pour the silver sulfate and ammonium chloride solution in step 1 into the beaker and stir evenly, then add 52.5ml of concentrated ammonia water and 15g hydrazine and stir evenly, finally add thiourea solution and 100ml deionized water and stir evenly Obtain solution A;

[0024] 3. Add 8.1g (0.1mol) LiNi 0.6 co 0.2 mn 0.2 o 2 Add the ternary precursor powder material to 1000ml deionized water to form a solution with a concentration of 0.1mol / L and stir evenly to obtain solution B, then add 50ml solution A to the reaction vessel containing solution B to obtain mixed solution C;

[0025] 4. Put the reaction vessel into the water bath at the set temperature (the set temperature is 60°C), and feed the functional gas NH 3 (The flow rate is 1ml / min), and...

Embodiment 3

[0027] 1. Weigh 62.4g (0.2mol) of silver sulfate, 32g (1mol) of thiourea and 5.3g (0.1mol) of ammonium chloride, respectively, add 1000ml of deionized water to dissolve to obtain three mixed solutions;

[0028] 2. Pour the silver sulfate and ammonium chloride solution in step 1 into a beaker and stir evenly, then add 525ml of concentrated ammonia and 100g hydrazine and stir evenly, finally add thiourea solution and 100ml deionized water and stir evenly to obtain Solution A;

[0029] 3. Add 162g (2mol) LiNi 0.6 co 0.2 mn 0.2 o 2 Add the ternary precursor powder material to 1000ml deionized water to form a solution with a concentration of 2mol / L and stir evenly to obtain solution B, then add 200ml solution A into the reaction vessel containing solution B to obtain mixed solution C;

[0030] 4. Put the reaction vessel into the water bath at the set temperature (the set temperature is 100°C), and feed the functional gas NH 3 (The flow rate is 10ml / min), and use a magnetic sti...

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Abstract

The invention belongs to the field of lithium ion battery materials, and particularly relates to a method for modifying a ternary composite material. The preparation method comprises the following steps: firstly uniformly stirring silver sulfate and thiourea which respectively serve as a silver source and a sulfur source, ammonium chloride serving as a buffering agent, ammonia water and hydrazineserving as a combined complexing agent, adding a ternary material precursor; performing a water bath reaction; and finally preparing the ternary composite material having an inner core of LiNixCoyMn(1-x-y)O2 and shell of silver sulfide. The ternary composite material has high rate performance and cycling performance.

Description

technical field [0001] The invention belongs to the field of preparation of lithium ion battery materials, in particular to a modification method of a ternary composite material. Background technique [0002] As the market's requirements for the mileage of electric vehicles increase, lithium-ion batteries are required to have high energy density, and nickel-cobalt lithium manganese oxide ternary material (NCM), that is, nickel-cobalt lithium manganese oxide ternary layered positive electrode material, has a chemical formula for LiNi 1-x-y co x mn y o 2 , including nickel-based ternary materials, or high-nickel ternary materials (LiNi 1-x-y co x mn y o 2 (1-x-y≥0.5)). Due to the synergistic effect of the three elements Ni, Co, and Mn, the integrated LiCoO 2 , LiNiO 2 and LiMnO 2 The advantages of the three lithium-ion battery cathode materials, its performance has the characteristics of good thermal stability, high energy density, high specific capacity at high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/624H01M10/0525Y02E60/10
Inventor 丁本
Owner JIANGSU LENENG BATTERY INC
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