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Preparation method of modified ternary cathode material

A positive electrode material and modification technology, which is applied in the field of preparation of modified ternary positive electrode materials, can solve the problems of destroying the interface structure, poor high-temperature cycle performance of ternary positive electrode materials, and capacity fading, so as to achieve uniform coating coating and benefit electronics The effect of transmitting and increasing the discharge power

Inactive Publication Date: 2015-07-22
田东
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, ternary cathode materials still have the disadvantage of poor high-temperature cycle performance.
When the active material is in contact with the electrolyte, under high temperature conditions, it will be corroded by HF, etc., destroying the interface structure, which will lead to the dissolution of metal Ni, Co, and Al in the electrolyte, resulting in capacity attenuation

Method used

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  • Preparation method of modified ternary cathode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 5g of ternary positive electrode material, the average particle size D50 is 8.53 μm, and perform electroless nickel plating treatment. The process of electroless nickel plating is:

[0027] 1. Add the above-mentioned ternary cathode material into the alcohol aqueous solution with a volume ratio of alcohol to water of 1:1 and a total volume of 1L. The temperature is 25° C., the stirring speed is 200 rpm, and the ultrasonic vibration is performed at a frequency of 30 kHz for 5 min.

[0028] The ternary cathode material was centrifuged and washed several times with deionized water.

[0029] 2. Add the cleaned ternary positive electrode material into a solution with the ingredients of stannous chloride (SnCl2 2H2O) 4g / L, 37% HCl 4mL / L, OP-101mL / L, and the solvent is deionized water with a volume of 1L middle. The temperature is 25°C, the stirring speed is 200 revolutions per minute, and the time is 2 minutes. The ternary cathode material was centrifuged and washed w...

Embodiment 2

[0035]Take 20g of ternary positive electrode material, the average particle size D50 is 13.72 μm, and perform electroless nickel plating treatment. The process of electroless nickel plating is:

[0036] 1. Add the above-mentioned ternary cathode material into an alcohol-water solution with a volume ratio of alcohol to water of 1:2 and a total volume of 1L. The temperature is 25° C., the stirring speed is 200 rpm, and the ultrasonic vibration is performed at a frequency of 35 kHz for 8 min. The ternary was centrifuged and washed several times with deionized water.

[0037] 2. Add the cleaned ternary positive electrode material with stannous chloride (SnCl2 2H2O) 7g / L, 37% HCl 5mL / L, 0.5mL / L each of sucrose ester and OP-10, and the solvent is deionized water , in a solution with a volume of 1 L. The temperature is 25° C., the stirring speed is 400 revolutions per minute, and the time is 2 minutes. The ternary cathode material was centrifuged and washed with deionized water to...

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Abstract

The invention discloses a preparation method of a high-capacity modified ternary cathode material. The cathode material is formed by coating the surface of a ternary cathode with a nickel-plating layer. The preparation method comprises the steps of sequentially carrying out sensitization, activation and reduction treatment on the ternary cathode material in the existence of a dispersing agent, and plating the nickel-plating layer; carrying out thermal treatment on the ternary cathode material with the nickel-plating layer, and thus obtaining the nickel-coated modified ternary cathode material. The preparation method is simple to operate, moderate in process condition and low in cost; the prepared nickel-coated modified ternary cathode material is uniform in the coating of nickel-plating layer, stable in structure and capable of being used for preparing a lithium ion battery which is good in conductivity, high in specific capacity and high in power density.

Description

technical field [0001] The invention relates to a preparation method of a modified ternary positive electrode material, which belongs to the field of lithium ion battery positive electrode materials. Background technique [0002] Since Japan's Sony Corporation took the lead in developing and commercializing lithium-ion batteries in 1990, lithium-ion batteries have developed rapidly. Today lithium-ion batteries have been widely used in various fields of civil and military use. With the continuous advancement of science and technology, people have put forward more and higher requirements for the performance of batteries: the miniaturization and personalized development of electronic equipment requires batteries to have smaller volumes and higher specific energy output; aerospace energy requirements Batteries have cycle life, better low-temperature charge and discharge performance, and higher safety performance; electric vehicles require batteries with large capacity, low cost...

Claims

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Application Information

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IPC IPC(8): H01M4/525
CPCH01M4/131H01M4/1391H01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525H01M2004/028H01M2220/20H01M2220/30Y02E60/10
Inventor 田东
Owner 田东
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