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A method for vulcanizing on the surface of spinel lithium nickel manganate positive electrode material

A technology of lithium nickel manganese oxide and positive electrode materials, which is applied in the field of lithium ion battery material preparation, can solve the problem of weak adhesion between the surface modification layer and the surface of the positive electrode material, the improvement of the electrochemical performance of the positive electrode material, and the increase of the interface of the positive electrode material Resistance and other issues, to achieve the effect of improving cycle performance and rate performance, low cost, and low equipment requirements

Inactive Publication Date: 2020-07-10
FUJIAN NORMAL UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although a large number of experimental reports have confirmed that surface modification significantly improves the electrochemical performance of lithium nickel manganese oxide cathode materials, most of the reported surface modification methods have some shortcomings, such as the surface modification layer cannot be well deposited on the cathode material. Surface, the adhesion force between the surface modification layer and the surface of the positive electrode material is not strong, which undoubtedly increases the interface resistance between the positive electrode materials and has a negative impact on the improvement of the electrochemical performance of the positive electrode material

Method used

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  • A method for vulcanizing on the surface of spinel lithium nickel manganate positive electrode material
  • A method for vulcanizing on the surface of spinel lithium nickel manganate positive electrode material
  • A method for vulcanizing on the surface of spinel lithium nickel manganate positive electrode material

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Embodiment 1

[0028] Take by weighing 2.724 gram of nickel acetate, 7.348 gram of manganese acetate and 2.300 gram of lithium acetate are dissolved in 400ml deionized water, add 13.142 gram of tartaric acid after continuous stirring at room temperature for 30 minutes, drip ammoniacal liquor in stirring state, adjust the pH value of solution, the solution The pH value is controlled at about 6.8, and then continuously stirred under a water bath at 90°C until a gel-like liquid is obtained.

[0029] The gel liquid was dried for 10 hours in a forced air drying oven at a temperature of 280° C., and then the fluffy substance obtained after drying was ground to obtain a gel precursor powder.

[0030] The collected gel precursor powder was placed in a muffle furnace and calcined in an air atmosphere: firstly, the temperature was raised from room temperature to 500°C at a rate of 3°C / s, and then sintered at 500°C for 5 hours, and then sintered at 3°C / s. The heating rate of °C / min was increased to 900...

Embodiment 2

[0040] Weigh 2.918 grams of nickel nitrate, 7.364 grams of manganese acetate and 1.421 grams of lithium nitrate and dissolve them in 400 ml of deionized water. After stirring for 30 minutes at room temperature, add and weigh 12.621 grams of citric acid. PH value, the pH value of the solution is controlled at about 6.8, and then continuously stirred in a water bath at 85 °C until a gel-like liquid is obtained. The gel liquid was dried in a blast drying oven at a temperature of 260° C. for 16 hours, and then the fluffy substance obtained after drying was ground to obtain a gel precursor powder. The collected gel precursor powder was placed in a muffle furnace and calcined in an air atmosphere: firstly, the temperature was raised from room temperature to 550 °C at a heating rate of 3 °C / s, sintered at 550 °C for 5 hours, and then calcined at 3 °C. The temperature increase rate of °C / min was increased to 900 °C, and the calcination was carried out at 900 °C for 15 hours. After ca...

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Abstract

The invention relates to a method for surface vulcanization of a spinel nickel lithium manganese oxide positive electrode material. The method comprises the following steps: firstly, dissolving compounds of soluble Li, Ni and Mn into deionized water according to molar ratio, obtaining mixed solution; then, adding a metal ion chelating agent to obtain a gel liquid, drying and grinding to obtain powder, and performing roasting to obtain spinel nickel lithium manganese oxide positive electrode material powder; further dispersing the powder in absolute ethyl alcohol, adding 3-aminopropyl triethoxysilane, performing washing and centrifugal separation after reaction, and obtaining a surface-activated spinel nickel lithium manganese oxide positive electrode material powder after reaction; dispersing the positive electrode material powder and thioacetamide into the absolute ethyl alcohol, regulating a PH value to be 7.5-8.5, performing washing and centrifugal separation after reaction, sintering after drying, and obtaining surface- vulcanized spinel nickel lithium manganese oxide positive electrode material. In the method provided by the invention, surface constituents of the spinel nickellithium manganese oxide positive electrode material are changed effectively through the vulcanization technology, cycle performance and rate capability of the spinel nickel lithium manganese oxide positive electrode material are improved, and the method is easy to be implemented and used in industry.

Description

Technical field: [0001] The invention relates to a method for vulcanizing the surface of a spinel lithium nickel manganese oxide positive electrode material, and belongs to the technical field of lithium ion battery material preparation. [0002] technical background [0003] Lithium-ion batteries are a new generation of practical rechargeable batteries, which have the advantages of high working voltage, high energy density, long cycle life, no memory effect and small self-discharge, and have been widely used in portable electronic products, electric tools, new energy Vehicles, military equipment, aerospace and energy storage power systems and many other fields are regarded as high-tech products that are of great significance to people's lives, national economy and social development in the 21st century. With the vigorous development of electric vehicles, smart grids and large-scale energy storage, lithium-ion batteries with high operating voltage and high energy density have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/525H01M4/505H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 危璐雅林应斌刘国镇林志雅黄志高
Owner FUJIAN NORMAL UNIV
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