Metal selenide/c/b composite coated positive electrode material and preparation method thereof

A metal selenide, cathode material technology, applied in battery electrodes, electrochemical generators, structural parts, etc., can solve problems such as poor rate performance of cathode materials, reduce cathode quality, improve rate performance, and solve uneven dispersion. Effect

Active Publication Date: 2021-08-31
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a metal selenide / C / B composite coated cathode material and a preparation method thereof, aiming to solve the technical problem of poor rate performance of current single crystal type cathode materials

Method used

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  • Metal selenide/c/b composite coated positive electrode material and preparation method thereof

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preparation example Construction

[0021] combined with figure 1 , a kind of preparation method of the cathode material of metal selenide / C / B compound coating, comprises the steps:

[0022] Step S1, mixing nickel salt, cobalt salt and manganese salt in a certain proportion to prepare a ternary precursor solution, adding ammonia water and sodium hydroxide solution to adjust the pH between 10-12, controlling temperature and time, filtering, washing and drying, A nickel-cobalt-manganese ternary precursor is obtained.

[0023] Step S2. After mixing the nickel-cobalt-manganese ternary precursor and lithium salt in a molar ratio, sintering at high temperature, crushing and sieving to obtain a single crystal material.

[0024] In this step, the molar ratio of the nickel-cobalt-manganese ternary precursor mixed with the lithium salt is Li:(Ni+Co+Mn)=1.01-1.08, and the high-temperature sintering temperature is 850-1100°C.

[0025] Step S3, according to a certain addition ratio, add the metal salt to the selenized amin...

Embodiment 1

[0034] 1) Weigh Ni(NO 3 ) 2 ·6H 2 O. CoSO 4 ·7H 2 O, MnSO 4 4H 2 O, and mixed to prepare a ternary precursor solution, adding ammonia water and sodium hydroxide solution to adjust the pH to 11, and adjusting the reaction temperature to 50°C, after the reaction was completed, filtered, washed, and then dried at 80°C for 20h to obtain nickel cobalt manganese three According to the ratio of Li:(Ni+Co+Mn)=1.01, lithium carbonate is added into the precursor, mixed with lithium carbonate, sintered at 850°C, and passed through a 200-mesh sieve to obtain an NCM single crystal material.

[0035] 2) 100g of NCM single crystal material, 5g of indium chloride and 5g of zirconium chloride were added under mechanical stirring into a sufficient amount of selenocysteine ​​solution with a mass fraction of 12wt%, and after most of the solvent was removed by rotary evaporation, the Sinter in a nitrogen environment at 500°C for 8 hours, crush and sieve, add to 200mL aqueous solution of acry...

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Abstract

The present invention is applicable to the technical field of positive electrode materials for lithium batteries, and provides a metal selenide / C / B compound-coated positive electrode material and a preparation method thereof. Crystal-type positive electrode material to improve its rate performance, and then coat porous amorphous carbon / boron carbide on the outer layer to control the shuttle effect of metal selenide, isolate the material from the electrolyte, and increase the ion transmission channel to improve the material's Rate performance and cycle performance; at the same time, due to the existence of the carbon coating layer, the amount of conductive agent used in the positive electrode can be reduced, thereby reducing the quality of the positive electrode, improving the mass energy density of the battery, and solving the problem of increased internal resistance caused by uneven dispersion of the conductive agent. question.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium batteries, and in particular relates to a metal selenide / C / B compound-coated positive electrode material and a preparation method thereof. Background technique [0002] At present, cathode materials can be divided into different types of materials such as single crystals and secondary particles in terms of morphology. Single crystal is formed by sintering the ternary precursor mixed with lithium salt through a special sintering process. Since the precursor formed by the agglomeration of primary particles needs to be redispersed, the sintering temperature and the excess ratio of lithium are compared with those of secondary sintering. The ball material is higher, and the high sintering temperature and lithium ratio lead to poor rate performance of the single crystal. At present, the main method is to control the particle size of the single crystal material by using a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/505H01M4/525H01M4/58H01M4/587H01M10/0525
CPCY02E60/10
Inventor 许开华周子龙徐世国陈玉君张明龙周晓燕彭建明
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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