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Positive electrode material, preparation method thereof and battery

A positive electrode material and material technology, applied in the field of positive electrode materials and its preparation, can solve problems such as poor compatibility, interface problems, and poor battery performance

Inactive Publication Date: 2020-02-21
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional high-nickel cathode materials have poor interfacial compatibility with solid-state electrolytes, which can easily form "interface problems" and lead to poor battery performance

Method used

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  • Positive electrode material, preparation method thereof and battery
  • Positive electrode material, preparation method thereof and battery
  • Positive electrode material, preparation method thereof and battery

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preparation example Construction

[0032] The method for preparing the above-mentioned positive electrode material according to an embodiment of the present invention includes the following steps: mixing a core material solution, a shell material solution, an alkali and a complexing agent to react with a precursor, then performing aging and solid-liquid separation to obtain the precursor, and The precursor is mixed with the first lithium source for solid-phase sintering to obtain a core-shell structure material, and then the core-shell structure material, the second lithium source, an organic solvent and a chelating agent are mixed, dried and sintered to obtain a positive electrode material. Wherein, the core material solution is a mixed salt solution of nickel salt, cobalt salt and manganese salt, the shell material solution is a cobalt salt solution, and the second lithium source is lithium niobate and / or lithium titanate.

[0033] The preparation method of the positive electrode material of the present invention...

Embodiment 1

[0042] According to the molar ratio Ni:Co:Mn=8:1:1, a nuclear material solution with a concentration of 2mol / L was prepared, and the salts therein were nickel sulfate, cobalt sulfate and manganese sulfate. A cobalt sulfate solution with a concentration of 2mol / L was prepared as the shell material solution.

[0043] Take 0.9L of the core material solution and 0.1L of the shell material solution, respectively, and add them to the reaction kettle successively, and add NaOH solution and ammonia water to adjust the pH of the reaction kettle to about 11. The concentration of NaOH solution is 10mol / L, the concentration of ammonia water is 0.2mol / L, and the volume ratio of the two is 7:3. Control the temperature of the solution to about 50°C, stir and pass inert gas for protection. After all the reaction liquid is added, the stirring speed is reduced, and the mixture is aged for 24 hours. After aging, filter, wash, and dry to obtain the precursor, such as figure 1 Shown. Add 78g Li ac...

Embodiment 2

[0052] Take 0.8L of the core material solution and 0.2L of the shell material solution respectively, and add them to the reaction kettle successively, and add NaOH solution and ammonia water to adjust the pH of the reaction kettle to about 11. The concentration of NaOH solution is 10mol / L, the concentration of ammonia water is 0.2mol / L, and the volume ratio of the two is 7:3. Control the temperature of the solution to about 50°C, stir and pass inert gas for protection. After all the reaction solution is added, the stirring speed is reduced, and the mixture is aged for 24 hours. After aging, the precursor is obtained by filtering, washing and drying. Add 78g Li according to the molar ratio of Li:M=1.05:1 (M=Ni, Co, Mn) 2 CO 3 As a lithium source and mixed uniformly, in an oxygen atmosphere, the mixed material is first heated to 750°C for 4h, and then at 820°C for 12h, to obtain the core-shell structure material Li[(Ni 0.8 Co 0.1 Mn 0.1 ) 0.8 Co 0.2 ]O 2 .

[0053] Take a certain...

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Abstract

The invention relates to a positive electrode material, a preparation method thereof and a battery. The positive electrode material is of a core-shell structure with a coating layer on the surface; the core-shell structure comprises an inner core and a shell layer coating the surface of the inner core, the inner core is made of nickel cobalt lithium manganate, the shell layer is made of lithium cobalt oxide, and the coating layer is made of lithium niobate and / or lithium titanate. In the positive electrode material, the coating layer endows the material with excellent ionic conductivity, goodinterfacial compatibility with sulfide solid electrolyte can be achieved, and the interface problem is solved; the core material can provide high gram volume, and the shell layer can endow the material with excellent rate capability, so that the positive electrode material has excellent electrochemical performance. When the positive electrode material is applied to an all-solid-state lithium ion battery, the specific discharge capacity, the cycle performance and the rate capability of the battery can be effectively improved.

Description

Technical field [0001] The invention relates to the technical field of energy materials, in particular to a positive electrode material, a preparation method thereof, and a battery. Background technique [0002] As a new type of energy storage device, lithium-ion batteries have attracted more and more attention due to their high energy density and higher working voltage. The current lithium-ion battery electrolytes on the market are mainly organic liquid electrolytes, which are prone to leakage during battery use, and organic solvents are flammable and easy to be oxidized. Therefore, there are serious safety hazards during use. In view of this , It is necessary to develop a safer electrolyte to replace the liquid electrolyte, and the all-solid-state lithium-ion battery uses solid electrolyte, which not only acts as the electrolyte, but also can be used as a diaphragm, which can effectively prevent the diaphragm from overheating. The shrinkage problem can fundamentally avoid safe...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525
CPCH01M4/364H01M4/485H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 刘学良夏良俊王耐清徐海平刘昆林涛李世达王翔
Owner SOUNDON NEW ENERGY TECH CO LTD
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