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B/Mg co-doped high-nickel ternary precursor material, positive electrode material and preparation method

A positive electrode material and co-doping technology, applied in the direction of electrical components, battery electrodes, electrochemical generators, etc., can solve the problems of increasing process control difficulty, air pollution, high cost, etc., to achieve easy industrial production, reduce side reactions, low cost effect

Active Publication Date: 2021-02-26
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can increase the specific capacity of the material, but it uses organic solvents as dispersants and has a filtration process, which increases the difficulty of process control and high cost
Moreover, the post-treatment of organic solvents is easy to cause air pollution, which is not conducive to the development concept of green environmental protection

Method used

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  • B/Mg co-doped high-nickel ternary precursor material, positive electrode material and preparation method
  • B/Mg co-doped high-nickel ternary precursor material, positive electrode material and preparation method
  • B/Mg co-doped high-nickel ternary precursor material, positive electrode material and preparation method

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Experimental program
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Effect test

Embodiment 1

[0044] (1) NiSO 4 ·6H 2 O. CoSO 4 ·6H 2 O, MgSO4 ·6H 2 O and B 2 o 3 dissolved in water, the molar ratio of Ni:Co:Mg:B is 0.8:0.1:0.025:0.025, and the metal salt solution A is prepared. MgSO 4 ·6H 2 O and B 2 o 3 Dissolved in water to prepare solution B, the concentration of B and Mg in solution B is consistent with the concentration of B and Mg in solution A;

[0045] (2) Pass ammonia alkali into the reactor to control the initial pH to 11.8. Control the stirring speed at 500 r / min, start to pass through the metal salt solution A, and react until the average particle size is 4.3-5 μm. Reduce the stirring speed to 300 r / min, stop feeding metal salt solution A, and start feeding solution B (at the same flow rate). In an oven at ℃, the drying time is 2~4h, and the ternary precursor [Ni 0.8 co 0.1 Mg 0.05 B 0.05 ](OH) 2 ;

[0046] (3) The resulting ternary precursor [Ni 0.8 co 0.1 Mg 0.05 B 0.05 ](OH) 2 with LiCO 3 The molar ratio of Li:(Ni+Co+Mg+B) is (1~...

Embodiment 2

[0052] (1) NiNO 3 ·6H 2 O. CoNO 3 ·6H 2 O, MgSO 4 and B 2 o 3 dissolved in water, the molar ratio of Ni:Co:Mg:B is 0.8:0.1:0.0125:0.0375, and the metal salt solution A is prepared. MgSO 4 ·6H 2 O and B 2 o 3 Separately dissolved in water to prepare solution B, the concentration of B and Mg in solution B is consistent with the concentration of B and Mg in metal salt solution A;

[0053] (2) Pass ammonia alkali into the reactor to control the initial pH to 12.0. Control the stirring speed at 600 r / min, start to pass through the metal salt solution A, and react until the average particle size is 4.3~5 μm. Reduce the stirring speed to 400 r / min, stop feeding metal salt solution A, and start feeding solution B (at the same flow rate). In an oven at 160°C, the drying time is 2~4h, and the ternary precursor [Ni 0.8 co 0.1 Mg 0.025 B 0.075 ](OH) 2 ;

[0054] (3) The resulting ternary precursor [Ni 0.8 co 0.1 Mg 0.025 B 0.075 ](OH) 2 with LiCO 3 The molar ratio ...

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Abstract

The invention provides a B / Mg co-doped high-nickel ternary precursor material, a positive electrode material and a preparation method. The preparation method comprises the following steps: performingintermittent reaction on mixed soluble salt of Ni, Co, Mg and B and soluble salt of only Mg and B to prepare a [NixCoyMgzB1-x-y-z](OH)2 precursor with a core-shell structure, mixing the [NixCoyMgzB1-x-y-z](OH)2 precursor with a lithium source, and performing two-stage heating sintering to obtain the positive electrode material. Mg and B are doped in the high-nickel precursor, the cycling stabilityand rate capability of the material are improved, the positive electrode material obtained through sintering is co-coated with boron oxide and magnesium oxide, the contact area of the material and anelectrolyte in the charging and discharging process is reduced, side reactions are reduced, and the safety, cyclicity and electrochemical performance of the battery are improved.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, mainly relates to a lithium-ion battery ternary precursor material and positive electrode material, in particular to a B / Mg co-doped ternary precursor material, positive electrode material and a preparation method thereof. Background technique [0002] At present, for the electric vehicle industry, high-nickel ternary lithium-ion batteries are the most competitive in the field, such as LiNi 0.8 co 0.1 mn 0.1 o 2 , has excellent energy density, but due to the increase of nickel content, the phenomenon of lithium-nickel mixed discharge is relatively more serious, resulting in the cycle stability and rate performance of the material being affected to varying degrees, and also resulting in high-nickel batteries. The specific capacity, cycle, stability, and rate performance cannot be balanced. How to improve the cycle performance and stability of high-nickel ternary lithium-ion batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525H01M4/36
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张宝王振宇
Owner ZHUJI PAWA NEW ENERGY
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