Nickel-based material, preparation method of nickel-based material, and lithium ion battery

A nickel-based, core material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of weak conductivity and large interface transfer resistance, and achieve the effects of good bonding, reducing interface resistance and inhibiting corrosion.

Inactive Publication Date: 2017-06-20
四川浩普瑞新能源材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the substances commonly used to coat nickel-rich cathode materials are mainly Al 2 o 3 , ZrO 2 、TiO 2 , ZnO and LiAlO 2 These coating substances can improve the interface structure of the material to a certain extent and obtain better electrochemical performance, but there is also an obvious problem that the coating material itself is an ionic insulator or has relatively low ion conductivity. Weak, so it will have a certain degree of influence on the interfacial transport of lithium ions, resulting in problems such as large interfacial transport resistance

Method used

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  • Nickel-based material, preparation method of nickel-based material, and lithium ion battery
  • Nickel-based material, preparation method of nickel-based material, and lithium ion battery
  • Nickel-based material, preparation method of nickel-based material, and lithium ion battery

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preparation example Construction

[0041] The application provides a method for preparing the above-mentioned nickel-based material, comprising the following steps:

[0042] A), mixing oxysilane with an organic solvent, then adjusting the pH value of the obtained solution, and obtaining a coating solution after reaction;

[0043] B), mixing the coating solution with the precursor material shown in formula (II), stirring to obtain SiO 2 The initial nickel-based material for the gel-coated precursor material;

[0044] C), mixing the initial nickel-based material with a lithium salt and performing a high-temperature solid-state reaction to obtain a nickel-based material;

[0045] Ni 1-a-b co a m b (OH) 2 (II);

[0046] Among them, 0≤a<1, 0≤b<1, 0<1-a-b<1;

[0047] M is selected from Mn or Al.

[0048] In the process of preparing nickel-based materials, including the preparation of coating solution, SiO 2 The initial nickel-based material of the gel-coated precursor material and the preparation of the nic...

Embodiment 1

[0055] According to the fast lithium-ion conductor phase Li 4 SiO 4 The mass ratio of the coating amount and the nickel-based precursor material is the addition amount of 0.01:1, and 0.37g ethyl orthosilicate is dissolved in the mixed solvent system containing deionized water and ethanol, wherein the volume of deionized water and ethanol The ratio is 2:1, the volume ratio of tetraethyl orthosilicate and mixed solvent is 1:3, the pH value of the system is adjusted to 8.0 with ammonia water, the reaction temperature of the system is controlled at 40°C, and the stirring speed is controlled at 300 rpm. After the silicon salt was hydrolyzed and polycondensed for 1 hour, then ethanol was added to dilute and disperse to obtain 60 g of coating liquid, and milky white micro-dispersed colloidal particles appeared in the coating liquid;

[0056] The commercial nickel-rich precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 Add it into the above coating solution, the mass ratio of the precursor to...

Embodiment 2

[0063] According to the fast lithium-ion conductor phase Li 4 SiO 4 The mass ratio of coating amount and nickel-based precursor material is the addition amount of 0.015:1, and 0.48g methyltriethoxysilane is added in the isopropanol solvent, methyltriethoxysilane and isopropanol The volume ratio of the solvent is 1:4, the pH value of the system is adjusted to 9.0 with ammonia water, the reaction temperature of the control system is 50°C, and the stirring speed is controlled at 400 rpm. Dilute and disperse with ionic water to obtain 80g of coating liquid, which contains milky white micro-dispersed colloidal particles;

[0064] The commercial precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 Add it to the above coating solution, the mass ratio of the positive electrode material precursor to the coating solution is 1:4, keep stirring at a stirring speed of 400 rpm, and after the solvent is volatilized, place it in an oven at 100°C for complete drying. The hydrolyzate nano-scale SiO was ...

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Abstract

The invention provides a nickel-based material. The nickel-based material comprises a core material represented by the FORMULA (I) and a Li<4>SiO<4> coating layer coated on the surface of the core material. The invention further provides a preparation method of the nickel-based material. The preparation method of the nickel-based material comprises the following steps of: mixing methyl silane with an organic solvent, then, adjusting the pH value, and reacting to obtain coating liquid; mixing the coating liquid with a precursor material represented by the FORMULA (II) to stir, so that an initial nickel-based material is obtained; and, performing high-temperature solid-phase reaction after mixing the initial nickel-based material with lithium salt, so that the nickel-based material is obtained. Li<4>SiO<4> is coated on the surface of the core nickel-based material; the obtained nickel-based material is used as the cathode material; and thus, a lithium ion battery has better cycle performance and rate capability.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a nickel-based material, a preparation method thereof and a lithium-ion battery. Background technique [0002] Among many secondary battery systems, lithium-ion batteries have many advantages such as high working voltage, high energy density and no memory effect, and are widely used in portable mobile electronic products such as mobile phones and notebook computers and electric vehicles. As one of the core components of lithium-ion batteries, cathode materials determine the performance of lithium-ion batteries to a large extent. [0003] Nickel-rich positive electrode materials, especially nickel-cobalt lithium manganate ternary composite materials, combine the performance advantages of lithium cobaltate, lithium nickelate and lithium manganate, and have the characteristics of high specific capacity, long cycle life and good safety performance. , is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/58H01M4/36H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 贺天江王飞周宏祥石迪辉唐世国周少江
Owner 四川浩普瑞新能源材料股份有限公司
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