SiO2-coated lithium ion battery positive electrode precursor material and preparation method thereof

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, electrolyte battery manufacturing, secondary batteries, etc., can solve the problems of secondary particle crystal structure rupture, secondary particle internal structure rupture, and material surface resistance increase. Improves stability, reduces anisotropic volume changes, and avoids cracking effects

Inactive Publication Date: 2020-03-13
CNGR ADVANCED MATERIAL CO LTD
View PDF9 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still problems such as poor interface stability and cracking of the internal structure of secondary particles in the market for lithium-ion battery cathode materials.
In the state of high delithiation, high-valent nickel ions are extremely easy to react with the electrolyte, releasing heat and gas, resulting in an increase in the surface impedance of the material, a rapid decline in cycle performance, and a deterioration in safety performance.
In addition, during the cycle of the battery, the anisotropic volume change caused by the phase transition causes the crystal structure of the secondary particles to break, and the electrolyte penetrates into the bulk phase through the cracks, causing the layered structure to transform into the rock-salt phase, which ultimately leads to electrochemical performance. attenuation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] The SiO 2 The preparation method of the positive electrode precursor material of coating lithium ion battery, comprises the following steps:

[0040] Change the chemical formula to Ni x co y m 1-x-y (OH) 2 The compound reacts with the silicon source and is hydrolyzed to obtain Ni coated on the silica gel. x co y m 1-x-y (OH) 2 , washed with water, dried and then calcined to obtain the SiO 2 Coated cathode precursor material for lithium-ion batteries.

[0041] In some preferred embodiments of the present invention, the temperature of the water washing is 40-60°C, more preferably 40-50°C.

[0042] In some preferred embodiments of the present invention, the hydrolysis temperature is 30-45°C, preferably 35-45°C, and the reaction time is 3-5h, preferably 4-5h.

[0043] In some preferred embodiments of the present invention, the drying method is adopted, and the temperature of the drying is 50-60°C, more preferably 55-60°C.

[0044] In some preferred embodiments of...

Embodiment 1

[0058] A kind of SiO provided by this embodiment 2 A coated lithium-ion battery cathode precursor material, the preparation method of which comprises:

[0059] Change the chemical formula to Ni x co y Al 1-x-y (OH) 2 The compound reacts with the silicon source and is hydrolyzed to obtain Ni coated on the silica gel. x co y Al 1-x-y (OH) 2 , washed with water, dried and then calcined to obtain the SiO 2 The coated lithium-ion battery positive electrode precursor material has a particle size range of 5-15 μm.

[0060] Wherein, the temperature of water washing is 40-60 ℃;

[0061] The temperature of the reaction system is 30-45°C, and the reaction time is 3-5h;

[0062] The drying adopts a drying method, and the drying temperature is 50-60°C.

[0063] Among them, Ni x co y Al 1-x-y (OH) 2 The preparation method of compound material, comprises the following steps:

[0064] (1) Dissolving nickel sulfate and cobalt sulfate in pure water according to the ratio of meta...

Embodiment 2

[0073] A kind of SiO provided by this embodiment 2 A coated lithium-ion battery cathode precursor material, the preparation method of which comprises:

[0074] Change the chemical formula to Ni x co y mn 1-x-y (OH) 2 The compound reacts with the silicon source and is hydrolyzed to obtain Ni coated on the silica gel. x co y mn 1-x-y (OH) 2 , washed with water, dried and then calcined to obtain the SiO 2 The coated lithium ion battery positive electrode precursor material has a particle size range of 8-12 μm.

[0075] Wherein, the temperature of water washing is 40-60 ℃;

[0076] The temperature of the reaction system is 30-45°C, and the reaction time is 3-5h;

[0077] The drying adopts a drying method, and the drying temperature is 50-60°C.

[0078] Among them, Ni x co y mn 1-x-y (OH) 2 The preparation method of compound material, comprises the following steps:

[0079] (1) Dissolve nickel nitrate, cobalt nitrate, and manganese nitrate in pure water according to...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention provides a SiO2-coated lithium ion battery positive electrode precursor material and a preparation method thereof, the SiO2-coated lithium ion battery positive electrode precursor material comprises a core and a SiO2 coating layer at least partially coating the surface of the core,a chemical structural formula of the core is NixCoyM1-x-yO, and M is selected from Mn or Al. The SiO2-coated lithium ion battery positive electrode precursor material has the advantages of higher unit metal content, larger specific surface area and the like, so that the lithium mixing effect in the sintering process of the material is better. The prepared positive electrode material is a compound lithium ion positive electrode material with more uniform morphology and better consistency, and is morebeneficial to the long cycle performance and high rate performance of the positive electrode material. The SiO2 coating layer improves the stability of the material, reduces the anisotropic volume change caused by phase change in the cycle process of the battery, and avoids the rupture of the internal structure of secondary particles.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery preparation, in particular to a SiO 2 The coated lithium-ion battery cathode precursor material and its preparation method also include lithium-ion battery cathode materials and lithium-ion batteries. Background technique [0002] In recent years, due to the advantages of high specific energy, small self-discharge, high open circuit voltage, no memory effect, long cycle life, and no environmental pollution, lithium-ion batteries have been widely used in consumer electronics markets such as mobile phones, notebook computers, digital cameras, and electric vehicles. has been widely popularized. [0003] Lithium-ion batteries are mainly composed of positive electrode, negative electrode, electrolyte, separator and other components. At present, there are still problems such as poor interface stability and cracking of the internal structure of secondary particles in the market for lithium-...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/505H01M10/0525H01M10/058
CPCH01M4/366H01M4/48H01M4/485H01M4/505H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 伍兴科訚硕朱艳张勤张雨英
Owner CNGR ADVANCED MATERIAL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap