Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of cobaltous oxide coated ternary anode material

A cathode material and cobalt oxide technology, which is applied in the field of preparation of cobalt oxide-coated ternary cathode materials, can solve problems such as poor processing performance, increased alkalinity of high-capacity ternary cathode materials, and material structure collapse.

Inactive Publication Date: 2017-03-22
WUXI JEWEL POWER & MATERIALS
View PDF4 Cites 43 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a method for preparing a cobalt oxide-coated ternary positive electrode material, which solves the corresponding increase in the alkalinity of the existing high-capacity ternary positive electrode material as the Ni content increases, and the resulting Poor processing performance, gas production caused by high-nickel materials, collapse or destruction of the material's own structure, etc.

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

Embodiment 1

[0019] A method for preparing a cobalt oxide-coated ternary positive electrode material, comprising the following steps:

[0020] NiSO 4 、CoSO 4 , MnSO 4 Dissolve in a certain amount of deionized water according to the molar ratio Ni:Co:Mn=7:1:2, and configure a mixed salt solution with a total concentration of metal ions of 1mol / L. Configure 2mol / L NaOH solution, and use a metering pump to input the NaOH solution into the mixed salt solution at a constant speed of 50mL / min for reaction. After complete addition, seal the reaction vessel, continue to stir and react at normal pressure and 30°C for 10h to obtain a co-precipitation reaction mixture, after solid-liquid separation, wash 3 times with deionized water, and vacuum-dry the filtrate at 120°C for 12h to obtain Ternary cathode material precursor.

[0021] LiOH·H 2 After O was vacuum-dried at 120°C for 5 hours, it was mixed with the precursor of the ternary cathode material in a mixer for 3 hours at a ratio of molar rat...

Embodiment 2

[0026] A preparation method of a cobalt oxide-coated ternary positive electrode material, the difference from Example 1 is that the cobalt oxide coating amount is the molar ratio Co: Li(Ni x co y mn 1-x-y )O 2 =0.04:1, other conditions are the same.

[0027] The cobalt oxide-coated high-capacity ternary positive electrode material obtained in this example was subjected to physical and chemical indicators, CR2016 button battery (3.0-4.3V, 0.2C charge and discharge) and 355071 soft-pack lithium-ion battery (3.0- 4.2V, 0.5C charge and discharge) test to study the comprehensive performance of the cathode material of the present invention.

[0028] Among them, the pH is 11.5; the test discharge capacity of the button battery is 186.0mAh / g, and the coulombic efficiency of the first charge and discharge is 85.8%; the test discharge capacity of the soft-packed lithium-ion battery is 179.2mAh / g; the inflation rate after high-temperature storage at 85°C / 4h was 16.5%.

Embodiment 3

[0030] A preparation method of a cobalt oxide-coated ternary positive electrode material, the difference from Example 1 is that the cobalt oxide coating amount is the molar ratio Co: Li(Ni x co y mn 1-x-y )O 2 =0.05:1, other conditions are the same.

[0031] The cobalt oxide-coated high-capacity ternary positive electrode material obtained in this example was subjected to physical and chemical indicators, CR2016 button battery (3.0-4.3V, 0.2C charge and discharge) and 355071 soft-pack lithium-ion battery (3.0- 4.2V, 0.5C charge and discharge) test to study the comprehensive performance of the cathode material of the present invention.

[0032] Among them, the pH is 11.42; the test discharge capacity of the button battery is 187.5mAh / g, and the coulombic efficiency of the first charge and discharge is 86.6%; the test discharge capacity of the soft-packed lithium-ion battery is 180.8mAh / g; the inflation rate after high temperature storage at 85°C / 4h was 8.7%.

[0033] From ...

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

No PUM Login to View More

Abstract

The invention belongs to the field of lithium ion batteries, and particularly relates to a preparation method of a cobaltous oxide coated ternary anode material. The cobaltous oxide coated ternary anode material is prepared through the steps of coprecipitation synthesis of a ternary anode material precursor, high-temperature sintering preparation of the ternary anode material, nanometer cobaltous oxide solid-phase coating and the like, so that the content of residual alkali on the surface of the anode material is reduced, the cycle performance and high-temperature safety performance are improved, and the preparation method is simple and practical and is high in practicability and universality.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a cobalt oxide-coated ternary positive electrode material. Background technique [0002] In recent years, power lithium-ion batteries have been greatly developed, and higher requirements have been put forward for their energy density and safety performance. There are two main ways to increase the energy density: 1) by increasing the charging upper limit voltage and optimizing the positive and negative electrode materials, thereby increasing the discharge capacity or mass energy density; 2) increasing the compaction density of the material to increase the volumetric energy density of the battery. The positive electrode material is the core key material of lithium-ion batteries. It is the bottleneck that hinders the improvement of the energy density of lithium-ion batteries. It is also an important determinant of the safety performance and ma...

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): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 唐朝辉马岩华钱飞鹏赵春阳
Owner WUXI JEWEL POWER & MATERIALS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com