Method for preparing lithium iron phosphate and lithium nickel cobalt manganese oxide composite cathode material

A composite cathode material, lithium nickel cobalt manganate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor electrochemical performance, poor electronic conductivity, high temperature performance defects, etc., to improve overcharge and discharge performance. , Improve the cycle performance, the effect of no pollution to the environment

Active Publication Date: 2015-02-25
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
View PDF5 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor electronic conductivity of lithium iron phosphate is well known, and the rechargeable voltage is relatively low. The electrochemical performance of the lithium iron phosphate lithium battery produced is poor; the shortcoming of low stacking density of lithium iron phosphate has been ignored and avoided by people. be resolved, hindering the practical application of the material
The ternary material has excellent electrochemical performance, high energy density, high vol

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing lithium iron phosphate and lithium nickel cobalt manganese oxide composite cathode material
  • Method for preparing lithium iron phosphate and lithium nickel cobalt manganese oxide composite cathode material
  • Method for preparing lithium iron phosphate and lithium nickel cobalt manganese oxide composite cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0016] Using lithium iron phosphate and lithium nickel cobalt manganese oxide as positive electrode materials, the mass ratio of lithium iron phosphate to lithium nickel cobalt manganese oxide is 1:9, weigh 14.40g of lithium nickel cobalt manganese oxide and 1.60g of lithium iron phosphate and Mix 1.00g of acetylene black, dry ball mill for 30min, separate them after ball milling, then stir the two for pre-mixing, then add a certain amount of alcohol and stir evenly, then ball mill for 30min, then take out, dry and pulverize to obtain iron phosphate Composite cathode material of lithium and nickel-cobalt-lithium manganese oxide. Weigh 0.06g of binder PVDF, then add dropwise 0.9898g ~ 1.1589g of nitrogen methyl pyrrolidone to dissolve it into a solution with no bubbles, then weigh 0.54g of composite positive electrode material, add it to the solution, and stir The positive electrode slurry was made in two hours, and the slurry was evenly coated on the aluminum foil, dried to ma...

Embodiment example 2

[0018] Lithium iron phosphate and lithium nickel cobalt manganese oxide are used as positive electrode materials, and the ratio of lithium iron phosphate to lithium nickel cobalt manganese oxide is 2:8. The experimental steps are the same as the implementation case 1.

Embodiment example 3

[0020] Lithium iron phosphate and lithium nickel cobalt manganese oxide are used as positive electrode materials, the ratio of lithium iron phosphate to lithium nickel cobalt manganese oxide is 3:7, and the experimental steps are the same as the implementation case 1.

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 relates to a method for preparing a lithium iron phosphate and lithium nickel cobalt manganese oxide composite cathode material. The method comprises the following steps: cathode active materials, including lithium iron phosphate and lithium nickel cobalt manganese oxide, are respectively mixed with a conductive agent to obtain a mixture, ball-milling is performed on the two mixtures, pre-coating is performed, the two pre-coated mixtures are mixed to obtain a mixture, then dry or wet ball-milling is performed, and then the mixture is dried, crushed and graded so as to obtain the surface-coated lithium iron phosphate and lithium nickel cobalt manganese oxide composite cathode material. By adopting the method provided by the invention, the cycle performance of a lithium nickel cobalt manganese oxide lithium-ion battery can be improved, the over-charging and over-discharging problem of the battery is solved, and the service life of the battery can be prolonged. The cathode material is formed by mixing lithium iron phosphate and lithium nickel cobalt manganese oxide, no new material needs to be prepared, only these two cathode materials need to be mixed evenly, and therefore no cost is increased obviously.

Description

technical field [0001] The invention relates to a method for making a lithium-ion battery composite cathode material, belonging to the technical field of chemical power sources. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, small size, light weight, no memory effect, no pollution, small self-discharge and long cycle life, and are ideal energy carriers for development in the 21st century. Lithium-ion batteries are widely used in energy storage power systems such as water conservancy, thermal power, wind power and solar power stations, uninterruptible power supplies for post and telecommunications, and power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, aerospace and other fields At the same time, lithium-ion batteries have been widely used in portable electrical appliances such as laptops, cameras, and mobile communications due to their unique performance advantages; the developed larg...

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
IPC IPC(8): H01M4/36
CPCH01M4/364Y02E60/10
Inventor 陈召勇彭南发许炼欧潘连陈孝邢鹏朱华丽
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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