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

Method for improving electrochemical properties of lithium iron phosphate with copper/graphene

A lithium iron phosphate battery, lithium iron phosphate technology, applied in electrochemical generators, circuits, electrical components, etc., can solve the problems of difficult control of the operation process, complicated steps, long time, etc., to improve the rate discharge performance and cycle stability. performance, simplicity of operation and process, high degree of binding and uniformity

Inactive Publication Date: 2015-11-11
SHANGHAI JIAO TONG UNIV
View PDF6 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method and steps of the composite material described in this technology are complicated, the energy consumption is large, the time is long, and the operation process is not easy to control; in the application of the lithium-ion battery involved, the expected effect is limited and the degree of improving the performance of the lithium-ion battery is not enough to meet the requirements. Power Battery Market Demand

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 improving electrochemical properties of lithium iron phosphate with copper/graphene
  • Method for improving electrochemical properties of lithium iron phosphate with copper/graphene
  • Method for improving electrochemical properties of lithium iron phosphate with copper/graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The present embodiment comprises the following steps: preparing 200mL of a mixed aqueous solution containing 0.01g of graphene oxide and 0.08g of copper sulfate; adding 2g of commercial carbon-coated lithium iron phosphate powder to the above mixed solution, and stirring at a speed of 180 rpm Stir for 2 minutes; wash the lithium iron phosphate powder after the above reaction with water, filter it with suction, and vacuum-dry it in a vacuum drying oven at -0.08MPa.

[0032] Such as figure 1 As shown, compared with the untreated lithium iron phosphate powder (a), the copper / graphene composite surface-treated lithium iron phosphate powder (b) has an obvious graphene layer on the surface, and the existence of copper element is detected by electron spectroscopy. That is, (b) has the dual morphology characteristics of chemically reduced graphene and copper.

[0033] Such as figure 2 with image 3 As shown, using N-methylpyrrolidone (NMP) as solvent, according to the mass ...

Embodiment 2

[0036] The present embodiment comprises the following steps: preparing 150mL of a mixed aqueous solution containing 0.2g of graphene oxide and 0.02g of copper chloride; adding 10g of commercial carbon-coated lithium iron phosphate powder to the above mixed solution, and stirring at a speed of 120 rpm Stir for 40 minutes; wash the lithium iron phosphate powder after the above reaction with water, filter it with suction, and vacuum-dry it in a vacuum drying oven at -0.08MPa.

[0037] The charge and discharge performance test was carried out on the lithium iron phosphate samples before and after treatment. The results of charge-discharge cycle test show that the specific capacity at 0.2C and 20C is about 147 and 75mAh / g, respectively.

Embodiment 3

[0039] The present embodiment comprises the following steps: preparing 100mL of a mixed aqueous solution containing 0.003g of graphene oxide and 0.04g of copper nitrate; adding 1g of commercial carbon-coated lithium iron phosphate powder to the above mixed solution, stirring at a stirring speed of 300 rpm 10min; the lithium iron phosphate powder after the above reaction was washed with water, filtered with suction, and placed in a -0.08MPa vacuum drying oven for vacuum drying.

[0040] The charge and discharge performance test was carried out on the lithium iron phosphate samples before and after treatment. The test results of charge-discharge cycles show that the specific capacities at 0.2C and 20C are about 155 and 69mAh / g, respectively.

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
diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a method for improving electrochemical properties of lithium iron phosphate with copper / graphene belonging to the technical field of manufacturing of lithium batteries. The chemical replacement reaction of copper and iron ions and the chemical reduction of oxidized graphene comprise : partial iron ions on the surface of the lithium iron phosphate are chemically replaced by copper ions in a copper salt to form a copper film; meanwhile, the oxidized graphene is reduced into the graphene; and a copper / graphene composite layer with electrical conductivity and corrosion resistance is formed on the surface of lithium iron phosphate powder in a treating fluid by once operation. The method is simple in operation process and technology; an organic solvent, a surfactant, a reducing agent and an oxidant does not need to be added in the production process of the composite layer, so that the production cost is low; and meanwhile, compared with simple mechanical mixing, atomic chemical reduction and replacement reaction attachment provided by the invention has higher combination degree and uniformity, so that the rate discharge property and the cycling stability of the lithium iron phosphate can be obviously improved.

Description

technical field [0001] The invention relates to a method in the technical field of lithium battery manufacturing, in particular to a method for improving the electrochemical performance of lithium iron phosphate by using copper / graphene. Background technique [0002] Lithium-ion batteries, which have developed rapidly in recent years, have become the research and development and application of secondary batteries because of their advantages such as high energy density, high output voltage, large output power, long service life, no memory effect, and low environmental pollution. hotspot. In the application of high-power power batteries, lithium iron phosphate (LiFePO 4 ) is the most promising cathode material for lithium-ion batteries. Compared with other cathode materials, LiFePO 4 High stability, safer and more reliable, low price and environmental protection. But LiFePO 4 When used in lithium-ion power batteries, there is a problem of poor "conductivity". It is impossi...

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): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/625H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 郭守武沈文卓王昌骏冯硕闫姣
Owner SHANGHAI JIAO TONG UNIV
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com