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

LiFePO4/C anode material repaired and coated by AlPO4 and preparation method thereof

A technology of positive electrode materials and repair kits, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of high price of pyrrole, influence on the electrochemical performance of materials, poor thermal stability, etc., achieve simple process and improve high temperature cycle performance Effect

Active Publication Date: 2011-10-05
BEIJING UNIV OF CHEM TECH
View PDF1 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of pyrrole is higher and the thermal stability is poor; in addition, during the polymerization reaction of pyrrole, Fe 3+ As an oxidative polymerization inducer, if Fe cannot be completely removed 3+ ions, which will affect the electrochemical performance of the material

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
  • LiFePO4/C anode material repaired and coated by AlPO4 and preparation method thereof
  • LiFePO4/C anode material repaired and coated by AlPO4 and preparation method thereof
  • LiFePO4/C anode material repaired and coated by AlPO4 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 100g of LiFePO 4 / C and 1.538g of Al(NO 3 ) 3 9H 2 O powder was dispersed in 200mL of deionized water to prepare Al 3+Concentration of 0.02mol / L suspension, stirred for 30 minutes, and then added dropwise 100mL concentration of 0.04mol / L (NH 4 ) 2 HPO 4 Solution, continue to stir for 60 minutes, filter the obtained suspension, wash the reaction product with deionized water until the pH value of the filtrate is 7, dry the filter cake at 100 ° C for 8 hours, and then under the protection of nitrogen atmosphere, the reaction product Raise the temperature to 650°C at a rate of 1°C / min and keep the temperature constant for 2 hours, then naturally cool to room temperature to obtain a mass fraction of 0.5% AlPO 4 Repair coated LiFePO 4 / C cathode material.

[0022] X-ray powder diffractometer (XRD) was used to analyze LiFePO 4 / C original sample and present embodiment product are characterized, and the result is as follows figure 1 As shown, AlPO 4 Repair coated LiF...

Embodiment 2

[0024] 100g of LiFePO 4 / C and 3.845g of Al(NO 3 ) 3 9H 2 O powder dispersed in 200mL of deionized water, made into Al 3+ Concentration of 0.05mol / L suspension, stirred for 60 minutes, then dropwise added 100mL concentration of 0.125mol / L (NH 4 ) 2 HPO 4 Solution, continue to stir for 30 minutes, filter the obtained suspension, wash the reaction product with deionized water until the pH value of the filtrate is 6.5, dry the filter cake at 50 ° C for 6 hours, and then under the protection of nitrogen atmosphere, the reaction product is Raise the temperature to 500°C at a rate of 10°C / min and keep the temperature constant for 8 hours, then naturally cool to room temperature to obtain a mass fraction of 1.25% AlPO 4 Repair coated LiFePO 4 / C cathode material.

Embodiment 3

[0026] 100g of LiFePO 4 / C and 7.69g of Al(NO 3 ) 3 9H 2 O powder dispersed in 200mL of deionized water, made into Al 3+ The suspension with a concentration of 0.1mol / L was stirred for 90 minutes, and then 100mL of 0.3mol / L (NH 4 ) 2 HPO 4 Solution, continue to stir for 90 minutes, filter the obtained suspension, wash the reaction product with deionized water until the pH value of the filtrate is 7.5, dry the filter cake at 150 ° C for 4 hours, and then under the protection of nitrogen atmosphere, the reaction product is The temperature was raised to 800 °C at a rate of 5 °C / min and kept at a constant temperature for 5 hours, and then naturally cooled to room temperature to obtain a mass fraction of 2.5% AlPO 4 Repair coated LiFePO 4 / C cathode material.

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 provides a LiFePO4 / C anode material repaired and coated by AlPO4 and a preparation method thereof, belonging to the technical field of lithium ion battery electrode materials. The AlPO4 is used for repairing and coating areas which are not coated by carbon on the surfaces of LiFePO4 / C particles; and the mass of the AlPO4 is 0.5-2.5% of the mass of the LiFePO4 / C. The preparation method comprises the following steps: dispersing LiFePO4 / C powder and Al (NO3)3.9H2O powder in water to form a turbid liquid; dropwise adding an (NH4)2HPO4 water solution to the turbid liquid; and filtering, washing, drying and calcining to obtain the LiFePO4 / C anode material repaired and coated by AlPO4. The LiFePO4 / C anode material repaired and coated by AlPO4 has good high-temperature cyclical stability and is simple in preparation process as well as is suitable for industrial-scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery electrode materials, and in particular provides an AlPO 4 Repair coated LiFePO 4 / C cathode material and preparation method thereof. Background technique [0002] Olivine LiFePO 4 As a cathode material for lithium-ion batteries, it has the advantages of stable structure, high safety performance, abundant raw material sources, and no pollution to the environment. It is considered to be the preferred cathode material for power lithium-ion batteries. But LiFePO 4 The low electrical conductivity and poor high-temperature cycle performance seriously restrict the practical application of this material. Preparation of LiFePO by Carbon Coating Technology 4 / C material is improved LiFePO 4 effective means of electrical conductivity, while the carbon coating protects the LiFePO 4 Dissolve Fe from HF acid attack in electrolyte 2+ , so as to improve the cycle performance of the material, e...

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): H01M4/58H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 杨文胜陈立鹏刘海梅陈旭
Owner BEIJING UNIV OF CHEM TECH
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