Preparation method of lithium ion battery ferric metasilicate lithium positive electrode material

A lithium ion battery, lithium iron silicate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unfavorable lithium iron silicate electrochemical performance, unfavorable battery volume energy density, large crystal grains and particles of materials, etc. Achieving the effect of excellent microstructure, excellent electrochemical performance and uniform distribution

Active Publication Date: 2010-08-18
CHERY AUTOMOBILE CO LTD
View PDF2 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the above synthesis methods, the traditional high-temperature solid-phase synthesis method requires a higher synthesis temperature, resulting in large grains and particles of the material, which is not conducive to the improvement of the electrochemical performance of lithium iron silicate, while the hydrothermal method and sol-gel method are difficult to industrialize application, and the density of the obtained powder material is low, which is not conducive to improving the volumetric energy density of the battery

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
  • Preparation method of lithium ion battery ferric metasilicate lithium positive electrode material
  • Preparation method of lithium ion battery ferric metasilicate lithium positive electrode material
  • Preparation method of lithium ion battery ferric metasilicate lithium positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The steps of the preparation method of the lithium-ion battery lithium iron silicate cathode material of the present embodiment are as follows: the basic raw material Li 2 CO 3 , FeC 2 o 4 2H 2 O, SiO 2 Mix in a molar ratio of 1:1:1, then add carbon source compound sucrose whose mass is 10% of the mass of the basic raw material and heat conduction agent acetylene black with a mass of 0.5% of the mass of the basic raw material, fully grind and mix with ethanol as a dispersant, and dry it in Press it into a block with a thickness of 1.5cm under a pressure of 10MPa, then place it in a crucible filled with activated carbon, then place the crucible in a microwave oven, and sinter at low heat for 5min to obtain a carbon-coated lithium iron silicate cathode material.

[0023] Such as figure 1 As shown in the curve A, the carbon-coated lithium iron silicate positive electrode material obtained in this embodiment is a single lithium iron silicate phase, and the crystallizat...

Embodiment 2

[0028] The steps of the preparation method of lithium iron silicate cathode material for lithium ion battery of the present embodiment are as follows: the basic raw materials LiOH, FeC 2 o 4 2H 2 O, SiO 2 Mix at a molar ratio of 2:1:1, then add 10% of the coating glucose as the mass of the basic raw material and 0.5% of the heat conduction agent activated carbon as the mass of the basic raw material, fully grind and mix with ethanol as a dispersant, and dry it at 10MPa Press it into a block with a thickness of 1.3 cm, place it in a crucible filled with activated carbon, place the crucible in a microwave oven, and sinter at low heat for 7 minutes to obtain a carbon-coated lithium iron silicate cathode material.

[0029] Such as figure 1 As shown in the curve B, the carbon-coated lithium iron silicate positive electrode material obtained in this embodiment is a single lithium iron silicate phase, and the crystallization performance of the product is good.

[0030] Such as ...

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
First discharge specific capacityaaaaaaaaaa
Login to view more

Abstract

The invention provides a preparation method of a lithium ion battery ferric metasilicate lithium positive electrode material, which comprises the following steps: A. mixing basic raw materials of lithium source compounds, iron source compounds and silicon dioxide according to a mol ratio of Fi : Fe : Si = 2 : 1 : 1, adding heat conducting agents which account for 2 to 40 percent of the total mass of the basic raw materials, and carrying out grinding; and B. pressing ground materials into blocks after drying, placing the blocks into a crucible provided with active carbon, and then, placing the crucible into microwaves for radiation heating for 2 to 30 minutes to obtain the ferric metasilicate lithium positive electrode material. The positive electrode material prepared by the preparation method of the lithium ion battery ferric metasilicate lithium positive electrode material has the excellent microstructure, the grains are fine and are uniformly distributed, and the electrochemical performance is excellent. The invention has the advantages of simple preparation technology, short flow process, easy operation and low equipment investment, and can be widely used for the production of various lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] Since Li / LiCoO 2 Since the industrialization of batteries, lithium-ion batteries have attracted widespread attention from all over the world due to their advantages such as high energy density, high discharge voltage, large specific capacity, low self-discharge rate, no memory effect and no pollution. Especially iron-based cathode materials are rich in resources. , cheap, non-toxic, environmentally friendly, good thermal stability, and high integrity. The currently used iron-based cathode materials mainly include lithium iron phosphate (LiFePO 4 ) and lithium iron silicate (Li 2 FeSiO 4 ). Since silicon is the most abundant element on earth, it is harmless to the environment and human beings, and Li 2 FeSiO 4 Compared to LiFePO...

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): H01M4/1397H01M4/58
CPCY02E60/122Y02E60/10
Inventor 朱广燕
Owner CHERY AUTOMOBILE 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