Method for synthesizing LiFePO4/C positive material of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of no longer obvious advantages in synthesis, and achieve the effect of simplifying the experimental process, easy control of conditions, and convenient industrialized large-scale production

Inactive Publication Date: 2014-08-27
SHANDONG GOLDENCELL ELECTRONICS TECH
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These deficiencies offset the synthetic advantages of this method, making the synthetic advantages of this method no longer obvious

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 synthesizing LiFePO4/C positive material of lithium ion battery
  • Method for synthesizing LiFePO4/C positive material of lithium ion battery
  • Method for synthesizing LiFePO4/C positive material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh LiOH·H at a molar ratio of 3:1 2 O and H 3 PO 4 Each was dissolved in distilled water to form 3 mol / L and 1 mol / L solutions for use; first, 0.5 ml of aniline was added to the phosphoric acid solution; secondly, the completely dissolved lithium hydroxide solution was added to the above mixture , instantly generating white Li 3 PO 4 precipitation; again, FeSO containing a small amount of ascorbic acid 4 ·7H 2 O solution (with H 3 PO 4 same number of moles) was dropped into the above system; after stirring for 5 min, it was transferred to the reaction kettle, N 2 After bubbling for 10 min, put it directly into a blast drying oven at 180 °C for 2 h, take out the reaction kettle and cool it down to room temperature, wash the precipitate obtained by centrifugation with distilled water several times, then wash it twice with absolute ethanol, and then put it in 60 °C oven, after drying, LiFePO 4 / PANI powder, LiFePO 4 / PANI powder was placed in a tube furnace at...

Embodiment 2

[0036] Weigh LiOH·H at a molar ratio of 3:1 2 O and H 3 PO 4 Each was dissolved in distilled water to form 3 mol / L and 1 mol / L solutions for use; first, 0.5 ml of aniline was added to the phosphoric acid solution; secondly, the completely dissolved lithium hydroxide solution was added to the above mixture , instantly generating white Li 3 PO 4 precipitation; again, FeCl containing a small amount of ascorbic acid 2 4H 2 O solution (with H 3 PO 4 same number of moles) was dropped into the above system; after stirring for 5 min, it was transferred to the reaction kettle, N 2 Bubbling for 10 min, then directly put it into a blast drying oven at 180 °C for 2 h, take out the reaction kettle and cool it down to room temperature, wash the precipitate obtained by centrifugation with distilled water several times, then put it in a 60 °C oven, and dry it to obtain LiFePO 4 / PANI powder, LiFePO 4 / PANI powder was placed in a tube furnace at 500 °C under N 2 Sintered under the at...

Embodiment 3

[0038] Weigh LiOH·H at a molar ratio of 3:1 2 O and H 3 PO 4 Each was dissolved in distilled water to form 3 mol / L and 1 mol / L solutions for use; first, 1ml of aniline was added to the phosphoric acid solution; secondly, the completely dissolved lithium hydroxide solution was added to the above mixed solution, Instantly generates white Li 3 PO 4 precipitation; again, FeSO containing a small amount of ascorbic acid 4 ·7H 2 O solution (with H 3 PO 4 The same number of moles) was dropped into the above system. After stirring for 5 min, transfer to the reaction kettle, N 2 Bubbling for 10 min, then directly put it into a blast drying oven at 180 °C for 2 h, take out the reaction kettle and cool it down to room temperature, wash the precipitate obtained by centrifugation with distilled water several times, then put it in a 60 °C oven, and dry it to obtain LiFePO 4 / PANI powder, LiFePO 4 / PANI powder was placed in a tube furnace at 600 °C under N 2 Sintered under the atmo...

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 hydrothermal synthesis method of a LiFePO4 / C positive material of a lithium ion battery. The method comprises the following steps: respectively weighing a lithium salt and a phosphate salt according to the molar ratio of 3:1 and respectively dissolving in distilled water so as to respectively form 3mol / L of lithium salt solution and 1mol / L of phosphate salt solution for later use; adding aniline into the phosphate salt solution obtained in the step (1); secondly, adding the completely dissolved lithium salt solution into a mixed solution of the aniline and the phosphorus salt so as to instantaneously generate a white Li3PO4 precipitate; dripping an iron salt solution containing an antioxidant into the system obtained in the step (2); stirring the solution obtained in the step (3) and then transferring into a reaction kettle, washing the precipitate obtained in a separating manner in the distilled water, then putting an drying oven at 60 DEG C for drying and obtaining LiFePO4 / PANI powder after the drying; and cooling the LiFePO4 / PANI powder to a room temperature so as to obtain the LiFePO4 / C anode material.

Description

technical field [0001] The invention relates to a method for synthesizing the positive electrode material of lithium ion battery, in particular to a method for synthesizing the positive electrode material of lithium ion battery LiFePO 4 / C method. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) has the advantages of rich raw materials, green environmental protection, low price, high specific capacity (170 mAh / g), good platform characteristics, and excellent overcharge resistance. It is recognized as the most promising cathode material for lithium-ion batteries. However, lithium iron phosphate itself is a semiconductor, and its intrinsic electronic conductivity is poor (about 10 -9 S / cm level), the diffusion rate of lithium ions is low (about 10 -11 S / cm level), these deficiencies seriously limit the electrochemical performance of the cathode material lithium iron phosphate. Poor electronic conductivity will produce a large ohmic voltage drop during cha...

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): H01M4/58H01M4/62
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 关成善宗继月孟博王晓卫
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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