Method for preparing metal-silver-doped carbon-covering lithium iron phosphate of lithium-ion battery cathode material

A technology of carbon-coated lithium iron phosphate and positive electrode material, which is applied in electrode manufacturing, battery electrodes, circuits, etc. to achieve uniform particle size distribution, improved utilization, and improved electrical conductivity.

Active Publication Date: 2010-01-27
广州云通锂电池股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the prior art, there is no technology disclosed or used to prepare lithium iron phosphate by metal silver doping

Method used

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  • Method for preparing metal-silver-doped carbon-covering lithium iron phosphate of lithium-ion battery cathode material
  • Method for preparing metal-silver-doped carbon-covering lithium iron phosphate of lithium-ion battery cathode material
  • Method for preparing metal-silver-doped carbon-covering lithium iron phosphate of lithium-ion battery cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Step 1: Mix lithium hydroxide, diammonium hydrogen phosphate and silver oxide at a Li:P:Ag molar ratio of 1:1:0.00005, dissolve in distilled water, add 1g of citric acid and 1mL of ethylene glycol, and heat at 55°C Stirring under conditions to make a sol;

[0039] In the second step, in the first step sol, add glucose whose molar weight is 1 times the molar weight of the silver salt, react for 5 minutes, add ferrous oxalate equal to the molar number of the lithium salt and an equimolar amount based on pure carbon Acetylene black (Li:Fe:C=1:1:1, molar ratio), mixed evenly, vacuum-dried at 65°C for 12 hours, ball milled for 0.5 hour, and the ball-milled mixture powder was pressed into a square shape to obtain Precursors for the synthesis of lithium iron phosphate;

[0040] The third step is to place the precursor of the second step in a vacuum reaction furnace, react for 36 hours at a vacuum degree of about 1 Pa and 550 ° C, and ball mill to obtain metal silver-doped car...

Embodiment 2

[0043]The first step, lithium hydroxide, lithium acetate and lithium carbonate mixed in equimolar amounts, mixed with equimolar amounts of diammonium hydrogen phosphate, ammonium phosphate, and silver nitrate and silver oxide mixed in equimolar amounts by Li: P: Ag moles Mix at a ratio of 1:1:0.0001, dissolve in deionized water, add 2g of citric acid and 5mL of ethylene glycol, and stir at 60°C to make a sol;

[0044] In the second step, in the first step sol, add glucose whose molar weight is 2 times that of the silver salt molar weight, react for 55 minutes, add ferrous oxalate with a molar number equal to that of the lithium salt and an equimolar amount based on pure carbon The mixture of mixed acetylene black and activated carbon (Li: Fe: C = 1: 1: 1, molar ratio), mixed evenly, vacuum-dried at 125°C for 1 hour, ball milled for 5 hours, and the ball-milled mixture powder was pressed into Block type, made into a precursor for the synthesis of lithium iron phosphate;

[004...

Embodiment 3

[0048] The first step, lithium oxalate and lithium acetate mixed in equimolar amounts, mixed with equimolar amounts of diammonium hydrogen phosphate and ammonium phosphate and silver fluoride and silver oxide mixed in equimolar amounts, by Li: P: Ag molar ratio is 1 : Mix at a ratio of 1:0.0002, dissolve in distilled water, add 5g of citric acid and 10mL of ethylene glycol, and stir at 65°C to make a sol;

[0049] In the second step, in the first step sol, add glucose whose molar weight is 1.2 times of the silver salt molar weight, react for 50 minutes, add ferrous oxalate with the same molar number as the lithium salt molar number and an equivalent molar amount based on pure carbon A mixture of graphite and activated carbon (Li:Fe:C=1:1:1, molar ratio), mixed evenly, vacuum-dried at 120°C for 3 hours, ball milled for 4 hours, and the ball-milled mixture powder was pressed into cubes type, made into a precursor for the synthesis of lithium iron phosphate;

[0050] The third s...

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Abstract

The invention discloses a method for preparing metal-silver-doped carbon-covering lithium iron phosphate of lithium-ion battery cathode material, comprising steps: A. mixing lithium compound, phosphate and silver compound together according to the mole ratio of Li: P: Ag, and dissolving by water; sequentially adding citric acid and glycol, and stirring to prepare collosol; B. adding organic sugar with the molar weight of 1-2 times of that of silver salt into the collosol, adding iron compound with the mole number being the same as that of lithium salt and carbon reducing agent with the equal molar weight based on pure carbon, and evenly mixing, vacuum drying and ball-milling the mixture; then, pressing the mixture powder to be molded after ball-milling, and preparing precursor of synthesized lithium iron phosphate; C. putting the obtained precursor into a vacuum reaction furnace to have reaction under the condition of certain vacuum degree, and ball-milling to obtain the metal-silver-doped carbon-covering lithium iron phosphate LiFePO4 / Ag / C cathode material. The method has the advantages of simple technique, easy amplification, good electric conduction performance, excellent high-rate discharge performance, high specific capacity and electrochemistry efficiency, small particle size distribution range and high tap density.

Description

technical field [0001] The invention relates to the field of chemical power sources, and more specifically relates to a preparation method of metal silver-doped carbon-coated lithium iron phosphate, a positive electrode material of a lithium ion battery. The prepared metal silver-doped carbon-coated lithium iron phosphate cathode material can be used to manufacture various types of lithium-ion batteries, especially lithium-ion power batteries. Background technique [0002] The preferred battery for the development of electric vehicles is lithium-ion battery. Because lithium-ion batteries are a new generation of green and high-energy batteries, with many excellent characteristics such as high working voltage, high energy density, good electrochemical cycle performance, small self-discharge, no memory effect, and wide actual working temperature range. Lithium-ion batteries have been widely used in various electric tools, mobile phones, personal computers, digital equipment, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 李静刘巧周环波程凡詹炳然林定文林丽龚春丽
Owner 广州云通锂电池股份有限公司
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