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A kind of preparation method of positive electrode material of lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., to achieve good rate performance and excellent cycle performance

Active Publication Date: 2015-08-12
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Searching patents, no related patents have been found to prepare copper-coated lithium iron phosphate materials by reacting primary lithium with copper mirrors

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  • A kind of preparation method of positive electrode material of lithium ion battery
  • A kind of preparation method of positive electrode material of lithium ion battery
  • A kind of preparation method of positive electrode material of lithium ion battery

Examples

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Embodiment 1

[0028] Dissolve lithium dihydrogen phosphate and ferrous nitrate in an appropriate amount of deionized water at a molar ratio of Li:Fe=1:1 to prepare solution A with a concentration of 3mol / L; use 1% copper sulfate and 1% Prepare Fehling's reagent with sodium hydroxide; slowly drop A solution into Fehling's reagent according to the ratio of Fe:Cu=10:1, and then adjust the pH value of the solution to 9 with ammonia water; slow down the concentration of 20% formaldehyde solution Add the above solution with a pH value of 9, and perform magnetic stirring at 70°C to form a precursor; after simply grinding the precursor, put it into a tube furnace protected by argon for sintering, and the sintering temperature is 300°C , the sintering time is 3 hours, and the pretreated powder is obtained; the pretreated powder is then sintered in a tube furnace with a mixed protective gas of argon and hydrogen, and the sintering temperature is 900°C (heating rate 10°C / min), and the sintering The ti...

Embodiment 2

[0030] Dissolve lithium phosphate and ferrous oxalate in an appropriate amount of deionized water at a molar ratio of Li:Fe=1:1 to prepare solution A with a concentration of 0.1mol / L; use 7% copper sulfate and 10% hydrogen Prepare Fehling's reagent with sodium oxide; slowly drop A solution into Fehling's reagent according to the ratio of Fe:Cu=100:1, and then adjust the pH value of the solution to 10 with ammonia water; slowly drop 40% formaldehyde solution Add the above solution with a pH value of 10, and carry out magnetic stirring at 90°C to form a precursor; after simply grinding the precursor, put it into a tube furnace with nitrogen protection for sintering, the sintering temperature is 450°C, and the sintering The time is 10 hours, and the pretreated powder is obtained; the pretreated powder is then sintered in a tube furnace with a mixed protective gas of nitrogen and hydrogen. Hours, the temperature is lowered by liquid nitrogen quenching and cooling, and 0.16wt% copp...

Embodiment 3

[0032] Dissolve lithium dihydrogen phosphate and ferrous acetate in a molar ratio Li:Fe=1:1 in an appropriate amount of deionized water to prepare solution A with a concentration of 1mol / L; use 5% copper sulfate and 10% Prepare Fehling's reagent with sodium hydroxide; slowly drop A solution into Fehling's reagent according to the ratio of Fe:Cu=50:1, and then adjust the pH value of the solution to 9 with ammonia water; slow down the concentration of 35% formaldehyde solution The above solution with a pH value of 9 was added dropwise, and magnetically stirred at 80°C to form a precursor; after the precursor was simply ground, it was put into a tube furnace with nitrogen protection for sintering, and the sintering temperature was 400°C. The sintering time was 5 hours to obtain the pretreated powder; the pretreated powder was then sintered in a tube furnace with a mixed protective gas of nitrogen and hydrogen, the sintering temperature was 850°C (heating rate 15°C / min), and the si...

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Abstract

The invention relates to a preparation method for a low-cost high-electrical conductivity lithium ion battery positive pole material. The method is characterized by comprising the following steps: dissolving soluble phosphate and Fe salt in deionized water according to stoichiometric ratio, so as to prepare a 0.1-3 mol / L solution A; dripping a 1-7 percent cupric sulfate solution in a 1-10 percent sodium hydroxide solution to obtain a transparent fehling reagent solution; slowly dripping the solution A into the fehling reagent solution to form a solution B; slowly dripping 20-40 percent formalin into the solution B, performing magnetic agitating at the temperature of 70-90 DEG C to form a powdered precursor for grinding and reserving; putting the precursor into a pipe furnace filled with inert or reducing gas for pre-processing sintering so as to obtain the pre-processing powder; allowing the pre-processing powder in the pipe furnace filled with the inert or reducing gas to be subjected to sintering again, thereby obtaining a copper clad ferrous phosphate lithium material. The prepared material is high in electric conductivity, and multiplying power performance and circulating stability of the ferrous phosphate lithium material can be improved very conveniently.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material of a lithium ion battery, in particular to a method for preparing a copper-coated lithium iron phosphate positive electrode material with low cost and high conductivity, and belongs to the technical field of positive electrode materials for lithium ion batteries. Background technique [0002] Lithium-ion secondary batteries have been widely used in many fields such as portable electronic devices since their commercialization, and LiCoO 2 Due to the advantages of high voltage and stable electrochemical performance, it occupies an important position in the market. However, Co resources are relatively scarce and expensive, which limits its application. [0003] In recent years, a class of cathode materials with polyanionic structures has attracted extensive attention. Among them, lithium iron phosphate (LiFePO 4 ) is the earliest known positive electrode material with a polya...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/10
Inventor 姜涛陈慧明张克金米新艳安宇鹏
Owner CHINA FIRST AUTOMOBILE
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