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A kind of preparation method of lithium-ion battery cathode material with high conductivity

A technology of lithium ion battery and positive electrode material, applied in battery electrodes, circuits, electrical components, etc., to achieve excellent cycle performance, uniform distribution, and good rate performance.

Active Publication Date: 2016-06-22
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Searching patents, no relevant patents have been found for preparing silver-coated lithium iron phosphate materials by reacting primary lithium with silver mirrors

Method used

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  • A kind of preparation method of lithium-ion battery cathode material with high conductivity
  • A kind of preparation method of lithium-ion battery cathode material with high conductivity
  • A kind of preparation method of lithium-ion battery cathode material with high conductivity

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Embodiment 1

[0024] Dissolve lithium dihydrogen phosphate and iron nitrate in an appropriate amount of deionized water at a molar ratio of Li:Fe=1:1 to prepare a solution with a concentration of 3mol / L; drop silver nitrate solution with a concentration of 5% into the concentration In a 20% ammonia solution, a silver ammonia solution is formed; the above 3mol / L solution is slowly dropped into the silver ammonia solution according to the ratio of Fe:Ag=20:1, and then the pH value of the solution is adjusted to 9.5 by ammonia water; Glucose solution with a concentration of 30% is slowly dripped into the above solution with a pH value of 9.5, and the molar ratio of glucose to silver is controlled to be 1:1, and then at 80 o Magnetic stirring was carried out under C to form the precursor; after the precursor was simply ground, it was put into a tube furnace protected by argon for sintering, and the sintering temperature was 300 o C, the sintering time is 4 hours, and the pretreatment powder is ...

Embodiment 2

[0026] Dissolve lithium dihydrogen phosphate and iron acetate in a molar ratio Li:Fe=1:1 in an appropriate amount of deionized water to prepare a solution with a concentration of 3.5mol / L; drop a 4% silver nitrate solution into the In the ammonia solution with a concentration of 15%, a silver-ammonia solution is formed; the above 3.5mol / L solution is slowly dropped into the silver-ammonia solution according to the ratio of Fe:Ag=50:1, and then the pH value of the solution is adjusted to 9 by ammonia water ; Slowly drip the glucose solution with a concentration of 35% into the above solution with a pH value of 9, and control the molar ratio of glucose to silver to be 1.2:1, then at 85 o C under magnetic stirring to form a precursor; after grinding the precursor, put it into a tube furnace with argon protection for sintering, the sintering temperature is 350 o C, the sintering time is 3 hours, and the pretreatment powder is obtained; the pretreatment powder is then sintered in a...

Embodiment 3

[0028] Dissolve lithium dihydrogen phosphate and ferric nitrate in deionized water at a molar ratio of Li:Fe=1:1 to prepare a solution with a concentration of 6mol / L; drop silver nitrate solution with a concentration of 4.5% into the solution with a concentration of 35 % ammonia solution to form a silver ammonia solution; the above 4.5mol / L solution is dripped into the silver ammonia solution according to the ratio of Fe:Ag=76:1, and then the pH value of the solution is adjusted to 9.7 by ammonia water; the concentration is 21.5% glucose solution is slowly dripped into the above solution with a pH value of 9.7, and the molar ratio of glucose to silver is controlled to be 1.5:1, and then at 90 o Stirring at C to form a precursor; after grinding the precursor, put it into a tube furnace filled with argon and nitrogen (volume ratio 1:1) gas mixture for sintering, the sintering temperature is 320 o C, the sintering time is 4 hours, and the pretreatment powder is obtained; the pret...

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Abstract

The invention relates to a preparation method of a high-conductivity lithium-ion battery cathode material, which is characterized in that the preparation method comprises dissolving soluble phosphate and Fe salt in deionized water according to the molar ratio Li:Fe=1:1, and utilizing the silver content of glucose According to the principle of mirror reaction, the lithium iron phosphate material with surface silver coating is prepared. Glucose not only plays the role of carbon source in the reaction process, but also is an important raw material for silver mirror reaction. The material has high conductivity, which is very beneficial Improve the rate performance and cycle stability of lithium iron phosphate materials.

Description

technical field [0001] The invention relates to a preparation method of a high-conductivity lithium-ion battery cathode material, belonging to the technical field of lithium-ion battery cathode materials. Background technique [0002] The performance of lithium-ion batteries depends to a large extent on the cathode materials used, and the selection of cathode materials directly affects the various indicators of lithium-ion batteries. Traditional lithium-ion battery positive electrode materials are mainly transition metal oxide materials. Due to the mixed valence state of transition metal oxides, they all have relatively ideal electronic conductivity. At present, the most studied transition metal oxide cathode materials mainly include LiCoO 2 , LiNiO 2 、LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 and LiMn 2 o 4 Wait for a few. [0003] In recent years, a class of cathode materials with polyanionic structures has attracted extensive attention. Among them, lithium iron phosphate (LiFe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 姜涛陈慧明赵中令王丹安宇鹏王金兴常潇然韩金磊张斌曹婷婷
Owner CHINA FIRST AUTOMOBILE
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