Making method of anode material Li3V2(PO4)3 of high performance/price ration lithium ion battery

A technology for lithium-ion batteries and cathode materials, which is applied in the fields of electrochemistry and electronic products, can solve the problems of difficult synthesis and other problems, and achieve the effects of excellent electrochemical performance, good mixing effect, and good cycle stability

Inactive Publication Date: 2008-01-09
朱先军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

D Morgan et al [Chem.Mater., 14 (2002) 4684-4693.] with H 2 Reduction method, J Barker et al [J.Electrochem.Soc., 150(2003) A684-A688.] use carbon reduction method to synthesize Li 3 V 2 (PO 4 ) 3 , but because their synthesis is difficult to master, it is still in the stage of laboratory research

Method used

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  • Making method of anode material Li3V2(PO4)3 of high performance/price ration lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Accurately weigh LiOH.H 2 O 4.196 g, NH 4 VO 3 7.799 grams, (the mol ratio of Li / V is 3.00: 2) gets H 3 PO 4 6.287 milliliters, 14.009 grams of citric acid (citric acid / Li molar ratio is 2: 3.00); Dissolve citric acid in 400 milliliters of water, add NH under constant stirring 4 VO 3 , plus LiOH.H 2 O, followed by dropwise addition of H 3 PO 4 , adjust the pH value to 9 with ammonia water to make a sol, place the sol in a constant temperature water bath at 80°C, stir continuously, and evaporate the water to obtain a gel; dry at 100°C for 10 hours, and pre-prepare the dried gel at 300°C in air Decompose for 3 hours; grind, place the mixture in a high temperature sintering furnace at 8% H 2 +Ar in a mixed atmosphere, calcined at 800°C for 8 hours, cooled to room temperature, ball milled, and passed through a 300-mesh sieve to obtain Li 3 V 2 (PO 4 ) 3 Product; After testing, the carbon content of the product is 6%. Pack for later use.

Embodiment 2

[0017] Accurately weigh LiOH.H 2 O4.266 g, NH 4 VO 3 7.799 grams (the mol ratio of Li / V is 3.05: 2), get H 3 PO 4 6.287 milliliters, 28.018 grams of citric acid (citric acid / Li molar ratio is 4: 3.05); Dissolve citric acid in 400 milliliters of water, add NH under constant stirring 4 VO 3 , plus LiOH.H 2 O, followed by dropwise addition of H 3 PO 4 , adjust the pH value to 9 with ammonia water to make a sol, place the sol in a constant temperature water bath at 80°C, stir continuously, and evaporate the water to obtain a gel; dry at 100°C for 10 hours, and pre-prepare the dried gel at 300°C in air Decompose for 3 hours; grind, place the mixture in a high temperature sintering furnace at 8% H 2 +Ar in a mixed atmosphere, calcined at 700 °C for 16 hours, cooled to room temperature, ball milled, and passed through a 300-mesh sieve to obtain Li 3 V 2 (PO 4 ) 3 Product; After testing, the carbon content of the product is 15%. Pack for later use.

Embodiment 3

[0019] Accurately weigh Li 2 CO 3 3.756 g, NH 4 VO 3 7.799 grams (please press the molar ratio of Li / V to be 3.00:2), take H 3 PO 4 6.287 milliliters, 28.018 grams of citric acid (citric acid / Li molar ratio is 4: 3); Dissolve citric acid in 400 milliliters of water, add NH under constant stirring 4 VO 3 , plus LiOH.H 2 O, followed by dropwise addition of H 3 PO 4, adjust the pH value to 9 with ammonia water to make a sol, place the sol in a constant temperature water bath at 80°C, stir continuously, and evaporate the water to obtain a gel; dry at 100°C for 10 hours, and pre-prepare the dried gel at 400°C in air Decompose for 3 hours; grind, place the mixture in a high temperature sintering furnace at 8% H 2 +Ar in a mixed atmosphere, calcined at 900°C for 8 hours, cooled to room temperature, ball milled, and passed through a 300-mesh sieve to obtain Li 3 V 2 (PO 4 ) 3 Product; After testing, the carbon content of the product is 14%. Pack for later use.

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Abstract

The invention is concerned with a kind of preparation method of anode material Li3V2(PO4)3 to lithium ion cell with sol-gel and carbothermal reduction; combine technology. It takes lithium hydroxide or lithium carbonate, ammonium vanadate and phosphoric acid as raw material, citric acid as complexing agent with 3 to 3.05 :2 Li / V mol ratio and 2 to 4 : 3 to 3.05 citric acid / Li mol ratio. Put into water to get sol, vaporize the solvent to get gel, dry to get disaggrega-tire organic matter in advance in 300 to 400 degree air, then bake for 8 to 16 hours in Ar or N2 atmosphere containing H24-8 percent during 700 to 900 degree, cool and grind to get Li3V2(PO4)3 / C. This anode material has 132 mAh / g specific votume and 3.6 to 4.15 V work pressure with the range of 3 to 4.2 V pressure. Compared with LiCoO2, Li3V2(PO4)3 is advanced ion cell with high capability anode.

Description

technical field [0001] The invention relates to a high performance-price ratio lithium ion battery cathode material Li 3 V 2 (PO 4 ) 3 method of preparation. The invention belongs to the technical field of electrochemical and electronic product application. Background technique [0002] Lithium-ion batteries are currently the most advanced high specific energy chemical power sources, widely used in mobile communications, computers, video cameras, cameras, portable instruments and other fields, and can also be used as the preferred supporting power source for electric vehicles. Among them, the preparation of cathode materials is one of the key technologies in the development and manufacturing process of lithium-ion batteries. Therefore, people have invested a lot of manpower and material resources to study cathode materials with high specific capacity, high potential, low price, and no pollution. The most studied is LiCoO 2 , LiNiO 2 , LiMn 2 o 4 , LiNi x Mnt y co ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58H01M4/48C01B25/45
CPCY02E60/12Y02E60/10
Inventor 朱先军罗卫城董贤昌董学斌刘云霞
Owner 朱先军
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