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Lithium ion cell anode material lithium vanadium phosphate and preparation method thereof

A lithium-ion battery and cathode material technology, applied in the field of lithium vanadium phosphate material and its preparation, can solve the problem that the conductivity and high-rate discharge performance of lithium vanadium phosphate cathode material cannot meet the rate performance requirements of lithium-ion batteries, and the heating temperature and time are not easy Control, product purity can not be guaranteed and other issues, to achieve the effect of excellent rate discharge performance, excellent cycle stability, and low cost

Active Publication Date: 2008-03-19
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microwave method has short synthesis time and low energy consumption, but the product performance is affected because the heating temperature and time are not easy to control, and the purity of the product cannot be guaranteed
Moreover, the conductivity and high rate discharge performance of the lithium vanadium phosphate cathode materials synthesized by the above three methods cannot meet the rate performance requirements of high-power electrical appliances for lithium-ion batteries.

Method used

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  • Lithium ion cell anode material lithium vanadium phosphate and preparation method thereof
  • Lithium ion cell anode material lithium vanadium phosphate and preparation method thereof
  • Lithium ion cell anode material lithium vanadium phosphate and preparation method thereof

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preparation example Construction

[0030] The preparation method of lithium vanadium phosphate lithium ion battery cathode material of the present invention adopts the following steps:

[0031] 1. Preparation of nanoparticles: the water-insoluble lithium source compound, vanadium source compound, phosphorus source compound and complexing agent are processed into nano-sized particles through wet ultrafine ball milling; ball milling or crushing equipment is used, and the ball milling or crushing equipment is Stirring ball mill, sand mill, colloid mill, jet mill, impact micronizer, jet vortex mill, impact mill or rod mechanical mill.

[0032] 2. Liquid phase mixing reaction: weigh the lithium source compound and the vanadium source compound according to the ratio of the amount of substances Li:V:P:L (complexing agent)=(3.0~3.3):2:3:(1.5~2.2) , phosphorus source compound and complexing agent are dissolved in deionized water at 40-90°C, and stirred for 1-3 hours to obtain a mixed material; 40-90°C deionized water, ...

Embodiment 1

[0044] The raw materials lithium carbonate, ammonium metavanadate, and glucose were respectively pulverized by a circulating stirring ball mill until the particle size was on the order of nanometers, and lithium carbonate (Li 2 CO 3 ) 108.8 grams, ammonium metavanadate (NH 4 VO 3 ) 229.6 grams, phosphoric acid (H 3 PO 4 ) 339.4 grams and 353.2 grams of glucose were respectively dissolved in 400 milliliters of deionized water at 60° C., and stirred at a constant temperature for 3 hours; the glucose solution was first added to the phosphoric acid solution, then lithium carbonate and ammonium metavanadate solution were added successively, and stirred at a constant temperature of 60° C. for 2 Hours until the reaction of the mixed solution is complete and no bubbles are produced.

[0045] The above sample was ball milled (QM-1SP4 planetary ball mill) at a speed of 300r / min for 1 hour, spray-dried and granulated in a centrifugal spray granulation dryer at 100°C, and then placed th...

Embodiment 2

[0048] The raw materials lithium hydroxide, vanadium pentoxide, ammonium dihydrogen phosphate and citric acid were pulverized to the nanometer scale through ball milling, and lithium hydroxide (LiOH·H 2 O) 87.52 grams, vanadium pentoxide (V 2 o 5 ) 138.10 g, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 256.52 grams and citric acid 309.32 grams. Dissolve citric acid in 1700 ml of deionized water at 80°C and stir at constant temperature for 3 hours; mix lithium hydroxide, vanadium pentoxide and ammonium dihydrogen phosphate and ball mill for 0.5 hours at a speed of 300r / min, then add the mixture to lemon acid solution, stirred at 80°C for 3 hours until the reaction was complete.

[0049] The above sample was ball milled at a speed of 400r / min for 1 hour, spray-dried and granulated at 300°C, and then placed in a tube furnace under the protection of argon for 4 hours at 350°C, and cooled naturally to obtain Precursor of lithium vanadium phosphate.

[0050] The precursor o...

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Abstract

The invention discloses a lithium vanadium phosphate anode material used in a lithium battery and a preparation method thereof, and solves the technical problem that can improve the electrical conductivity and high-rate discharge property of the anode material. The inventive anode material comprises a matrix coated outside with a conductive nano-composite material with a particle size of 5-50 Mu m and a specific surface area of 5-25m<2> / g. The inventive anode material is prepared by the following steps: wet-method superfine ball mill, liquid-phase mixture reaction, spray drying, pretreatment, calcinations treatment, coating with conductive composite material, and fusion. Compared with the prior art, the invention can synthesize lithium vanadium phosphate anode material by the secondary molding liquid phase method of nanoparticles, and the product purity is high, the particle agglomeration is efficiently prevented. The synthetic lithium vanadium phosphate anode material has a discharge voltage about 4V, three discharge voltage platform zones, higher charge / discharge capacity, excellent rate discharge capability and loop stability, and low cost; and is suitable for the industrial production.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof, in particular to a lithium vanadium phosphate material with high conductivity and high rate performance and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy density, long cycle life and low self-discharge rate. Since Sony successfully realized the commercial production of lithium-ion secondary batteries in 1990, lithium-ion batteries have been widely used in various portable It also has great application prospects in electric vehicle (EV) and hybrid electric vehicle (HEV) power supplies in electronic products and mobile tools. At present, lithium-ion battery cathode materials mainly include lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate. Lithium cobalt oxide was the first to be used as a lithium-ion battery cathode material, and the technology is mature...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/62H01M4/04C01B25/45B22F1/02H01M4/136H01M4/1397
CPCY02E60/12Y02E60/10
Inventor 侯春平岳敏贺雪琴张万红
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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