Cathode material Li3V2(PO4)3 of lithium ion battery and its making method

A technology for lithium-ion batteries and positive electrode materials, applied in the field of lithium vanadium phosphate materials and its preparation, can solve the problems of difficult control of heating temperature and time, unguaranteed product purity, short synthesis time by microwave method, etc., and achieve excellent cycle stability Sexuality, low cost, and the effect of preventing particle agglomeration

Active Publication Date: 2008-01-16
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
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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

Method used

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  • Cathode material Li3V2(PO4)3 of lithium ion battery and its making method
  • Cathode material Li3V2(PO4)3 of lithium ion battery and its making method
  • Cathode material Li3V2(PO4)3 of lithium ion battery and its making method

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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: respectively process non-water-soluble lithium source compounds, vanadium source compounds, phosphorus source compounds and complexing agents through wet ultra-fine ball milling to submicron or nanometer particles; ball milling or crushing equipment, ball milling or The pulverizing equipment is a stirring ball mill, a sand mill, a colloid mill, a jet pulverizer, an impact micropowder ball mill, a jet vortex micropowder machine, an impact pulverizer or a rod mechanical pulverizer.

[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 sti...

Embodiment 1

[0042] The raw materials lithium carbonate, ammonium metavanadate, and glucose are respectively pulverized by a circulating stirring ball mill to a particle size of submicron or nanometer order, and lithium carbonate (Li 2 CO 3 )54.4 grams, ammonium metavanadate (NH 4 VO 3 ) 114.8 g, phosphoric acid (H 3 PO 4 ) 169.7 grams and 176.6 grams of glucose were respectively dissolved in 150 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.

[0043] The above samples were added with 1wt.% ZrO 2 Afterwards, ball mill (QM-1SP4 planetary ball mill) at a speed of 300r / min for 1 hour, spray dry and granulate in a centrifugal spray granulation dryer at 1...

Embodiment 2

[0046] The raw materials lithium hydroxide, vanadium pentoxide, ammonium dihydrogen phosphate and citric acid were ball milled to submicron or nanoscale, and lithium hydroxide (LiOH·H 2 O) 48.76 grams, vanadium pentoxide (V 2 o 5 )69.05 grams, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 128.26 grams and citric acid 154.66 grams. Dissolve citric acid in 800 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 at 300r / min for 0.5 hours, then add the mixture to lemon acid solution, stirred at 80°C for 3 hours until the reaction was complete.

[0047] The above sample was mixed with 3wt.% Al 2 o 3 After mixing, ball mill at a speed of 400r / min for 1 hour, spray dry and granulate at 300°C, then place the product under the protection of argon and treat it in a tube furnace at 350°C for 4 hours, and obtain phosphoric acid after natural cooling Precursor of vanad...

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Abstract

The invention discloses a lithium-ion battery positive material-lithium vanadium phosphate, and the preparation method thereof, the main technical proposal is to enhance the purity of positive material and simplify the synthesizing method. The positive material in the invention is provided with a base body of lithium vanadium phosphate, carbon materials are coated outside the base body, the positive material is provided with some microscopic features like spheres, semi-spheres with the length of long axis and short axis of 5-30 micron, diamonds, cones, flakes, laminates and / or blocks, the size thereof is 5-30 micron, and the specific surface area is 5-15m2 / g. The preparation method includes preparing nano particles, liquid mixing reacting, preparing precursors, pretreament, activated roasting, coating the organic materials which can be carbonized, and then high-temperature processing. Compared with the prior art, by utilizing the nano particle secondary-molding liquid method for synthesizing the positive material-lithium vanadium phosphate, the invention simplifies operation processes and reduces production cost, with the positive material with higher charging-discharging capacity and excellent cyclical steady.

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 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 the 1990s, 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, but cobalt is a strategic resource. , res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/45B22F9/00B22F1/02B01J19/00
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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