Method for preparing flaky lithium vanadium phosphate cathode material of lithium ion battery

A lithium-ion battery, lithium vanadium phosphate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of restricting the development of high-performance lithium-ion battery technology, large investment in industrial production equipment, and cumbersome gel-making process. Safe to use, simple and easy to operate, and excellent in high-rate performance

Inactive Publication Date: 2011-05-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the solid-phase method is simple to operate, the primary particle size of the product is large and the cycle stability is poor; in the sol-gel method, the gel molecules are small, the raw materials are fully mixed, and the product quality is high, but the gel preparation process is too cumbersome ; The hydrothermal method requires the pressure...

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  • Method for preparing flaky lithium vanadium phosphate cathode material of lithium ion battery
  • Method for preparing flaky lithium vanadium phosphate cathode material of lithium ion battery

Examples

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Embodiment 1

[0022] 1) LiOH·H 2 O and glycine were dissolved in deionized water to prepare LiOH·H with a concentration of 0.09 g / ml 2 O aqueous solution and 0.08 g / ml glycine aqueous solution;

[0023] 2) the NH 4 VO 3 Add to deionized water, stir magnetically, and prepare white turbid NH with a concentration of 0.1 g / ml 4 VO 3 solution, then press Li 3 V 2 (PO 4 ) 3 The stoichiometric ratio of H 3 PO 4 Added to the above NH 4 VO 3 solution, a brownish-red solution was obtained;

[0024] 3) Press Li 3 V 2 (PO 4 ) 3 The stoichiometric ratio of step 1) LiOH·H 2 O aqueous solution was added to the brown-red solution prepared in step 2), stirred and mixed, and then the glycine aqueous solution in step 1) was added, and the amount of glycine was LiOH·H 2 O. NH 4 VO 3 and H 3 PO 4 2% of the total weight, after stirring and mixing, add NH 4 VO 3 10% Super P by weight, and then stirred for 1 h; added ammonia water to adjust the pH value of the solution to 2, and then dried...

Embodiment 2

[0030] 1) LiOH·H 2 O and glycine were dissolved in deionized water to prepare LiOH·H with a concentration of 0.10 g / ml 2 O aqueous solution and 0.09 g / ml glycine aqueous solution;

[0031] 2) the NH4 VO 3 Add to deionized water, stir magnetically, and prepare white turbid NH with a concentration of 0.1 g / ml 4 VO 3 solution, then press Li 3 V 2 (PO 4 ) 3 The stoichiometric ratio of H 3 PO 4 Added to the above NH 4 VO 3 solution, a brownish-red solution was obtained;

[0032] 3) Press Li 3 V 2 (PO 4 ) 3 The stoichiometric ratio of step 1) LiOH·H 2 O aqueous solution was added to the brown-red solution prepared in step 2), stirred and mixed, and then the glycine aqueous solution in step 1) was added, and the amount of glycine was LiOH·H 2 O. NH 4 VO 3 and H 3 PO 4 5% of the total weight, after stirring and mixing, add NH 4 VO 3 10% Super P by weight, and then stirred for 1 h; added ammonia water to adjust the pH value of the solution to 3, and then dried t...

Embodiment 3

[0038] 1) LiOH·H 2 O and glycine were dissolved in deionized water to prepare LiOH·H with a concentration of 0.12 g / ml 2 O aqueous solution and 0.11 g / ml glycine aqueous solution;

[0039] 2) the NH 4 VO 3 Add to deionized water, stir magnetically, and prepare white turbid NH with a concentration of 0.1 g / ml 4 VO 3 solution, then press Li 3 V 2 (PO 4 ) 3 The stoichiometric ratio of H 3 PO 4 Added to the above NH 4 VO 3 solution, a brownish-red solution was obtained;

[0040] 3) Press Li 3 V 2 (PO 4 ) 3 The stoichiometric ratio of step 1) LiOH·H 2 O aqueous solution was added to the brown-red solution prepared in step 2), stirred and mixed, and then the glycine aqueous solution in step 1) was added, and the amount of glycine was LiOH·H 2 O. NH 4 VO 3 and H 3 PO 4 10% of the total weight, after stirring and mixing, add NH 4 VO 3 10% Super P by weight, and then stirred for 1 h; added ammonia water to adjust the pH value of the solution to 5, and then drie...

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Abstract

The invention relates to a method for preparing a flaky lithium vanadium phosphate cathode material of a lithium ion battery, comprising the following steps: 1) respectively preparing a LiOH.H2O aqueous solution and a glycine aqueous solution; 2) adding NH4VO3 to deionized water, and then adding H3PO4 to obtain a brownish red solution; 3) adding the LiOH.H2O solution to the brownish red solution, adding the glycine aqueous solution after the mixture is evenly stirred, adding a specified volume of SuperP, stirring for 1 hour, regulating the pH value of the mixed solution to 2-5 with ammonia water, and drying to obtain presoma powders; and 4) under the argon protection, sintering the presoma powders to obtain the flaky lithium vanadium phosphate cathode material. The preparation method is simple in processes; the prepared lithium vanadium phosphate cathode material is used for the lithium ion battery, and has good cyclical stability, high charge and discharge capacity, excellent high-multiplying power performance, and high material electroconductibility; and the prepared lithium vanadium phosphate cathode material is suitable for power supplies of portable power tools, battery-operated motor cycles, electric automobiles and the like.

Description

technical field [0001] The invention relates to a preparation method of a layered sheet-shaped lithium vanadium phosphate cathode material for a lithium ion battery, and belongs to the field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life and low self-discharge rate, and are widely used in electric vehicles, satellites, aerospace and military fields. Cathode materials are an important part of lithium-ion batteries, research and development of high-performance cathode materials has become the key to the development of lithium-ion batteries. [0003] At present, lithium-ion battery cathode materials mainly include lithium cobalt oxide, lithium manganese oxide and lithium iron phosphate, etc. Lithium cobalt oxide was the earliest used as lithium-ion battery cathode material, and the technology is mature, but cobalt resources are scarce and cost High, high toxicity, poor security. Lithium...

Claims

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Application Information

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IPC IPC(8): H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 乔彦强涂江平程丽娟相佳媛王秀丽
Owner ZHEJIANG UNIV
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