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Preparation method for lithium ion battery Li3V2 (Po4)3/C composite material

A technology for lithium ion batteries and composite materials, which is applied in the field of preparation of Li3V23/C composite materials for lithium ion batteries, can solve the problems that the cycle performance needs to be improved, the rate characteristics and cycle performance of the lithium vanadium phosphate composite materials are not ideal, and the like, and can reduce the temperature , the effect of shortening the calcination time and excellent electrochemical performance

Inactive Publication Date: 2014-04-30
MCNAIR TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rate characteristics and cycle performance of carbon-coated lithium vanadium phosphate composites prepared by the sol-gel method are not ideal, especially the cycle performance at high rates needs to be improved.

Method used

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  • Preparation method for lithium ion battery Li3V2 (Po4)3/C composite material
  • Preparation method for lithium ion battery Li3V2 (Po4)3/C composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A lithium ion battery Li 3 V 2 (PO 4 ) 3 The preparation method of / C composite material is characterized in that, comprises following preparation steps:

[0025] a. Lithium hydroxide (LiOH·H 2 O), ammonium metavanadate (NH 4 VO 3 ), ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), oxalic acid (H 2 C 2 o 4 2H 2 O) and complexing agent I β-cyclodextrin are dissolved in 400ml deionized water under mechanical stirring to form solution I, wherein calculated according to the amount of substance, n Li : n V : n PO4- =3.0:2:3, n V : n 草酸 =1:3, m β-环糊精 :m 最终产品 =0.25;

[0026] b. In a water bath at 70°C, stir the solution I for 1 h;

[0027] c. Dissolve complexing agent II citric acid in 50 mL deionized water under mechanical stirring to obtain solution II;

[0028] d. Under vigorous stirring, slowly drop solution II into solution I to obtain solution III;

[0029] e. React solution III obtained in step d in a water bath at 70°C for 4 hours to obtain solutio...

Embodiment 2

[0034] A lithium ion battery Li 3 V 2 (PO 4 ) 3 The preparation method of / C composite material is characterized in that, comprises following preparation steps:

[0035] a. Lithium hydroxide (LiOH·H 2 O), ammonium metavanadate (NH 4 VO 3 ), ammonium dihydrogen phosphate (NH4 h 2 PO 4 ), oxalic acid (H 2 C 2 o 4 2H 2 O) and complexing agent I β-cyclodextrin are dissolved in 450ml deionized water under mechanical stirring to form solution I, wherein calculated according to the amount of substance, n Li : n V : n PO4- =3.05:2:3, n V : n 草酸 =1:3.5, m β-环糊精 :m 最终产品 =0.3;

[0036] b. In a water bath at 75°C, stir the solution I for 1 h;

[0037] c. Dissolve complexing agent II glycine in 70 mL deionized water under mechanical stirring to obtain solution II;

[0038] d. Under vigorous stirring, slowly drop solution II into solution I to obtain solution III;

[0039] e. React solution III obtained in step d in a water bath at 75°C for 3 hours to obtain solution IV...

Embodiment 3

[0044] A lithium ion battery Li 3 V 2 (PO 4 ) 3 The preparation method of / C composite material is characterized in that, comprises following preparation steps:

[0045] a. Lithium acetate (CH 3 COOLi·2H 2 O), vanadium pentoxide (V 2 o 5 ), ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), oxalic acid (H 2 C 2 o 4 2H 2 O) and complexing agent I β-cyclodextrin are dissolved in 300ml deionized water under mechanical stirring to form solution I, wherein calculated according to the amount of substance, n Li : n V : n PO4- =3.1:2:3, n V : n 草酸 =1:4, m β-环糊精 :m 最终产品 = 0.5;

[0046] b. In a water bath at 80°C, stir the solution I for 0.5h;

[0047] c. Dissolve complexing agent II ascorbic acid in 70 mL of deionized water under mechanical stirring to obtain solution II;

[0048] d. Under vigorous stirring, slowly drop solution II into solution I to obtain solution III;

[0049] e. React solution III obtained in step d in a water bath at 80° C. for 2 hours to obtai...

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Abstract

The invention relates to the technical field of battery material and particularly discloses a preparation method for a lithium ion battery Li3V2 (Po4) 3 / C composite material. According to the invention, Beta cyclodextrin serving as a complexing agent and a silicon source is introduced in a sphoric acid vanadium Lithium system at first time; and the material adopted by the invention is mixed at the molecule level, so that the carbon-coated monocline phosphate vanadium lithium material with the advantages of small particle size, uniform distribution, and excellent electrochemistry property, can be compounded at a lower sintering temperature and a shorter sintering time.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a lithium ion battery Li 3 V 2 (PO 4 ) 3 / C composite material preparation method. Background technique [0002] In the past few decades, lithium-ion batteries have been widely used in various portable electronic products by virtue of their own advantages. In addition, the advantages of high capacity, high power and environmental protection of lithium-ion batteries make them the power source most likely to be applied to hybrid electric vehicles or electric vehicles. Safety is a crucial factor in power supplies for electric vehicles. The layered lithium cobalt oxide (LiCoO 2 ) has poor thermal stability and is not suitable for lithium-ion batteries for electric vehicles. Polyanion materials have good thermal stability and are considered to be promising cathode materials for lithium-ion batteries. Lithium vanadium monoclinic phosphate (Li 3 V 2 (PO 4 ) 3 ) has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58
CPCY02E60/10
Inventor 王利娟李中延唐致远罗永莉张新河马莉刘东王浩
Owner MCNAIR TECH
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