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Composite material Li3V2(PO4)3/Li4Ti5O12 and preparation method thereof

A technology of composite materials and mixtures, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as unsatisfactory rate and cycle performance, electrolyte dissolution, etc.

Inactive Publication Date: 2012-01-11
MCNAIR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When charged to 4.8V (vs.Li / Li + ) Li 3 V 2 (PO 4 ) 3 All three lithium ions in the battery can be extracted, but it is easy to cause the decomposition of the electrolyte and the dissolution of vanadium at high potentials, resulting in unsatisfactory rate and cycle performance at high potentials.

Method used

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  • Composite material Li3V2(PO4)3/Li4Ti5O12 and preparation method thereof
  • Composite material Li3V2(PO4)3/Li4Ti5O12 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of Li 3 V 2 (PO 4 ) 3 / Li 4 Ti 5 o 12 Composite materials, including spinel-type Li in parts by mass 4 Ti 5 o 12 99 parts, monoclinic Li 3 V 2 (PO 4 ) 3 for 1 serving.

[0037] Li 3 V 2 (PO 4 ) 3 / Li 4 Ti 5 o 12 The preparation method of composite material comprises the following specific steps:

[0038] Step A, preparation of monoclinic Li 3 V 2 (PO 4 ) 3

[0039] a. Lithium hydroxide (LiOH·H 2 O), vanadium pentoxide (V 2 o 5 ) and phosphoric acid (H 3 PO 4 ) was dissolved in 400ml deionized water under magnetic stirring to form solution I, wherein calculated according to the amount of substance, n Li : n V : n PO4- =3.0:2:3;

[0040] b. Dissolve 1.5 g of citric acid in 70 ml of deionized water under ultrasonic dispersion conditions to obtain solution II;

[0041] c. In a water bath at 70°C, under the condition of vigorous stirring, slowly add solution II to solution I dropwise to obtain solution III;

[0042] d. React the solu...

Embodiment 2

[0056] A kind of Li 3 V 2 (PO 4 ) 3 / Li 4 Ti 5 o 12 Composite materials, including spinel-type Li in parts by mass 4 Ti 5 o 12 99 parts, monoclinic Li 3 V 2 (PO 4 ) 3 for 1 serving.

[0057] Li 3 V 2 (PO 4 ) 3 / Li 4 Ti 5 o 12 The preparation method of composite material comprises the following specific steps:

[0058] Step A, preparation of monoclinic Li 3 V 2 (PO 4 ) 3

[0059] a. Lithium acetate (CH 3 COOLi·2H 2 O), ammonium metavanadate (NH 4 VO 3 ) and phosphoric acid (H 3 PO 4 ) was dissolved in 350ml deionized water under magnetic stirring to form solution I, wherein calculated according to the amount of substance, n Li : n V : n PO4- =3.05:2:3;

[0060] b. Dissolve 2.7g of glycine in 100ml of deionized water under the condition of ultrasonic dispersion to obtain solution II;

[0061] c. In a water bath at 70°C, under the condition of vigorous stirring, slowly add solution II to solution I dropwise to obtain solution III;

[0062] d. R...

Embodiment 3

[0076] A kind of Li 3 V 2 (PO 4 ) 3 / Li 4 Ti 5 o 12 Composite materials, including spinel-type Li in parts by mass 4 Ti 5 o 12 99.5 parts, monoclinic Li 3 V 2 (PO 4 ) 3 0.5 parts.

[0077] Li 3 V 2 (PO 4 ) 3 / Li 4 Ti 5 o 12 The preparation method of composite material comprises the following specific steps:

[0078] Step A, preparation of monoclinic Li 3 V 2 (PO 4 ) 3

[0079] a. Lithium hydroxide (LiOH·H 2 O), ammonium metavanadate (NH 4 VO 3 ) and ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) was dissolved in 400ml deionized water under magnetic stirring to form solution I, wherein calculated according to the amount of substance, n Li : n V : n PO4- =3.1:2:3;

[0080] b. Dissolve 4.2g of oxalic acid in 80ml of deionized water under the condition of ultrasonic dispersion to obtain solution II;

[0081] c. In a water bath at 70°C, under the condition of vigorous stirring, slowly add solution II to solution I dropwise to obtain solution III; ...

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Abstract

The invention relates to the technical field of materials of electrodes of a lithium ion battery, and especially relates to a composite material Li3V2(PO4)3 / Li4Ti5O12 and a preparation method thereof. According to the invention, Li4Ti5O12 is coated on monoclinic Li3V2(PO4)3 with mechanical ball milling combined with heat treatment, wherein spinel type Li4Ti5O12 has a stabile structure, a coating Li4Ti5O12 not only can provide a mechanical support for monoclinic Li3V2(PO4)3, but also can be used as a protective layer to reduce the contact area of an active substance and an electrolyte, thereby reducing the generation of side reactions and improving electrochemial performances of Li3V2(PO4)3 at a high potential. In comparison with monoclinic Li3V2(PO4)3 which is not coated with Li4Ti5O12, the material prepared in the present invention exhibits excellent multiplying power and cycle performances, and a coating process in the invention is simple.

Description

technical field [0001] The present invention relates to the preparation method of lithium ion battery electrode material, particularly relate to a kind of Li 4 Ti 5 o 12 Coated Li 3 V 2 (PO 4 ) 3 Composite materials and methods for their preparation. Background technique [0002] Lithium-ion batteries have been widely used in various electronic devices due to their advantages of no memory effect, high working voltage, long cycle life, and high energy density. In addition, with the continuous reduction of fossil fuels and the increasing environmental pollution caused by burning fossil fuels, governments and automakers around the world are now working on the development of hybrid electric vehicles and electric vehicles, and lithium-ion batteries are a potential Power supply for electric vehicles. [0003] Monoclinic Li 3 V 2 (PO 4 ) 3 Stable structure, high ionic conductivity, high working voltage, and high energy density, it is a positive electrode material that i...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 王丽娟唐致远张新河马莉刘东高利亭
Owner MCNAIR TECH
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