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Lithium vanadate negative electrode material of lithium ion battery and preparation method thereof

A battery lithium vanadate, lithium ion battery technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problem that the role of negative electrode materials has not been discovered, lithium vanadate has not been studied, and the development of lithium titanate has been limited. and other problems, to achieve the effect of improving electrochemical performance, improving electrical conductivity, and simple preparation

Active Publication Date: 2017-06-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high Li-ion intercalation potential (~1.5 V) and limited specific capacity (~150 mAh g -1 ) fundamentally limits the further development of lithium titanate
[0007]Lithium vanadate [Li3VO4] has been regarded as a good lithium ion conductor material Extensively studied, but due to low electrical conductivity, the role of this material as an anode material for lithium-ion batteries has not been discovered
The synthesis method of this material is also limited to the general high-temperature solid-phase method or sol-gel method in air atmosphere, and the synthesis of lithium vanadate in reducing atmosphere or inert atmosphere has never been studied.

Method used

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  • Lithium vanadate negative electrode material of lithium ion battery and preparation method thereof
  • Lithium vanadate negative electrode material of lithium ion battery and preparation method thereof
  • Lithium vanadate negative electrode material of lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Will Li 2 CO 3 and V 2 o 5 Weigh according to the stoichiometric ratio of Li:V =3:1 (Li 2 CO 3 : 3.231g, V 2 o 5 : 2.624g), using a planetary ball mill for 4 hours;

[0042] Then, under the air atmosphere, heat to 350°C for pretreatment for 5 hours, and then grind again after cooling in the furnace;

[0043] Then, in the air atmosphere, sintering at a temperature of 750° C. for 10 hours to obtain a lithium vanadate negative electrode material for a lithium ion battery.

[0044] The XRD pattern of the product is shown in figure 1 From the curve in (a), it can be seen from the figure that a pure-phase lithium vanadate negative electrode material is synthesized by using this solid-state sintering method. There is no impurity peak in the spectrum, and the product has high purity. . The lithium vanadate negative electrode material is in the voltage range of 0.1-3.0V, and the rate is 0.2C. The first and second charge and discharge curves are as follows: figure 2 s...

Embodiment 2

[0046] Combine LiOH and NH 4 VO 3 Weigh according to the stoichiometric ratio of Li:V=3:1 (LiOH:2.518g, V 2 o 5 : 2.340g), using a planetary ball mill for 4 hours;

[0047] Then at 30%H 2 + 70% Ar (volume fraction ratio) atmosphere, heated to 350°C for pretreatment for 5 hours, and then ground again after cooling in the furnace;

[0048] Then at 30%H 2 + 70% Ar (volume fraction ratio) atmosphere, sintering at a temperature of 700 ° C for 10 hours to obtain a lithium vanadate negative electrode material for a lithium ion battery.

[0049] The XRD pattern of the product is shown in figure 1 From the curve in (b), it can be seen from the figure that a pure-phase lithium vanadate negative electrode material is synthesized by using this solid-state sintering method. There is no impurity peak in the spectrum, and the product has high purity. The lithium vanadate negative electrode material is in the voltage range of 0.1-2.5V, and the rate is 0.2C. The first and second charg...

Embodiment 3

[0051] CH 3 COOLi and V 2 o 5 Weigh according to the stoichiometric ratio of Li:V =3:1 (CH 3 COOLi: 3.06g, V 2 o 5 : 1.819g), using a planetary ball mill for 4 hours;

[0052] Then, under the air atmosphere, heat to 350°C for pretreatment for 5 hours, and then grind again after cooling in the furnace;

[0053] Then in 70%Ar+30H 2 % (volume fraction ratio) atmosphere, sintering at 750 ° C for 10 h to obtain lithium vanadate negative electrode materials for lithium-ion batteries.

[0054] The XRD pattern of the product is shown in Figure 5 From the curve in (a), it can be seen from the figure that a pure-phase lithium vanadate negative electrode material is synthesized by using this solid-state sintering method. There is no impurity peak in the spectrum, and the product has high purity.

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Abstract

The invention relates to a lithium ion battery cathode material lithium vanadate and a preparation method thereof. The method comprises the steps of: fully and uniformly mixing lithium compound containing and a compound precursor containing vanadium, and heating for pretreatment in the air, reducing atmosphere or inert atmosphere and sintering to obtain lithium ion battery cathode material lithium vanadate. The method also includes the addition of carbon containing material in the preparation process, so as to realize the carbon coating of the product. The carbon material can be added in the mixing process of precursor, or before the sintering reaction, or after the sintering reaction, and sintered again. The method has the advantages of simple process and easy operation, and the carbon material and the reductive atmosphere do not change the structure of lithium vanadate and the valence of vanadium. The carbon coated lithium ion battery cathode material synthesized by the method has excellent performances and low intercalation potential as the cathode material for lithium ion battery, and is expected to become the next generation of cathode material for lithium ion batteries. The synthetic method is suitable for industrialized production of high performance lithium ion battery cathode material lithium vanadate.

Description

technical field [0001] The invention relates to a lithium vanadate negative electrode material for a lithium ion battery and a preparation method thereof, in particular to a solid phase sintering method and carbon coating to prepare high-performance lithium vanadate [Li 3 VO 4 ] The method of negative electrode material. Background technique [0002] The operating voltage of lithium-ion batteries is relatively high. The operating voltage of commercialized general single lithium-ion batteries using lithium cobaltate as the positive electrode material is 3.6V, which is three times the operating voltage of ordinary MH-Ni and Cd-Ni batteries; At the same time, it has the advantages of small size, light weight, high mass-to-volume specific energy, large output power, long cycle life, fast charge and discharge, low self-discharge rate, and no memory effect. It has been widely used in various portable devices, Digital products and hybrid vehicles. [0003] Since SONY launched co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/58C01G31/00
CPCC01G31/00H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 赵彦明梁志勇董有忠
Owner SOUTH CHINA UNIV OF TECH
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