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Method for preparing Li3V2(PO4)3/C composite anode material and anode material made by the same

A composite positive electrode material, NH4H2PO4 technology, applied in the direction of electrode manufacturing, battery electrodes, electrical components, etc., can solve the problems of small purity particle size, cumbersome steps, danger, etc., achieve good electrical conductivity, simple reaction conditions, and improve electrical conductivity Effect

Inactive Publication Date: 2008-11-12
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the traditional high-temperature solid-phase method and high-temperature carbothermal reduction method, it is difficult to obtain samples with high purity, small particle size and good electrical properties
Moreover, the high-temperature solid-phase method is prone to danger due to the use of traditional hydrogen as a reducing agent, while the traditional sol-gel method is not suitable for large-scale industrial production at all.
And in Li 3 V 2 (PO 4 ) 3 After synthesis, steps such as surface coating with carbon are required to enhance its electrical conductivity. The steps are cumbersome and the effect is not obvious, which increases the production time of the product.

Method used

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  • Method for preparing Li3V2(PO4)3/C composite anode material and anode material made by the same
  • Method for preparing Li3V2(PO4)3/C composite anode material and anode material made by the same
  • Method for preparing Li3V2(PO4)3/C composite anode material and anode material made by the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh LiOH·H with the molar ratio of Li:V:P:citric acid=3:2:3:2 2 O, V 2 o 5 , NH4 h 2 PO 4 and citric acid, put it in a 500ml ball mill jar, use acetone as a dispersant, the ball mill speed is 400 rpm, and the ball mill time is 8h. After the completion, the mixture is sent into the muffle furnace for pretreatment at 300°C for 2 hours. Decompose the residual organic matter, cool naturally with the furnace, take out the sample and put it back into the ball mill jar for ball milling, the ball milling speed is 200 rpm, and the ball milling time is 5h. Then the sample was sent to a closed-type Ar protection atmosphere muffle furnace and roasted at 500 ° C for 6 hours, and cooled to room temperature with the furnace temperature to obtain Li 3 V 2 (PO 4 ) 3 / C composite cathode material.

Embodiment 2

[0039] Weigh LiOH·H with the molar ratio of Li:V:P:citric acid=3:2:3:2 2 O, V 2 o 5 , NH 4 h 2 PO 4 and citric acid, put it in a 500ml ball mill jar, use ethanol as a dispersant, the ball mill speed is 600 rpm, and the ball mill time is 6h. After the completion, the mixture is sent into the muffle furnace for pretreatment at 300°C for 4 hours. Decompose the remaining organic matter, cool naturally with the furnace, take out the sample and put it back into the ball mill jar for low-speed ball milling, the ball milling speed is 300 rpm, and the ball milling time is 4h. Then the sample was sent to a closed-type Ar protection atmosphere muffle furnace for 10 hours at 700 ° C, and cooled to room temperature with the furnace temperature to obtain Li 3 V 2 (PO 4 ) 3 / C composite cathode material.

Embodiment 3

[0041] Weigh LiOH·H with the molar ratio of Li:V:P:citric acid=3:2:3:2 2 O, V 2 o 5 , NH 4 h 2 PO 4 and citric acid, put it in a 500ml ball mill jar, use acetone as a dispersant, the ball mill speed is 500 rpm, and the ball mill time is 7h. After the completion, the mixture is sent into the muffle furnace for pretreatment at 450°C for 2 hours. Decompose the remaining organic matter, cool naturally with the furnace, take out the sample and put it back into the ball mill jar for low-speed ball milling, the ball milling speed is 400 rpm, and the ball milling time is 2h. Then the sample was sent to a closed-type Ar protection atmosphere muffle furnace and roasted at 670 ° C for 8 hours, and cooled to room temperature with the furnace temperature to obtain Li 3 V 2 (PO 4 ) 3 / C composite cathode material.

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Abstract

The invention discloses a preparation method of a Li3V2 (PO4)3 / C composite anode material and a prepared anode material. The preparation method is as follows: a. Li source, V source, organic carbon source and NH4H2PO4 are ball-milled together and evenly mixed; b. the product obtained in step a is pretreated at a temperature of 300 DEG C to 450 DEG C; c. the pretreated product is roasted at a temperature of 500 DEG C to 700 DEG C in the protective atmosphere of inert gas. By adopting low-temperature solid-phase method to synthesize the anode material of the lithium ion battery, the preparation method has simple reaction conditions and convenient steps, and is extremely suitable for mass production; organic matter is used as the indirect carbon source which is fully ball-milled and mixed to form carbon after pretreatment, thus the agglomeration of material grains can be effectively organized and the conductivity of the materials can be improved.

Description

technical field [0001] The present invention relates to a kind of positive electrode material preparation method for lithium ion battery and the positive electrode material prepared, particularly relate to a kind of Li ion battery for lithium ion battery 3 V 2 (PO 4 ) 3 The preparation method of / C composite cathode material and the prepared Li 3 V 2 (PO 4 ) 3 / C composite cathode material. Background technique [0002] Lithium-ion battery is a high-capacity, high-power battery, which is mainly used in small devices, especially mobile phones, laptop computers, and portable power tools. Lithium-ion batteries are generally composed of battery cover components, battery casings, electrolytes, and battery cells wound by positive and negative electrodes and separator paper. Wherein the positive electrode active material is evenly coated on the positive electrode sheet, and the negative electrode active material is correspondingly evenly coated on the negative electrode she...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/38H01M4/58
CPCY02E60/10
Inventor 唐联兴王驰伟万华平唐红辉王晋玉周冬
Owner SHENZHEN BAK BATTERY CO LTD
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