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Preparing method of highly conductive lithium iron phosphate anode material of lithium ionic cell

A lithium ion battery, lithium iron phosphate technology, applied in battery electrodes, electrode manufacturing, chemical instruments and methods, etc., can solve the problems of large surface energy, difficult to uniformly disperse carbon nanotubes, easy to agglomerate, etc., to improve electrical conductivity. high-rate charge-discharge ability, and the effect of simple preparation process

Inactive Publication Date: 2008-12-31
HANGZHOU LECHENG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small diameter and large surface energy of carbon nanotubes, agglomeration is easy to occur. If carbon nanotubes are directly added to lithium iron phosphate, it is difficult to achieve uniform dispersion of carbon nanotubes in lithium iron phosphate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Put the carbon nanotubes into a ball mill, mill them for 1 hour at a speed of 500 rpm, then put them into a jet mill and process them with airflow to obtain pretreated carbon nanotubes, and collect them for later use;

[0027] 2) Stir and mix the carbon nanotubes pretreated in step 1), 1mol / L hydrochloric acid and 1mol / L dilute nitric acid in a container according to the ratio of 1g: 200ml: 200ml, stir at a speed of 500rpm, and then ultrasonically treat for 1h , filtered under reduced pressure, washed with deionized water until the pH value is neutral, and the product is vacuum-dried at 150° C. and ground to obtain purified carbon nanotubes for use;

[0028] 3) Mix the carbon nanotubes purified in step 2) and nitric acid with a mass concentration of 68% according to the ratio of mass:volume=1.0g:100ml. After the mixture is ultrasonicated for 1h, it is stirred and condensed at 60°C for reflux for 2h, cooled, and removed. Dilute with deionized water, filter under reduc...

Embodiment 2

[0033] 1) Put the carbon nanotubes into a ball mill, mill them for 1 hour at a speed of 300 rpm, then put them into a jet mill and process them with airflow to obtain pretreated carbon nanotubes, and collect them for later use;

[0034] 2) Stir and mix the carbon nanotubes pretreated in step 1), 5mol / L hydrochloric acid and 6mol / L dilute nitric acid in a container according to the ratio of 1g: 50ml: 50ml, stir at a speed of 300rpm, and then ultrasonically treat for 3h , filtered under reduced pressure, washed with deionized water until the pH value is neutral, and the product is vacuum-dried at 120° C. and ground to obtain purified carbon nanotubes for use;

[0035] 3) Mixing the carbon nanotubes purified in step 2) and nitric acid with a mass concentration of 68% according to the ratio of mass:volume=1.0g:200ml, after the mixture was ultrasonically charged for 1.5h, stirred and condensed at 80°C for reflux for 3h, cooled, Dilute with deionized water, vacuum filter with microp...

Embodiment 3

[0039] 1) Put the carbon nanotubes into a ball mill, mill them for 1 hour at a speed of 500 rpm, then put them into a jet mill and process them with airflow to obtain pretreated carbon nanotubes, and collect them for later use;

[0040] 2) Stir and mix the carbon nanotubes pretreated in step 1), 2.5mol / L hydrochloric acid and 2.5mol / L dilute nitric acid in a container according to the ratio of 1g: 100ml: 100ml, stir at a speed of 400rpm, and then sonicate Treat for 1 hour, filter under reduced pressure, wash with deionized water until the pH value is neutral, vacuum-dry the product at 135°C, and grind to obtain purified carbon nanotubes for use;

[0041] 3) Mix the carbon nanotubes purified in step 2) and nitric acid with a mass concentration of 68% according to the ratio of mass:volume=1.0g:400ml. After the mixture is ultrasonicated for 2 hours, it is stirred and condensed at 100°C for reflux for 4 hours, cooled, and removed. Dilute with deionized water, filter under reduced ...

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PUM

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Abstract

The invention discloses a preparation method of a lithium iron phosphate anode material with high conductivity of a lithium ion battery. A carbon nano-pipe is added into lithium iron phosphate which is mixed with a conductive agent and a polyvinylidene fluoride binder. The carbon nano-pipe goes through at least one of such treatments as ball milling, gas pretreatment, purification treatment, acidification treatment and esterification treatment, which can effectively improve the purity of the carbon nano-pipe and reduce surface energy and twisting degree of the carbon nano-pipe, and lead the carbon nano-pipe to be arranged in order and scattered in the lithium iron phosphate, and form a conductive network with very small volume resistivity to improve the conductivity of the lithium iron phosphate. The adoption of the carbon nano-pipe as the conductive agent causes that the lithium iron phosphate which is used as the anode material of the lithium ion second battery has relatively good charge and discharge capability with large rate.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of a high conductivity lithium iron phosphate positive electrode material of a lithium ion battery. Background technique [0002] Lithium-ion secondary battery is a new type of green high-energy rechargeable battery successfully launched by Sony Corporation of Japan (SONY) in 1990. It has high voltage, high energy density, long cycle life, small self-discharge, no memory effect, and wide operating temperature range. , No pollution and many other advantages, widely used in mobile phones, portable electric tools, notebook computers, weapons and equipment, etc. With the increasing development of lithium-ion batteries, lithium-ion power batteries with large capacity and high rate charge and discharge have become the focus of the development of countries all over the world. Lithium-ion power batteries will be mainly...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/04C01B25/45H01M4/62
CPCY02E60/10
Inventor 黄德欢刘俊峰
Owner HANGZHOU LECHENG ELECTRONICS CO LTD
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