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Preparation method of anode material of lithium battery

A positive electrode material and lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor low temperature performance, reduced battery discharge capacity, and decreased battery charge and discharge performance, and achieve good conductivity and flexibility. Effect of increasing charge and discharge capacity and improving charge and discharge performance

Active Publication Date: 2017-08-25
LIUZHOU HAOXIANGTE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are non-negligible defects in the preparation method of the positive electrode material of lithium iron phosphate in the prior art: 1) the electrochemical performance of the active material of the lithium iron phosphate positive electrode material is poor, resulting in poor low temperature performance of the lithium battery positive electrode material, The production and use of lithium iron phosphate lithium batteries are limited; 2) the ion conductivity of lithium iron phosphate is poor, the conductive agent added is not mixed well with the active material, and the conductive agent is unevenly dispersed in the active material, which makes the charging and discharging of the battery Performance decline, battery discharge capacity shrinks; 3) The preparation method is cumbersome, the production efficiency is low, the operation is not easy, and the raw material and production cost are higher

Method used

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  • Preparation method of anode material of lithium battery

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Effect test

Embodiment 1

[0027] A preparation method for a lithium battery cathode material, comprising the following steps:

[0028] Step A, divide the positive electrode active material into three equal parts, divide the conductive agent into three equal parts, divide the binder into four parts by weight ratio 1:1:1:1.2, and divide the dispersant into four parts by weight ratio 1:1:1:2 is divided into four parts, pour the first part of the binder into the mixer with solvent, and add the first equal part of the conductive agent and the first equal part of the solvent to the mixer while stirring. Positive electrode active material, after the first equal portion of conductive agent and the first equal portion of positive active material are added, add the first portion of dispersant to the mixer, stir at high speed for 1 hour and then vacuumize, when the vacuum degree in the mixer reaches 0.01 MPa, continue pumping for 3 minutes, and stir at a medium speed for 1.5 hours under vacuum. After the stirring...

Embodiment 2

[0038] A preparation method for a lithium battery cathode material, comprising the following steps:

[0039] Step A, divide the positive electrode active material into three equal parts, divide the conductive agent into three equal parts, divide the binder into four parts by weight ratio 1:1:1:1.2, and divide the dispersant into four parts by weight ratio 1:1:1:2 is divided into four parts, pour the first part of the binder into the mixer with solvent, and add the first equal part of the conductive agent and the first equal part of the solvent to the mixer while stirring. Positive electrode active material, after the first equal portion of conductive agent and the first equal portion of positive active material are added, add the first portion of dispersant to the mixer, stir at high speed for 2 hours and then vacuumize, when the vacuum degree in the mixer reaches 0.01 MPa, continue pumping for 3 minutes, and stir at a medium speed for 2.5 hours under vacuum. After the stirrin...

Embodiment 3

[0049] A preparation method for a lithium battery cathode material, comprising the following steps:

[0050] Step A, divide the positive electrode active material into three equal parts, divide the conductive agent into three equal parts, divide the binder into four parts by weight ratio 1:1:1:1.2, and divide the dispersant into four parts by weight ratio 1:1:1:2 is divided into four parts, pour the first part of the binder into the mixer with solvent, and add the first equal part of the conductive agent and the first equal part of the solvent to the mixer while stirring. Positive electrode active material, after the first equal portion of conductive agent and the first equal portion of positive active material are added, add the first portion of dispersant to the mixer, stir at high speed for 1.5h and then vacuumize, when the vacuum in the mixer reaches When the pressure is 0.01MPa, continue pumping for 3 minutes, and stir at a medium speed for 2 hours in a vacuum state. Afte...

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Abstract

The invention discloses a preparation method of an anode material of a lithium battery. The method comprises the following steps: A, equally dividing an anode active material and a conductive agent into three equal parts, dividing a binding agent into four parts and dividing a dispersant into four parts, and mixing the first part of binding agent, the first part of dispersant, the first equal part of positive active substance and the first equal part of conductive agent to obtain a first mixed material; B, preparing a second mixed material and a third mixed material; C, mixing the first mixed material, the second mixed material and the third mixed material to obtain an inner core active material; D, covering a layer of inorganic nanometer film on the outer part of the inner core active material to obtain the anode material of the lithium battery. The anode material of the lithium battery, prepared by the invention, has good conductivity and is high in tapping density; moreover, the volume of the prepared battery is large, and scale production demand can be met.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium batteries. More specifically, the present invention relates to a method for preparing a positive electrode material for a lithium iron phosphate lithium battery. Background technique [0002] The development and construction of clean energy is one of the most important fields of development in the world, and batteries are an important medium for rational and effective use of these new energy sources. Lithium-ion batteries have been widely used and developed in the weak current industry, and the key technology for preparing lithium batteries is battery materials, especially the positive electrode materials of lithium batteries. Currently commonly used positive electrode materials include lithium cobaltate positive electrode material, lithium nickel cobaltate positive electrode material, lithium iron phosphate positive electrode material and lithium manganate positi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5825H01M4/625H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 易鉴荣唐臻林荔珊
Owner LIUZHOU HAOXIANGTE SCI & TECH
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