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Preparation method of lithium titanate composite cathode material of lithium battery

A negative electrode material, lithium titanate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low energy density per unit mass of lithium titanate materials, and achieve the effect of high cost performance, good effect and uniform mixing

Active Publication Date: 2017-05-24
四川国创成电池材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention aims to solve the problem of low energy density per unit mass of lithium titanate material, and increase the unit specific capacity of composite negative electrode material by adding iron oxide material, so as to achieve the purpose of increasing the energy density per unit mass of negative electrode material

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] A preparation method of a lithium titanate composite negative electrode material for a lithium battery, comprising the following steps:

[0023] A. Weigh lithium carbonate and rutile titanium dioxide according to the ratio of lithium ion to titanium ion molar ratio of 1:1, put them into a ball mill jar, add deionized water as a grinding aid, and dry after mixing evenly to obtain lithium / Titanium mixed powder;

[0024] B. Pulverize the dried lithium / titanium mixed powder and put it into a high-temperature sintering furnace, raise the temperature to 400°C at a heating rate of 1°C / min, and keep it for 4 hours to obtain a lithium titanate precursor material;

[0025] C, weigh ferric chloride and lithium titanate precursor in the ratio of 1:4 by iron ion and lithium titanate molar ratio, put ferric chloride and lithium titanate precursor into the stirring tank, press solid-liquid ratio as Add deionized water at a ratio of 1:10, and stir until the iron salt dissolves;

[0...

Embodiment 2

[0029] A preparation method of a lithium titanate composite negative electrode material for a lithium battery, comprising the following steps:

[0030] A. Weigh lithium hydroxide and perovskite-type titanium dioxide according to the molar ratio of lithium ions to titanium ions of 1:1.1, put them into a ball mill jar, add deionized water as a grinding aid, and dry them after mixing evenly. Obtain lithium / titanium mixed powder;

[0031] B. Pulverize the dried lithium / titanium mixed powder and put it into a high-temperature sintering furnace, raise the temperature to 450°C at a heating rate of 4°C / min, and keep it for 8 hours to obtain a lithium titanate precursor material;

[0032] C. Weigh the ferric sulfate, ferric nitrate and lithium titanate precursors according to the molar ratio of iron ions and lithium titanate as 1:15, put the ferric sulfate, ferric nitrate and lithium titanate precursors into the stirring tank, press Add deionized water at a solid-to-liquid ratio of 1:...

Embodiment 3

[0036] A preparation method of a lithium titanate composite negative electrode material for a lithium battery, comprising the following steps:

[0037] A. Weigh lithium oxalate and perovskite-type titanium dioxide according to the molar ratio of lithium ions and titanium ions of 1:1.08, put them into a ball mill jar, add deionized water as a grinding aid, and dry them after mixing evenly to obtain Lithium / titanium mixed powder;

[0038] B. Pulverize the dried lithium / titanium mixed powder and put it into a high-temperature sintering furnace, raise the temperature to 550°C at a heating rate of 5°C / min, and keep it for 12 hours to obtain a lithium titanate precursor material;

[0039] C. Take iron acetate and lithium titanate precursors in a ratio of 1:10 by iron ion and lithium titanate molar ratio, put iron acetate and lithium titanate precursors into a stirring tank, and press the solid-to-liquid ratio to be 1: Add deionized water at a ratio of 50, and stir until the iron sa...

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Abstract

The invention relates to a preparation method of a lithium titanate composite cathode material of a lithium battery, and belongs to the technical field of cathode materials of lithium ion batteries. The method comprises the steps that a lithium titanate precursor is prepared; soluble ferric salt is added to oxalic acid mixed with the lithium titanate precursor; a suspension of ferric oxalate and the lithium titanate precursor is prepared by a precipitation method; and finally high-temperature treatment is performed on mixed powder to obtain the lithium titanate and ferric oxide composite cathode material. The lithium titanate composite cathode material prepared by the method has the rapid charging performance of a lithium titanate material and the high specific capacity performance of ferric oxide; the cost is low; a technology is simple; and industrial production is facilitated.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery material. Specifically, the invention relates to a preparation method of a lithium titanate composite negative electrode material for a lithium battery, which belongs to the technical field of lithium ion battery negative electrode materials. Background technique [0002] In recent years, my country's electric vehicle industry has entered a period of rapid development, especially lithium-ion battery-powered vehicles. Lithium-ion power batteries are composed of four main components, namely positive electrode, negative electrode, separator and electrolyte. Lithium titanate, as an alloy-type negative electrode material, has a face-centered cubic spinel structure. The intercalation and deintercalation of lithium ions during charging and discharging have little effect on the structure of lithium titanate materials, so the crystal structure of lithium titanate has almost no This phenome...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/62H01M10/0525B60N2/0244B60N2/2878B60N2/01B60N2/2893Y02E60/10B60N2/0272B60N2/02246B60N2/02253
Inventor 胡蕴成王睿
Owner 四川国创成电池材料有限公司
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