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Preparing method of lithium titanate cathode material for lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as product particle aggregation and uneven product particle size distribution, achieve easy large-scale production, and be conducive to product shape control. , the effect of simplifying the experimental process

Inactive Publication Date: 2013-01-30
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid-phase reaction method has simple steps and is suitable for large-scale production, but the particle size of lithium titanate obtained by the solid-state reaction method is in the micron range, and the particle size distribution of the product is uneven
Although the sol-gel method can obtain lithium titanate particles with uniform shape and small particle size, it generally still requires high temperature treatment above 800°C, which leads to the aggregation of product particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Under the condition of magnetic stirring, slowly drop 5ml of acetic acid into 20ml of titanium isopropoxide, and fully mix and stir for 15min. The resulting mixed solution was slowly poured into 115 ml of deionized water and stirred for 1 hour. Nitric acid was added dropwise to make the pH value of the solution = 1, the temperature was raised to 78°C, and the reaction was stirred for 75 minutes. After natural cooling, 5.1 g of lithium nitrate was added to make the molar concentration ratio of lithium ions and titanium ions reach 5:4. After fully mixing, hydrothermal reaction was carried out at a reaction temperature of 150°C and a reaction time of 24 hours to obtain a precursor. After the reaction precursor was dried, it was calcined at 600° C. for 5 hours to obtain lithium titanate powder.

Embodiment 2

[0022] Under the condition of magnetic stirring, slowly drop 5ml of acetic acid into 20ml of titanium isopropoxide, and fully mix and stir for 15min. The resulting mixed solution was slowly poured into 115 ml of deionized water and stirred for 1 hour. Sulfuric acid was added dropwise to make the pH value of the solution = 2, the temperature was raised to 70°C, and the reaction was stirred for 90 minutes. After natural cooling, 5.1 g of lithium nitrate was added to make the molar concentration ratio of lithium ions and titanium ions reach 5:4. After fully mixing, hydrothermal reaction was carried out at a reaction temperature of 190°C and a reaction time of 10 hours to obtain a precursor. After the reaction precursor was dried, it was calcined at 800° C. for 2 hours to obtain lithium titanate powder.

Embodiment 3

[0024] Under the condition of magnetic stirring, slowly drop 5ml of acetic acid into 20ml of titanium isopropoxide, and fully mix and stir for 15min. The resulting mixed solution was slowly poured into 115 ml of deionized water and stirred for 1 hour. Nitric acid was added dropwise to make the pH value of the solution = 3, the temperature was raised to 80°C, and the reaction was stirred for 60 minutes. After natural cooling, 12g of lithium sulfate was added to make the molar concentration ratio of lithium ions and titanium ions reach 5:4. After fully mixing, hydrothermal reaction was carried out at a reaction temperature of 160°C and a reaction time of 18 hours to obtain a precursor. After the reaction precursor was dried, it was calcined at 700° C. for 3 hours to obtain lithium titanate powder.

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Abstract

The invention discloses a preparing method of a lithium titanate cathode material for a lithium ion battery. The preparing method includes that: a titanium dioxide precursor is prepared and subjected to a hydrothermal reaction; the titanium dioxide precursor is crystallized at high temperature; and the lithium titanate cathode material for the lithium ion battery is obtained. According to the lithium titanate cathode material for the lithium ion battery and prepared in the method, the phenomena of uneven product particle size distribution and product particle conglomeration are avoided. The preparing method simplifies the experimental process, leads practical size of titanium dioxide particles prepared in a hydrothermal method to be on the nanometer level, is favorable for controlling product shape, leads crystallization sintering to be even, and facilitates large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery material, in particular to a preparation method of a lithium titanate negative electrode material. It belongs to the field of lithium battery materials. Background technique [0002] Spinel-type lithium titanate is becoming the research focus of lithium-ion battery anode materials because of its series of unique characteristics such as: good cycle performance, outstanding safety performance, low cost, etc., and is even listed as the No. Anode materials for second-generation lithium-ion power batteries. Using lithium titanate as the negative electrode material of lithium-ion batteries can effectively improve the rapid charge and discharge performance, cycle performance and safety performance of the battery under the premise of sacrificing a certain specific energy. Therefore, lithium titanate has become a popular research object for high-power lithium-ion battery anode materials. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485
CPCY02E60/122Y02E60/10
Inventor 张辉
Owner IRICO
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