Preparation method of carbon-coated lithium titanate

A carbon-coated lithium titanate and titanium source technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of reduced material gram capacity, low electronic conductivity, low energy density, etc., to improve high-rate performance and High temperature performance, simple and practical preparation process, wide range of raw material sources

Active Publication Date: 2011-01-12
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most commercial lithium-ion batteries use carbon-based materials as negative electrodes. However, carbon-based negative electrode materials have many defects: for example, the formation of solid electrolyte interfacial film (SEI) during the first charge and discharge, resulting in irreversible capacity loss and insufficient rate performance. There are high temperature failure risks and safety risks, etc. These problems make carbon-based materials unable to meet the needs of high-capacity, high-rate power/energy storage batteries
[0005] Lithium titanate has good electrochemical energy and safety p

Method used

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  • Preparation method of carbon-coated lithium titanate
  • Preparation method of carbon-coated lithium titanate
  • Preparation method of carbon-coated lithium titanate

Examples

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Embodiment 1

[0031] Embodiment 1: Weigh 1mol of TiO 2 and 0.8 mol of LiCl, dispersed in 200 mL of distilled water; add 12 g of capric acid, heat to 60 ° C and disperse with vigorous stirring for 5 hours to obtain a uniform milky white thick suspension; transfer the suspension to a sealable reaction and heated to 220°C in a container, and allowed to react at a constant temperature of 220°C for 12 hours; after the reaction was completed, the reaction product was cooled to room temperature, washed repeatedly with a mixture of alcohol and water, centrifuged, and dried to collect the precursor; And, the collected precursor was transferred to an atmosphere furnace filled with nitrogen, baked at 800° C. for 10 hours, and collected after cooling to obtain carbon-coated lithium titanate.

[0032] figure 1 It is the thermogravimetric curve (TG) figure of precursor in the embodiment 1 of the present invention, from figure 1 It can be seen that the coating amount of carbon in Example 1 is about 25%....

Embodiment 2

[0033] Embodiment 2: Weigh 1mol of TiO 2 and 0.9 mol of LiNO 3 , dispersed in 200mL of deionized water; add 1.2g capric acid, heat to 100°C and disperse vigorously for 1 hour to obtain a uniform milky white thick suspension; transfer the suspension into a closeable reactor and Heating to 80°C, allowing it to react at a constant temperature of 80°C for 48 hours; after the reaction is completed, the reaction product is cooled to room temperature, washed repeatedly with a mixed solution of alcohol and water, centrifuged, and dried to collect the precursor; and, the The collected precursors were transferred to an atmosphere furnace filled with argon, baked at 600°C for 24 hours, and collected after cooling to obtain carbon-coated lithium titanate.

Embodiment 3

[0034] Embodiment 3: Weigh 1mol of TiO 2and 1.0mol of LiF, dispersed in 200mL of water; add 6g of nonanoic acid, heat to 80°C and disperse vigorously for 2 hours to obtain a uniform milky white thick suspension; transfer the suspension to a closed reactor and heating to 350°C, allowing it to react at a constant temperature of 350°C for 3 hours; after the reaction is completed, the reaction product is cooled to room temperature, washed repeatedly with a mixed solution of alcohol and water, centrifuged, and dried to collect the precursor; and , the collected precursor was transferred to an atmosphere furnace filled with argon and nitrogen gas mixture, baked at 950°C for 5 hours, and collected after cooling to obtain carbon-coated lithium titanate.

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Abstract

The invention discloses a preparation method of carbon-coated lithium titanate, comprising the following steps of: 1) weighing and dispersing lithium source and titanium source in distilled water or deionized water; 2) adding long-chain aliphatic carboxylic acid to the water, heating the water to 30 to 100 DEG C, followed by uniform stirring and dispersion in order to obtain suspension; 3) transferring the suspension into a closed reaction container for being heated so that the suspension is subjected to reaction at constant temperature; 4) cooling reaction products to room temperature upon the end of the reaction, repeatedly washing with mixed liquid of alcohol and water, centrifuging and drying the reaction products, and collecting precursor; and (5) putting the collected precursor in an atmosphere furnace filled with non-oxidative gas to be roasted, and then cooling the roasted precursor to result in the carbon-coated lithium titanate. Compared with the prior art, the preparation method according to the invention achieves the formation of uniform carbon-coated layers under the protection of non-oxidative gas by means of surface coordination of long-chain aliphatic carboxylic acid and lithium titanate, thus the conductivity of lithium titanate can be improved and the high-rate and high temperature performances of lithium ion secondary battery can also be enhanced.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a preparation method of carbon-coated lithium titanate. Background technique [0002] With the low-carbon economy in the ascendant, lithium-ion batteries are actively developing in the direction of power vehicles and grid energy storage, and the development of lithium-ion batteries that can be quickly charged and discharged has become the focus of industry research. [0003] At present, most commercial lithium-ion batteries use carbon-based materials as negative electrodes. However, carbon-based negative electrode materials have many defects: for example, the formation of solid electrolyte interfacial film (SEI) during the first charge and discharge, resulting in irreversible capacity loss and insufficient rate performance. There are high temperature failure risks and safety risks. These problems make carbon-based materials unable to meet the needs of high-capacity, high-rate...

Claims

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Application Information

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IPC IPC(8): H01M4/131
CPCY02E60/122Y02E60/10
Inventor 陈小波赵丰刚夏恒涛
Owner DONGGUAN AMPEREX TECH
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