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Lithium titanate/graphene composite cathode material for lithium ion battery

A graphene composite, lithium-ion battery technology, applied in battery electrodes, batteries, negative electrodes and other directions, can solve the problems of low conductivity, poor high-rate charge and discharge performance, low specific capacity of lithium titanate negative electrode materials, etc. The effect of specific capacity, improved rate performance, and easy industrial production

Inactive Publication Date: 2015-08-19
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a preparation method of lithium titanate / graphene composite negative electrode material for lithium ion batteries. The problem to be solved is the low specific capacity, low electrical conductivity and poor high-rate charge and discharge performance of lithium titanate negative electrode material, etc. Shortcomings, while providing a simple process, low energy consumption, short production cycle, environmentally friendly preparation method of lithium titanate / graphene composite negative electrode material

Method used

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  • Lithium titanate/graphene composite cathode material for lithium ion battery
  • Lithium titanate/graphene composite cathode material for lithium ion battery
  • Lithium titanate/graphene composite cathode material for lithium ion battery

Examples

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Embodiment 1

[0058] Lithium titanate / graphene composite negative electrode material for lithium ion battery is prepared according to the following steps in this example:

[0059] a. Weigh 0.04mol of lithium hydroxide (LiOH·H 2 O) 1.680g, dissolved in 20ml of deionized water to prepare a 2mol / L lithium hydroxide solution; use a graduated cylinder to measure 17ml of 0.05mol butyl titanate solution, mix it with an equal volume of absolute ethanol, and stir under magnetic force Add the prepared lithium hydroxide solution drop by drop to obtain a white suspension, continue to stir for 1 hour, then transfer it to the reaction kettle for 24 hours at 180°C, cool to room temperature, and place it in a muffler after centrifugation, washing, and drying. Calcined in a furnace at 500°C for 10 hours, the obtained white powder is lithium titanate, which is ground for later use.

[0060] b, the above prepared lithium titanate Li 4 Ti 5 o 12 Weigh 2g, dissolve it in 20ml of absolute ethanol and stir it...

Embodiment 2

[0064] Lithium titanate / graphene composite negative electrode material for lithium ion battery is prepared according to the following steps in this example:

[0065] a. Weigh 0.043mol of lithium hydroxide (LiOH·H 2 O) 1.815g, wherein in order to make up for the loss of lithium at high temperature, make lithium hydroxide excess 8%, dissolve in 10ml deionized water, and prepare 4mol / L lithium hydroxide solution; measure 0.05mol titanic acid with a graduated cylinder Mix 17ml of butyl ester solution with an equal volume of absolute ethanol; add the prepared lithium hydroxide solution dropwise under magnetic stirring to obtain a white suspension, continue to stir for 1 hour, and then transfer to the reaction kettle for reaction at 180°C 24 hours; cool to room temperature, centrifuge, wash, and dry, then place in a muffle furnace for calcination at 700°C for 10 hours, and the white powder obtained is lithium titanate, which is ground for later use.

[0066] b, the above prepared l...

Embodiment 3

[0070] Lithium titanate / graphene composite negative electrode material for lithium ion battery is prepared according to the following steps in this example:

[0071] a. Weigh 0.043mol of lithium hydroxide (LiOH·H 2 O) 1.815g, wherein in order to make up for the loss of lithium at high temperature, make lithium hydroxide excess 8%, dissolve in 20ml deionized water, and prepare 2mol / L lithium hydroxide solution; measure 0.05mol titanic acid with a graduated cylinder Mix 17ml of butyl ester solution with an equal volume of absolute ethanol, add the prepared lithium hydroxide solution drop by drop under magnetic stirring, and continue stirring for 1 hour after obtaining a white suspension, then transfer it to a reaction kettle for reaction at 180°C 24 hours; cool to room temperature, centrifuge, wash, and dry, then place in a muffle furnace for calcination at 700°C for 10 hours, and the white powder obtained is lithium titanate, which is ground for later use.

[0072] b, the ab...

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Abstract

The invention discloses a lithium titanate / graphene composite cathode material for a lithium ion battery. The composite cathode material is obtained by mixing lithium titanate and graphene oxide and then performing reduction by a reducing agent. A preparation method of the composite cathode material comprises the steps of preparing pure-phase lithium titanate by a hydrothermal method, sufficiently mixing pure-phase lithium titanate and graphene oxide, adding an appropriate amount of reducing agent, and shifting pure-phase lithium titanate, graphene oxide and the reducing agent to a reaction kettle to react for a certain time at a certain temperature to obtain the lithium titanate / graphene composite cathode material. The method synthesizes the lithium titanate / graphene composite material by an industrially extensively used hydrothermal reaction, so that the method is simple to operate and low in equipment requirement, and is suitable for industrial production; and the prepared lithium titanate / graphene composite material has higher specific capacity, good high rate performance and excellent cycle performance, and is applicable to the fields of portable electronic equipment, electromobiles, energy storage equipment and the like.

Description

technical field [0001] The invention belongs to the field of electrochemistry and new energy materials, in particular to a lithium titanate / graphene composite negative electrode material for a lithium ion battery. Background technique [0002] The rapid development of modern society has led to a sharp increase in human demand for energy. The development and utilization of clean and new energy is the only way for the development of human society. Lithium-ion batteries, as "green secondary batteries in the 21st century", have the advantages of high voltage, high specific energy, long charge and discharge life, no memory effect, less environmental pollution, fast charging, and low self-discharge rate. As an important chemical power source, lithium-ion batteries are gradually moving from batteries used in mobile phones, notebook computers, digital cameras, portable small appliances, submarines, and aerospace to the field of electric vehicle power. As global energy and enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/362H01M4/485H01M4/583H01M10/0525H01M2004/027H01M2220/20H01M2220/30Y02E60/10
Inventor 朱继平段锐张阳阳祝杰王娟徐晨曦
Owner HEFEI UNIV OF TECH
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