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Preparation method for high-conductivity lithium titanate cathode material of lithium battery

A high-conductivity, negative-electrode material technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low compaction density and high energy consumption, and achieve the effect of increasing compaction density, improving roasting efficiency and reducing energy consumption

Active Publication Date: 2013-04-03
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The present invention aims to solve the problems of high energy consumption and low compaction density of the preparation method in the prior art, and provides a preparation method of a high-conductivity lithium titanate negative electrode material for a lithium battery. The present invention uses a solid-phase sintering method as the Based on the principles of cost reduction and ease of commercial application, lithium titanate materials with high conductivity can be prepared

Method used

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  • Preparation method for high-conductivity lithium titanate cathode material of lithium battery

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Embodiment 1

[0034] A method for preparing a high-conductivity lithium titanate negative electrode material for a lithium battery, comprising the following process steps:

[0035] A. Weigh the lithium-containing compound and the titanium-containing oxide respectively in the ball mill tank according to the ratio of Li:Ti=0.8:1 molar ratio between lithium ion and titanium ion, add deionized water as the dispersant, and carry out ball milling to obtain uniform mixing mixed slurry;

[0036] B. Transport the mixed slurry obtained in step A to a spray dryer for granulation and drying to obtain a dry precursor powder;

[0037] C. Put the precursor powder obtained in step B into a high-temperature furnace for roasting. First, raise the temperature from room temperature to 450°C at a rate of 1°C / min and keep it for 4 hours; then follow a rate of 1°C / min. Heating rate, the temperature was raised to 750°C and kept for 4 hours; finally cooled naturally to obtain the spinel lithium titanate material Li ...

Embodiment 2

[0042] A method for preparing a high-conductivity lithium titanate negative electrode material for a lithium battery, comprising the following process steps:

[0043] A. Weigh the lithium-containing compound and the titanium-containing oxide respectively in the ball mill tank according to the ratio of Li:Ti=0.85:1 molar ratio between lithium ion and titanium ion, add deionized water as the dispersant, and carry out ball milling to obtain uniform mixing mixed slurry;

[0044] B. Transport the mixed slurry obtained in step A to a spray dryer for granulation and drying to obtain a dry precursor powder;

[0045] C. Put the precursor powder obtained in step B into a high-temperature furnace for roasting. First, raise the temperature from room temperature to 650°C at a heating rate of 10°C / min and keep it for 10 hours; then follow a heating rate of 10°C / min. Heating rate, the temperature was raised to 950°C and kept for 10 hours; finally cooled naturally to obtain the spinel lithiu...

Embodiment 3

[0050] A method for preparing a high-conductivity lithium titanate negative electrode material for a lithium battery, comprising the following process steps:

[0051] A. Weigh the lithium-containing compound and the titanium-containing oxide respectively in a ball mill jar according to the molar ratio of lithium ion and titanium ion as Li:Ti=0.82:1, add deionized water as a dispersant, and perform ball milling to obtain a uniform mixture mixed slurry;

[0052] B. Transport the mixed slurry obtained in step A to a spray dryer for granulation and drying to obtain a dry precursor powder;

[0053] C. Put the precursor powder obtained in step B into a high-temperature furnace for roasting. First, raise the temperature from room temperature to 550°C at a heating rate of 5.5°C / min and keep it for 7 hours; then follow the heating rate of 5.5°C / min Heating rate, the temperature was raised to 850°C and kept for 7 hours; finally cooled naturally to obtain the spinel lithium titanate mat...

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Abstract

The invention relates to a preparation method for a high-conductivity lithium titanate cathode material of a lithium battery, and belongs to the technical field of cathode materials of lithium ion batteries. Firstly, better lithium titanate crystals can be obtained by preparing pure spinel lithium titanate, and the conductivity of the lithium titanate material can be improved by carrying out carbon covering at a later stage; and secondly, a solid-phase sintering method with low cost is adopted for the contribution to commercial application, the initial charge specific capacity of the produced lithium titanate material at the rate of 1 C (1 C is 175 mA / g) can reach 160 mAh / g, and the capacity can keep more than 95% after 500 times of circulation.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery. Specifically, the invention relates to a preparation method of a high conductivity lithium titanate negative electrode material of a lithium battery, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] Lithium-ion battery is a new type of rechargeable battery developed in the past ten years. Due to its high energy density, long life, no memory effect, and no pollution, lithium-ion batteries are widely used in portable electronic devices, electric vehicles, There are already many applications in power supply and other fields, and will gradually replace traditional lead-acid batteries and nickel-cadmium batteries that have short lifespan and pollute the environment. [0003] Most lithium-ion batteries currently in use use carbon materials as negative electrode materials, and graphite is t...

Claims

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Application Information

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IPC IPC(8): H01M4/485
CPCY02E60/10
Inventor 梁孜李明科阮晓莉王睿
Owner DONGFANG ELECTRIC CORP LTD
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