Preparation method of lithium ion battery electrode active material

A technology for electrode active materials and lithium-ion batteries, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of inhomogeneity, high cost of raw materials, low activity, etc., and achieve uniform particle size distribution and high tap density , The effect of less lattice defects

Active Publication Date: 2014-01-15
JIANGSU HUADONG INST OF LI ION BATTERY +1
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Problems solved by technology

Among them, the sol-gel method can achieve atomic-level mixing of the raw materials for the synthesis of lithium titanate, and prepare nano-lithium titanate with good conductivity, but due to high raw material costs, excessive consumption of organic reagents, poor operability, etc. Problems make this method difficult to use on an industrial scale
The solid-phase synthesis method has simple process and low cost, and is suitable for large-scale production, but the lithium titanate particles synthesized by the solid-phase method are easy to agglomerate and have uneven size, and the activity is not high, which leads to poor electrochemical performance of lithium titanate materials. not tall

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  • Preparation method of lithium ion battery electrode active material
  • Preparation method of lithium ion battery electrode active material
  • Preparation method of lithium ion battery electrode active material

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preparation example Construction

[0016] The first embodiment of the present invention provides a preparation method of lithium-ion battery electrode active material, which comprises the following steps:

[0017] S1, providing a lithium source and titanium dioxide, mixing the lithium source and titanium dioxide to form a mixture, and grinding the mixture for the first time to obtain a plurality of precursor particles;

[0018] S2, pre-calcining the precursor particles at 500°C to 600°C to obtain a plurality of first intermediate particles;

[0019] S3, grinding the plurality of first intermediate particles for a second time, and performing second sintering at 800°C to 1000°C to obtain a plurality of second intermediate particles; and

[0020] S4, grinding the plurality of second intermediate particles for a third time, and performing a third sintering at 500° C. to 700° C. to obtain a plurality of spinel lithium titanate particles.

[0021] In the above step S1, the lithium source may be lithium salt, lithium...

Embodiment 1

[0062] (a) Take 2.7281g of lithium carbonate, 7.2989g of anatase-type titanium dioxide, and 20ml of ethanol solution, put them together in an agate jar, add an appropriate amount of agate balls, and ball mill at a speed of 400rmp for 4 hours to obtain a mixed slurry, and then force the mixed slurry Ultrasound for 1 hour to reduce particle agglomeration, vacuum dry at 60°C for 2 hours, and then sieve with a 400-mesh sieve to obtain multiple precursor particles;

[0063] (b) Put the above-mentioned precursor particles in a muffle furnace, raise the temperature to 500°C at a rate of 5°C / min in an air environment under normal pressure and keep it warm for 6 hours, and cool naturally after the heat preservation is completed to obtain multiple first intermediates particles;

[0064] (c) Put the above-mentioned first intermediate particles in an agate jar, add an appropriate amount of agate balls, mill at a speed of 500 rpm for 4 h, and perform the second grinding. After the second g...

Embodiment 2

[0073] (a) Add 50ml of ethanol, 1g of lithium titanate particles (LTO) prepared in Example 1, 0.3725g of styrene monomer and 0.0077g of benzoyl peroxide (BPO) initiator into a three-necked flask, and stir with magnetic force Stir to make it evenly mixed;

[0074] (b) Heating to 80°C under stirring conditions, reacting at 80°C for 2 hours, and then placing it in a constant temperature device at 150°C for 10 hours to obtain a mixed solution containing lithium titanate particles coated with polystyrene on the surface;

[0075] (c) Suction filter the above mixed solution to obtain polystyrene-coated lithium titanate particles, and wash the lithium titanate particles with methanol;

[0076] (d) The polystyrene-coated lithium titanate particles were vacuum-dried at 80°C for 12h, placed in a tube furnace under N2 protection, and sintered at 600°C for 1h to obtain carbon-coated lithium titanate particles.

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Abstract

The invention relates to a preparation method of a lithium ion battery electrode active material. The method comprises the steps that: lithium source and titanium oxide are provided, and are mixed into a mixture; the mixture is subjected to first grinding, such that a plurality of precursor particles are obtained; the precursor particles are pre-sintered under a temperature of 500-600 DEG C, such that a plurality of first intermediate particles are obtained; the plurality of first intermediate particles are subjected to second grinding, and are subjected to second sintering under a temperature of 800-1000 DEG C, such that a plurality of second intermediate particles are obtained; and the plurality of second intermediate particles are subjected to third grinding, and are subjected to third sintering under a temperature of 500-700 DEG C, such that spinel lithium titanate particles are obtained.

Description

technical field [0001] The invention relates to a preparation method of an electrode active material of a lithium ion battery, in particular to a preparation method of a lithium titanate electrode active material. Background technique [0002] In recent years, spinel lithium titanate (Li 4 Ti 5 o 12 ) as an electrode active material for a new type of energy storage battery has been paid more and more attention. This is because the crystal structure of spinel lithium titanate can maintain a high degree of stability during the lithium ion intercalation-deintercalation process. Lithium titanate is known as a "zero-strain" electrode active material because of its small change in lattice constant and small volume change. This can avoid the structural damage caused by the back and forth expansion and contraction of the electrode active material during the charge-discharge cycle, thereby improving the cycle performance and service life of the electrode, reducing the attenuation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62
CPCC01G23/00H01M4/366H01M4/485H01M4/625C01G23/005C01P2002/32C01P2002/72C01P2004/04C01P2004/62C01P2004/80Y02E60/10
Inventor 付安安高剑李建军王莉何向明尚玉明王要武
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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