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A kind of negative electrode material of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied to battery electrodes, circuits, electrical components, etc., can solve the problems of poor high-rate charge and discharge performance, poor conductivity, etc., and achieve improved charge and discharge specific capacity, cycle stability, and production low cost effect

Inactive Publication Date: 2016-04-13
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to provide a negative electrode material for lithium ion batteries, namely lithium titanate material, which has poor electronic conductivity and poor high-rate charge and discharge performance in the prior art. compound coated lithium titanate

Method used

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  • A kind of negative electrode material of lithium ion battery and preparation method thereof
  • A kind of negative electrode material of lithium ion battery and preparation method thereof
  • A kind of negative electrode material of lithium ion battery and preparation method thereof

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preparation example Construction

[0043] 1. Preparation of negative pole piece:

[0044] The pure phase lithium titanate Li used in the embodiment 4 Ti 5 o 12 Or the negative electrode material of lithium ion battery, that is, the lithium titanate composite material coated with variable-valence metal oxide, conductive carbon black and binder polyvinylidene fluoride (PVDF) are mixed uniformly at a mass ratio of 90:10:10, and coated on copper Foil, dried and cut into negative pole pieces;

[0045] 2. Assembly of the button battery

[0046] With the above-mentioned negative electrode sheet as the negative electrode and lithium metal as the positive electrode, the electrolyte LiPF 6 The salt is dissolved in a mixed solution of ethylene carbonate (EC) / dimethyl carbonate (DMC) / ethyl methyl carbonate (EMC) with a mass ratio of 1:1:1 to form an electrolyte, and the concentration of the electrolyte is 1mol / L , assembled into coin cells in an argon glove box.

[0047] 3. Using the LAND battery test system to test ...

Embodiment 1

[0049] A lithium-ion battery negative electrode material, that is, a lithium titanate composite material coated with a variable-valence metal oxide, calculated on a molar ratio, wherein lithium in lithium titanate: metal in the variable-valence metal oxide is 4:0.03;

[0050] The variable price metal oxide is Co 3 o 4 .

[0051] The preparation method of above-mentioned a kind of lithium-ion battery negative electrode material, concrete steps are as follows:

[0052] After mechanically mixing 0.0241g of tricobalt tetroxide and 4.6g of pure-phase lithium titanate, add 10ml of anhydrous ethanol dispersant, ball mill on a ball mill for 2 hours, control the temperature at 80°C and continue to ball mill for 1 hour after vacuum drying to obtain the precursor;

[0053] Calculated according to the molar ratio, cobalt in tricobalt tetroxide: lithium in pure phase lithium titanate: absolute ethanol is 0.03:4:17;

[0054] Press the precursor on a powder tablet press to control the pre...

Embodiment 2

[0061] A lithium-ion battery negative electrode material, that is, a lithium titanate composite material coated with a variable-valence metal oxide, calculated on a molar ratio, wherein lithium in lithium titanate: metal in the variable-valence metal oxide is 4:0.02;

[0062] The variable price metal oxide is Cr 2 o 3 .

[0063] The preparation method of above-mentioned a kind of lithium-ion battery negative electrode material specifically comprises the following steps:

[0064]After mechanically mixing 0.08g of chromium nitrate and 4.6g of pure-phase lithium titanate, add 12ml of anhydrous ethanol dispersant, ball mill on a ball mill for 1h, control the temperature at 90°C and continue to ball mill for 0.5h after vacuum drying to obtain the precursor;

[0065] Calculated according to the molar ratio, that is, chromium in chromium nitrate: lithium in pure phase lithium titanate: absolute ethanol is 0.02:4:21;

[0066] Press the precursor on a powder tablet press to control ...

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Abstract

The invention discloses a lithium-ion battery negative electrode material and a preparation method thereof. The lithium-ion battery negative electrode material is a lithium titanate composite material coated with a variable-valence metal oxide. Calculated by molar ratio, that is, lithium in lithium titanate: The metal in the variable-valence metal oxide is 4:0.01-0.30. The preparation method is to mechanically mix lithium titanate and variable-valence metal compounds, add dispersant to ball mill, vacuum dry, ball mill again, and press into tablets, and finally heat up to 300-600°C under the protection of inert gas for sintering for 3-20 hours. When the temperature is lowered to room temperature, the lithium ion battery negative electrode material, that is, the lithium titanate composite material coated with variable-valence metal oxide is obtained. The negative electrode material of the lithium ion battery of the present invention has excellent specific capacity, fast charging and discharging performance and cycle stability, and its preparation method has the characteristics of rich raw material sources, simple preparation process, and is suitable for industrial scale production.

Description

technical field [0001] The invention relates to a key material of a lithium battery, in particular to a negative electrode material of a lithium ion battery, that is, a lithium titanate composite material coated with a variable-valence metal oxide and a preparation method thereof. Background technique [0002] With the development of science and technology, various increasingly popular portable electronic products and developing electric vehicles have put forward higher requirements on the energy density and service life of battery energy and many other aspects. Among many batteries, lithium-ion batteries have the characteristics of high voltage, high specific energy, long cycle life, and no environmental pollution, and have been widely used. [0003] In recent years, spinel lithium titanate Li 4 Ti 5 o 12 As an electrode material for a new type of energy storage battery, more and more attention is paid to it. This is because the crystal structure of spinel lithium titana...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485
CPCY02E60/10
Inventor 王保峰曹杰刘宇
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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