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Cathode active material, preparation method thereof and battery

A negative electrode active material and quality technology, applied in the field of lithium-ion secondary batteries, can solve problems such as battery expansion

Inactive Publication Date: 2013-06-19
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that when the lithium titanate material is used as the negative electrode active material in the prior art, the expansion of the battery is serious, thereby providing a negative electrode active material with a small battery expansion

Method used

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  • Cathode active material, preparation method thereof and battery
  • Cathode active material, preparation method thereof and battery

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preparation example Construction

[0024] A method for preparing a negative electrode active material, comprising: coating the metal additive on the surface of the lithium titanium oxide compound or mixing it with the lithium titanium oxide compound.

[0025] The lithium titanyl oxide compound can be prepared by methods known to those skilled in the art (such as solid-phase method, liquid-phase method, sol-gel method, etc.), and can also be obtained commercially.

[0026] Wherein, the metal additive is coated on the surface of the lithium titanium oxide compound.

[0027] Coating can be achieved by methods known to those skilled in the art. For example, the lithium titanyl oxide compound is impregnated in the slurry containing the metal additive, filtered and dried to coat a layer of the metal additive on the surface of the lithium titanyl oxide compound.

[0028] Other encapsulation methods may also be used. The present invention is realized by chemical encapsulation.

[0029] The chemical coating refers to...

Embodiment 1

[0059] Preparation of negative electrode active material:

[0060] CdO with an average particle size of 6 μm and Li with an average particle size of 20 μm 4 Ti 5 o 12 According to the mass ratio of 9.2:92 (that is, 8:92 in terms of Cd), it is sent into a ball mill and mixed for 3 hours to form a mixed powder.

[0061] Put the above mixed powder into the tubular heating furnace, and continuously feed H 2 gas, sintered at 600°C for 6h, in H 2 Cool to room temperature in atmosphere to obtain the final product.

[0062] The final product is Li 4 Ti 5 o 12 The surface is covered with Cd, wherein the Cd content is 8wt% negative electrode active material. It is denoted as Q1.

Embodiment 2

[0064] Preparation of negative electrode active material:

[0065] ZnO with an average particle size of 5 μm and Li with an average particle size of 20 μm 4 Ti 4.8 Mg 0.2 o 12 Send it into a ball mill at a mass ratio of 6.22:95 (that is, 5:95 in terms of Zn), and mix for 3 hours to form a fully mixed powder.

[0066] Put the above mixed powder into the tubular heating furnace, and continuously feed H 2 , sintered at 500°C for 5h, in H 2 Gradually cooled to room temperature under atmosphere to obtain the final product.

[0067] The final product is Li 4 Ti 5 o 12 The surface is covered with Zn, wherein the Zn content is 5wt% negative electrode active material. It is denoted as Q2.

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Abstract

The invention provides a cathode active material. The cathode active material comprises a lithium titanium oxygen compound the general formula of which is Li3+3xTi6-3x-yMyO12, wherein x is greater than or equal to 0 and less than or equal to 1 / 3, y is greater than or equal to 0 and less than or equal to 0.25, M comprises one or some of Fe, Al, Ca, Co, B, Cr, Ni, Mg, Zr, Ga, V, Mn and Zn; and the cathode active material also comprises a metallic addition, wherein the metallic addition comprises one or some of Pb, Cd, Zn, Sn, Cu, Mn, Ti, Fe, Mo, Ni, Co, Pd, W and Au. The invention also discloses a preparation method of the cathode active material and a battery using the cathode active material. The cathode active material provided by the invention can effectively solve the problem of battery swelling when lithium titanate materials are used as the cathode active material.

Description

technical field [0001] The invention relates to the field of lithium ion secondary batteries, in particular to a negative electrode active material, a preparation method and a battery. Background technique [0002] Lithium titanate is an anode material that has attracted much attention of researchers in recent years. Its volume change is less than 1%, and it is called a "zero strain" material, which has good battery cycle performance. The equilibrium potential of lithium titanate is high, the deposition of metal lithium is avoided during the charging process, and its platform capacity exceeds 85% of the total capacity, the voltage rises rapidly at the end of charging, and the charging termination signal is obvious, so the safety performance is also better than carbon negative electrode high. In addition, the chemical diffusion coefficient of lithium titanate is an order of magnitude larger than that of carbon negative electrode materials, and the high-current charge and di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/52H01M4/50H01M4/62H01M4/04H01M10/36H01M10/40
CPCY02E60/12Y02E60/10
Inventor 潘虹谷潘福中江文锋夏玉刘彦初刘国刚屈丽辉
Owner BYD CO LTD