Cathodic active material as well as preparation method and battery thereof

A technology of negative electrode active material and crystal plane, which is applied in the field of negative electrode active material and its preparation and battery, can solve the problems of low tap density of lithium vanadium oxide and imperfect crystal shape of the material, and achieves excellent electrochemical performance, perfect crystal shape, The effect of high tap density

Inactive Publication Date: 2010-10-06
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium vanadium oxide with a higher tap density and a more perfect material crystal form in order to overcome the shortcomings of the negative electrode active material lithium vanadium oxide prepared in the prior art that the tap density is not high and the crystal form of the material is not perfect. negative electrode active material

Method used

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  • Cathodic active material as well as preparation method and battery thereof
  • Cathodic active material as well as preparation method and battery thereof
  • Cathodic active material as well as preparation method and battery thereof

Examples

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preparation example Construction

[0025] The present invention also provides the preparation method of this kind of negative electrode active material, wherein, LiVO 2 The preparation steps of the material include:

[0026] (1) ball milling lithium source, vanadium source and carbon source to obtain a precursor;

[0027] (2) processing the precursor prepared in step (1) through isostatic pressing;

[0028] (3) Sinter the isostatically pressed precursor in step (2) under inert gas or reducing gas or vacuum conditions to obtain LiVO 2 .

[0029] Wherein, isostatic pressing is various isostatic pressing known to those skilled in the art, can be cold isostatic pressing or hot isostatic pressing, the pressure that the present invention adopts isostatic pressing is preferably 50-400MPa, more preferably 200-350MPa , After isostatic pressing treatment, the uniform contact between powder particles can be increased, which is conducive to the uniform diffusion of the reaction of substances during heat treatment.

[0...

Embodiment 1

[0041] (1) Preparation of negative electrode active material

[0042] 81.28 lithium carbonate, 163.69 grams of vanadium pentoxide, 22.8 grams of sucrose and 1.60 grams of titanium dioxide are placed in a ball mill jar, mixed with 280 milliliters of absolute ethanol, so that the reactant can be completely dispersed in ethanol, and the mixture is mixed on a planetary ball mill at 350 The precursor mixture was obtained after ball milling at a rotational speed of rpm for 8 hours. The precursor mixture was air-dried and ball-milled for 5 hours to obtain a dispersed powder, which was formed on a powder tablet press at 2 MPa, and the formed rough body was then pressed in an isostatic pressure of 300 MPa. After isostatic pressure treatment, put the mixture into a vacuum carbon tube furnace, first use inert gas to discharge the air in the furnace, and then use a mechanical pump or an oil diffusion pump to vacuumize, the vacuum degree is 10 -5 Below Pascal, the temperature starts to ri...

Embodiment 2

[0052] The negative electrode active material was prepared by the same method as in Example 1, except that the raw material in the ball mill tank also contained 2.88 grams of molybdenum trioxide, and the carbon content in the generated negative electrode active material was 0.010% by weight.

[0053] The tap density of the prepared negative electrode active material measured by the same method as in Example 1 is 2.12g / em3; LiVO 2 The 003 crystal plane diffraction peak intensity I 003 Diffraction peak intensity with 104 crystal plane I 104 The ratio is 1.221, and the FWHM of the 003 crystal plane diffraction peak is 0.199.

[0054] A battery was prepared by the same method as in Example 1, except that the negative electrode active material was the negative electrode active material prepared in Example 2.

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Abstract

The invention provides a cathodic active material comprising LiVO2, wherein the tap density of a LiVO2 material is 1.5 to 2.2g / cm3, the ratio of the intensity I003 of the diffraction peak of a 003 crystal face to the intensity I104 of the diffraction peak of a 104 crystal face is 0.9 to 1.8, and the full width at half maximum of the diffraction peak of the 003 crystal face is 0.17 to 0.25. The material has large tap density, perfect crystal form and superior electrochemical performance, and the capacity of the mass ratio of the prepared battery is very large and can reach 339mAh / g, which is beneficial to the development of traditional small-sized and light-duty batteries and meets the development requirements of the traditional battery. Moreover, the invention provides a preparation method of the material. The process is simple, solves the corrosion of a traditional preparation method to equipment well, enhances the rate of finished products, saves the cost and is beneficial to the industrial scale.

Description

technical field [0001] The invention relates to a negative electrode active material, a preparation method thereof and a battery. Background technique [0002] As a new type of green storage battery, lithium-ion battery has the advantages of high working voltage, light weight, large specific energy, low self-discharge rate, long cycle life, no memory effect, and no environmental pollution. It has a very important role in the development of rechargeable batteries. Broad application prospects. [0003] At present, graphite is the most commonly used anode material for lithium-ion batteries. However, the volume density of graphite is low (nominal density is 2.2 g / cm3), which greatly limits its volume specific capacity; and graphite can have side reactions with electrolyte at higher potentials, posing safety hazards. It is imperative to find a new type of negative electrode material with high volume specific energy. [0004] In the existing research, the low-valence lithium va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48C01G31/02H01M4/04H01M10/36H01M10/40H01M4/02
CPCC23C14/225H01L21/02631Y02E10/543Y02E10/541C23C14/24H01L31/03923H01L31/0322H01L21/02491H01L21/02568C23C14/505H01L31/1828H01L31/03925C23C14/0623H01L21/02422Y02P70/50
Inventor 杨玮李芬徐茶清姜占锋
Owner BYD CO LTD
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