Lithium ion battery positive electrode material and preparation method thereof

A lithium-ion battery and cathode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low safety performance, and achieve the effect of uniform size and excellent electrochemical properties.

Active Publication Date: 2017-07-07
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preferred positive electrode active material for commercial lithium battery positive electrode is LiCoO 2 (lithium cobalt oxide), low safety performance

Method used

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  • Lithium ion battery positive electrode material and preparation method thereof
  • Lithium ion battery positive electrode material and preparation method thereof
  • Lithium ion battery positive electrode material and preparation method thereof

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preparation example Construction

[0014] The present invention also provides a method for preparing the above-mentioned positive electrode material, which method comprises dissolving cobalt salt and phosphate in an alcohol-containing aqueous solution to form a composite solution, adding the solution containing lithium salt dropwise to the stirring composite solution, and heating react to obtain a precursor, and heat and sinter the precursor in an inert atmosphere to obtain the positive electrode material.

[0015] In order to prevent the lithium cobalt phosphate particles from being oxidized during the sintering process, the precursor is heated and sintered in an inert atmosphere to obtain the positive electrode material. The inert atmosphere refers to any gas or gas that does not chemically react with the reactants and products. Gas mixture, such as nitrogen, one or more of the zero-group gases in the periodic table of elements. The inert atmosphere may be a static atmosphere, preferably a flowing atmosphere ...

Embodiment 1

[0026] This embodiment illustrates preparation lithium cobalt phosphate material provided by the present invention and preparation method;

[0027] Mix 0.06 mol cobalt salt, 0.06 mol (NH 4 ) 3 PO 4 Dissolved in 110ml of alcohol-containing aqueous solution to form a composite solution, the alcohol-containing aqueous solution is a mixed solution of dipropylene glycol and water, wherein the volume ratio of dipropylene glycol and water is 10:1;

[0028] Dissolve 0.06 moles of LiOH in deionized water to form 10ml of a lithium salt solution;

[0029] Heat the composite solution to 200°C and keep it warm in a water bath. At the same time, drop the solution containing lithium salt into the stirring composite solution at 10 drops / minute, and reflux for 6 hours to obtain a precursor. The precursor is placed in a nitrogen atmosphere. Heating and sintering at 700°C for 10 hours to obtain the positive electrode material A1;

[0030] The XRD diffraction pattern of this material measured...

Embodiment 2

[0033] This embodiment illustrates preparation lithium cobalt phosphate material provided by the present invention and preparation method;

[0034] 0.06 mol cobalt salt, 0.06 mol NH 4 h 2 PO 4 Dissolved in 110ml of alcohol-containing aqueous solution to form a composite solution, the alcohol-containing aqueous solution is a mixed solution of diethylene glycol and water, wherein the volume ratio of diethylene glycol and water is 20:1;

[0035] 0.06 mol Li 2 CO 3 Dissolve in deionized water to form 10ml of a solution containing lithium salt;

[0036] Heat the composite solution to 150°C and keep it warm in a water bath. At the same time, add the solution containing lithium salt dropwise to the stirring composite solution at 10 drops / minute, and reflux for 6 hours to obtain a precursor. The precursor is placed in a nitrogen atmosphere. Heating and sintering at 800° C. for 9 hours to obtain the positive electrode material A2.

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Abstract

The invention relates to a lithium ion battery positive electrode material and a preparation method thereof. The positive electrode material comprises a porous carbon sphere and a lithium cobalt phosphate material, wherein the lithium cobalt phosphate material is arranged in the porous carbon sphere, the peak intensity of X-ray diffraction peak of the lithium cobalt phosphate material conforms to the following: I<200>/I<131> is less than 1.5 but more than 0.8, the average grain size of the porous carbon sphere is 0.8-10 micrometers, the pore volume of the porous carbon sphere is (0.01-0.1) cm<3>/g and the carbon content of the positive electrode material is 2-10%. The lithium cobalt phosphate material obtained by employing the preparation method is uniform in particle size and excellent in electrochemical characteristics such as discharge specific capacity and cycle capacity retention ratio.

Description

technical field [0001] The invention provides a lithium cobalt phosphate and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high energy density, light weight, high reliability, low self-discharge, long cycle life, and no memory effect. Therefore, they are widely used in many fields such as portable electronic devices and electric vehicles. At present, the preferred positive electrode active material for commercial lithium battery positive electrode is LiCoO 2 (lithium cobalt oxide), low safety performance. LiCoPO with regular olivine type 4 (Lithium cobalt phosphate) has improved safety performance compared with lithium cobalt oxide. At the same time, the preparation method is simpler than lithium ferrous phosphate, and the product consistency is good, which is conducive to large-scale production. Contents of the invention [0003] The object of the present invention is to provide a lithium cobalt p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/587H01M4/62H01M4/1397H01M10/0525
CPCH01M4/1397H01M4/5825H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 张百爽焦晓朋李世彩
Owner BYD CO LTD
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