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Cathode active material of lithium ion secondary battery, preparation method of cathode active material, cathode pole piece of lithium ion secondary battery and lithium ion secondary battery

A negative electrode active material, secondary battery technology, applied in secondary batteries, active material electrodes, battery electrodes, etc., can solve the problems of low charge and discharge performance, poor fast charging performance, poor fast charging ability, etc. The effect of high, lowering the reverse lithium storage stress barrier, and increasing the binding site of lithium storage

Active Publication Date: 2017-06-27
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the first aspect of the present invention provides a negative electrode active material for a lithium-ion secondary battery, which has high energy density, high rate charge and discharge characteristics, and especially has fast charging capability at low temperature, so as to solve the problem of existing common carbon The material has low high-current charge and discharge performance, and poor fast charge performance, especially the problem of poor fast charge ability at low temperature

Method used

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  • Cathode active material of lithium ion secondary battery, preparation method of cathode active material, cathode pole piece of lithium ion secondary battery and lithium ion secondary battery
  • Cathode active material of lithium ion secondary battery, preparation method of cathode active material, cathode pole piece of lithium ion secondary battery and lithium ion secondary battery
  • Cathode active material of lithium ion secondary battery, preparation method of cathode active material, cathode pole piece of lithium ion secondary battery and lithium ion secondary battery

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preparation example Construction

[0051] Correspondingly, the embodiment of the present invention also provides a preparation method of the negative electrode active material of the lithium ion secondary battery, comprising the following steps:

[0052] Mix carbon materials, amorphous carbon raw materials and ionic liquids to obtain a mixture; put the mixture into a reaction kettle, and pass a mixed gas of small organic molecules containing doping elements and an inert carrier gas, at 500-1200 The negative electrode active material of the lithium ion secondary battery is obtained by keeping the temperature for 1-12 hours at a temperature of ℃, and the negative electrode active material of the lithium ion secondary battery includes a carbon material inner core and a coating formed on the surface of the carbon material inner core layer, the material of the cladding layer includes amorphous carbon and a doping element, the doping element includes nitrogen, the cladding layer has a single-layer structure, and the d...

Embodiment 1

[0077] A preparation method for a negative electrode active material of a lithium ion secondary battery, comprising the following steps:

[0078] (1) Weigh 3.0kg of artificial graphite, 0.3kg of petroleum pitch crushed to less than 0.1mm, and 0.02kg of phenolic resin, stir evenly and put them into the reaction kettle, heat and coat at 500°C for 2 hours, and then pass nitrogen gas Protection, carbonization treatment at 1000°C for 4 hours, and then cooling the reaction product to room temperature to obtain artificial graphite coated with amorphous carbon;

[0079] (2) cetyltrimethylammonium bromide (CTAB, 0.5kg) is dissolved in the HCl (8L, 1mol / L) solution of ice-water bath to obtain the first mixed solution, and the above-mentioned gained amorphous carbon-coated Add 2.0kg of artificial graphite to the above first mixed solution, ultrasonically disperse for 30 minutes, then add ammonium persulfate (APS, 0.8kg) into it, immediately form a white suspension, stir for 0.5 hours, th...

Embodiment 2

[0083] A preparation method for a negative electrode active material of a lithium ion secondary battery, comprising the following steps:

[0084] (1) Dissolve cetyltrimethylammonium bromide (CTAB, 0.5kg) in the HCl (8L, 1mol / L) solution in ice-water bath to obtain the first mixed solution, take 2.0kg of artificial graphite and add it to the above-mentioned first In a mixed solution, ultrasonically disperse for 30 minutes, then add ammonium persulfate (APS, 0.8kg) therein, immediately form a white suspension, after stirring for 0.5 hours, add 0.5L pyrrole monomer to obtain the second mixed solution, The second mixed solution was incubated and reacted at 4° C. for 24 hours and then filtered to obtain a black precipitate. The black precipitate was washed three times with 1 mol / L HCl solution, and then washed with pure water until the solution was colorless and neutral. Then the precipitate was dried at 80° C. for 12 hours to obtain the dried precipitate; then the dried precipitat...

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Abstract

The invention provides a cathode active material of a lithium ion secondary battery. The cathode active material comprises a carbon material core and a coating layer formed on the surface of the carbon material core, wherein the coating layer contains amorphous carbon and doping elements, and the doping elements include a nitrogen element. A carbon material is taken as a core of the cathode active material for the lithium ion secondary battery, and the coating layer containing the amorphous carbon and doping elements is arranged on the surface of the carbon material, so that the cathode active material has the advantages of long service life, high capacity, high magnifying power charge and discharge characteristics and low cost; by utilizing the cathode active material, the charging velocity of the battery can be effectively increased, and particularly, the rapid charging capacity of the battery at a low temperature can be effectively increased. The invention further provides a preparation method of the cathode active material, a cathode pole piece of the lithium ion secondary battery and the lithium ion secondary battery.

Description

technical field [0001] The invention relates to the field of lithium ion secondary batteries, in particular to a lithium ion secondary battery negative electrode active material and a preparation method, a lithium ion secondary battery negative pole piece and a lithium ion secondary battery. Background technique [0002] At present, with the rapid development of electronic technology, electronic products have become an indispensable necessity for human life, but the progress of battery energy density is far behind the development speed of electronic technology, so it has become one of the bottlenecks of electronic products. Fast charging is a popular technology direction that has attracted much attention in the past 1-2 years and doubled the user experience. [0003] The negative electrode material is one of the most critical materials for fast charging of lithium-ion batteries. However, the common carbon materials commonly used in the existing negative electrode materials h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/366H01M4/587H01M10/0525H01M2004/021Y02E60/10C01B32/05C01B32/21C01P2002/02C01P2002/54C01P2004/84C01P2006/40H01M2004/027
Inventor 梁家华夏圣安谢封超
Owner HUAWEI TECH CO LTD
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