A boron-doped negative electrode material with good high-temperature performance and a solid-phase preparation method thereof

A technology of negative electrode material and high temperature performance, which is applied in the field of boron-doped negative electrode material and its solid-phase preparation, can solve the problems such as the difficulty of large-scale application of non-metallic doping modification, and achieve the characteristics of easy promotion, reduction of defects and unique structure design. Effect

Active Publication Date: 2019-01-04
HUZHOU CHUANGYA POWER BATTERY MATERIALS
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Problems solved by technology

[0005] In order to simplify the preparation method and overcome the disadvantage that non-metal doping modification is difficult to apply on a large scale, the present invention provides a boron-doped negative electrode material with good high-temperature performance and a solid-phase preparation method thereof

Method used

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  • A boron-doped negative electrode material with good high-temperature performance and a solid-phase preparation method thereof
  • A boron-doped negative electrode material with good high-temperature performance and a solid-phase preparation method thereof
  • A boron-doped negative electrode material with good high-temperature performance and a solid-phase preparation method thereof

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preparation example Construction

[0037] The solid phase preparation method of above-mentioned negative electrode material, comprises the following steps:

[0038] 1) Take the powder of the negative electrode substrate, add a boron compound to the powder, then add it to a high-speed mixer, and stir evenly to obtain a mixed powder;

[0039] 2) transfer the mixed powder of the mixed powder into a carbonization equipment, and heat it to 600-1200° C. under a protective atmosphere, preferably 800-1000° C., keep it warm, take it out after natural cooling, and obtain the negative electrode material;

[0040] 3) 3) Sieving the negative electrode material to obtain a finished negative electrode material.

[0041] As a preference, in step 1), the stirring time is 1-10 h, preferably 1-5 h.

[0042] As a preference, in step 2), the holding time is 1-24h, preferably 3-10h.

[0043] Preferably, in step 3), the median particle size of the obtained negative electrode material is 1-30 microns, preferably 3-10 microns.

[00...

Embodiment 1

[0046] Example 1: Boron-doped high-temperature negative electrode material doped with 2% boric acid dopant.

[0047] Take 4g of boric acid powder (median particle size is 3 microns) and add 200g of graphite negative electrode material (median particle size is 6.60 μm), then add it to a high-speed mixer, stir rapidly for 1 hour, after mixing evenly, transfer to alumina In the crucible, under a nitrogen atmosphere, heat up to 1000° C., heat for 10 hours, and then sieve through a 325-mesh sieve to obtain a boron-doped high-temperature negative electrode material with a doping ratio of 2% boric acid. The prepared product was uniformly mixed with SP, CMC, and SBR according to the ratio of 95.2:1:1.9:1.9, and after beating, coating, and rolling, a negative electrode sheet was formed on a copper grid, and then a lithium sheet was used as a counter electrode to make a button battery. Conduct charge and discharge tests, and use lithium cobalt oxide as the positive electrode to conduct ...

Embodiment 2

[0049] Example 2: Boron-doped high-temperature negative electrode material doped with 0.5% boric acid dopant.

[0050] Take 1g of boric acid powder (the median particle size is 5 microns) and add 200g of graphite negative electrode material (the median particle size is 6.60 μm), and then add it to a high-speed mixer, stir rapidly for 1 hour, and after mixing evenly, transfer to alumina In the crucible, under a nitrogen atmosphere, the temperature was raised to 1100° C., heated for 10 hours, and the negative electrode material was obtained after natural cooling. Pass the fluorine gas through the cooling medium containing calcium chloride and ice and the filter layer of sodium fluoride at 100 °C in sequence, then pass it into the reaction furnace, add the negative electrode material into the reaction furnace, and react at 425 °C for 5 hours to obtain the primary modified negative electrode material. Take 130g of the primary modified negative electrode material and add it to 1L ...

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Abstract

The invention relates to the field of lithium batteries, and discloses a boron-doped negative electrode material with good high temperature performance and a solid-phase preparation method thereof. Asa boron oxide compound is used as a dopant, the boron oxide compound is decomposed to generate boron oxide at high temperature directly through a solid-phase reaction, and the boron oxide is controlled to react with the surface of the negative electrode material. The structure of the material of the invention is characterized in that the composite structure of a boron-carbon bond and boron-carbon-oxygen bond and the like is formed on the surface of the negative electrode material from the original defect state. By surface modification, on the one hand, On the other hand, the surface defects of the negative electrode material can be reduced by the composite reaction of boron oxide and the surface of the negative electrode material, so that the specific surface area of the negative electrode material can be greatly reduced, and the side reaction of the negative electrode material with the electrolyte at high temperature can be reduced by the smaller specific surface area, and the high temperature performance can be obviously improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a boron-doped negative electrode material with good high-temperature performance and a solid phase preparation method thereof. Background technique [0002] In recent years, the energy field, especially Li-ion batteries and supercapacitors, has attracted much attention due to the growing demand for portability and high-performance energy storage devices. At present, the negative electrode material of lithium-ion batteries widely used in industry is graphite carbon material, but its operating temperature is usually around 25°C at room temperature. It is easy to have side reactions with the electrolyte during the insertion and extraction process, the electrolyte is consumed rapidly, and gas is generated, causing the lithium battery to swell, the capacity rapidly decays, and the safety is greatly reduced. Therefore, it is very important to develop negative electrode materials with g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/052
CPCH01M4/362H01M4/583H01M4/62H01M4/628H01M10/052Y02E60/10
Inventor 刘朗郭挺袁旭蔡新辉王祥廉刘锐剑吕猛胡博
Owner HUZHOU CHUANGYA POWER BATTERY MATERIALS
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