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A boron doping modified hard carbon coating negative electrode material with high rate performance and a liquid phase preparation method thereof

A negative electrode material, boron doping technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems that it is difficult to meet the high rate charge and discharge, the general rate performance of graphite materials, and difficult large-scale application, etc., to achieve Less pollution, increased layer spacing, and economical raw materials

Active Publication Date: 2019-01-04
HUZHOU CHUANGYA POWER BATTERY MATERIALS
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  • Application Information

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Problems solved by technology

However, the rate performance of graphite materials is average, and it is difficult to meet the requirements of high rate charge and discharge.
At present, the anode materials used in high-rate power lithium batteries are mainly hard carbon materials, but hard carbon itself is expensive, and the first effect is too low, the capacity is low, and it is difficult to apply on a large scale

Method used

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  • A boron doping modified hard carbon coating negative electrode material with high rate performance and a liquid phase preparation method thereof
  • A boron doping modified hard carbon coating negative electrode material with high rate performance and a liquid phase preparation method thereof
  • A boron doping modified hard carbon coating negative electrode material with high rate performance and a liquid phase preparation method thereof

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preparation example Construction

[0044] The liquid-phase preparation method of above-mentioned negative electrode material, comprises the following steps:

[0045] 1) taking the powder of the negative electrode substrate, adding a hard carbon carbon source and a boron compound to the powder to obtain a mixed powder;

[0046] 2) Transfer the mixed powder into a container, add a solvent, stir and disperse evenly to obtain a slurry;

[0047] 3) drying and granulating the slurry to obtain granules;

[0048] 4) Put the particulate matter into the carbonization equipment, under protective atmosphere, heat to 600-1350°C, preferably 1000-1200°C, keep it warm, take it out after natural cooling, and obtain the negative electrode material;

[0049] 5) Sieving the negative electrode material to obtain a finished product.

[0050] Preferably, in step 2), the solvent is at least one of water, ethanol and ethylene glycol.

[0051] As a preference, in step 2), the stirring time is 0.5-12h, wherein the preferred time is 1-...

Embodiment 1

[0055] Example 1: Boron-doped modified high-rate negative electrode material with 0.5% sodium tetraphenylborate and 3% petroleum resin carbon source

[0056] Take 1g of sodium tetraphenylborate (the median particle size is 3 microns) and 6g of petroleum resin (the median particle size is 7 microns) and add 200g of graphite negative electrode material (the median particle size is 8.60 microns), transfer it to a beaker, and add 200mL Deionized water, stirred for one hour, mixed evenly, and then granulated by spray drying, the granulated material was transferred to a tubular carbonization furnace, heated to 1000°C under a nitrogen atmosphere, heated for 5 hours, and cooled naturally After sieving with a 325-mesh sieve, a boron-doped modified high-rate negative electrode material coated with 0.5% of non-metallic boron doped with 3% of hard carbon is obtained. 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,...

Embodiment 2

[0058] Example 2: Boron-doped modified high-rate negative electrode material with 2.5% sodium tetraphenylborate dopant and 8% petroleum resin carbon source.

[0059] Get 16g petroleum resin (median particle diameter is 10 microns), 5g sodium tetraphenylborate (median particle diameter is 5 microns) and 200g graphite negative electrode material (median particle diameter is 8.60 microns), transfer in the beaker, add 200mL Deionized water, stirred for an hour, mixed evenly, and then granulated by spray drying, the granulated material was transferred to a tubular carbonization furnace, and heated to 1200°C in a nitrogen atmosphere, heated for 10 hours, and cooled naturally. Obtain the negative electrode material. 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 f...

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Abstract

The invention relates to the field of lithium batteries, and discloses a boron doping modified hard carbon coating negative electrode material with high rate performance and a liquid phase preparationmethod thereof. A hard carbon carbon layer is formed on the surface of a negative electrode substrate after carbonization by a hard carbon carbon source, boron oxide is generated by decomposing a boron-oxygen compound at a high temperature, and a composite structure such as boron-carbon bond and boron-carbon-oxygen bond is formed on the surface of the negative electrode substrate at a high temperature. On the one hand, compared with other negative electrode materials, hard carbon has larger interlayer spacing and better rate charge-discharge performance. Through hard carbon coating, the highrate charge-discharge performance of negative electrode materials can be improved. On the other hand, by doping boron into the negative electrode material, the position of carbon atom in the crystal lattice of other negative electrode materials is replaced by boron atom, and the atomic radius of boron atom itself is larger than that of carbon atom, which leads to the increase of the interlayer spacing of the negative electrode material and the magnification performance of the material.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a boron-doped modified hard carbon-coated negative electrode material with high rate performance and a liquid-phase preparation method thereof. Background technique [0002] In recent years, with the increasing demand for power battery energy storage equipment such as electric buses and fast-charge lithium batteries for mobile phones, the energy field, especially lithium-ion batteries and supercapacitors, has attracted widespread attention. At present, the negative electrode material of lithium-ion batteries widely used in industry is graphite carbon material. At present, the charging rate requirement for high-rate negative electrode materials is usually 4C or 5C charge and discharge, and the power energy storage batteries of power buses even require negative electrode materials to meet 10C, 20C and even higher rate pulse charge and discharge. [0003] Graphite anode material ha...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M10/0525
CPCH01M4/366H01M4/38H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 刘朗蔡新辉赵苏平袁旭闻世杰刘锐剑吕猛胡博
Owner HUZHOU CHUANGYA POWER BATTERY MATERIALS
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