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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  • Summary
  • Abstract
  • Description
  • Claims
  • 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

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0044] The liquid phase preparation method of the foregoing anode material includes the following steps:

[0045] 1) Take the powder of the negative electrode substrate, add hard carbon source and 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 particles;

[0048] 4) Put the particulate matter into the carbonization equipment, heat it to 600-1350°C, preferably 1000-1200°C, in a protective atmosphere, keep it warm, and take it out after natural cooling to 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] Preferably, in step 2), the stirring time is 0.5-12h, among which the preferred time is 1-5h; in step 4), the holding time is 1-24h, ...

Example Embodiment

[0055] Embodiment 1: 0.5% sodium tetraphenylborate, 3% petroleum resin carbon source boron-doped modified high-rate negative electrode material

[0056] Take 1g of sodium tetraphenylborate (median particle size of 3 microns) and 6g of petroleum resin (median particle size of 7 microns), add 200g of graphite anode material (median particle size of 8.60 microns), transfer to a beaker, add 200mL Deionized water, stir for one hour, mix uniformly, and then granulate by spray drying. Transfer the granulated material into a tubular carbonization furnace, and heat to 1000°C under nitrogen atmosphere, heat for 5 hours, and cool down naturally After screening with a 325 mesh sieve, a boron-doped modified high-rate negative electrode material coated with 0.5% non-metal boron doped with 3% hard carbon is obtained. The prepared product is uniformly mixed with SP, CMC, and SBR according to the ratio of 95.2:1:1.9:1.9. After beating, coating, and rolling, the negative pole piece is formed on th...

Example Embodiment

[0058] Embodiment 2: 2.5% sodium tetraphenylborate dopant, 8% petroleum resin carbon source boron-doped modified high-rate negative electrode material.

[0059] Take 16g of petroleum resin (median particle size of 10 microns), 5g of sodium tetraphenylborate (median particle size of 5 microns) and 200g of graphite anode material (median particle size of 8.60 microns), transfer them into a beaker, and add 200mL Deionized water, stirred for one hour, mixed uniformly, and then granulated by spray drying. The granulated material was transferred to the tubular carbonization furnace, and heated to 1200°C under nitrogen atmosphere, heated for 10 hours, and cooled naturally. Obtain a negative electrode material. After passing the fluorine gas through a cooling medium containing calcium chloride and ice and a filter layer of sodium fluoride at 100°C, the fluorine gas is passed into the reaction furnace, and the negative electrode material is added to the reaction furnace. The reaction is c...

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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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