Conductive additive for lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and conductive additives, applied in battery electrodes, circuits, electrical components, etc., can solve the problem that the regular deposition of carbon clusters can only occur on certain substrates, and it is difficult to separate pure graphene from graphene , unable to carry out large-scale production and other problems, to achieve the effect of easy control of the process, enhanced rate charge and discharge performance, and increased cycle life

Active Publication Date: 2011-11-30
BTR NEW MATERIAL GRP CO LTD
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AI Technical Summary

Problems solved by technology

[0007] In the above method, for the mechanical exfoliation method, only a small amount of graphene can be obtained and it is difficult to separate pure single-layer or several-layer graphene; for the heating SiC method, although it can be achieved by controlling the heating temperature Control the number of layers of graphene, but the reaction conditions are harsh and cannot be mass-produced; chemical vapor deposition also has the same problem, the regular deposition of carbon clusters can only occur on some specific substrates and the number of layers is difficult to precisely control; The operation of the carbon nanotube cutting method is at the nanometer level, which requires extremely high equipment precision. Currently, it can only be studied at the laboratory level.

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  • Conductive additive for lithium ion battery and preparation method thereof
  • Conductive additive for lithium ion battery and preparation method thereof
  • Conductive additive for lithium ion battery and preparation method thereof

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preparation example Construction

[0042] The preparation method of the lithium ion battery conductive additive of the present invention adopts oxidation, stripping, reduction preparation process, comprises the following steps:

[0043] 1. Oxidation of graphite: at room temperature, put a strong acidic solution in a container, use a DC-2006 low-temperature constant temperature bath from Ningbo Xinzhi Biotechnology Co., Ltd., and cool it to 0-4°C in a water bath, preferably 0°C, and place the graphite Add the mixture of powder and nitrate into the above strong acid solution, and use the JJ-1 timing electric mixer of Jincheng Guosheng Experimental Instrument Factory in Jintan City, Jiangsu Province to slowly add a strong oxidant at a stirring speed of 60-3000rpm, and wait until strong After the oxidant is added, continue to stir for 0.5-12h, then control the temperature of the mixture within the range of 32-38°C, continue to stir for 0.5-12h, then slowly add 0.5-4 times the volume, preferably 2 times the strength ...

Embodiment 1

[0067] The graphene powder that embodiment 1 prepares, after testing, specific surface area is 200-400m 2 / g, the conductivity is 5×10 4 -9×10 4 S / m. Such as figure 1 As shown, the particle size distribution is black powder between 5-50μm. Such as figure 2 As shown, it is a carbonaceous material composed of 5-500 layers of parallel or nearly parallel graphene sheets.

[0068] The graphene powder prepared in Example 1 is combined with the lithium iron phosphate positive electrode material, and the preparation method of the positive electrode sheet is as follows: lithium iron phosphate positive electrode material, conductive additive, and binder PVDF are in a mass ratio of 94:3: 3. Using NMP as a solvent, stir in a mixer at a speed of 2000rpm for 4 hours, apply the evenly mixed slurry on an aluminum foil, dry it at 120°C, and then roll it to obtain a positive pole piece; The diaphragm and the negative pole piece were wound, liquid injected, and packaged in sequence to pre...

Embodiment 2

[0077] The negative electrode sheets used in Example 2 and Comparative Example 2 are the same, and the manufacturing method is the same as that of the negative electrode sheets in Example 1 and Comparative Example 1. The electrical performance tests of Example 2 and Comparative Example 2 are shown in Table 3.

[0078] Table 3 embodiment 2 and comparative example 2 electrical performance test results

[0079]

[0080] Composite the graphene powder prepared in Example 3 with natural graphite, a negative electrode material for lithium-ion batteries, to make a negative electrode for the battery. The production method of the negative electrode sheet is as follows: graphite negative electrode material, conductive additive graphene powder, binder SBR, thickener CMC according to the mass ratio of 94:2:2.5:1.5, with water as the solvent, in the mixer with a speed of 1500rpm Stir for 3 hours, coat the uniformly mixed slurry on the copper foil, dry at 100°C, and then roll to obtain t...

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Abstract

The invention discloses a lithium ion battery conductive additive and a preparation method thereof, and solves the technical problems of improving the conductive performance and cycle life of anode and cathode materials of a lithium ion battery. The lithium ion battery conductive additive is graphene, is black powder with grain size distribution of between 10 nanometers and 100 microns, and is a carbonaceous material consisting of single or 1,000 parallel or approximately parallel graphene lamellae. The preparation method comprises oxidization and stripping reduction. Compared with the prior art, the additive has higher electric conductivity; when the additive is applied to the electrode material, the performance of the conventional battery can be greatly improved only by a little amount; the material serving as the conductive additive has good conductive performance, is easy for dispersion, and can effectively enhance the conductive performance and the magnification charging and discharging performance of the electrode material of the lithium ion battery and prolong the cycle life; and the preparation method has low requirements for raw materials and equipment, is easy to control the process, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to a lithium-ion battery material and a preparation method thereof, in particular to a conductive additive for a lithium-ion battery material and a preparation method thereof. technical background [0002] In the research on lithium-ion battery anode materials and conductive agents, carbonaceous materials, which were the first to be studied and applied to the commercialization of lithium-ion batteries, are still one of the focuses of everyone's attention and research. The focus of future research is still how to improve Good utilization of cheap natural graphite and development of valuable amorphous carbon materials. Lithium-ion secondary batteries in the prior art mainly use conductive graphite, acetylene black and carbon nanotubes as conductive additives. Acetylene black is a chain of spherical amorphous carbon particles, and is currently the most widely used conductive additive. The price is low, but in order to achieve the pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62C01B31/00C01B31/04
CPCY02E60/12Y02E60/10
Inventor 岳敏张少波时浩梁奇梅佳
Owner BTR NEW MATERIAL GRP CO LTD
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