CN112687879A - Conductive agent of graphene lithium ion battery - Google Patents
Conductive agent of graphene lithium ion battery Download PDFInfo
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- CN112687879A CN112687879A CN202011574853.8A CN202011574853A CN112687879A CN 112687879 A CN112687879 A CN 112687879A CN 202011574853 A CN202011574853 A CN 202011574853A CN 112687879 A CN112687879 A CN 112687879A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a conductive agent of a graphene lithium ion battery. Relates to the technical field of lithium ion batteries. The method comprises the following raw materials: 90-110 parts of graphene, 30-40 parts of carbon nano tube, 80-100 parts of cyclic carbonate, 50-70 parts of acetone, 5-10 parts of hexadecyl trimethyl ammonium bromide and 5-10 parts of polyacrylic acid. And provides a preparation method. The invention discloses a conductive agent of a graphene lithium ion battery, which has the technical effects of prolonging the service life and the performance of the battery, reducing the cost and ensuring that the capacity retention rate is more than 93 percent.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a conductive agent of a graphene lithium ion battery.
Background
A lithium ion battery is a secondary battery (rechargeable battery) that mainly operates by movement of lithium ions between a positive electrode and a negative electrode. During charging and discharging, Li+Intercalation and deintercalation to and from two electrodes: upon charging, Li+The lithium ion battery is extracted from the positive electrode and is inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.
The conductive agent is used for ensuring that the electrode has good charge and discharge performance, a certain amount of conductive substances are usually added during the manufacture of the pole piece, and the effect of collecting micro-current is achieved among active substances and between the active substances and a current collector, so that the movement rate of electrons accelerated by the contact resistance of the electrode is reduced, and meanwhile, the migration rate of lithium ions in the electrode material can be effectively improved, and the charge and discharge efficiency of the electrode is improved.
However, the conventional conductive agent needs to be improved in terms of manufacturing cost, improvement of battery performance and service life.
Therefore, how to provide a conductive agent for a graphene lithium ion battery, which significantly improves the service life and performance of the battery is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a conductive agent for a graphene lithium ion battery. The invention reduces the cost by optimizing the proportion of the raw materials, and simultaneously improves the dispersion performance by adding the raw materials with dispersion and bonding properties, and simultaneously avoids the problems of increased internal resistance of the battery or obviously increased heat productivity caused by adding too much bonding raw materials.
In order to achieve the purpose, the invention adopts the following technical scheme:
a conductive agent of a graphene lithium ion battery comprises the following raw materials in parts by weight: 90-110 parts of graphene, 30-40 parts of carbon nano tube, 80-100 parts of cyclic carbonate, 50-70 parts of acetone, 5-10 parts of hexadecyl trimethyl ammonium bromide and 5-10 parts of polyacrylic acid.
Preferably: the material comprises the following raw materials in parts by weight: 100 parts of graphene, 35 parts of carbon nano tubes, 90 parts of cyclic carbonate, 60 parts of acetone, 8 parts of hexadecyl trimethyl ammonium bromide and 7 parts of polyacrylic acid.
Has the advantages that: the graphene has good conductivity, the conductivity of the graphene is superior to that of a carbon nano tube, the graphene is matched and used in consideration of comprehensive cost, and the hexadecyl trimethyl ammonium bromide and the polyacrylic acid are added to improve the dispersibility and prolong the service life of the battery.
The invention also provides a preparation method of the conductive agent of the graphene lithium ion battery, which comprises the following steps:
(1) carrying out ball milling treatment on graphene and carbon nano tubes to obtain a mixed material;
(2) and mixing the mixed material, the cyclic carbonate and acetone, fully stirring, and adding hexadecyl trimethyl ammonium bromide and polyacrylic acid for ultrasonic treatment to obtain the conductive agent of the graphene lithium ion battery.
Has the advantages that: the conductive agent provided by the invention is simple in preparation process and easy for industrial production.
Preferably: the ball milling time in the step (1) is 1.5-2 h.
Has the advantages that: the ball milling method is adopted for processing, so that the raw materials can be fully crushed, and the conductive efficiency is improved.
Preferably: and (2) placing the ball mill in the step (1) under the protection of inert gas, wherein the inert gas is nitrogen.
Preferably: stirring at 500-1000 r/min in the step (2); the stirring time is 0.5-1 h.
Preferably: the frequency of the ultrasound in the step (2) is 20-30 kHz, and the power is 100-150W; the ultrasonic treatment time is 20-40 min.
Has the advantages that: the conductive agent is easier to diffuse or migrate, and the battery performance is improved.
The invention also provides a graphene lithium ion battery which comprises the conductive agent or the preparation method thereof.
According to the technical scheme, compared with the prior art, the conductive agent for the graphene lithium ion battery disclosed by the invention has the technical effects of prolonging the service life and the performance of the battery, reducing the cost and ensuring that the capacity retention rate is more than 93%.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a conductive agent of a graphene lithium ion battery. In the examples, the raw materials and processing equipment are all available from commercial sources, the brands are not required, and the processes not mentioned above, such as the detection method, are conventional processes and are not described herein.
Example 1
A conductive agent of a graphene lithium ion battery comprises the following raw materials: 90g of graphene, 30g of carbon nano tube, 80g of cyclic carbonate, 50g of acetone, 5g of hexadecyl trimethyl ammonium bromide and 5g of polyacrylic acid.
The preparation method is characterized by comprising the following steps:
(1) carrying out ball milling treatment on graphene and carbon nano tubes to obtain a mixed material;
(2) and mixing the mixed material, the cyclic carbonate and acetone, fully stirring, and adding hexadecyl trimethyl ammonium bromide and polyacrylic acid for ultrasonic treatment to obtain the conductive agent of the graphene lithium ion battery.
In order to further optimize the technical scheme: the ball milling time in the step (1) is 1.5 h.
In order to further optimize the technical scheme: and (2) placing the ball mill in the step (1) under the protection of inert gas, wherein the inert gas is nitrogen.
In order to further optimize the technical scheme: stirring at 500r/min in the step (2); the stirring time was 0.5 h.
In order to further optimize the technical scheme: the ultrasonic parameter of the step (2) is 20kHz, and the power is 100W; the ultrasonic treatment time is 20 min.
Example 2
A conductive agent of a graphene lithium ion battery comprises the following raw materials: 100g of graphene, 35g of carbon nano tube, 90g of cyclic carbonate, 60g of acetone, 8g of hexadecyl trimethyl ammonium bromide and 7g of polyacrylic acid.
The preparation method is characterized by comprising the following steps:
(1) carrying out ball milling treatment on graphene and carbon nano tubes to obtain a mixed material;
(2) and mixing the mixed material, the cyclic carbonate and acetone, fully stirring, and adding hexadecyl trimethyl ammonium bromide and polyacrylic acid for ultrasonic treatment to obtain the conductive agent of the graphene lithium ion battery.
In order to further optimize the technical scheme: the ball milling time in the step (1) is 1.5 h.
In order to further optimize the technical scheme: and (2) placing the ball mill in the step (1) under the protection of inert gas, wherein the inert gas is nitrogen.
In order to further optimize the technical scheme: stirring at 800r/min in the step (2); the stirring time was 1 h.
In order to further optimize the technical scheme: the ultrasonic parameter of the step (2) is 25kHz, and the power is 130W; the ultrasonic treatment time is 30 min.
Example 3
A conductive agent of a graphene lithium ion battery comprises the following raw materials: 110g of graphene, 40g of carbon nano tube, 100g of cyclic carbonate, 70g of acetone, 10g of hexadecyl trimethyl ammonium bromide and 10g of polyacrylic acid.
The preparation method is characterized by comprising the following steps:
(1) carrying out ball milling treatment on graphene and carbon nano tubes to obtain a mixed material;
(2) and mixing the mixed material, the cyclic carbonate and acetone, fully stirring, and adding hexadecyl trimethyl ammonium bromide and polyacrylic acid for ultrasonic treatment to obtain the conductive agent of the graphene lithium ion battery.
In order to further optimize the technical scheme: the ball milling time in the step (1) is 2 hours.
In order to further optimize the technical scheme: and (2) placing the ball mill in the step (1) under the protection of inert gas, wherein the inert gas is nitrogen.
In order to further optimize the technical scheme: stirring at 1000r/min in the step (2); the stirring time was 1 h.
In order to further optimize the technical scheme: the ultrasonic parameter of the step (2) is 30kHz, and the power is 150W; the sonication time was 40 min.
Comparative experiment:
comparative example 1
The difference from example 1 is that graphene is entirely replaced with carbon nanotubes;
comparative example 2
The difference from example 1 is that cetyltrimethylammonium bromide was not added;
comparative example 3
The difference from the example 1 is that 25 to 35g of polyacrylic acid is added.
The conductive agents prepared in examples 1 to 3 and comparative examples 1 to 3 were used for preparing lithium ion batteries (60 ℃ C., 2C rate), and the batteries were tested, and the results are shown in the following table 1:
TABLE 1
The results show that: the conductive agent prepared by the invention can obviously improve the performance of the lithium battery, is obviously superior to a comparative example, and improves the capacity retention rate and the conductivity of the lithium battery.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The conductive agent of the graphene lithium ion battery is characterized by comprising the following raw materials in parts by weight: 90-110 parts of graphene, 30-40 parts of carbon nano tube, 80-100 parts of cyclic carbonate, 50-70 parts of acetone, 5-10 parts of hexadecyl trimethyl ammonium bromide and 5-10 parts of polyacrylic acid.
2. The conductive agent of the graphene lithium ion battery according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 100 parts of graphene, 35 parts of carbon nano tubes, 90 parts of cyclic carbonate, 60 parts of acetone, 8 parts of hexadecyl trimethyl ammonium bromide and 7 parts of polyacrylic acid.
3. The preparation method of the conductive agent for the graphene lithium ion battery according to claim 1 or 2, characterized by comprising the steps of:
(1) carrying out ball milling treatment on graphene and carbon nano tubes to obtain a mixed material;
(2) and mixing the mixed material, the cyclic carbonate and acetone, fully stirring, and adding hexadecyl trimethyl ammonium bromide and polyacrylic acid for ultrasonic treatment to obtain the conductive agent of the graphene lithium ion battery.
4. The preparation method of claim 3, wherein the ball milling time in the step (1) is 1.5-2 h.
5. The method of claim 3, wherein the ball mill of step (1) is under an inert gas blanket, and the inert gas is nitrogen.
6. The method according to claim 3, wherein the stirring in the step (2) is 500 to 1000 r/min; the stirring time is 0.5-1 h.
7. The preparation method according to claim 3, wherein the ultrasonic wave in the step (2) has a frequency of 20 to 30kHz and a power of 100 to 150W; the ultrasonic treatment time is 20-40 min.
8. A graphene lithium ion battery, characterized by comprising the conductive agent of claim 1 or 2, or the preparation method comprises the method of any one of claims 3 to 7.
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| CN202011574853.8A CN112687879A (en) | 2020-12-28 | 2020-12-28 | Conductive agent of graphene lithium ion battery |
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| CN202011574853.8A CN112687879A (en) | 2020-12-28 | 2020-12-28 | Conductive agent of graphene lithium ion battery |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932287A (en) * | 2016-05-24 | 2016-09-07 | 宁波墨西科技有限公司 | Graphene composite conductive agent and preparation method thereof |
| CN106902701A (en) * | 2015-12-21 | 2017-06-30 | 天津瑞赛可新材料科技有限公司 | A kind of graphene dispersion agent |
| CN111916743A (en) * | 2020-07-30 | 2020-11-10 | 广东博力威科技股份有限公司 | Negative electrode composite conductive agent, preparation method thereof, lithium ion battery containing negative electrode composite conductive agent and preparation method thereof |
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- 2020-12-28 CN CN202011574853.8A patent/CN112687879A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106902701A (en) * | 2015-12-21 | 2017-06-30 | 天津瑞赛可新材料科技有限公司 | A kind of graphene dispersion agent |
| CN105932287A (en) * | 2016-05-24 | 2016-09-07 | 宁波墨西科技有限公司 | Graphene composite conductive agent and preparation method thereof |
| CN111916743A (en) * | 2020-07-30 | 2020-11-10 | 广东博力威科技股份有限公司 | Negative electrode composite conductive agent, preparation method thereof, lithium ion battery containing negative electrode composite conductive agent and preparation method thereof |
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Application publication date: 20210420 |