CN106992301A - A kind of nitrogen-doped graphene conductive agent and preparation method thereof, the lithium ion battery comprising the conductive agent - Google Patents
A kind of nitrogen-doped graphene conductive agent and preparation method thereof, the lithium ion battery comprising the conductive agent Download PDFInfo
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- CN106992301A CN106992301A CN201710258617.7A CN201710258617A CN106992301A CN 106992301 A CN106992301 A CN 106992301A CN 201710258617 A CN201710258617 A CN 201710258617A CN 106992301 A CN106992301 A CN 106992301A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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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 kind of nitrogen-doped graphene conductive agent and preparation method thereof, conductive agent comprises the following steps：Graphene oxide powder is prepared by raw material of graphite powder, using chemical vapour deposition technique, in atmospheric pressure state, under ammonia gas atmosphere is enclosed, high-temperature heating obtains the nitrogen-doped graphene material that doping is 4 8wt%；The heating-up temperature is 400~600 DEG C, and the heat time is 0.5~2h, and wherein the flow of ammonia is 50~300sccm.The present invention the conductive good, yield of nitrogen-doped graphene conductive agent is high, excellent performance and can grown on larger scale the characteristics of.
Description
Technical field
The present invention relates to nitrogen-doped graphene conductive agent technology field, particularly a kind of nitrogen-doped graphene conductive agent
And preparation method thereof, the lithium ion battery comprising the conductive agent.
Background technology
Lithium ion battery has that specific capacity is big, discharge voltage is high and steady, low temperature performance well, environment-friendly, safety, life-span
Ni-mh, the unrivaled advantage of NI-G secondary cell such as long, self discharge is faint.Since being come out from 1991, by more than 10 years
Development, lithium ion battery dominated the market of miniature portable battery, such as known mobile phone, notebook electricity
The battery of brain, miniature camera etc..With lithium ion battery performance it is perfect, treat to enter big with time lithium ion battery
The battery in the market of type electrokinetic cell, such as electric automobile.With the fast development of power lithium-ion battery, price costly,
The cobalt/cobalt oxide of resource-constrained can't bear the heavy load.Sight is transferred to aboundresources, environment-friendly, price just by researcher
Suitable Mn oxide, the material such as phosphate.The electrical conductivity of these materials is all very low, but also to keep good high rate charge-discharge
Characteristic, longer service life, this huge challenge that exactly industry of current driving force lithium ion battery is faced.As lithium from
The conductive agent of sub- battery important component, plays the role of important to improvement battery performance.Charge-discharge magnification can be improved, followed
The research and development of the novel conductive agent of ring stability, into an important topic of Study on Li-ion batteries.
Conventional lithium ion battery conductive agent has acetylene black, carbon black, Delanium, native graphite and graphene etc. at present.
Although Delanium and native graphite can effectively improve the specific capacity of lithium ion battery as conductive agent, with
The increase of charge-discharge magnification, specific capacity, which has, largely to be reduced, reason be composite polarization result in charging it is endless
Entirely, polarize and be largely attributable to poorly conductive, electronics can not be shifted rapidly.Carbon black is leading for conventional lithium ion battery
One of electric agent.Its is cheap, easy to use, but has coke charge oil mostly in black carbon surface, and this influences to a certain extent
Carbon black original electrical characteristics.Want to make lithium ion battery keep high rate charge-discharge performance then to need more carbon black, add
Amount will be up to 10 (wt) more than %, be unfavorable for industrialized production.Acetylene black performance relative electrical conductivity is preferable, but itself and active material
Contact point be contact, limit the performance of electric action, add conductive agent addition.Graphene as conductive agent, with
The contact point of active material is point-face contact, can be reduced the consumption of conductive agent with effects such as maximized performance conductive agents, carried
The energy density of liter lithium ion battery, but the laminated structure of graphene, can diffuse to form obstruction, so as to cause electricity to lithium ion
The high rate performance in pond declines.
The content of the invention
The main purpose of the present invention is the provision of a kind of nitrogen-doped graphene conductive agent and preparation method thereof and bag
Lithium ion battery containing the conductive agent, conductive good, yield is high, excellent performance and can grown on larger scale the characteristics of.
The present invention can be achieved through the following technical solutions：
The invention discloses a kind of nitrogen-doped graphene conductive agent, comprise the following steps：Oxygen is prepared by raw material of graphite powder
Graphite alkene powder, using chemical vapour deposition technique, in atmospheric pressure state, under ammonia gas atmosphere is enclosed, high-temperature heating is adulterated
Measure the nitrogen-doped graphene material for 4-8wt%；The heating-up temperature is 400~600 DEG C, and the heat time is 0.5~2h, wherein
The flow of ammonia is 50~300sccm.
Further, the ammonia flow is 300sccm, and described high-temperature temperature is 550 DEG C, and the time of the heating is
1h。
Further, the ammonia is high-purity ammon.
Meanwhile, the invention also discloses the N doping stone obtained by the preparation method according to above-mentioned nitrogen-doped graphene conductive agent
Black alkene conductive agent.
In addition, the invention also discloses a kind of lithium ion battery, including the preparation side of above-mentioned nitrogen-doped graphene conductive agent
Nitrogen-doped graphene conductive agent obtained by method.
Further, the positive electrode of the lithium ion battery is LiFePO4, LiMn2O4, nickle cobalt lithium manganate and/or cobalt
Sour lithium.
Further, the negative material of the lithium ion battery is Delanium, native graphite, carbonaceous mesophase spherules, silicon
Carbon composite and/or lithium titanate.
Further, the preparation method of the lithium ion battery includes positive plate making and negative plate makes；
Positive plate makes：Glue first is made in 5~10wt% binding agents and solvent, 1~3wt% modified graphene conductive agents are added
It is scattered, 75~90wt% positive electrode active materials are eventually adding, slurry is mixed into, viscosity is adjusted, pole is coated with out on aluminium foil
Piece, roll-in cutting obtains positive plate；
Negative plate makes：2~4wt% thickeners and deionized water are first configured to glue, 1~2wt% graphene conductive agent is added
It is scattered, 90~98wt% negative active core-shell material is added, finally Jia 2~4wt% binding agents, slurry is mixed into, viscosity is adjusted,
Pole piece is coated with out on copper foil, negative plate is obtained.
Further, the positive plate, negative plate are separated by coiling and molding between positive plate, negative plate using barrier film,
Electrolyte uses 1mol/L LiPF6Electrolyte.
Nitrogen-doped graphene conductive agent of the present invention has following beneficial technique effect：
The preparation method that the present invention is provided is simple, and raw material simplicity easily takes, simple to operate, it is easy to accomplish, the N doping prepared
Graphene.Lithium ion battery is applied to using the modified graphene as conductive agent.Reduce effectively addition and save cost,
The capacity of lithium ion battery can be effectively improved simultaneously, good material is provided for current resource scarcity problem, is possessed greatly
Application prospect.
Brief description of the drawings
Accompanying drawing 1 is the TEM test results of nitrogen-doped graphene conductive agent；
Accompanying drawing 2 is the Raman test result of nitrogen-doped graphene conductive agent；
Accompanying drawing 3 is the electric performance test result that nitrogen-doped graphene conductive agent is prepared as lithium ion battery.
Embodiment
In order that those skilled in the art will better understand the technical solution of the present invention, with reference to embodiment and to this
Invention product is described in further detail.
Embodiment 1
The invention discloses a kind of nitrogen-doped graphene conductive agent, its preparation method comprises the following steps：Using graphite powder as raw material
Graphene oxide powder is prepared, using chemical vapour deposition technique, in atmospheric pressure state, under ammonia gas atmosphere is enclosed, high temperature adds
Heat obtains the nitrogen-doped graphene material that doping is 8wt%；The heating-up temperature is 500 DEG C, and the heat time is 0.5h, wherein
The flow of ammonia is 300sccm.
Particularly, its concrete operations is as follows：
1., graphite powder is raw material to step.The graphite powder is commercial graphite powder（99.9 %, Chemical Reagent Co., Ltd., Sinopharm Group）
Using chemical oxidization method, 1~3 g graphite powders are weighed in 40~70 mL concentrated sulfuric acids, the g permanganic acid of 0.5~1.5 g sodium nitrate 4~9
0.5 h is reacted in potassium mixed solution.Add 140 mL deionized waters and stir 15 min, then add 500 mL water and 5~20 mL peroxides
Change hydrogen washing and watery hydrochloric acid（1:10）Washing.Centrifugal filtration again, 60 DEG C of oven for drying, obtains graphene oxide.
2. step, using chemical vapour deposition technique, weighs 0.1~1 g graphene oxides in quartz ampoule, flow 50~
400~600 DEG C of 0.5~2 h of processing of high temperature obtain nitrogen-doped graphene under 300 sccm ammonia atmospheres.
Embodiment 2
The invention discloses a kind of nitrogen-doped graphene conductive agent, its preparation method comprises the following steps：Using graphite powder as raw material
Graphene oxide powder is prepared, using chemical vapour deposition technique, in atmospheric pressure state, under ammonia gas atmosphere is enclosed, high temperature adds
Heat obtains the nitrogen-doped graphene material that doping is 6wt%；The heating-up temperature is 400 DEG C, and the heat time is 2h, wherein ammonia
The flow of gas is 175sccm.
Particularly, its concrete operations is as follows：
1., graphite powder is raw material to step.The graphite powder is commercial graphite powder（99.9 %, Chemical Reagent Co., Ltd., Sinopharm Group）
Using chemical oxidization method, 1~3 g graphite powders are weighed in 40~70 mL concentrated sulfuric acids, the g permanganic acid of 0.5~1.5 g sodium nitrate 4~9
0.5 h is reacted in potassium mixed solution.Add 140 mL deionized waters and stir 15 min, then add 500 mL water and 5~20 mL peroxides
Change hydrogen washing and watery hydrochloric acid（1:10）Washing.Centrifugal filtration again, 60 DEG C of oven for drying, obtains graphene oxide.
2. step, using chemical vapour deposition technique, weighs 0.1~1 g graphene oxides in quartz ampoule, flow 50~
400~600 DEG C of 0.5~2 h of processing of high temperature obtain nitrogen-doped graphene under 300 sccm ammonia atmospheres.
Embodiment 3
The invention discloses a kind of nitrogen-doped graphene conductive agent, its preparation method comprises the following steps：Using graphite powder as raw material
Graphene oxide powder is prepared, using chemical vapour deposition technique, in atmospheric pressure state, under ammonia gas atmosphere is enclosed, high temperature adds
Heat obtains the nitrogen-doped graphene material that doping is 4wt%；The heating-up temperature is 600 DEG C, and the heat time is 1.25h, wherein
The flow of ammonia is 50sccm.
Particularly, its concrete operations is as follows：
1., graphite powder is raw material to step.The graphite powder is commercial graphite powder（99.9 %, Chemical Reagent Co., Ltd., Sinopharm Group）
Using chemical oxidization method, 1~3 g graphite powders are weighed in 40~70 mL concentrated sulfuric acids, the g permanganic acid of 0.5~1.5 g sodium nitrate 4~9
0.5 h is reacted in potassium mixed solution.Add 140 mL deionized waters and stir 15 min, then add 500 mL water and 5~20 mL peroxides
Change hydrogen washing and watery hydrochloric acid（1:10）Washing.Centrifugal filtration again, 60 DEG C of oven for drying, obtains graphene oxide.
2. step, using chemical vapour deposition technique, weighs 0.1~1 g graphene oxides in quartz ampoule, flow 50~
400~600 DEG C of 0.5~2 h of processing of high temperature obtain nitrogen-doped graphene under 300 sccm ammonia atmospheres.
Embodiment 4
The invention discloses a kind of nitrogen-doped graphene conductive agent, its preparation method comprises the following steps：Using graphite powder as raw material
Graphene oxide powder is prepared, using chemical vapour deposition technique, in atmospheric pressure state, under ammonia gas atmosphere is enclosed, high temperature adds
Heat obtains the nitrogen-doped graphene material that doping is 5wt%；The heating-up temperature is 550 DEG C, and the heat time is 1.5h, wherein
The flow of ammonia is 200sccm.
Particularly, its concrete operations is as follows：
1., graphite powder is raw material to step.The graphite powder is commercial graphite powder（99.9 %, Chemical Reagent Co., Ltd., Sinopharm Group）
Using chemical oxidization method, 1~3 g graphite powders are weighed in 40~70 mL concentrated sulfuric acids, the g permanganic acid of 0.5~1.5 g sodium nitrate 4~9
0.5 h is reacted in potassium mixed solution.Add 140 mL deionized waters and stir 15 min, then add 500 mL water and 5~20 mL peroxides
Change hydrogen washing and watery hydrochloric acid（1:10）Washing.Centrifugal filtration again, 60 DEG C of oven for drying, obtains graphene oxide.
2. step, using chemical vapour deposition technique, weighs 0.1~1 g graphene oxides in quartz ampoule, flow 50~
400~600 DEG C of 0.5~2 h of processing of high temperature obtain nitrogen-doped graphene under 300 sccm ammonia atmospheres.
Embodiment 5
The invention discloses a kind of nitrogen-doped graphene conductive agent, its preparation method comprises the following steps：Using graphite powder as raw material
Graphene oxide powder is prepared, using chemical vapour deposition technique, in atmospheric pressure state, under ammonia gas atmosphere is enclosed, high temperature adds
Heat obtains the nitrogen-doped graphene material that doping is 7wt%；The heating-up temperature is 450 DEG C, and the heat time is 0.9h, wherein
The flow of ammonia is 100sccm.
Particularly, its concrete operations is as follows：
1., graphite powder is raw material to step.The graphite powder is commercial graphite powder（99.9 %, Chemical Reagent Co., Ltd., Sinopharm Group）
Using chemical oxidization method, 1~3 g graphite powders are weighed in 40~70 mL concentrated sulfuric acids, the g permanganic acid of 0.5~1.5 g sodium nitrate 4~9
0.5 h is reacted in potassium mixed solution.Add 140 mL deionized waters and stir 15 min, then add 500 mL water and 5~20 mL peroxides
Change hydrogen washing and watery hydrochloric acid（1:10）Washing.Centrifugal filtration again, 60 DEG C of oven for drying, obtains graphene oxide.
2. step, using chemical vapour deposition technique, weighs 0.1~1 g graphene oxides in quartz ampoule, flow 50~
400~600 DEG C of 0.5~2 h of processing of high temperature obtain nitrogen-doped graphene under 300 sccm ammonia atmospheres.
Embodiment 6
The invention discloses a kind of lithium ion battery, including nitrogen obtained by the preparation method of above-mentioned nitrogen-doped graphene conductive agent is mixed
Miscellaneous graphene conductive agent., the positive electrode of the lithium ion battery is LiFePO4.The negative material of the lithium ion battery is
Native graphite.
The preparation method of the lithium ion battery includes positive plate and made and negative plate making；
Positive plate makes：Glue first is made in 5~10wt% binding agents and solvent, 1~3wt% modified graphene conductive agents are added
It is scattered, 75~90wt% positive electrode active materials are eventually adding, slurry is mixed into, viscosity is adjusted, pole is coated with out on aluminium foil
Piece, roll-in cutting obtains positive plate；
Negative plate makes：2~4wt% thickeners and deionized water are first configured to glue, 1~2wt% graphene conductive agent is added
It is scattered, 90~98wt% negative active core-shell material is added, finally Jia 2~4wt% binding agents, slurry is mixed into, viscosity is adjusted,
Pole piece is coated with out on copper foil, negative plate is obtained；
Then positive plate, negative plate are separated by coiling and molding between positive plate, negative plate using barrier film, and electrolyte is used
1mol/L LiPF6Electrolyte.
Embodiment 7
The invention discloses a kind of lithium ion battery, including nitrogen obtained by the preparation method of above-mentioned nitrogen-doped graphene conductive agent is mixed
Miscellaneous graphene conductive agent., the positive electrode of the lithium ion battery is cobalt acid lithium.The negative material of the lithium ion battery is behaved
Make graphite.
The preparation method of the lithium ion battery includes positive plate and made and negative plate making；
Positive plate makes：Glue first is made in 5~10wt% binding agents and solvent, 1~3wt% modified graphene conductive agents are added
It is scattered, 75~90wt% positive electrode active materials are eventually adding, slurry is mixed into, viscosity is adjusted, pole is coated with out on aluminium foil
Piece, roll-in cutting obtains positive plate；
Negative plate makes：2~4wt% thickeners and deionized water are first configured to glue, 1~2wt% graphene conductive agent is added
It is scattered, 90~98wt% negative active core-shell material is added, finally Jia 2~4wt% binding agents, slurry is mixed into, viscosity is adjusted,
Pole piece is coated with out on copper foil, negative plate is obtained；
Then positive plate, negative plate are separated by coiling and molding between positive plate, negative plate using barrier film, and electrolyte is used
1mol/L LiPF6Electrolyte.
Embodiment 8
The invention discloses a kind of lithium ion battery, including nitrogen obtained by the preparation method of above-mentioned nitrogen-doped graphene conductive agent is mixed
Miscellaneous graphene conductive agent., the positive electrode of the lithium ion battery is LiMn2O4, nickle cobalt lithium manganate.The lithium ion battery
Negative material is carbonaceous mesophase spherules.
The preparation method of the lithium ion battery includes positive plate and made and negative plate making；
Positive plate makes：Glue first is made in 5~10wt% binding agents and solvent, 1~3wt% modified graphene conductive agents are added
It is scattered, 75~90wt% positive electrode active materials are eventually adding, slurry is mixed into, viscosity is adjusted, pole is coated with out on aluminium foil
Piece, roll-in cutting obtains positive plate；
Negative plate makes：2~4wt% thickeners and deionized water are first configured to glue, 1~2wt% graphene conductive agent is added
It is scattered, 90~98wt% negative active core-shell material is added, finally Jia 2~4wt% binding agents, slurry is mixed into, viscosity is adjusted,
Pole piece is coated with out on copper foil, negative plate is obtained；
Then positive plate, negative plate are separated by coiling and molding between positive plate, negative plate using barrier film, and electrolyte is used
1mol/L LiPF6Electrolyte.
Embodiment 9
The invention discloses a kind of lithium ion battery, including nitrogen obtained by the preparation method of above-mentioned nitrogen-doped graphene conductive agent is mixed
Miscellaneous graphene conductive agent., the positive electrode of the lithium ion battery is LiFePO4, LiMn2O4, nickle cobalt lithium manganate and cobalt acid lithium.
The negative material of the lithium ion battery is Delanium, native graphite, carbonaceous mesophase spherules, Si-C composite material and metatitanic acid
Lithium.
The preparation method of the lithium ion battery includes positive plate and made and negative plate making；
Positive plate makes：Glue first is made in 5~10wt% binding agents and solvent, 1~3wt% modified graphene conductive agents are added
It is scattered, 75~90wt% positive electrode active materials are eventually adding, slurry is mixed into, viscosity is adjusted, pole is coated with out on aluminium foil
Piece, roll-in cutting obtains positive plate；
Negative plate makes：2~4wt% thickeners and deionized water are first configured to glue, 1~2wt% graphene conductive agent is added
It is scattered, 90~98wt% negative active core-shell material is added, finally Jia 2~4wt% binding agents, slurry is mixed into, viscosity is adjusted,
Pole piece is coated with out on copper foil, negative plate is obtained；
Then positive plate, negative plate are separated by coiling and molding between positive plate, negative plate using barrier film, and electrolyte is used
1mol/L LiPF6Electrolyte.
Meanwhile, concrete application expansion is carried out for embodiment 6, the product obtained using embodiment 3 is made to as conductive agent
To 18650 types section battery, the embodiment that is applied 1~8, contrast Application Example 1 carry out the electric performance test of full battery, its
Specifying information is as follows：
The Application Example situation explanation of table 1
Contrast Application Example 1：Other conditions are with Application Example 3, the difference is that the use of undoped with modified graphene being to lead
Electric agent, by with the condition same reaction conditions of Application Example 3, the capacity for being finally assembling to lithium ion battery is
1161.3mAh。
As can be seen that modified graphene has castering action to the performance of lithium battery from comparative example.
From table 1 from the point of view of result, the condition of embodiment 3 is optimal, capacity highest.
In order to further illustrate the difference of Application Example and contrast Application Example 1 in New Year, respectively to used in both
Grapheme material carry out TEM, RAMAN test and electric performance test, specific test result is as depicted in figs. 1 and 2.
From Fig. 1, a figures are the high power scanning electron microscope (SEM) photograph of graphene after N doping, and b figures are transmission electron microscope pictures.
From Fig. 2, Raman collection of illustrative plates can be seen that, the D peak intensities of nitrogen-doped graphene are significantly stronger than unmodified graphene, say
Bright graphene successfully enter by doping.
Fig. 3 is to be assembled into the full battery of lithium ion（Model 18650）Obtained cycle life figure is tested by new Weir afterwards, from
Can be seen that in figure, it is nitrogen-doped modified after graphene performance be substantially better than undoped with graphene, and cycle life substantially carries
It is high.
The foregoing is only a preferred embodiment of the present invention, not makees any formal limitation to the present invention；It is all
The those of ordinary skill of the industry can be shown in by specification and described above and swimmingly implement the present invention；But, it is all to be familiar with
Professional and technical personnel without departing from the scope of the present invention, makes using disclosed above technology contents
A little variation, modification and evolution equivalent variations, be the present invention equivalent embodiment；Meanwhile, all realities according to the present invention
Variation, modification and evolution of any equivalent variations that matter technology is made to above example etc., still fall within the technology of the present invention
Within the protection domain of scheme.
Claims (9)
1. a kind of preparation method of nitrogen-doped graphene conductive agent, it is characterised in that comprise the following steps：Using graphite powder as raw material
Graphene oxide powder is prepared, using chemical vapour deposition technique, in atmospheric pressure state, under ammonia gas atmosphere is enclosed, high temperature adds
Heat obtains the nitrogen-doped graphene material that doping is 4-8wt%；The heating-up temperature is 400~600 DEG C, and the heat time is 0.5
~2h, wherein ammonia flow are 50~300sccm.
2. the preparation method of nitrogen-doped graphene conductive agent according to claim 1, it is characterised in that：The ammonia flow is
300sccm, described high-temperature temperature is 550 DEG C, and the time of the heating is 1h.
3. the preparation method of nitrogen-doped graphene conductive agent according to claim 2, it is characterised in that：The ammonia is high-purity
Ammonia.
4. the nitrogen according to any one of claims 1 to 3 claim obtained by the preparation method of nitrogen-doped graphene conductive agent
Doped graphene conductive agent.
5. a kind of lithium ion battery, it is characterised in that：Including N doping graphite described in any one of claims 1 to 3 claim
Nitrogen-doped graphene conductive agent obtained by the preparation method of alkene conductive agent.
6. lithium ion battery according to claim 5, it is characterised in that：The positive electrode of the lithium ion battery is ferric phosphate
Lithium, LiMn2O4, nickle cobalt lithium manganate and/or cobalt acid lithium.
7. lithium ion battery according to claim 5, it is characterised in that：The negative material of the lithium ion battery is artificial stone
Ink, native graphite, carbonaceous mesophase spherules, Si-C composite material and/or lithium titanate.
8. lithium ion battery according to claim 7, it is characterised in that：Its preparation method includes positive plate and made and negative plate
Make；
Positive plate makes：Glue first is made in 5~10wt% binding agents and solvent, 1~3wt% modified graphene conductive agents are added
It is scattered, 75~90wt% positive electrode active materials are eventually adding, slurry is mixed into, viscosity is adjusted, pole is coated with out on aluminium foil
Piece, roll-in cutting obtains positive plate；
Negative plate makes：2~4wt% thickeners and deionized water are first configured to glue, 1~2wt% graphene conductive agent is added
It is scattered, 90~98wt% negative active core-shell material is added, finally Jia 2~4wt% binding agents, slurry is mixed into, viscosity is adjusted,
Pole piece is coated with out on copper foil, negative plate is obtained.
9. lithium ion battery according to claim 7, it is characterised in that：The positive plate, negative plate are by coiling and molding, just
Separated between pole piece, negative plate using barrier film, electrolyte uses 1mol/L LiPF6Electrolyte.
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| CN108346791A (en) * | 2018-02-09 | 2018-07-31 | 中国矿业大学 | Lithium ion battery silicon/nitrogen-doped graphene composite material and preparation method thereof and application |
| CN108423671A (en) * | 2018-05-30 | 2018-08-21 | 西北大学 | A kind of high thermal stability I2 doping graphene film and preparation method thereof |
| CN109449398A (en) * | 2018-10-23 | 2019-03-08 | 辽宁大学 | A kind of preparation method and applications of lithium ion battery conductive agent nitrogen-doped graphene |
| CN109524652A (en) * | 2018-11-16 | 2019-03-26 | 华南师范大学 | A kind of covalent organic frame/graphene compositing organic material and preparation method and the application in lithium/anode material of lithium-ion battery |
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