CN103474693A - Lithium ion battery and preparation method thereof - Google Patents
Lithium ion battery and preparation method thereof Download PDFInfo
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- CN103474693A CN103474693A CN2012101876964A CN201210187696A CN103474693A CN 103474693 A CN103474693 A CN 103474693A CN 2012101876964 A CN2012101876964 A CN 2012101876964A CN 201210187696 A CN201210187696 A CN 201210187696A CN 103474693 A CN103474693 A CN 103474693A
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Abstract
The invention provides a lithium ion battery which comprises a cathode, an anode, a separator between the cathode and the anode, and a electrolyte; the cathode active material is graphite with a specific surface area of 1-20 m<2>/g, the anode active material is graphene or a graphene derivative with a specific surface area of 200-1500 m<2>/g, and the mass ratio of the anode active material to the cathode active material is 1:3-15. Additionally, the invention provided a preparation method of the lithium ion battery. The energy storage mechanism of the cathode active material and the anode active material of the lithium ion battery is an ion intercalation-deintercalation mechanism, so that charge storage capability of the electrode is improved and the capacity of the whole system is improved. The preparation method of the lithium ion battery is simple in operation.
Description
Technical field
The present invention relates to electrochemical field, relate in particular to a kind of lithium ion battery and preparation method thereof.
Background technology
Society, information, the energy and new material become important developing direction and pillar industry in the world.When society is constantly progressive, oneself becomes the key of sustainable development the energy and environmental problem.Be accompanied by the global non-renewable energy resources that reduce gradually and increasingly serious environmental problem, the development and application of new forms of energy is very urgent.Chemical power source has that energy conversion efficiency is high, energy density is high, noise-less pollution, can arbitrarily combine, random characteristics such as mobile.Lithium ion battery is a kind of portable chemical power supply that current specific energy is the highest, and it has, and voltage is high, specific energy is large, discharging voltage balance, cryogenic property is good, security performance is excellent and the advantages such as storage and long working life.Fast development along with electronics and information industry, mobile communication, digital processor, portable computer are widely applied, the development of the development of space technology and the demand of defence equipment and electric automobile and the exploitation to chemical power source particularly the demand of high-energy secondary battery increase rapidly, the research of lithium ion battery with the application also more and more paid attention to.
Commercial lithium ion battery is mainly to using metal oxide (LiFePO4, cobalt acid lithium, LiMn2O4 etc.) as positive electrode at present, but the positive electrode capacity is not high, embedding lithium speed becomes the bottleneck that lithium ion battery further develops slowly, in addition, adopting graphite to do its negative pole of anodal lithium ion battery is also to adopt graphite to do negative pole, but the embedding lithium capacity of the negative pole of graphite is the highest also with regard to 372mAh/g, therefore, need a kind of new system badly and improve lithium ion battery.
Summary of the invention
Given this, the present invention aims to provide a kind of lithium ion battery and preparation method thereof.Lithium ion battery provided by the invention, positive electrode active materials is that specific area is 1 ~ 20m
2the graphite of/g, negative active core-shell material is that specific area is 200 ~ 1500m
2the Graphene of/g or Graphene derivative, the energy storage mechanism of positive electrode active materials and negative active core-shell material is ion and embeds the mechanism that embedding goes out, and has improved electrode and has stored the ability of electric charge, thereby improved the capacity of whole system.Preparation method provided by the invention is simple to operate.
First aspect, the invention provides a kind of lithium ion battery, comprise positive pole, negative pole, the barrier film between positive pole and negative pole and electrolyte, positive pole comprises aluminium foil and is coated in the positive electrode on aluminium foil, negative pole comprises aluminium foil and is coated in the negative material on aluminium foil, positive electrode comprises positive electrode active materials, binding agent and the conductive agent that mass ratio is 85 ~ 90:5 ~ 10:5 ~ 10, and positive electrode active materials is that specific area is 1 ~ 20m
2the graphite of/g, negative material comprises negative active core-shell material, binding agent and the conductive agent that mass ratio is 85 ~ 90:5 ~ 10:5 ~ 10, negative active core-shell material is that specific area is 200 ~ 1500m
2the Graphene of/g or Graphene derivative, the mass ratio of negative active core-shell material and positive electrode active materials is 1:3 ~ 15.
The positive electrode active materials that conventional anode active material of lithium ion battery mainly adopts LiFePO4, cobalt acid lithium, LiMn2O4 etc. to contain the lithium source, the positive electrode active materials in the present invention adopts low specific surface area (1 ~ 20m
2/ g) graphite, its energy storage mechanism is embedding and the embedding out energy storage of anion in graphite flake layer utilized in electrolyte, can effectively improve the ability that electrode stores electric charge, finally improves the capacity of lithium ion battery.Negative active core-shell material of the present invention adopts high-specific surface area (200 ~ 1500m
2/ g) Graphene or Graphene derivative, its energy storage mechanism is embedding and the embedding out energy storage of lithium ion in negative active core-shell material utilized in electrolyte.
Preferably, the Graphene derivative is nitrogen-doped graphene or boron doped graphene.
Preferably, binding agent is Kynoar, polytetrafluoroethylene or polyvinyl alcohol.
Preferably, conductive agent is acetylene black, Ketjen black, carbon nano-tube or conductive carbon fibre.
Preferably, barrier film is polyethylene barrier film, polypropylene diaphragm or nonwoven fabrics barrier film.
Preferably, the solute of electrolyte is lithium hexafluoro phosphate or LiBF4.
Preferably, the solvent of electrolyte is one or more mixing in dimethyl carbonate, diethyl carbonate, propene carbonate, ethylene carbonate and acetonitrile.
Electrolyte is lithium salt electrolyte, and cation is lithium ion, and anion is PF
6 -or BF
4 -.In electrolyte, anion is adapted at embedding with embedding and going out to carry out energy storage in the graphite flake layer structure under high voltage, and the lithium ion in electrolyte embeds with embedding to go out to carry out energy storage in negative material, thereby improves the capacity of whole lithium ion battery.
The both positive and negative polarity of conventional lithium ion battery is all that lithium ion embeds embedding and goes out in positive and negative two electrodes, and during charging, lithium ion embedding in positive pole goes out, and through electrolyte, arrives negative pole, then embeds negative pole, and during electric discharge, lithium ion moves in the other direction, and this process does not consume electrolyte.Lithium ion battery provided by the invention lithium ion in electrolyte when charging embeds negative pole, anion is embedded in positive pole, during electric discharge, lithium ion embedding in negative pole goes out in electrolyte, anion embedding in positive pole goes out, can consume electrolyte in whole process, because consume electrolyte, lithium-ion electrolyte concentration of the present invention is than conventional lithium-ion electrolyte concentration (1.0mol/L) height.
Preferably, the concentration of electrolyte is 2.0 ~ 3.0mol/L.
In addition, the present invention also provides a kind of preparation method of lithium ion battery, comprises the following steps:
Step (1) prepares positive plate and negative plate:
The ratio that is 85 ~ 90:5 ~ 10:5 ~ 10 in mass ratio by positive electrode active materials, binding agent and conductive agent mixes, and obtains mixed slurry, and described mixed slurry is coated on aluminium foil, drying, rolls film, trimming and processes, and makes based lithium-ion battery positive plate; Wherein, positive electrode active materials is that specific area is 1 ~ 20m
2the graphite of/g;
The ratio that is 85 ~ 90:5 ~ 10:5 ~ 10 in mass ratio by negative active core-shell material, binding agent and conductive agent mixes, and obtains mixed slurry, and described mixed slurry is coated on aluminium foil, drying, rolls film, trimming and processes, and makes anode plate for lithium ionic cell; Wherein, negative active core-shell material is that specific area is 200 ~ 3000m
2the material with carbon element of/g, the mass ratio of negative active core-shell material and positive electrode active materials is 1:3 ~ 15;
Step (2) assembling ultracapacitor:
Dress up battery core according to positive plate, barrier film and negative plate order stack of laminations, by battery housing seal battery core, then inject electrolyte by the liquid injection port be arranged on battery container in battery container, the sealing liquid injection port, obtain lithium ion battery.
Positive electrode active materials in the present invention adopts low specific surface area (1 ~ 20m
2/ g) graphite, its energy storage mechanism is embedding and the embedding out energy storage of anion in graphite flake layer utilized in electrolyte, can effectively improve the ability that electrode stores electric charge, finally improves the capacity of lithium ion battery.Negative active core-shell material of the present invention adopts high-specific surface area (200 ~ 1500m
2/ g) Graphene or Graphene derivative, its energy storage mechanism is embedding and the embedding out energy storage of lithium ion in negative active core-shell material utilized in electrolyte.
Preferably, binding agent is Kynoar, polytetrafluoroethylene or polyvinyl alcohol.
Preferably, conductive agent is acetylene black, Ketjen black, carbon nano-tube or conductive carbon fibre.
Preferably, the Graphene derivative is nitrogen-doped graphene or boron doped graphene.
Preferably, barrier film is polyethylene barrier film, polypropylene diaphragm or nonwoven fabrics barrier film.
Preferably, the solute of electrolyte is lithium hexafluoro phosphate or LiBF4.
Preferably, the solvent of electrolyte is one or more mixing in dimethyl carbonate, diethyl carbonate, propene carbonate, ethylene carbonate and acetonitrile.
Electrolyte is lithium salt electrolyte, and cation is lithium ion, and anion is PF
6 -or BF
4 -.In electrolyte, anion is adapted at embedding with embedding and going out to carry out energy storage in the graphite flake layer structure under high voltage, and the lithium ion in electrolyte embeds with embedding to go out to carry out energy storage in negative active core-shell material, thereby improves the capacity of whole lithium ion battery.
The both positive and negative polarity of conventional lithium ion battery is all that lithium ion embeds embedding and goes out in positive and negative two electrodes, and during charging, lithium ion embedding in positive pole goes out, and through electrolyte, arrives negative pole, then embeds negative pole, and during electric discharge, lithium ion moves in the other direction, and this process does not consume electrolyte.Lithium ion battery provided by the invention lithium ion in electrolyte when charging embeds negative pole, anion is embedded in positive pole, during electric discharge, lithium ion embedding in negative pole goes out in electrolyte, anion embedding in positive pole goes out, can consume electrolyte in whole process, because consume electrolyte, so lithium-ion electrolyte concentration of the present invention is than conventional lithium-ion electrolyte concentration (1.0mol/L) height.
Preferably, the concentration of electrolyte is 2.0 ~ 3.0mol/L.
The invention provides a kind of lithium ion battery and preparation method thereof, there is following beneficial effect:
(1) lithium ion battery provided by the invention, the employing specific area is 1 ~ 20m
2the graphite of/g is as positive electrode active materials, and the employing specific area is 200 ~ 1500m
2the Graphene of/g or Graphene derivative are as negative active core-shell material, and its energy storage mechanism is that the moon/lithium ion embeds the mechanism that embedding goes out, and have improved electrode and have stored the ability of electric charge, thereby improved the capacity of lithium ion battery;
(2) lithium ion battery provided by the invention, anodal and negative pole all adopts material with carbon element and does not adopt metal oxide as active material, and environmentally safe does not need recycling after battery failure;
(3) preparation method of lithium ion battery provided by the invention, simple to operate, is easy to accomplish scale production.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the cycle life test curve of the lithium ion battery of the embodiment of the present invention 1 preparation.
Embodiment
The following stated is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also are considered as protection scope of the present invention.
First aspect, the invention provides a kind of lithium ion battery, comprise positive pole, negative pole, the barrier film between positive pole and negative pole and electrolyte, positive pole comprises aluminium foil and is coated in the positive electrode on aluminium foil, negative pole comprises aluminium foil and is coated in the negative material on aluminium foil, positive electrode comprises positive electrode active materials, binding agent and the conductive agent that mass ratio is 85 ~ 90:5 ~ 10:5 ~ 10, and positive electrode active materials is that specific area is 1 ~ 20m
2the graphite of/g, negative material comprises negative active core-shell material, binding agent and the conductive agent that mass ratio is 85 ~ 90:5 ~ 10:5 ~ 10, negative active core-shell material is that specific area is 200 ~ 1500m
2the Graphene of/g or Graphene derivative, the mass ratio of negative active core-shell material and positive electrode active materials is 1:3 ~ 15.
The positive electrode active materials that conventional anode active material of lithium ion battery mainly adopts LiFePO4, cobalt acid lithium, LiMn2O4 etc. to contain the lithium source, the positive electrode active materials in the present invention adopts low specific surface area (1 ~ 20m
2/ g) graphite, its energy storage mechanism is embedding and the embedding out energy storage of anion in graphite flake layer utilized in electrolyte, can effectively improve the ability that electrode stores electric charge, finally improves the capacity of lithium ion battery.Negative active core-shell material of the present invention adopts high-specific surface area (200 ~ 1500m
2/ g) Graphene or Graphene derivative, its energy storage mechanism is embedding and the embedding out energy storage of lithium ion in negative active core-shell material utilized in electrolyte.
Preferably, the Graphene derivative is nitrogen-doped graphene or boron doped graphene.
Preferably, binding agent is Kynoar, polytetrafluoroethylene or polyvinyl alcohol.
Preferably, conductive agent is acetylene black, Ketjen black, carbon nano-tube or conductive carbon fibre.
Preferably, barrier film is polyethylene barrier film, polypropylene diaphragm or nonwoven fabrics barrier film.
Preferably, the solute of electrolyte is lithium hexafluoro phosphate or LiBF4.
Preferably, the solvent of electrolyte is one or more mixing in dimethyl carbonate, diethyl carbonate, propene carbonate, ethylene carbonate and acetonitrile.
Electrolyte is lithium salt electrolyte, and cation is lithium ion, and anion is PF
6 -or BF
4 -.In electrolyte, anion is adapted at embedding with embedding and going out to carry out energy storage in the graphite flake layer structure under high voltage, and the lithium ion in electrolyte embeds with embedding to go out to carry out energy storage in negative material, thereby improves the capacity of whole lithium ion battery.
The both positive and negative polarity of conventional lithium ion battery is all that lithium ion embeds embedding and goes out in positive and negative two electrodes, and during charging, lithium ion embedding in positive pole goes out, and through electrolyte, arrives negative pole, then embeds negative pole, and during electric discharge, lithium ion moves in the other direction, and this process does not consume electrolyte.Lithium ion battery provided by the invention lithium ion in electrolyte when charging embeds negative pole, anion is embedded in positive pole, during electric discharge, lithium ion embedding in negative pole goes out in electrolyte, anion embedding in positive pole goes out, can consume electrolyte in whole process, because consume electrolyte, lithium-ion electrolyte concentration of the present invention is than conventional lithium-ion electrolyte concentration (1.0mol/L) height.
Preferably, the concentration of electrolyte is 2.0 ~ 3.0mol/L.
In addition, the present invention also provides a kind of preparation method of lithium ion battery, comprises the following steps:
Step (1) prepares positive plate and negative plate:
The ratio that is 85 ~ 90:5 ~ 10:5 ~ 10 in mass ratio by positive electrode active materials, binding agent and conductive agent mixes, and obtains mixed slurry, and described mixed slurry is coated on aluminium foil, drying, rolls film, trimming and processes, and makes based lithium-ion battery positive plate; Wherein, positive electrode active materials is that specific area is 1 ~ 20m
2the graphite of/g;
The ratio that is 85 ~ 90:5 ~ 10:5 ~ 10 in mass ratio by negative active core-shell material, binding agent and conductive agent mixes, and obtains mixed slurry, and described mixed slurry is coated on aluminium foil, drying, rolls film, trimming and processes, and makes anode plate for lithium ionic cell; Wherein, negative active core-shell material is that specific area is 200 ~ 3000m
2the material with carbon element of/g, the mass ratio of negative active core-shell material and positive electrode active materials is 1:3 ~ 15;
Step (2) assembling ultracapacitor:
Dress up battery core according to positive plate, barrier film and negative plate order stack of laminations, by battery housing seal battery core, then inject electrolyte by the liquid injection port be arranged on battery container in battery container, the sealing liquid injection port, obtain lithium ion battery.
Positive electrode active materials in the present invention adopts low specific surface area (1 ~ 20m
2/ g) graphite, its energy storage mechanism is embedding and the embedding out energy storage of anion in graphite flake layer utilized in electrolyte, can effectively improve the ability that electrode stores electric charge, finally improves the capacity of lithium ion battery.Negative active core-shell material of the present invention adopts high-specific surface area (200 ~ 1500m
2/ g) Graphene or Graphene derivative, its energy storage mechanism is embedding and the embedding out energy storage of lithium ion in negative active core-shell material utilized in electrolyte.
Preferably, binding agent is Kynoar, polytetrafluoroethylene or polyvinyl alcohol.
Preferably, conductive agent is acetylene black, Ketjen black, carbon nano-tube or conductive carbon fibre.
Preferably, the Graphene derivative is nitrogen-doped graphene or boron doped graphene.
Preferably, barrier film is polyethylene barrier film, polypropylene diaphragm or nonwoven fabrics barrier film.
Preferably, the solute of electrolyte is lithium hexafluoro phosphate or LiBF4.
Preferably, the solvent of electrolyte is one or more mixing in dimethyl carbonate, diethyl carbonate, propene carbonate, ethylene carbonate and acetonitrile.
Electrolyte is lithium salt electrolyte, and cation is lithium ion, and anion is PF
6 -or BF
4 -.In electrolyte, anion is adapted at embedding with embedding and going out to carry out energy storage in the graphite flake layer structure under high voltage, and the lithium ion in electrolyte embeds with embedding to go out to carry out energy storage in negative active core-shell material, thereby improves the capacity of whole lithium ion battery.
The both positive and negative polarity of conventional lithium ion battery is all that lithium ion embeds embedding and goes out in positive and negative two electrodes, and during charging, lithium ion embedding in positive pole goes out, and through electrolyte, arrives negative pole, then embeds negative pole, and during electric discharge, lithium ion moves in the other direction, and this process does not consume electrolyte.Lithium ion battery provided by the invention lithium ion in electrolyte when charging embeds negative pole, anion is embedded in positive pole, during electric discharge, lithium ion embedding in negative pole goes out in electrolyte, anion embedding in positive pole goes out, can consume electrolyte in whole process, because consume electrolyte, so lithium-ion electrolyte concentration of the present invention is than conventional lithium-ion electrolyte concentration (1.0mol/L) height.
Preferably, the concentration of electrolyte is 2.0 ~ 3.0mol/L.
The invention provides a kind of lithium ion battery and preparation method thereof, there is following beneficial effect:
(1) lithium ion battery provided by the invention, the employing specific area is 1 ~ 20m
2the graphite of/g is as positive electrode active materials, and the employing specific area is 200 ~ 1500m
2the Graphene of/g or Graphene derivative are as negative active core-shell material, and its energy storage mechanism is that the moon/lithium ion embeds the mechanism that embedding goes out, and have improved electrode and have stored the ability of electric charge, thereby improved the capacity of lithium ion battery;
(2) lithium ion battery provided by the invention, anodal and negative pole all adopts material with carbon element and does not adopt metal oxide as active material, and environmentally safe does not need recycling after battery failure;
(3) preparation method of lithium ion battery provided by the invention, simple to operate, is easy to accomplish scale production.
Embodiment mono-
A kind of preparation method of lithium ion battery comprises the following steps:
(1) by the 25.5g specific area, be 1m
2the graphite of/g, 1.5g Kynoar binding agent and 3g acetylene black conductor mix, and obtain mixed slurry, and mixed slurry is coated on aluminium foil, drying, roll film, trimming and process, and make based lithium-ion battery positive plate;
(2) by the 8.5g specific area, be 1500m
2the Graphene of/g, 0.5g Kynoar binding agent and 1g acetylene black conductor mix, and obtain mixed slurry, and mixed slurry is coated on aluminium foil, drying, roll film, trimming and process, and make anode plate for lithium ionic cell;
In the present embodiment, the mass ratio of negative active core-shell material and positive electrode active materials is 1:3;
(3) get polypropylene diaphragm, dress up battery core with positive plate and negative plate stack of laminations, by battery housing seal battery core, again by being arranged on liquid injection port on battery container toward the lithium salt electrolyte lithium hexafluoro phosphate/dimethyl carbonate that injects 2.0mol/L in battery container, the sealing liquid injection port, obtain lithium ion battery.
The lithium ion battery of above-mentioned preparation is carried out under the current density of 0.1C to the charge discharge test, the energy density that records the present embodiment lithium ion battery is 143whkg.With existing commercial batteries, compare, the existing general 100 ~ 150wh/g of commercial li-ion energy content of battery density, commercial Ni-MH battery energy density 60 ~ 80wh/kg, therefore, the energy density of the present embodiment lithium ion battery surpasses existing Ni-MH battery, with existing lithium ion battery level, maintains an equal level.
Lithium ion battery prepared by the present embodiment carries out the cycle life test, and test result as shown in Figure 1.As can be seen from Figure 1, after 100 circulations, the energy density of lithium ion battery can also keep more than 90%.
Embodiment bis-
A kind of preparation method of lithium ion battery comprises the following steps:
(1) by the 127.5g specific area, be 20m
2the graphite of/g, 15g polytetrafluoroethylene binding agent and 7.5g Ketjen black conductive agent mix, and obtain mixed slurry, and mixed slurry is coated on aluminium foil, drying, roll film, trimming and process, and make based lithium-ion battery positive plate;
(2) by the 8.5g specific area, be 1500m
2the nitrogen-doped graphene of/g, 1g polytetrafluoroethylene binding agent and 0.5g Ketjen black conductive agent mix, and obtain mixed slurry, and mixed slurry is coated on aluminium foil, drying, roll film, trimming and process, and make anode plate for lithium ionic cell;
In the present embodiment, the mass ratio of negative active core-shell material and positive electrode active materials is 1: 15;
(3) get the polyethylene barrier film, dress up battery core with positive plate and negative plate stack of laminations, by battery housing seal battery core, again by being arranged on liquid injection port on battery container toward the lithium salt electrolyte lithium hexafluoro phosphate/diethyl carbonate that injects 3.0mol/L in battery container, the sealing liquid injection port, obtain lithium ion battery.
The lithium ion battery of above-mentioned preparation is carried out under the current density of 0.1C to the charge discharge test, the energy density that records the present embodiment lithium ion battery is 135wh/kg.
Embodiment tri-
A kind of preparation method of lithium ion battery comprises the following steps:
(1) by the 45g specific area, be 10m
2the graphite of/g, 2.5g polyvinyl alcohol adhesive and the agent of 2.5g carbon nanotube conducting mix, and obtain mixed slurry, and mixed slurry is coated on aluminium foil, drying, roll film, trimming and process, and make based lithium-ion battery positive plate;
(2) by the 9g specific area, be 500m
2the boron doped graphene of/g, 0.5g polyvinyl alcohol adhesive and the agent of 0.5g carbon nanotube conducting mix, and obtain mixed slurry, and mixed slurry is coated on aluminium foil, drying, roll film, trimming and process, and make anode plate for lithium ionic cell;
In the present embodiment, the mass ratio of negative active core-shell material and positive electrode active materials is 1:5;
(3) get polypropylene diaphragm, dress up battery core with positive plate and negative plate stack of laminations, by battery housing seal battery core, again by being arranged on liquid injection port on battery container toward the lithium salt electrolyte LiBF4/propene carbonate that injects 2.5mol/L in battery container, the sealing liquid injection port, obtain lithium ion battery.
The lithium ion battery of above-mentioned preparation is carried out under the current density of 0.1C to the charge discharge test, the energy density that records the present embodiment lithium ion battery is 137whg.
Embodiment tetra-
A kind of preparation method of lithium ion battery comprises the following steps:
(1) by the 87g specific area, be 15m
2the graphite of/g, 6g Kynoar binding agent and 7g conductive carbon fibre mix, and obtain mixed slurry, and mixed slurry is coated on aluminium foil, drying, roll film, trimming and process, and make based lithium-ion battery positive plate;
(2) by the 8.7g specific area, be 800m
2the boron doped graphene of/g, 0.6g Kynoar binding agent and 0.7g conductive carbon fibre mix, and obtain mixed slurry, and mixed slurry is coated on aluminium foil, drying, roll film, trimming and process, and make anode plate for lithium ionic cell;
In the present embodiment, the mass ratio of negative active core-shell material and positive electrode active materials is 1: 10;
(3) get the nonwoven fabrics barrier film, dress up battery core with positive plate and negative plate stack of laminations, by battery housing seal battery core, again by being arranged on liquid injection port on battery container toward the lithium salts electrolysis lithium hexafluoro phosphate/ethylene carbonate that injects 2.8mol/L in battery container, the sealing liquid injection port, obtain lithium ion battery.
The lithium ion battery of above-mentioned preparation is carried out under the current density of 0.1C to the charge discharge test, the energy density that records the present embodiment lithium ion battery is 131whkg.
Embodiment five
A kind of preparation method of lithium ion battery comprises the following steps:
(1) by the 68.8g specific area, be 5m
2the graphite of/g, 5.6g Kynoar binding agent and 5.6g acetylene black conductor mix, and obtain mixed slurry, and mixed slurry is coated on aluminium foil, drying, roll film, trimming and process, and make based lithium-ion battery positive plate;
(2) by the 8.6g specific area, be 300m
2the boron doped graphene of/g, 0.7g Kynoar binding agent and 0.7g acetylene black conductor mix, and obtain mixed slurry, and mixed slurry is coated on aluminium foil, drying, roll film, trimming and process, and make anode plate for lithium ionic cell;
In the present embodiment, the mass ratio of negative active core-shell material and positive electrode active materials is 1:8;
(3) get the polyethylene barrier film, dress up battery core with positive plate and negative plate stack of laminations, by battery housing seal battery core, then by being arranged on liquid injection port on the battery container lithium salt electrolyte LiBF4/acetonitrile toward injection 2.6mol/L in battery container, the sealing liquid injection port, obtain lithium ion battery.
The lithium ion battery of above-mentioned preparation is carried out under the current density of 0.1C to the charge discharge test, the energy density that records the present embodiment lithium ion battery is 140wh/kg.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also are considered as protection scope of the present invention.
Claims (10)
1. a lithium ion battery, described lithium ion battery comprises positive pole, negative pole, barrier film and electrolyte between described positive pole and described negative pole, described positive pole comprises aluminium foil and is coated in the positive electrode on described aluminium foil, described negative pole comprises aluminium foil and is coated in the negative material on described aluminium foil, it is characterized in that, described positive electrode comprises positive electrode active materials, binding agent and the conductive agent that mass ratio is 85 ~ 90:5 ~ 10:5 ~ 10, and described positive electrode active materials is that specific area is 1 ~ 20m
2the graphite of/g, described negative material comprises negative active core-shell material, binding agent and the conductive agent that mass ratio is 85 ~ 90:5 ~ 10:5 ~ 10, described negative active core-shell material is that specific area is 200 ~ 1500m
2the Graphene of/g or Graphene derivative, the mass ratio of described negative active core-shell material and described positive electrode active materials is 1:3 ~ 15.
2. lithium ion battery as claimed in claim 1, is characterized in that, described Graphene derivative is nitrogen-doped graphene or boron doped graphene.
3. lithium ion battery as claimed in claim 1, it is characterized in that, the solute of described electrolyte is lithium hexafluoro phosphate or LiBF4, and the solvent of described electrolyte is one or more mixing in dimethyl carbonate, diethyl carbonate, propene carbonate, ethylene carbonate and acetonitrile.
4. lithium ion battery as claimed in claim 1, is characterized in that, the concentration of described electrolyte is 2.0 ~ 3.0mol/L.
5. lithium ion battery as claimed in claim 1, it is characterized in that, described binding agent is Kynoar, polytetrafluoroethylene or polyvinyl alcohol, described conductive agent is acetylene black, Ketjen black, carbon nano-tube or conductive carbon fibre, and described barrier film is polyethylene barrier film, polypropylene diaphragm or nonwoven fabrics barrier film.
6. the preparation method of a lithium ion battery, is characterized in that, comprises the following steps:
Step (1) prepares positive plate and negative plate:
The ratio that is 85 ~ 90:5 ~ 10:5 ~ 10 in mass ratio by positive electrode active materials, binding agent and conductive agent mixes, and obtains mixed slurry, and described mixed slurry is coated on aluminium foil, drying, rolls film, trimming and processes, and makes based lithium-ion battery positive plate; Wherein, described positive electrode active materials is that specific area is 1 ~ 20m
2the graphite of/g;
The ratio that is 85 ~ 90:5 ~ 10:5 ~ 10 in mass ratio by negative active core-shell material, binding agent and conductive agent mixes, and obtains mixed slurry, and described mixed slurry is coated on aluminium foil, drying, rolls film, trimming and processes, and makes anode plate for lithium ionic cell; Wherein, described negative active core-shell material is that specific area is 200 ~ 1500m
2the Graphene of/g or Graphene derivative, the mass ratio of described negative active core-shell material and described positive electrode active materials is 1:3 ~ 15;
Step (2) assembling ultracapacitor:
Dress up battery core according to positive plate, barrier film and negative plate order stack of laminations, by the described battery core of battery housing seal, then inject electrolyte by the liquid injection port be arranged on described battery container in described battery container, seal described liquid injection port, obtain lithium ion battery.
7. the preparation method of lithium ion battery as claimed in claim 6, is characterized in that, described Graphene derivative is nitrogen-doped graphene or boron doped graphene.
8. the preparation method of lithium ion battery as claimed in claim 6, it is characterized in that, described binding agent is Kynoar, polytetrafluoroethylene or polyvinyl alcohol, described conductive agent is acetylene black, Ketjen black, carbon nano-tube or conductive carbon fibre, and described barrier film is polyethylene barrier film, polypropylene diaphragm or nonwoven fabrics barrier film.
9. the preparation method of lithium ion battery as claimed in claim 6, it is characterized in that, the solute of described electrolyte is lithium hexafluoro phosphate or LiBF4, and the solvent of described electrolyte is one or more mixing in dimethyl carbonate, diethyl carbonate, propene carbonate, ethylene carbonate and acetonitrile.
10. the preparation method of lithium ion battery as claimed in claim 6, is characterized in that, the concentration of described electrolyte is 2.0 ~ 3.0mol/L.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104810548A (en) * | 2014-07-15 | 2015-07-29 | 万向A一二三系统有限公司 | High-performance lithium titanate power battery |
| CN106654270A (en) * | 2015-10-30 | 2017-05-10 | 宝山钢铁股份有限公司 | A cathode prepared from a hard carbon material, an energy storage apparatus comprising the cathode, uses of the hard carbon and a preparing method of the cathode |
| CN107108225A (en) * | 2014-10-10 | 2017-08-29 | 东丽株式会社 | Graphene powder, lithium ion battery are with electrode paste and lithium ion battery electrode |
| CN109560339A (en) * | 2018-11-27 | 2019-04-02 | 中国科学院青岛生物能源与过程研究所 | A kind of pre- embedding anion method and full battery |
| CN109961967A (en) * | 2017-12-26 | 2019-07-02 | 广州汽车集团股份有限公司 | Lithium-ion capacitor and preparation method thereof |
| CN110556537A (en) * | 2019-08-28 | 2019-12-10 | 华中科技大学 | Method for improving electrochemical performance of anion-embedded electrode material |
| CN114497441A (en) * | 2022-01-07 | 2022-05-13 | 珠海冠宇电池股份有限公司 | Negative plate and battery comprising same |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104810548A (en) * | 2014-07-15 | 2015-07-29 | 万向A一二三系统有限公司 | High-performance lithium titanate power battery |
| CN107108225A (en) * | 2014-10-10 | 2017-08-29 | 东丽株式会社 | Graphene powder, lithium ion battery are with electrode paste and lithium ion battery electrode |
| CN106654270A (en) * | 2015-10-30 | 2017-05-10 | 宝山钢铁股份有限公司 | A cathode prepared from a hard carbon material, an energy storage apparatus comprising the cathode, uses of the hard carbon and a preparing method of the cathode |
| CN109961967A (en) * | 2017-12-26 | 2019-07-02 | 广州汽车集团股份有限公司 | Lithium-ion capacitor and preparation method thereof |
| CN109961967B (en) * | 2017-12-26 | 2021-09-21 | 广州巨湾技研有限公司 | Lithium ion capacitor and preparation method thereof |
| CN109560339A (en) * | 2018-11-27 | 2019-04-02 | 中国科学院青岛生物能源与过程研究所 | A kind of pre- embedding anion method and full battery |
| CN110556537A (en) * | 2019-08-28 | 2019-12-10 | 华中科技大学 | Method for improving electrochemical performance of anion-embedded electrode material |
| CN114497441A (en) * | 2022-01-07 | 2022-05-13 | 珠海冠宇电池股份有限公司 | Negative plate and battery comprising same |
| CN114497441B (en) * | 2022-01-07 | 2024-04-26 | 珠海冠宇电池股份有限公司 | Negative plate and battery comprising same |
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