CN106450333A - Lithium battery anode slurry and slurry mixing method thereof - Google Patents
Lithium battery anode slurry and slurry mixing method thereof Download PDFInfo
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- CN106450333A CN106450333A CN201610972488.3A CN201610972488A CN106450333A CN 106450333 A CN106450333 A CN 106450333A CN 201610972488 A CN201610972488 A CN 201610972488A CN 106450333 A CN106450333 A CN 106450333A
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- lithium battery
- battery anode
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
-
- 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
- H01M4/621—Binders
-
- 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
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
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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 provides lithium battery anode slurry and a slurry mixing method thereof, and relates to the field of batteries. The lithium battery anode slurry is prepared from an anode material, graphene, an adhesive and a dispersant. According to the lithium battery anode slurry, the graphene is matched with the adhesive and other auxiliaries, and types and contents of the graphene, adhesive and other raw materials are adjusted by a great number of experiments, so that the contents of active substances in the finally prepared lithium battery anode slurry are greatly increased. The slurry mixing method of the lithium battery anode slurry can be used for reducing the dosage of a slurry mixing solvent, and thus the production cost can be reduced.
Description
Technical field
The present invention relates to cell art, it is related to a kind of lithium battery anode slurry and its closes paste-making method.
Background technology
Lithium ion battery has that open-circuit voltage is high, energy density is high, self-discharge rate is low, memory-less effect, environmentally friendly,
Cycle-index is many, can fast charging and discharging the advantages of.As the important electrochmical power source of a class, lithium ion battery has progressively moved towards electronic vapour
Car dynamic field.
In lithium ion battery electrokinetic cell field, welcome the growth of explosion type in new-energy automobile in 2015, demand
While increase has driven the rapid growth of new-energy automobile, also drive the demand to high-performance power battery.Lithium battery is made
For the main flow of Chinese electrokinetic cell, the high performance pursuit for high-energy, it is the inevitable direction of technology development.
At present, improve the energy density of battery, have two methods：One is to cut down not having contributive portion material to generation electric power,
The collector of such as thinning both positive and negative polarity and barrier film, minimizing binding agent and conductive aid etc., are to be improved by battery design.
But this way has the limit to be limited；Two is by increasing electrode active material（Both positive and negative polarity）Unit Weight or unit volume
Capacity, by increase slurry in active substance amount, to improve active substance quality in unit area such that it is able to improve material
Material high rate charge-discharge performance and energy density, but dry linting etc. can be brought while improving the quality of active substance to affect,
Therefore, on the premise of not affecting battery performance, the ratio improving active substance in cell size is even more important.
Content of the invention
Not enough for prior art, the present invention provides a kind of lithium battery anode slurry and its closes paste-making method, solves existing
The low technical problem of the ratio of active substance in technology cell size.
For realizing object above, the present invention is achieved by the following technical programs：
A kind of lithium battery anode slurry, its raw material includes positive electrode, binding agent and dispersant, and described lithium battery anode slurry is also
Including Graphene, described positive electrode, binding agent, Graphene, the percentage by weight of dispersant be respectively positive electrode 93-97%,
Binding agent 2-5%, Graphene 1-2%, dispersant 0.3-0.8%.
Preferably, described positive electrode is one of LiFePO4, cobalt acid lithium or LiMn2O4.
Preferably, described binding agent is at least one in HSV900, Wu Yu PVDF9100, Wu Yu PVDF4300.
Preferably, described dispersant is one of Polyvinylpyrrolidone, Kynoar or two kinds, described poly- second
The mass ratio of alkene pyrrolidone and Kynoar is 1:1.
A kind of conjunction paste-making method of use lithium battery anode slurry, comprises the following steps：
S1, weigh positive electrode, Graphene, binding agent, dispersant；
S2, binding agent is placed in conjunction slurry cylinder, adds and close slurry solvent, stir 1 ~ 2h under vacuum conditions, and vacuum environment is true
Reciprocal of duty cycle is -0.08 ~ -0.1Mpa, obtains slurry；
S3, dispersant is mixed homogeneously with Graphene after add step S1 be obtained slurry in, under vacuum environment stir 1 ~ 3 h,
Keep the vacuum constant, continuously add positive electrode, stir 4 ~ 8 h, you can.
Preferably, closing slurry solvent described in step S2 is N-Methyl pyrrolidone.
Preferably, the quality closing slurry solvent described in step S2 is the 15% ~ 30% of described positive electrode quality.
Preferably, the viscosity of slurry described in step S2 is 6000 ~ 15000 mPa s
The present invention provides a kind of lithium battery anode slurry and its closes paste-making method, and compared with prior art advantage is：
Lithium battery anode slurry of the present invention adopts Graphene as conductive agent, can significantly improve the electric conductivity of battery core, adopt this
Plant conductive agent it can be avoided that battery core is firmly swollen；The adhesive agent using has preferable caking property, and peel strength is high；The present invention adopts stone
Black alkene cooperation binding agent and other auxiliary agents, are adjusted species and the content of the raw materials such as Graphene, binding agent, make by many experiments
The amount obtaining active substance in the lithium battery anode slurry being finally obtained greatly improves, and reaches 93%-97%, does not have dry linting existing after coating
As, and the charge-discharge performance of single battery core and energy density also greatly improve；
The conjunction paste-making method of lithium battery anode slurry of the present invention can reduce the consumption closing slurry solvent, thus reducing production cost.
Brief description
Fig. 1 is the charging and discharging curve figure of corresponding square 20100140 battery cores of the embodiment of the present invention 1；
Fig. 2 is the charging and discharging curve figure of corresponding square 20100140 battery cores of the embodiment of the present invention 2.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, with reference to the embodiment of the present invention pair
Technical scheme in the embodiment of the present invention is clearly and completely described it is clear that described embodiment is a present invention part
Embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making wound
The every other embodiment being obtained under the premise of the property made work, broadly falls into the scope of protection of the invention.
Embodiment 1：
The present embodiment lithium battery anode slurry is made up of the raw material of following percentage by weight：LiFePO4 95%, Graphene 2%, viscous
Knot agent 2.5%, dispersant 0.5%；
Wherein binding agent is Wu Yu PVDF 9100 and Wu Yu PVDF4300 in mass ratio 3:1 mixing；Dispersant is polyvinyl pyrrole
Alkanone and Kynoar are 1 in mass ratio:1 mixing；Conjunction slurry solvent is N-Methyl pyrrolidone；
The present embodiment uses the conjunction paste-making method of lithium battery anode slurry, comprises the following steps：
S1, weigh LiFePO4, Graphene, Wu Yu PVDF 9100, Wu Yu PVDF4300, Polyvinylpyrrolidone, polyvinylidene fluoride
Alkene；
S2, will Wu Yu PVDF 9100 and Wu Yu PVDF4300 mixing after be placed in conjunction slurry cylinder in, add close slurry solvent, in vacuum ring
Stir 1h under border, and the vacuum of vacuum environment is -0.1Mpa, obtains slurry；
S3, first Polyvinylpyrrolidone and Kynoar are mixed, then add step S1 system after mixing homogeneously with Graphene
In the slurry obtaining, stir 3 h under vacuum environment, keep the vacuum constant, continuously add LiFePO4, stir 6h, low speed is homogenized,
Slurry viscosity is maintained at 6000 ~ 15000 mPaS, you can.
Slurry manufactured in the present embodiment is coated on the utter misery aluminium foil that thickness is 15 μm, the surface density of coating is 360
g/m2, coating thickness be 250 μm.
LiFePO4, after cladding, on square 20100140 battery core platforms, prepares battery core, and battery core negative pole is stone
Ink.
Fig. 1 is the charging and discharging curve figure of corresponding square 20100140 battery cores of the present embodiment.As seen from Figure 1,
Under 0.33C, 0.5C, 1C, 1.5C multiplying power, charge/discharge capacity all can reach 25Ah.
Embodiment 2：
The present embodiment lithium battery anode slurry is made up of the raw material of following percentage by weight：LiFePO4 96%, Graphene 1.5%,
Binding agent 2%, dispersant 0.5%；
Wherein binding agent is Wu Yu PVDF 9100；Dispersant is Polyvinylpyrrolidone；Conjunction slurry solvent is N- crassitude
Ketone；
The present embodiment uses the conjunction paste-making method of lithium battery anode slurry, comprises the following steps：
S1, weigh LiFePO4, Graphene, Wu Yu PVDF 9100, Polyvinylpyrrolidone,；
S2, Wu Yu PVDF 9100 is placed in conjunction slurry cylinder, adds and close slurry solvent, stir 1h, and vacuum environment under vacuum conditions
Vacuum be -0.1Mpa, obtain slurry；
S3, Polyvinylpyrrolidone is mixed homogeneously with Graphene after add step S1 be obtained slurry in, stir under vacuum environment
To mix 3 h, keep the vacuum constant, continuously add LiFePO4, stir 6h, low speed is homogenized, slurry viscosity is maintained at 6000 ~
15000 mPaS, you can.
Slurry manufactured in the present embodiment is coated on the utter misery aluminium foil that thickness is 15 μm, the surface density of coating is 360
g/m2, coating thickness be 300 μm.
LiFePO4, after cladding, on square 20100140 battery core platforms, prepares battery core, and battery core negative pole is stone
Ink.
Fig. 2 is the charging and discharging curve figure of corresponding square 20100140 battery cores of the present embodiment.As seen from Figure 2,
Under 0.33C, 0.5C, 1C, 1.5C multiplying power, charge/discharge capacity all can reach 25Ah.
Embodiment 3：
The present embodiment lithium battery anode slurry is made up of the raw material of following percentage by weight：Cobalt acid lithium 93%, Graphene 2%, bonding
Agent 4.2%, dispersant 0.8%；
Wherein binding agent is HSV900；Dispersant is Kynoar；Conjunction slurry solvent is N-Methyl pyrrolidone；
The present embodiment uses the conjunction paste-making method of lithium battery anode slurry, comprises the following steps：
S1, weigh cobalt acid lithium, Graphene, HSV900, Kynoar；
S2, HSV900 is placed in conjunction slurry cylinder, adds and close slurry solvent, stir 2h, and the vacuum of vacuum environment under vacuum conditions
Spend for -0.08Mpa, obtain slurry；
S3, Kynoar is mixed homogeneously with Graphene after add step S1 be obtained slurry in, under vacuum environment stir 1h,
Keep the vacuum constant, continuously add cobalt acid lithium, stir 4h, low speed is homogenized, slurry viscosity is maintained at 6000 ~ 15000 mPaS,
?.
Embodiment 4：
The present embodiment lithium battery anode slurry is made up of the raw material of following percentage by weight：LiMn2O4 97%, Graphene 1%, bonding
Agent 2%；
Wherein binding agent is Wu Yu PVDF 9100 and Wu Yu PVDF4300 in mass ratio 3:1 mixing；Dispersant is polyvinyl pyrrole
Alkanone and Kynoar are 1 in mass ratio:1 mixing；Conjunction slurry solvent is N-Methyl pyrrolidone；
The present embodiment uses the conjunction paste-making method of lithium battery anode slurry, comprises the following steps：
S1, weigh LiMn2O4, Graphene, Wu Yu PVDF 9100, Wu Yu PVDF4300, Polyvinylpyrrolidone, polyvinylidene fluoride
Alkene；
S2, will Wu Yu PVDF 9100 and Wu Yu PVDF4300 mixing after be placed in conjunction slurry cylinder in, add close slurry solvent, in vacuum ring
Stir 2h under border, and the vacuum of vacuum environment is -0.1Mpa, obtains slurry；
S3, first Polyvinylpyrrolidone and Kynoar are mixed, then add step S1 system after mixing homogeneously with Graphene
In the slurry obtaining, stir 3h under vacuum environment, keep the vacuum constant, continuously add LiMn2O4, stir 8h, low speed is homogenized, slurry
Material viscosity is maintained at 6000 ~ 15000 mPaS, you can.
In sum, lithium battery anode slurry of the present invention adopts Graphene as conductive agent, can significantly improve battery core
Electric conductivity, using this kind of conductive agent it can be avoided that battery core is firmly swollen；The adhesive agent using has preferable caking property, peel strength
High；The present invention adopts Graphene cooperation binding agent and other auxiliary agents, adjusts the raw materials such as Graphene, binding agent by many experiments
Species and content so that in the lithium battery anode slurry that is finally obtained the amount of active substance greatly improve, reach 93%-97%,
There is no dry linting phenomenon after coating, and the charge-discharge performance of single battery core and energy density also greatly improve；
The conjunction paste-making method of lithium battery anode slurry of the present invention can reduce the consumption closing slurry solvent, thus reducing production cost.
Above example only in order to technical scheme to be described, is not intended to limit；Although with reference to the foregoing embodiments
The present invention has been described in detail, it will be understood by those within the art that：It still can be to aforementioned each enforcement
Technical scheme described in example is modified, or carries out equivalent to wherein some technical characteristics；And these modification or
Replace, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. a kind of lithium battery anode slurry, its raw material includes positive electrode, binding agent and dispersant it is characterised in that described lithium
Battery anode slurry also includes Graphene, and described positive electrode, binding agent, Graphene, the percentage by weight of dispersant are respectively
Positive electrode 93-97%, binding agent 2-5%, Graphene 1-2%, dispersant 0.3-0.8%.
2. lithium battery anode slurry according to claim 1 it is characterised in that：Described positive electrode is LiFePO4, cobalt
One of sour lithium or LiMn2O4.
3. lithium battery anode slurry according to claim 1 it is characterised in that：Described binding agent is HSV900, Wu Yu
At least one in PVDF9100, Wu Yu PVDF4300.
4. lithium battery anode slurry according to claim 1 it is characterised in that：Described dispersant is polyvinylpyrrolidine
One of ketone, Kynoar or two kinds, the mass ratio of described Polyvinylpyrrolidone and Kynoar is 1:1.
5. a kind of usage right requires the conjunction paste-making method of the arbitrary described lithium battery anode slurry of 1-4 it is characterised in that including following
Step：
S1, weigh positive electrode, Graphene, binding agent, dispersant；
S2, binding agent is placed in conjunction slurry cylinder, adds and close slurry solvent, stir 1 ~ 2h under vacuum conditions, and vacuum environment is true
Reciprocal of duty cycle is -0.08 ~ -0.1Mpa, obtains slurry；
S3, dispersant is mixed homogeneously with Graphene after add step S1 be obtained slurry in, under vacuum environment stir 1 ~ 3 h,
Keep the vacuum constant, continuously add positive electrode, stir 4 ~ 8 h, you can.
6. according to claim 5 conjunction paste-making method it is characterised in that：Closing slurry solvent described in step S2 is N- crassitude
Ketone.
7. the conjunction paste-making method according to claim 5 or 6 it is characterised in that：The quality closing slurry solvent described in step S2 is institute
State the 15% ~ 30% of positive electrode quality.
8. according to claim 5 conjunction paste-making method it is characterised in that：The viscosity of slurry described in step S2 is 6000 ~
15000 mPa·s.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023059A (en) * | 2017-11-30 | 2018-05-11 | 东莞市金源电池科技有限公司 | A kind of process for dispersing of lithium battery slurrying graphene |
| US10428246B2 (en) | 2017-12-19 | 2019-10-01 | Industrial Technology Research Institute | Adhesive composition |
| CN113054157A (en) * | 2021-03-15 | 2021-06-29 | 星恒电源股份有限公司 | Double-composite modified spinel lithium manganate positive plate, preparation method thereof and lithium ion battery |
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