CN108232120A - A kind of synthesis of solid state lithium battery and a kind of graphite composite negative plate and the preparation method of iron lithium phosphate compound anode piece - Google Patents
A kind of synthesis of solid state lithium battery and a kind of graphite composite negative plate and the preparation method of iron lithium phosphate compound anode piece Download PDFInfo
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- H01M10/00—Secondary cells; Manufacture thereof
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- 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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- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
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- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- 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
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- 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
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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Abstract
The invention discloses a kind of synthesis of solid state lithium battery, it is characterised in that：The solid lithium ion battery synthesis step：Step 1：By iron lithium phosphate compound anode piece and polyethylene oxide base lithium ion conductor solid electrolyte, graphite composite negative plate carries out lamination, assembling obtains solid lithium ion battery；Step 2：It will obtain solid lithium ion battery and charge and discharge cycles test is carried out under conditions of 60 DEG C, 0.3C charge and discharge, charge and discharge blanking voltage 4.2V 3.0V, and as a result show first discharge specific capacity as 130 144mAh/g, for cycle after 20 weeks, capacity retention ratio is 86 75%.Advantage is：The structure of solid lithium ion battery includes anode, electrolyte, cathode, is all made of solid-state material, wherein solid electrolyte is while conducting lithium ions so that battery building process is significantly simplified.
Description
Technical field
The present invention relates to new energy lithium electrical domain more particularly to a kind of synthesis of solid state lithium battery, have further related to one kind
The preparation method of graphite composite negative plate, also a kind of preparation method of iron lithium phosphate compound anode piece.
Background technology
Commercial li-ion battery is generally using organic liquid electrolytes and gel state electrolyte at present, inevitably in electricity
Volatile, inflammable, explosive organic liquid is introduced in pond body system, serious security risk and organic is brought to battery system
Liquid and gel state electrolyte are compared, and solid electrolyte has higher safety, thermal stability, electrochemical stability.Therefore,
By electrolyte be substituted for solid electrolyte, exploitation all-solid lithium-ion battery, be fundamentally solve safety problem it is necessary it
Road.All-solid lithium-ion battery provides a kind of possibility for cathode using lithium metal, however metal Li has in cyclic process
The generation of Li dendrite can not only make to reduce for embedding/de- lithium amount, can more seriously cause the safety problems such as short circuit, simultaneously
Metal Li ten divides vivaciously, easily reacts, and metal Li is unable to high temperature resistant with the oxygen in air and moisture etc., to battery
Assembling and application bring difficulty, therefore to realize at this stage cathode using lithium metal carry out large-scale batch production still remain
Very big challenge.Graphitic carbon material is most widely used in Current commercial lithium ion battery while is also cathode material the most ripe
Material has and is suitable for that lithium ion is embedded and the layer structure of abjection, has a good voltage platform, efficiency for charge-discharge 90% with
On, although theoretical capacity is relatively low (being only 372mAh/g), still have in some occasions higher to security requirement
Important application.
Invention content
The purpose of the present invention is：A kind of synthesis of solid state lithium battery and a kind of graphite composite negative plate and LiFePO4 are provided
The preparation method of anode composite piece is made by the composite cathode material of silicon/carbon/graphite collocation iron phosphate compound anode material of lithium of the present invention
Solid state battery is under 0.3C electric currents, and capacity plays maximum reachable 144mAh/g, and synthetic method disclosed by the invention has big rule
The possibility of mould batch production.
In order to achieve the above objectives, the technical solution adopted by the present invention is：
A kind of synthesis of solid state lithium battery, the solid lithium ion battery synthesis step：Step 1：LiFePO4 is compound
Positive plate and polyethylene oxide base lithium ion conductor solid electrolyte, graphite composite negative plate carries out lamination, assembling obtains solid-state
Lithium ion battery；
Step 2：Solid lithium ion battery will be obtained in 60 DEG C, 0.3C charge and discharge, charge and discharge blanking voltage 2.8V-3.7V
Under conditions of carry out charge and discharge cycles test, as a result show first discharge specific capacity as 130-144mAh/g, after recycling 400 weeks,
Capacity retention ratio is 93-88%.
A kind of preparation method of graphite composite negative plate, the preparation process of the graphite composite negative plate are as follows：Step 1：
According to mass ratio it is 73-88 by graphite material and conductive agent：3 are blended in blender；
Step 2：According to mass ratio it is 76-86 by the mixed-powder after blending and binding agent：4 be uniformly mixed obtain 1.2-
The mixture of 1.35kg is dispersed in the N-Methyl pyrrolidone solution of 1.5-1.69kg, is then injected into 1.23-
The complex electrolyte that 1.5kg is formed by polyethylene glycol oxide and lithium salts, wherein polyethylene glycol oxide：Lithium salts：N-Methyl pyrrolidone
The mass ratio of solution is 2:1:10；
Step 3：It is stirred with vacuum planetary mixer to obtain graphite composite negative pole slurry, it will with coating machine
Composite negative pole slurry is coated on the utter misery copper foil that thickness is 10um, and coating thickness 110um, the pole piece after winding is again 105
DEG C vacuum bakeout case in be dried for 24 hours, to dried electrode slice carry out roll-in (compacting control in 1.2-1.7mg/
Cm3), cutting obtains graphite composite negative plate.
The graphite material, including native graphite, Delanium, natural-artificial admixed graphite.
The conductive agent, including Surpe-P, acetylene black, KS-6, CNT, graphene, Ketjen black.
The lithium salts, including LiTFSI, LiClO4, LiBF 4, LiPF6, LiAsF6.
A kind of preparation method of iron lithium phosphate compound anode piece, the preparation process of the iron lithium phosphate compound anode piece is such as
Under：Step 1：According to LiFePO4, conductive agent, Kynoar, polyethylene glycol oxide, lithium salts according to mass ratio be 80：5：3：
7.4：4.6 are mixed into the mixture of 1kg；
Step 2：The mixture that step 1 obtains is scattered in the N-Methyl pyrrolidone solution of 1.5kg, uses vacuum
Planetary mixer obtains iron phosphate compound anode material of lithium after stirring；
Step 3：Use coating machine that anode sizing agent is coated on thickness in 16 μm of carbon-coated aluminum foils, coating thickness 200
μm, the drying temperature of coating machine is 130 DEG C, speed of service 300mm/min, and the pole piece after winding dries again in 105 DEG C of vacuum
It is dried in oven for 24 hours, roll-in (compacting control is in 2.0-2.4mg/cm3) is carried out to dried electrode slice, cutting obtains
Iron lithium phosphate compound anode piece.
Compared with traditional electrolyte lithium ion battery, all-solid lithium-ion battery has the advantage that：1st, solid lithium ion
The structure of battery includes anode, electrolyte, cathode, is all made of solid-state material, wherein solid electrolyte is in conducting lithium ions
While so that battery building process is significantly simplified；
2nd, completely eliminate the security risk of electrolytic corrosion and leakage, have higher thermal stability, battery case and
Cooling system module can be simplified, and mitigate battery weight, so as to improve energy density；
3rd, need not encapsulate liquid, support serially to be arranged under the overlay with bipolar mechanism, idle space in battery pack can be reduced, improved
Production efficiency；
4th, due to the solid-state properties of solid electrolyte, multiple electrodes can be superimposed, series connection in unit is made to prepare 12V and 24V
Big voltage single battery be possibly realized；
5th, electrochemical stability window is wide (up to more than 5V), can match high-voltage electrode material, energy density and power
Density is further enhanced；
6th, solid electrolyte is usually single ion conductor, there's almost no side reaction, therefore can obtain longer use
Service life, therefore the unique advantage of solid lithium ion battery make it all have in large-sized battery and ultra micro slimline battery field suitable
Big potentiality.
Description of the drawings
Fig. 1 is the SEM figures of the pole piece that composite cathode material of silicon/carbon/graphite is coated in the present invention；
Fig. 2 is the complete electric AC impedance that in the present invention prepared by composite cathode material of silicon/carbon/graphite/iron phosphate compound anode material of lithium
Figure；
Fig. 3 is the full electricity cycle figure that in the present invention prepared by composite cathode material of silicon/carbon/graphite/iron phosphate compound anode material of lithium；
Specific embodiment
The invention will be further described with reference to the accompanying drawings and embodiments：
Embodiment one：
A kind of solid state lithium battery synthesis, solid lithium ion battery synthesis step：Step 1：By LiFePO4 obtained above
Anode composite piece and polyethylene oxide base lithium ion conductor solid electrolyte, graphite composite negative plate carries out lamination, assembling obtains
Solid lithium ion battery；
Step 2：Solid lithium ion battery will be obtained in 60 DEG C, 0.3C charge and discharge, charge and discharge blanking voltage 2.8V-3.7V
Under conditions of carry out charge and discharge cycles test, as a result show first discharge specific capacity as 144mAh/g, after recycling 400 weeks, capacity
Conservation rate is 93%.
A kind of preparation method of graphite composite negative plate, the preparation process of the graphite composite negative plate are as follows：Step 1：
According to mass ratio it is 73 by graphite material and conductive agent：3 are blended in blender；
Step 2：According to mass ratio it is 76 by the mixed-powder after blending and binding agent：4 be uniformly mixed obtain 1.2kg's
Mixture is dispersed in the N-Methyl pyrrolidone solution of 1.5kg, be then injected into 1.3kg by polyethylene glycol oxide and
The complex electrolyte that lithium salts is formed, wherein polyethylene glycol oxide：Lithium salts：The mass ratio of N-Methyl pyrrolidone solution is 2:1:
10；
Step 3：It is stirred with vacuum planetary mixer to obtain graphite composite negative pole slurry, it will with coating machine
Composite negative pole slurry is coated on the utter misery copper foil that thickness is 10um, and coating thickness 110um, the pole piece after winding is again 105
DEG C vacuum bakeout case in be dried for 24 hours, to dried electrode slice carry out roll-in (compacting control in 1.2-1.7mg/
Cm3), cutting obtains composite negative plate.
The graphite material, including native graphite, Delanium, natural-artificial admixed graphite.
The conductive agent, including Surpe-P, acetylene black, KS-6, CNT, graphene, Ketjen black.
The lithium salts, including LiTFSI, LiClO4, LiBF 4, LiPF6, LiAsF6.
A kind of preparation method of iron lithium phosphate compound anode piece, the preparation process of the iron lithium phosphate compound anode piece is such as
Under：Step 1：According to LiFePO4, conductive agent, Kynoar, polyethylene glycol oxide, lithium salts according to mass ratio be 80：5：3：
7.4：4.6 are mixed into the mixture of 1kg；
Step 2：The mixture that step 1 obtains is scattered in the N-Methyl pyrrolidone solution of 1.5kg, uses vacuum
Planetary mixer obtains iron phosphate compound anode material of lithium after stirring；
Step 3：Use coating machine that anode sizing agent is coated on thickness in 16 μm of carbon-coated aluminum foils, coating thickness 200
μm, the drying temperature of coating machine is 130 DEG C, speed of service 300mm/min, and the pole piece after winding dries again in 105 DEG C of vacuum
It is dried in oven for 24 hours, roll-in (compacting control is in 2.0-2.4mg/cm3) is carried out to dried electrode slice, cutting obtains
Iron lithium phosphate compound anode piece.
Compared with traditional electrolyte lithium ion battery, all-solid lithium-ion battery has the advantage that：1st, solid lithium ion
The structure of battery includes anode, electrolyte, cathode, is all made of solid-state material, wherein solid electrolyte is in conducting lithium ions
While so that battery building process is significantly simplified；
2nd, completely eliminate the security risk of electrolytic corrosion and leakage, have higher thermal stability, battery case and
Cooling system module can be simplified, and mitigate battery weight, so as to improve energy density；
3rd, need not encapsulate liquid, support serially to be arranged under the overlay with bipolar mechanism, idle space in battery pack can be reduced, improved
Production efficiency；
4th, due to the solid-state properties of solid electrolyte, multiple electrodes can be superimposed, series connection in unit is made to prepare 12V and 24V
Big voltage single battery be possibly realized；
5th, electrochemical stability window is wide (up to more than 5V), can match high-voltage electrode material, energy density and power
Density is further enhanced；
6th, solid electrolyte is usually single ion conductor, there's almost no side reaction, therefore can obtain longer use
Service life, therefore the unique advantage of solid lithium ion battery make it all have in large-sized battery and ultra micro slimline battery field suitable
Big potentiality.
Embodiment two：
A kind of synthesis of solid state lithium battery, solid lithium ion battery synthesis step：Step 1：By ferric phosphate obtained above
Lithium anode composite piece and polyethylene oxide base lithium ion conductor solid electrolyte, graphite composite negative plate carry out lamination, assemble
To solid lithium ion battery；
Step 2：Solid lithium ion battery will be obtained in 60 DEG C, 0.3C charge and discharge, charge and discharge blanking voltage 2.8V-3.7V
Under conditions of carry out charge and discharge cycles test, as a result show first discharge specific capacity as 140mAh/g, after recycling 400 weeks, capacity
Conservation rate is 91%.
A kind of preparation method of graphite composite negative plate, the preparation process of the graphite composite negative plate are as follows：Step 1：
According to mass ratio it is 78 by graphite material and conductive agent：3 are blended in blender；
Step 2：According to mass ratio it is 78 by the mixed-powder after blending and binding agent：4 be uniformly mixed obtain 1.26kg's
Mixture is dispersed in the N-Methyl pyrrolidone solution of 1.57kg, is then injected into 1.27kg by polyethylene glycol oxide
And the complex electrolyte that lithium salts is formed, wherein polyethylene glycol oxide：Lithium salts：The mass ratio of N-Methyl pyrrolidone solution is 2:1:
10；
Step 3：It is stirred with vacuum planetary mixer to obtain graphite composite negative pole slurry, it will with coating machine
Composite negative pole slurry is coated on the utter misery copper foil that thickness is 10um, and coating thickness 110um, the pole piece after winding is again 105
DEG C vacuum bakeout case in be dried for 24 hours, to dried electrode slice carry out roll-in (compacting control in 1.2-1.7mg/
Cm3), cutting obtains composite negative plate.
The graphite material, including native graphite, Delanium, natural-artificial admixed graphite.
The conductive agent, including Surpe-P, acetylene black, KS-6, CNT, graphene, Ketjen black.
The lithium salts, including LiTFSI, LiClO4, LiBF 4, LiPF6, LiAsF6.
A kind of preparation method of iron lithium phosphate compound anode piece, the preparation process of the iron lithium phosphate compound anode piece is such as
Under：Step 1：According to LiFePO4, conductive agent, Kynoar, polyethylene glycol oxide, lithium salts according to mass ratio be 80：5：3：
7.4：4.6 are mixed into the mixture of 1kg；
Step 2：The mixture that step 1 obtains is scattered in the N-Methyl pyrrolidone solution of 1.5kg, uses vacuum
Planetary mixer obtains iron phosphate compound anode material of lithium after stirring；
Step 3：Use coating machine that anode sizing agent is coated on thickness in 16 μm of carbon-coated aluminum foils, coating thickness 200
μm, the drying temperature of coating machine is 130 DEG C, speed of service 300mm/min, and the pole piece after winding dries again in 105 DEG C of vacuum
It is dried in oven for 24 hours, roll-in (compacting control is in 2.0-2.4mg/cm3) is carried out to dried electrode slice, cutting obtains
Iron lithium phosphate compound anode piece.
Compared with traditional electrolyte lithium ion battery, all-solid lithium-ion battery has the advantage that：1st, solid lithium ion
The structure of battery includes anode, electrolyte, cathode, is all made of solid-state material, wherein solid electrolyte is in conducting lithium ions
While so that battery building process is significantly simplified；
2nd, completely eliminate the security risk of electrolytic corrosion and leakage, have higher thermal stability, battery case and
Cooling system module can be simplified, and mitigate battery weight, so as to improve energy density；
3rd, need not encapsulate liquid, support serially to be arranged under the overlay with bipolar mechanism, idle space in battery pack can be reduced, improved
Production efficiency；
4th, due to the solid-state properties of solid electrolyte, multiple electrodes can be superimposed, series connection in unit is made to prepare 12V and 24V
Big voltage single battery be possibly realized；
5th, electrochemical stability window is wide (up to more than 5V), can match high-voltage electrode material, energy density and power
Density is further enhanced；
6th, solid electrolyte is usually single ion conductor, there's almost no side reaction, therefore can obtain longer use
Service life, therefore the unique advantage of solid lithium ion battery make it all have in large-sized battery and ultra micro slimline battery field suitable
Big potentiality.
Embodiment three：
A kind of synthesis of solid state lithium battery, solid lithium ion battery synthesis step：Step 1：By ferric phosphate obtained above
Lithium anode composite piece and polyethylene oxide base lithium ion conductor solid electrolyte, graphite composite negative plate carry out lamination, assemble
To solid lithium ion battery；
Step 2：Solid lithium ion battery will be obtained in 60 DEG C, 0.3C charge and discharge, charge and discharge blanking voltage 2.8V-3.7V
Under conditions of carry out charge and discharge cycles test, as a result show first discharge specific capacity as 135mAh/g, after recycling 400 weeks, capacity
Conservation rate is 89%.
A kind of preparation method of graphite composite negative plate, the preparation process of the graphite composite negative plate are as follows：Step 1：
According to mass ratio it is 83 by graphite material and conductive agent：3 are blended in blender；
Step 2：According to mass ratio it is 81 by the mixed-powder after blending and binding agent：4 be uniformly mixed obtain 1.27kg's
Mixture is dispersed in the N-Methyl pyrrolidone solution of 1.58kg, is then injected into 1.23kg by polyethylene glycol oxide
And the complex electrolyte that lithium salts is formed, wherein polyethylene glycol oxide：Lithium salts：The mass ratio of N-Methyl pyrrolidone solution is 2:1:
10；
Step 3：It is stirred with vacuum planetary mixer to obtain graphite composite negative pole slurry, it will with coating machine
Composite negative pole slurry is coated on the utter misery copper foil that thickness is 10um, and coating thickness 110um, the pole piece after winding is again 105
DEG C vacuum bakeout case in be dried for 24 hours, to dried electrode slice carry out roll-in (compacting control in 1.2-1.7mg/
Cm3), cutting obtains composite negative plate.
The graphite material, including native graphite, Delanium, natural-artificial admixed graphite.
The conductive agent, including Surpe-P, acetylene black, KS-6, CNT, graphene, Ketjen black.
The lithium salts, including LiTFSI, LiClO4, LiBF 4, LiPF6, LiAsF6.
A kind of preparation method of iron lithium phosphate compound anode piece, the preparation process of the iron lithium phosphate compound anode piece is such as
Under：Step 1：According to LiFePO4, conductive agent, Kynoar, polyethylene glycol oxide, lithium salts according to mass ratio be 80：5：3：
7.4：4.6 are mixed into the mixture of 1kg；
Step 2：The mixture that step 1 obtains is scattered in the N-Methyl pyrrolidone solution of 1.5kg, uses vacuum
Planetary mixer obtains iron phosphate compound anode material of lithium after stirring；
Step 3：Use coating machine that anode sizing agent is coated on thickness in 16 μm of carbon-coated aluminum foils, coating thickness 200
μm, the drying temperature of coating machine is 130 DEG C, speed of service 300mm/min, and the pole piece after winding dries again in 105 DEG C of vacuum
It is dried in oven for 24 hours, roll-in (compacting control is in 2.0-2.4mg/cm3) is carried out to dried electrode slice, cutting obtains
Iron lithium phosphate compound anode piece.
Compared with traditional electrolyte lithium ion battery, all-solid lithium-ion battery has the advantage that：1st, solid lithium ion
The structure of battery includes anode, electrolyte, cathode, is all made of solid-state material, wherein solid electrolyte is in conducting lithium ions
While so that battery building process is significantly simplified；
2nd, completely eliminate the security risk of electrolytic corrosion and leakage, have higher thermal stability, battery case and
Cooling system module can be simplified, and mitigate battery weight, so as to improve energy density；
3rd, need not encapsulate liquid, support serially to be arranged under the overlay with bipolar mechanism, idle space in battery pack can be reduced, improved
Production efficiency；
4th, due to the solid-state properties of solid electrolyte, multiple electrodes can be superimposed, series connection in unit is made to prepare 12V and 24V
Big voltage single battery be possibly realized；
5th, electrochemical stability window is wide (up to more than 5V), can match high-voltage electrode material, energy density and power
Density is further enhanced；
6th, solid electrolyte is usually single ion conductor, there's almost no side reaction, therefore can obtain longer use
Service life, therefore the unique advantage of solid lithium ion battery make it all have in large-sized battery and ultra micro slimline battery field suitable
Big potentiality.
Example IV：
A kind of synthesis of solid state lithium battery, solid lithium ion battery synthesis step：Step 1：By ferric phosphate obtained above
Lithium anode composite piece and polyethylene oxide base lithium ion conductor solid electrolyte, graphite composite negative plate carry out lamination, assemble
To solid lithium ion battery；
Step 2：Solid lithium ion battery will be obtained in 60 DEG C, 0.3C charge and discharge, charge and discharge blanking voltage 2.8V-3.7V
Under conditions of carry out charge and discharge cycles test, as a result show first discharge specific capacity as 130mAh/g, after recycling 400 weeks, capacity
Conservation rate is 88%.
A kind of preparation method of graphite composite negative plate, the preparation process of the graphite composite negative plate are as follows：Step 1：
According to mass ratio it is 88 by graphite material and conductive agent：3 are blended in blender；
Step 2：According to mass ratio it is 86 by the mixed-powder after blending and binding agent：4 be uniformly mixed obtain 1.35kg's
Mixture is dispersed in the N-Methyl pyrrolidone solution of 1.69kg, be then injected into 1.5kg by polyethylene glycol oxide and
The complex electrolyte that lithium salts is formed, wherein polyethylene glycol oxide：Lithium salts：The mass ratio of N-Methyl pyrrolidone solution is 2:1:
10；
Step 3：It is stirred with vacuum planetary mixer to obtain graphite composite negative pole slurry, it will with coating machine
Composite negative pole slurry is coated on the utter misery copper foil that thickness is 10um, and coating thickness 110um, the pole piece after winding is again 105
DEG C vacuum bakeout case in be dried for 24 hours, to dried electrode slice carry out roll-in (compacting control in 1.2-1.7mg/
Cm3), cutting obtains composite negative plate.
The graphite material, including native graphite, Delanium, natural-artificial admixed graphite.
The conductive agent, including Surpe-P, acetylene black, KS-6, CNT, graphene, Ketjen black.
The lithium salts, including LiTFSI, LiClO4, LiBF 4, LiPF6, LiAsF6.
A kind of preparation method of iron lithium phosphate compound anode piece, the preparation process of the iron lithium phosphate compound anode piece is such as
Under：Step 1：According to LiFePO4, conductive agent, Kynoar, polyethylene glycol oxide, lithium salts according to mass ratio be 80：5：3：
7.4：4.6 are mixed into the mixture of 1kg；
Step 2：The mixture that step 1 obtains is scattered in the N-Methyl pyrrolidone solution of 1.5kg, uses vacuum
Planetary mixer obtains iron phosphate compound anode material of lithium after stirring；
Step 3：Use coating machine that anode sizing agent is coated on thickness in 16 μm of carbon-coated aluminum foils, coating thickness 200
μm, the drying temperature of coating machine is 130 DEG C, speed of service 300mm/min, and the pole piece after winding dries again in 105 DEG C of vacuum
It is dried in oven for 24 hours, roll-in (compacting control is in 2.0-2.4mg/cm3) is carried out to dried electrode slice, cutting obtains
Iron lithium phosphate compound anode piece.
Compared with traditional electrolyte lithium ion battery, all-solid lithium-ion battery has the advantage that：1st, solid lithium ion
The structure of battery includes anode, electrolyte, cathode, is all made of solid-state material, wherein solid electrolyte is in conducting lithium ions
While so that battery building process is significantly simplified；
2nd, completely eliminate the security risk of electrolytic corrosion and leakage, have higher thermal stability, battery case and
Cooling system module can be simplified, and mitigate battery weight, so as to improve energy density；
3rd, need not encapsulate liquid, support serially to be arranged under the overlay with bipolar mechanism, idle space in battery pack can be reduced, improved
Production efficiency；
4th, due to the solid-state properties of solid electrolyte, multiple electrodes can be superimposed, series connection in unit is made to prepare 12V and 24V
Big voltage single battery be possibly realized；
5th, electrochemical stability window is wide (up to more than 5V), can match high-voltage electrode material, energy density and power
Density is further enhanced；
6th, solid electrolyte is usually single ion conductor, there's almost no side reaction, therefore can obtain longer use
Service life, therefore the unique advantage of solid lithium ion battery make it all have in large-sized battery and ultra micro slimline battery field suitable
Big potentiality.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of synthesis of solid state lithium battery, it is characterised in that：The solid lithium ion battery synthesis step：
Step 1：By iron lithium phosphate compound anode piece and polyethylene oxide base lithium ion conductor solid electrolyte, graphite Compound Negative
Pole piece carries out lamination, assembling obtains solid lithium ion battery；
Step 2：Solid lithium ion battery will be obtained in 60 DEG C, 0.3C charge and discharge, the item of charge and discharge blanking voltage 2.8V-3.7V
Charge and discharge cycles test is carried out under part, as a result shows first discharge specific capacity as 130-144mAh/g, cycle is after 400 weeks, capacity
Conservation rate is 93-88%.
2. a kind of preparation method of graphite composite negative plate according to claim 1, it is characterised in that：The graphite is compound
The preparation process of negative plate is as follows：Step 1：According to mass ratio it is 73-88 by graphite material and conductive agent：3 is common in blender
It is mixed；
Step 2：According to mass ratio it is 76-86 by the mixed-powder after blending and binding agent：4 be uniformly mixed obtain 1.2-
The mixture of 1.35kg is dispersed in the N-Methyl pyrrolidone solution of 1.5-1.69kg, is then injected into 1.23-
The complex electrolyte that 1.5kg is formed by polyethylene glycol oxide and lithium salts, wherein polyethylene glycol oxide：Lithium salts：N-Methyl pyrrolidone
The mass ratio of solution is 2:1:10；
Step 3：It is stirred with vacuum planetary mixer to obtain graphite composite negative pole slurry, it will be compound with coating machine
Negative electrode slurry is coated on the utter misery copper foil that thickness is 10um, and coating thickness 110um, the pole piece after winding is again at 105 DEG C
It is dried in vacuum bakeout case for 24 hours, roll-in (compacting control is in 1.2-1.7mg/cm3) is carried out to dried electrode slice, point
It cuts to obtain graphite composite negative plate.
3. a kind of preparation method of graphite composite negative plate according to claim 1, it is characterised in that：The graphite material
Material, including native graphite, Delanium, natural-artificial admixed graphite.
4. a kind of preparation method of graphite composite negative plate according to claim 1, it is characterised in that：The conductive agent,
Including Surpe-P, acetylene black, KS-6, CNT, graphene, Ketjen black.
5. a kind of preparation method of graphite composite negative plate according to claim 1, it is characterised in that：The lithium salts, packet
Include LiTFSI, LiClO4, LiBF 4, LiPF6, LiAsF6.
6. a kind of preparation method of iron lithium phosphate compound anode piece according to claim 1, it is characterised in that：The phosphoric acid
The preparation process of iron lithium anode composite piece is as follows：Step 1：According to LiFePO4, conductive agent, Kynoar, polyoxyethylene
Alkene, lithium salts are 80 according to mass ratio：5：3：7.4：4.6 are mixed into the mixture of 1kg；
Step 2：The mixture that step 1 obtains is scattered in the N-Methyl pyrrolidone solution of 1.5kg, uses vacuum planet
Blender obtains iron phosphate compound anode material of lithium after stirring；
Step 3：Use coating machine that anode sizing agent is coated on thickness in 16 μm of carbon-coated aluminum foils, coating thickness is 200 μm,
The drying temperature of coating machine is 130 DEG C, speed of service 300mm/min, and the pole piece after winding is again in 105 DEG C of vacuum bakeout case
In be dried for 24 hours, roll-in (compacting control in 2.0-2.4mg/cm3) is carried out to dried electrode slice, cutting obtains phosphoric acid
Iron lithium anode composite piece.
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| CN114373884A (en) * | 2021-12-15 | 2022-04-19 | 浙江锋锂新能源科技有限公司 | Lithium metal solid-state battery with positive electrode and high safety and high cyclicity |
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