CN108232120B - Synthesis of solid-state lithium battery and preparation method of graphite composite negative plate and lithium iron phosphate composite positive plate - Google Patents

Synthesis of solid-state lithium battery and preparation method of graphite composite negative plate and lithium iron phosphate composite positive plate Download PDF

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CN108232120B
CN108232120B CN201810005859.XA CN201810005859A CN108232120B CN 108232120 B CN108232120 B CN 108232120B CN 201810005859 A CN201810005859 A CN 201810005859A CN 108232120 B CN108232120 B CN 108232120B
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冯玉川
李峥
何泓材
李培养
杨帆
南策文
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Qingtao Kunshan Energy Development Co ltd
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Abstract

The invention discloses a synthesis of a solid-state lithium battery, which is characterized in that: the solid lithium ion battery comprises the following steps: the method comprises the following steps: laminating and assembling a lithium iron phosphate composite positive plate, a polyoxyethylene-based lithium ion conductor solid electrolyte and a graphite composite negative plate to obtain a solid lithium ion battery; step two: the obtained solid lithium ion battery is subjected to charge-discharge cycle test under the conditions of charge-discharge at 60 ℃, 0.3C and charge-discharge cutoff voltage of 4.2V-3.0V, and the result shows that the first discharge specific capacity is 130-144mAh/g, and the capacity retention rate is 86-75% after 20 weeks of cycle. The advantages are that: the structure of the solid lithium ion battery comprises a positive electrode, an electrolyte and a negative electrode, which are all made of solid materials, wherein the solid electrolyte conducts lithium ions, and meanwhile, the construction process of the battery is greatly simplified.

Description

Synthesis of solid-state lithium battery and preparation method of graphite composite negative plate and lithium iron phosphate composite positive plate
Technical Field
The invention relates to the field of new energy lithium batteries, in particular to synthesis of a solid lithium battery, a preparation method of a graphite composite negative plate and a preparation method of a lithium iron phosphate composite positive plate.
Background
At present, the commercial lithium ion battery generally adopts organic liquid electrolyte and gel electrolyte, and the introduction of volatile, flammable and explosive organic liquid into a battery system is inevitable, so that serious potential safety hazards are brought to the battery system, and compared with the organic liquid electrolyte and the gel electrolyte, the solid electrolyte has higher safety, thermal stability and electrochemical stability. Therefore, replacing the electrolyte with the solid electrolyte and developing the all-solid-state lithium ion battery are necessary ways to fundamentally solve the safety problem. The all-solid-state lithium ion battery provides a possibility for adopting metal lithium for the cathode, however, lithium dendrite is generated in the circulation process of the metal Li, so that the lithium amount which can be inserted/removed is reduced, and the safety problems such as short circuit and the like can be caused more seriously, meanwhile, the metal Li is very active and is easy to react with oxygen, water and the like in the air, and the metal Li cannot resist high temperature, so that the assembly and application of the battery are difficult, and therefore, the large-scale mass production of the cathode by adopting the metal lithium still has great challenges at the present stage. The graphite carbon material is the most widely applied and mature cathode material in the current commercial lithium ion battery, has a layered structure suitable for lithium ion insertion and extraction, has a good voltage platform, has a charge-discharge efficiency of over 90 percent, and has important application in some occasions with high requirements on safety although the theoretical capacity is low (only 372 mA.h/g).
Disclosure of Invention
The purpose of the invention is: the invention provides a synthesis method of a solid-state lithium battery and a preparation method of a graphite composite negative plate and a lithium iron phosphate composite positive plate, the solid-state battery prepared by matching the graphite composite negative material with the lithium iron phosphate composite positive plate material has the capacity exertion maximum reaching 144mAh/g under the current of 0.3C, and the synthesis method disclosed by the invention has the possibility of large-scale batch production.
In order to achieve the purpose, the invention adopts the technical scheme that:
the synthesis of the solid-state lithium battery comprises the following steps: the method comprises the following steps: laminating and assembling a lithium iron phosphate composite positive plate, a polyoxyethylene-based lithium ion conductor solid electrolyte and a graphite composite negative plate to obtain a solid lithium battery;
step two: the obtained solid lithium battery is subjected to charge-discharge cycle test under the conditions of charge-discharge at 60 ℃, 0.3C and charge-discharge cutoff voltage of 2.8V-3.7V, and the result shows that the first discharge specific capacity is 130-144mAh/g, and the capacity retention ratio is 93-88% after 400 cycles.
A preparation method of a graphite composite negative plate comprises the following steps: the method comprises the following steps: the graphite material and the conductive agent are mixed according to the mass ratio of 73-88: 3 blending in a blender;
step two: mixing the mixed powder and the binder according to the mass ratio of 76-86: 4 to obtain 1.2 to 1.35kg of a mixture, uniformly dispersing the mixture in 1.5 to 1.69kg of an N-methylpyrrolidone solution, and then injecting 1.23 to 1.5kg of a complex electrolyte formed by polyethylene oxide and a lithium salt, wherein the weight ratio of polyethylene oxide: lithium salt: the mass ratio of the N-methylpyrrolidone solution is 2:1: 10;
step three: stirring thoroughly with vacuum planetary stirrer to obtain graphite composite negative electrode slurry, coating the composite negative electrode slurry on carbon-coated copper foil with thickness of 10 μm with coating machine to coat thickness of 110 μm, drying the wound electrode sheet in vacuum oven at 105 deg.C for 24 hr, and rolling the dried electrode sheet (compaction is controlled at 1.2-1.7 mg/cm)3) And cutting to obtain the graphite composite negative plate.
The graphite material comprises natural graphite, artificial graphite and natural-artificial mixed graphite.
The conductive agent comprises Surpe-P, acetylene black, KS-6, CNT, graphene and Ketjen black.
The lithium salt comprises LiTFSI and LiClO4，LiBF4，LiPF6，LiAsF6。
A preparation method of a lithium iron phosphate composite positive plate comprises the following steps: the method comprises the following steps: according to the mass ratio of lithium iron phosphate, a conductive agent, polyvinylidene fluoride, polyoxyethylene and lithium salt to be 80: 5: 3: 7.4: 4.6 to 1kg of mixture;
step two: dispersing the mixture obtained in the step one in 1.5kg of N-methyl pyrrolidone solution, and fully and uniformly stirring by using a vacuum planetary stirrer to obtain a lithium iron phosphate composite anode material;
step three: coating the positive electrode slurry on a carbon-coated aluminum foil with the thickness of 16 mu m by a coating machine with the coating thickness of 200 mu m, drying the coating machine at the drying temperature of 130 ℃ and the running speed of 300mm/min, drying the wound electrode piece in a vacuum baking oven at the temperature of 105 ℃ for 24h, and rolling the dried electrode piece (the compaction is controlled to be 2.0-2.4 mg/cm)3) And slitting to obtain the lithium iron phosphate composite positive plate.
Compared with the traditional electrolyte lithium ion battery, the all-solid-state lithium battery has the following advantages: 1. the structure of the solid-state lithium battery comprises a positive electrode, an electrolyte and a negative electrode, which are all made of solid-state materials, wherein the solid electrolyte conducts lithium ions, and meanwhile, the construction process of the battery is greatly simplified;
2. the potential safety hazards of corrosion and leakage of the electrolyte are completely eliminated, the thermal stability is higher, the battery shell and the cooling system module can be simplified, the weight of the battery is reduced, and the energy density is improved;
3. liquid does not need to be packaged, serial overlapping arrangement and a bipolar mechanism are supported, invalid space in the battery pack can be reduced, and production efficiency is improved;
4. due to the solid-state characteristic of the solid electrolyte, a plurality of electrodes can be superposed, so that the preparation of 12V and 24V high-voltage single batteries in series in a unit becomes possible;
5. the electrochemical stability window is wide (can reach more than 5V), can match with high-voltage electrode materials, and further improves the energy density and the power density;
6. the solid electrolyte is generally a single ion conductor, and almost has no side reaction, so that the service life of the solid electrolyte can be longer, and the unique advantages of the solid lithium battery enable the solid lithium battery to have considerable potential in the fields of large batteries and ultra-thin batteries.
Drawings
FIG. 1 is an SEM image of the surface of a pole piece coated with a graphite composite negative electrode material according to the present invention;
FIG. 2 is a diagram of the full-electric AC impedance of the graphite composite negative electrode material/lithium iron phosphate composite positive electrode material prepared in the present invention;
FIG. 3 is a full electrical cycle diagram for the preparation of a graphite composite negative electrode material/lithium iron phosphate composite positive electrode material in the present invention;
Detailed Description
The invention is further described with reference to the following figures and examples:
the first embodiment is as follows:
a solid lithium battery synthesis method comprises the following steps: the method comprises the following steps: laminating and assembling the obtained lithium iron phosphate composite positive plate, a polyoxyethylene-based lithium ion conductor solid electrolyte and a graphite composite negative plate to obtain a solid lithium battery;
step two: the obtained solid lithium battery is subjected to charge-discharge cycle test under the conditions of 60 ℃, 0.3C charge-discharge and charge-discharge cutoff voltage of 2.8V-3.7V, and the result shows that the first discharge specific capacity is 144mAh/g, and the capacity retention rate is 93% after 400 weeks of cycle.
A preparation method of a graphite composite negative plate comprises the following steps: the method comprises the following steps: the graphite material and the conductive agent are mixed according to the mass ratio of 73: 3 blending in a blender;
step two: mixing the mixed powder and the binder according to a mass ratio of 76: 4 to obtain 1.2kg of a mixture, uniformly dispersed in 1.5kg of an N-methylpyrrolidone solution, and then injected with 1.3kg of a complex electrolyte formed of polyethylene oxide and a lithium salt, wherein the weight ratio of polyethylene oxide: lithium salt: the mass ratio of the N-methylpyrrolidone solution is 2:1: 10;
step three: stirring thoroughly with vacuum planetary stirrer to obtain graphite composite negative electrode slurry, coating the composite negative electrode slurry on carbon-coated copper foil with thickness of 10 μm with coating machine to coat thickness of 110 μm, drying the wound electrode sheet in vacuum oven at 105 deg.C for 24 hr, and rolling the dried electrode sheet (compaction is controlled at 1.2-1.7 mg/cm)3) Slitting to obtain a compositeAnd a negative plate.
The graphite material comprises natural graphite, artificial graphite and natural-artificial mixed graphite.
The conductive agent comprises Surpe-P, acetylene black, KS-6, CNT, graphene and Ketjen black.
The lithium salt comprises LiTFSI and LiClO4，LiBF4，LiPF6，LiAsF6。
A preparation method of a lithium iron phosphate composite positive plate comprises the following steps: the method comprises the following steps: according to the mass ratio of lithium iron phosphate, a conductive agent, polyvinylidene fluoride, polyoxyethylene and lithium salt to be 80: 5: 3: 7.4: 4.6 to 1kg of mixture;
step two: dispersing the mixture obtained in the step one in 1.5kg of N-methyl pyrrolidone solution, and fully and uniformly stirring by using a vacuum planetary stirrer to obtain a lithium iron phosphate composite anode material;
step three: coating the positive electrode slurry on a carbon-coated aluminum foil with the thickness of 16 mu m by a coating machine with the coating thickness of 200 mu m, drying the coating machine at the drying temperature of 130 ℃ and the running speed of 300mm/min, drying the wound electrode piece in a vacuum baking oven at the temperature of 105 ℃ for 24h, and rolling the dried electrode piece (the compaction is controlled to be 2.0-2.4 mg/cm)3) And slitting to obtain the lithium iron phosphate composite positive plate.
Compared with the traditional electrolyte lithium ion battery, the all-solid-state lithium battery has the following advantages: 1. the structure of the solid-state lithium battery comprises a positive electrode, an electrolyte and a negative electrode, which are all made of solid-state materials, wherein the solid electrolyte conducts lithium ions, and meanwhile, the construction process of the battery is greatly simplified;
2. the potential safety hazards of corrosion and leakage of the electrolyte are completely eliminated, the thermal stability is higher, the battery shell and the cooling system module can be simplified, the weight of the battery is reduced, and the energy density is improved;
3. liquid does not need to be packaged, serial overlapping arrangement and a bipolar mechanism are supported, invalid space in the battery pack can be reduced, and production efficiency is improved;
4. due to the solid-state characteristic of the solid electrolyte, a plurality of electrodes can be superposed, so that the preparation of 12V and 24V high-voltage single batteries in series in a unit becomes possible;
5. the electrochemical stability window is wide (can reach more than 5V), can match with high-voltage electrode materials, and further improves the energy density and the power density;
6. the solid electrolyte is generally a single ion conductor, and almost has no side reaction, so that the service life of the solid electrolyte can be longer, and the unique advantages of the solid lithium battery enable the solid lithium battery to have considerable potential in the fields of large batteries and ultra-thin batteries.
Example two:
the synthesis of the solid-state lithium battery comprises the following steps: the method comprises the following steps: laminating and assembling the obtained lithium iron phosphate composite positive plate, a polyoxyethylene-based lithium ion conductor solid electrolyte and a graphite composite negative plate to obtain a solid lithium battery;
step two: the obtained solid lithium battery is subjected to charge-discharge cycle test under the conditions of 60 ℃, 0.3C charge-discharge and charge-discharge cutoff voltage of 2.8V-3.7V, and the result shows that the first discharge specific capacity is 140mAh/g, and the capacity retention rate is 91% after 400 weeks of cycle.
A preparation method of a graphite composite negative plate comprises the following steps: the method comprises the following steps: graphite materials and conductive agents are mixed according to the mass ratio of 78: 3 blending in a blender;
step two: mixing the mixed powder and a binder according to a mass ratio of 78: 4 to obtain 1.26kg of a mixture, uniformly dispersed in 1.57kg of an N-methylpyrrolidone solution, and then injected with 1.27kg of a complex electrolyte formed of polyethylene oxide and a lithium salt, wherein the weight ratio of polyethylene oxide: lithium salt: the mass ratio of the N-methylpyrrolidone solution is 2:1: 10;
step three: stirring with vacuum planetary stirrer to obtain graphite composite negative electrode slurry, coating the composite negative electrode slurry on carbon-coated copper foil with thickness of 10 μm with coating machine to obtain coating thickness of 110 μm, drying the wound pole piece in vacuum oven at 105 deg.C for 24 hr, and dryingRolling the dried electrode slice (the compaction is controlled to be 1.2-1.7 mg/cm)3) And slitting to obtain the composite negative plate.
The graphite material comprises natural graphite, artificial graphite and natural-artificial mixed graphite.
The conductive agent comprises Surpe-P, acetylene black, KS-6, CNT, graphene and Ketjen black.
The lithium salt comprises LiTFSI and LiClO4，LiBF4，LiPF6，LiAsF6。
A preparation method of a lithium iron phosphate composite positive plate comprises the following steps: the method comprises the following steps: according to the mass ratio of lithium iron phosphate, a conductive agent, polyvinylidene fluoride, polyoxyethylene and lithium salt to be 80: 5: 3: 7.4: 4.6 to 1kg of mixture;
step two: dispersing the mixture obtained in the step one in 1.5kg of N-methyl pyrrolidone solution, and fully and uniformly stirring by using a vacuum planetary stirrer to obtain a lithium iron phosphate composite anode material;
step three: coating the positive electrode slurry on a carbon-coated aluminum foil with the thickness of 16 mu m by a coating machine with the coating thickness of 200 mu m, drying the coating machine at the drying temperature of 130 ℃ and the running speed of 300mm/min, drying the wound electrode piece in a vacuum baking oven at the temperature of 105 ℃ for 24h, and rolling the dried electrode piece (the compaction is controlled to be 2.0-2.4 mg/cm)3) And slitting to obtain the lithium iron phosphate composite positive plate.
Compared with the traditional electrolyte lithium ion battery, the all-solid-state lithium battery has the following advantages: 1. the structure of the solid-state lithium battery comprises a positive electrode, an electrolyte and a negative electrode, which are all made of solid-state materials, wherein the solid electrolyte conducts lithium ions, and meanwhile, the construction process of the battery is greatly simplified;
2. the potential safety hazards of corrosion and leakage of the electrolyte are completely eliminated, the thermal stability is higher, the battery shell and the cooling system module can be simplified, the weight of the battery is reduced, and the energy density is improved;
3. liquid does not need to be packaged, serial overlapping arrangement and a bipolar mechanism are supported, invalid space in the battery pack can be reduced, and production efficiency is improved;
4. due to the solid-state characteristic of the solid electrolyte, a plurality of electrodes can be superposed, so that the preparation of 12V and 24V high-voltage single batteries in series in a unit becomes possible;
5. the electrochemical stability window is wide (can reach more than 5V), can match with high-voltage electrode materials, and further improves the energy density and the power density;
6. the solid electrolyte is generally a single ion conductor, and almost has no side reaction, so that the service life of the solid electrolyte can be longer, and the unique advantages of the solid lithium battery enable the solid lithium battery to have considerable potential in the fields of large batteries and ultra-thin batteries.
Example three:
the synthesis of the solid-state lithium battery comprises the following steps: the method comprises the following steps: laminating and assembling the obtained lithium iron phosphate composite positive plate, a polyoxyethylene-based lithium ion conductor solid electrolyte and a graphite composite negative plate to obtain a solid lithium battery;
step two: the obtained solid lithium battery is subjected to charge-discharge cycle test under the conditions of 60 ℃, 0.3C charge-discharge and charge-discharge cutoff voltage of 2.8V-3.7V, and the result shows that the first discharge specific capacity is 135mAh/g, and the capacity retention rate is 89% after 400 cycles.
A preparation method of a graphite composite negative plate comprises the following steps: the method comprises the following steps: graphite materials and conductive agents are mixed according to the mass ratio of 83: 3 blending in a blender;
step two: mixing the mixed powder and the binder according to a mass ratio of 81: 4 to obtain 1.27kg of a mixture, uniformly dispersed in 1.58kg of an N-methylpyrrolidone solution, and then injected with 1.23kg of a complex electrolyte formed of polyethylene oxide and a lithium salt, wherein the weight ratio of polyethylene oxide: lithium salt: the mass ratio of the N-methylpyrrolidone solution is 2:1: 10;
step three: stirring with vacuum planetary stirrer to obtain graphite composite negative electrode slurry, and coating the composite negative electrode slurry on carbon-coated copper foil with thickness of 10 μm with coaterCoating thickness of 110 μm, drying the rolled pole piece in a vacuum oven at 105 deg.C for 24 hr, and rolling the dried pole piece (compaction is controlled at 1.2-1.7 mg/cm)3) And slitting to obtain the composite negative plate.
The graphite material comprises natural graphite, artificial graphite and natural-artificial mixed graphite.
The conductive agent comprises Surpe-P, acetylene black, KS-6, CNT, graphene and Ketjen black.
The lithium salt comprises LiTFSI and LiClO4，LiBF4，LiPF6，LiAsF6。
A preparation method of a lithium iron phosphate composite positive plate comprises the following steps: the method comprises the following steps: according to the mass ratio of lithium iron phosphate, a conductive agent, polyvinylidene fluoride, polyoxyethylene and lithium salt to be 80: 5: 3: 7.4: 4.6 to 1kg of mixture;
step two: dispersing the mixture obtained in the step one in 1.5kg of N-methyl pyrrolidone solution, and fully and uniformly stirring by using a vacuum planetary stirrer to obtain a lithium iron phosphate composite anode material;
step three: coating the positive electrode slurry on a carbon-coated aluminum foil with the thickness of 16 mu m by a coating machine with the coating thickness of 200 mu m, drying the coating machine at the drying temperature of 130 ℃ and the running speed of 300mm/min, drying the wound electrode piece in a vacuum baking oven at the temperature of 105 ℃ for 24h, and rolling the dried electrode piece (the compaction is controlled to be 2.0-2.4 mg/cm)3) And slitting to obtain the lithium iron phosphate composite positive plate.
Compared with the traditional electrolyte lithium ion battery, the all-solid-state lithium battery has the following advantages: 1. the structure of the solid-state lithium battery comprises a positive electrode, an electrolyte and a negative electrode, which are all made of solid-state materials, wherein the solid electrolyte conducts lithium ions, and meanwhile, the construction process of the battery is greatly simplified;
2. the potential safety hazards of corrosion and leakage of the electrolyte are completely eliminated, the thermal stability is higher, the battery shell and the cooling system module can be simplified, the weight of the battery is reduced, and the energy density is improved;
3. liquid does not need to be packaged, serial overlapping arrangement and a bipolar mechanism are supported, invalid space in the battery pack can be reduced, and production efficiency is improved;
4. due to the solid-state characteristic of the solid electrolyte, a plurality of electrodes can be superposed, so that the preparation of 12V and 24V high-voltage single batteries in series in a unit becomes possible;
5. the electrochemical stability window is wide (can reach more than 5V), can match with high-voltage electrode materials, and further improves the energy density and the power density;
6. the solid electrolyte is generally a single ion conductor, and almost has no side reaction, so that the service life of the solid electrolyte can be longer, and the unique advantages of the solid lithium battery enable the solid lithium battery to have considerable potential in the fields of large batteries and ultra-thin batteries.
Example four:
the synthesis of the solid-state lithium battery comprises the following steps: the method comprises the following steps: laminating and assembling the obtained lithium iron phosphate composite positive plate, a polyoxyethylene-based lithium ion conductor solid electrolyte and a graphite composite negative plate to obtain a solid lithium battery;
step two: the obtained solid lithium battery is subjected to charge-discharge cycle test under the conditions of 60 ℃, 0.3C charge-discharge and charge-discharge cutoff voltage of 2.8V-3.7V, and the result shows that the first discharge specific capacity is 130mAh/g, and the capacity retention rate is 88% after 400 weeks of cycle.
A preparation method of a graphite composite negative plate comprises the following steps: the method comprises the following steps: mixing a graphite material and a conductive agent according to a mass ratio of 88: 3 blending in a blender;
step two: mixing the mixed powder and the binder according to a mass ratio of 86: 4 to obtain 1.35kg of a mixture, uniformly dispersed in 1.69kg of an N-methylpyrrolidone solution, and then injected with 1.5kg of a complex electrolyte formed of polyethylene oxide and a lithium salt, wherein the weight ratio of polyethylene oxide: lithium salt: the mass ratio of the N-methylpyrrolidone solution is 2:1: 10;
step three: fully and uniformly stirring the mixture by using a vacuum planetary stirrer to obtain the stoneCoating the composite negative electrode slurry on a carbon-coated copper foil with the thickness of 10 mu m by using a coating machine, wherein the coating thickness is 110 mu m, drying the wound pole piece in a vacuum baking oven at 105 ℃ for 24h, and rolling the dried pole piece (the compaction is controlled to be 1.2-1.7 mg/cm)3) And slitting to obtain the composite negative plate.
The graphite material comprises natural graphite, artificial graphite and natural-artificial mixed graphite.
The conductive agent comprises Surpe-P, acetylene black, KS-6, CNT, graphene and Ketjen black.
The lithium salt comprises LiTFSI and LiClO4，LiBF4，LiPF6，LiAsF6。
A preparation method of a lithium iron phosphate composite positive plate comprises the following steps: the method comprises the following steps: according to the mass ratio of lithium iron phosphate, a conductive agent, polyvinylidene fluoride, polyoxyethylene and lithium salt to be 80: 5: 3: 7.4: 4.6 to 1kg of mixture;
step two: dispersing the mixture obtained in the step one in 1.5kg of N-methyl pyrrolidone solution, and fully and uniformly stirring by using a vacuum planetary stirrer to obtain a lithium iron phosphate composite anode material;
step three: coating the positive electrode slurry on a carbon-coated aluminum foil with the thickness of 16 mu m by a coating machine with the coating thickness of 200 mu m, drying the coating machine at the drying temperature of 130 ℃ and the running speed of 300mm/min, drying the wound electrode piece in a vacuum baking oven at the temperature of 105 ℃ for 24h, and rolling the dried electrode piece (the compaction is controlled to be 2.0-2.4 mg/cm)3) And slitting to obtain the lithium iron phosphate composite positive plate.
Compared with the traditional electrolyte lithium ion battery, the all-solid-state lithium battery has the following advantages: 1. the structure of the solid-state lithium battery comprises a positive electrode, an electrolyte and a negative electrode, which are all made of solid-state materials, wherein the solid electrolyte conducts lithium ions, and meanwhile, the construction process of the battery is greatly simplified;
2. the potential safety hazards of corrosion and leakage of the electrolyte are completely eliminated, the thermal stability is higher, the battery shell and the cooling system module can be simplified, the weight of the battery is reduced, and the energy density is improved;
3. liquid does not need to be packaged, serial overlapping arrangement and a bipolar mechanism are supported, invalid space in the battery pack can be reduced, and production efficiency is improved;
4. due to the solid-state characteristic of the solid electrolyte, a plurality of electrodes can be superposed, so that the preparation of 12V and 24V high-voltage single batteries in series in a unit becomes possible;
5. the electrochemical stability window is wide (can reach more than 5V), can match with high-voltage electrode materials, and further improves the energy density and the power density;
6. the solid electrolyte is generally a single ion conductor, and almost has no side reaction, so that the service life of the solid electrolyte can be longer, and the unique advantages of the solid lithium battery enable the solid lithium battery to have considerable potential in the fields of large batteries and ultra-thin batteries.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (4)

1. A method for synthesizing a solid-state lithium battery is characterized by comprising the following steps: the synthesis method of the solid-state lithium battery comprises the following steps:
the method comprises the following steps: laminating and assembling a lithium iron phosphate composite positive plate, a polyoxyethylene-based lithium ion conductor solid electrolyte and a graphite composite negative plate to obtain a solid lithium battery;
step two: the obtained solid lithium battery is subjected to charge-discharge cycle test under the conditions of charge-discharge at 60 ℃, 0.3C and charge-discharge cutoff voltage of 2.8V-3.7V, and the result shows that the first discharge specific capacity is 130-144mAh/g, and after 400 cycles, the capacity retention rate is 93-88%;
the preparation steps of the graphite composite negative plate are as follows:
the method comprises the following steps: the graphite material and the conductive agent are mixed according to the mass ratio of 73-88: 3 blending in a blender;
step two: mixing the mixed powder and the binder according to the mass ratio of 76-86: 4 to obtain 1.2 to 1.35kg of a mixture, uniformly dispersing the mixture in 1.5 to 1.69kg of an N-methylpyrrolidone solution, and then injecting 1.23 to 1.5kg of a complex electrolyte formed by polyethylene oxide and a lithium salt, wherein the weight ratio of polyethylene oxide: lithium salt: the mass ratio of the N-methylpyrrolidone solution is 2:1: 10;
step three: stirring thoroughly with vacuum planetary stirrer to obtain graphite composite negative electrode slurry, coating the composite negative electrode slurry on carbon-coated copper foil with thickness of 10 μm with coating machine to coat thickness of 110 μm, drying the wound electrode sheet in vacuum oven at 105 deg.C for 24 hr, rolling the dried electrode sheet, and compacting to 1.2-1.7mg/cm3Cutting to obtain a graphite composite negative plate;
the preparation steps of the lithium iron phosphate composite positive plate are as follows:
the method comprises the following steps: according to the mass ratio of lithium iron phosphate, a conductive agent, polyvinylidene fluoride, polyoxyethylene and lithium salt to be 80: 5: 3: 7.4: 4.6 to 1kg of mixture;
step two: dispersing the mixture obtained in the step one in 1.5kg of N-methyl pyrrolidone solution, and fully and uniformly stirring by using a vacuum planetary stirrer to obtain a lithium iron phosphate composite anode material;
step three: coating the positive electrode slurry on a carbon-coated aluminum foil with the thickness of 16 mu m by a coating machine, wherein the coating thickness is 200 mu m, the drying temperature of the coating machine is 130 ℃, the running speed is 300mm/min, the wound pole piece is dried in a vacuum baking oven at 105 ℃ for 24h, the dried pole piece is rolled, and the compaction is controlled to be 2.0-2.4mg/cm3And slitting to obtain the lithium iron phosphate composite positive plate.
2. The method of claim 1, wherein the step of synthesizing a lithium solid state battery comprises: the graphite material comprises natural graphite, artificial graphite and natural-artificial mixed graphite.
3. The method of claim 1, wherein the step of synthesizing a lithium solid state battery comprises: the conductive agent comprises Surpe-P, acetylene black, KS-6, CNT, graphene and Ketjen black.
4. The method of claim 1, wherein the step of synthesizing a lithium solid state battery comprises: the lithium salt comprises LiTFSI and LiClO4，LiBF4，LiPF6，LiAsF6。
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