High-temperature-resistant polymer lithium battery composition and preparation method thereof

Abstract

The invention relates to the technical field of high-temperature-resistant polymer lithium battery compositions, in particular to a high-temperature-resistant polymer lithium battery composition which comprises the following components: an electrolyte, an anode, a cathode, 1-9% of electrolyte and an isolating membrane, the electrolyte comprises a polymer electrolyte, a solid electrolyte and an electrolyte additive; the polymer electrolyte comprises polymethacrylate, polyethylene oxide, polyvinyl fluoride and polyacrylonitrile; the solid electrolyte is lithium iron phosphate or sulfide and lithium salt, the dosage of the lithium salt is 0.1-2.5 mol / L, and the electrolyte additive comprises fluoroethylene carbonate and vinylene carbonate; the polymer-based electrolyte and the electrolyte are arranged to ensure that the lithium battery composition keeps chemical stability at a high temperature and improve the safety of the battery, and the diaphragm made of the ceramic or polymer mixed coating diaphragm material divides the cathode and the anode, so that short circuit during use of the polymer lithium battery composition is avoided, and meanwhile, the high temperature resistance is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high temperature resistant polymer lithium battery compositions, and in particular to a high temperature resistant polymer lithium battery composition and a preparation method thereof. Background Art

[0002] When preparing polymer lithium batteries, most of them are made of lithium metal or lithium alloy as the anode and cathode materials, polymer electrolyte, diaphragm and other structures. Compared with ordinary lithium batteries, polymer lithium batteries are harder in size, have larger capacity, are safer, and have a lower risk of explosion.

[0003] During the use of existing polymer lithium battery compositions, the battery load power may be too large due to the influence of the external environment, which may cause the polymer lithium battery temperature to be too high, resulting in unstable chemical properties of the polymer lithium battery and affecting the use effect.

[0004] Therefore, in order to solve the problem that the temperature of the polymer lithium battery is too high, which makes the chemical properties of the polymer lithium battery unstable and affects the use effect, a high temperature resistant polymer lithium battery composition and its preparation method can be designed. Summary of the invention

[0005] In order to overcome the problem that the temperature of polymer lithium batteries is too high, which makes the chemical properties of polymer lithium batteries unstable and affects the use effect.

[0006] The technical solution of the present invention is: a high temperature resistant polymer lithium battery composition, comprising the following components: an electrolyte, an anode, a cathode, an electrolyte 1% to 9% and a separator; the electrolyte comprises a polymer electrolyte, a solid electrolyte and an electrolyte additive, the polymer electrolyte comprises polymethacrylate, polyethylene oxide, polyvinyl fluoride, polyacrylonitrile; the solid electrolyte is lithium iron phosphate or sulfide, lithium salt, and the amount of lithium salt is 0.1 to 2.5 mol / L, and the electrolyte additive comprises fluoroethylene carbonate and vinylene carbonate.

[0007] Preferably, the anode includes an anode material, 60% to 80% of a binder and 1% to 10% of a conductive agent, and the anode material is lithium cobalt oxide, lithium nickel cobalt manganese oxide, a silicon-based alloy, graphene, fluoroethylene carbonate or vinylene carbonate.

[0008] Preferably, the binder includes sodium carboxycellulose and styrene-butadiene rubber, and the conductive agent is conductive carbon black, conductive graphite, carbon fiber or graphene.

[0009] Preferably, the cathode includes a cathode material, a modifier and a stabilizer, and the cathode material is artificial graphite, lithium titanate, nickel cobalt aluminum oxide, nickel cobalt manganese oxide or lithium cobalt oxide.

[0010] Preferably, the stabilizer and modifier include carbon nanotubes and carbon black.

[0011] Preferably, the electrolyte is an organic solvent, an electrolyte lithium salt, a fluorine-containing compound or a polymer-based electrolyte. The polymer-based electrolyte includes polyethylene oxide, polyvinyl fluoride and the like.

[0012] Preferably, the isolation membrane is made of ceramic or polymer mixed coating membrane.

[0013] A method for preparing a high temperature resistant polymer lithium battery composition includes the following steps: The first step is to prepare the anode material: select anode materials such as lithium nickel cobalt manganese oxide and silicon-based alloy, mix the anode material with 1% to 10% of the conductive agent and 60% to 80% of the binder, add an appropriate amount of solvent and stir to make a slurry; evenly coat the stirred slurry on the copper foil or aluminum foil through a coating machine, dry it, and obtain the anode sheet after drying; The second step is the preparation of cathode materials: selecting cathode materials such as graphite and lithium titanate, mixing the cathode materials with modifiers and stabilizers, adding an appropriate amount of solvent and stirring to form a slurry; coating the stirred slurry evenly on copper foil or aluminum foil through a coating machine, drying it, and obtaining an anode sheet after drying; The third step is the preparation of electrolyte: polyethylene oxide, polyvinyl fluoride and other materials are selected and dissolved in dimethyl sulfoxide and N-methylpyrrolidone solution, and electrolyte salt is added and heated and stirred. The dissolved mixed solution is coated on a glass plate, and the solution is formed into an electrolyte membrane through heat treatment.

[0014] The fourth step is to compact the cathode and anode electrode sheets after drying. During the compaction process, the electrolyte membrane is covered on the surface of the cathode and anode electrode sheets, and the electrode sheets and electrolyte membrane are cut according to size; The fifth step is to stack or wind the cathode and anode plates and separators into a cylindrical battery core in the order of anode-separator-cathode, inject the electrolyte into the battery core, put the battery core after the electrolyte injection into the battery casing, and use heat sealing or laser welding technology to seal the lithium battery.

[0015] Beneficial effects of the present invention: The setting of polymer-based electrolytes and electrolytes ensures that the lithium battery composition maintains chemical stability at high temperatures and improves the safety of the battery. Materials such as lithium nickel cobalt manganese oxide and silicon-based alloys are used as anode materials to ensure that the polymer lithium battery maintains stable electrochemical properties at high temperatures. At the same time, materials such as graphite and lithium titanate are used as cathode materials to further improve the cycle stability and high-temperature performance of the polymer lithium battery pack during use. The diaphragm made of ceramic or polymer mixed coating material separates the positive and negative poles to avoid short circuits when the polymer lithium battery composition is used, while improving high temperature resistance. Conductive agents and binders ensure that the conductivity and adhesion of the electrode materials are not affected at high temperatures. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the embodiments.

[0017] Example 1 The present invention provides an embodiment: a high temperature resistant polymer lithium battery composition, comprising the following components: an electrolyte, an anode, a cathode, an electrolyte 1% and an isolation membrane; the electrolyte comprises a polymer electrolyte, a solid electrolyte and an electrolyte additive, the polymer electrolyte comprises polymethacrylate, polyethylene oxide, polyvinyl fluoride, and polyacrylonitrile; the solid electrolyte is lithium iron phosphate or sulfide, lithium salt, and the lithium salt dosage is 0.1 mol / L, the electrolyte additive comprises fluoroethylene carbonate, vinylene carbonate, the anode comprises an anode material, a binder 60% and a conductive agent 1%, the anode material is cobalt acid, the binder comprises sodium carboxycellulose and styrene-butadiene rubber, the conductive agent is conductive carbon black, the cathode comprises a cathode material and a modifier and a stabilizer, the cathode material is lithium titanate, the stabilizer and modifier comprise carbon nanotubes and carbon black, the electrolyte is an electrolyte lithium salt, and the isolation membrane material is ceramic.

[0018] A method for preparing a high temperature resistant polymer lithium battery composition includes the following steps: The first step is to prepare the anode material: select cobalt acid, mix the cobalt acid with 1% of the conductive agent and 60% of the binder, add an appropriate amount of solvent and stir to make a slurry; evenly coat the stirred slurry on the copper foil through a coating machine, dry it, and obtain the anode sheet after drying; The second step is to prepare the cathode material: lithium titanate is selected, and lithium titanate is mixed with a modifier and a stabilizer, and a proper amount of solvent is added for stirring to form a slurry; the stirred slurry is evenly coated on a copper foil or an aluminum foil by a coating machine, and dried to obtain an anode sheet after drying; The third step is the preparation of electrolyte: select electrolyte lithium salt and dissolve it in dimethyl sulfoxide solution, add electrolyte salt and heat and stir at the same time, apply the dissolved mixed solution on the glass plate, and form an electrolyte membrane through heat treatment.

[0019] The fourth step is to compact the cathode and anode electrode sheets after drying. During the compaction process, the electrolyte membrane is covered on the surface of the cathode and anode electrode sheets, and the electrode sheets and electrolyte membrane are cut according to size; The fifth step is to stack or wind the cathode and anode plates and separators into a cylindrical battery core in the order of anode-separator-cathode, inject the electrolyte into the battery core, put the battery core after the electrolyte injection into the battery casing, and use heat sealing or laser welding technology to seal the lithium battery.

[0020] Example 2 The present invention provides an embodiment: a high temperature resistant polymer lithium battery composition, comprising the following components: an electrolyte, an anode, a cathode, an electrolyte 9% and a separator; the electrolyte comprises a polymer electrolyte, a solid electrolyte and an electrolyte additive, the polymer electrolyte comprises polymethacrylate, polyethylene oxide, polyvinyl fluoride and polyacrylonitrile; the solid electrolyte is lithium iron phosphate or sulfide, lithium salt, and the lithium salt dosage is 2.5 mol / L, the electrolyte additive comprises fluoroethylene carbonate and vinylene carbonate, the anode comprises an anode material, a binder 80% and a conductive agent 10%, the anode material is vinylene carbonate, the binder comprises sodium carboxycellulose and styrene-butadiene rubber, the conductive agent is graphene, the cathode comprises a cathode material and a modifier and a stabilizer, the cathode material is lithium cobalt oxide, the stabilizer and the modifier comprise carbon nanotubes and carbon black, the electrolyte is a polymer-based electrolyte, and the separator material is a polymer mixed coating separator.

[0021] A method for preparing a high temperature resistant polymer lithium battery composition includes the following steps: The first step is to prepare the anode material: vinylene carbonate is selected, and vinylene carbonate is mixed with 10% of a conductive agent and 80% of a binder, and a proper amount of solvent is added for stirring to prepare a slurry; the stirred slurry is evenly coated on a copper foil by a coating machine, and dried to obtain an anode sheet after drying; The second step is to prepare the cathode material: select lithium cobalt oxide, mix the lithium cobalt oxide with a modifier and a stabilizer, add an appropriate amount of solvent and stir to make a slurry; evenly coat the stirred slurry on the copper foil through a coating machine, dry it, and obtain the anode sheet after drying; The third step is the preparation of electrolyte: select a polymer-based electrolyte and dissolve it in N-methylpyrrolidone solution. At the same time, add electrolyte salt and heat and stir. The dissolved mixed solution is coated on a glass plate and the solution is formed into an electrolyte membrane through heat treatment.

[0022] The fourth step is to compact the cathode and anode electrode sheets after drying. During the compaction process, the electrolyte membrane is covered on the surface of the cathode and anode electrode sheets, and the electrode sheets and electrolyte membrane are cut according to size; The fifth step is to stack or wind the cathode and anode plates and separators into a cylindrical battery core in the order of anode-separator-cathode, inject the electrolyte into the battery core, put the battery core after the electrolyte injection into the battery casing, and use heat sealing or laser welding technology to seal the lithium battery.

[0023] The embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A high temperature resistant polymer lithium battery composition, characterized in that: It includes the following components: electrolyte, anode, cathode, electrolyte 1% to 9% and separator; The electrolyte includes polymer electrolyte, solid electrolyte and electrolyte additive, and the polymer electrolyte includes polymethacrylate, polyethylene oxide, polyvinyl fluoride and polyacrylonitrile; The solid electrolyte is lithium iron phosphate or sulfide, lithium salt, and the amount of lithium salt is 0.1-2.5 mol / L. The electrolyte additives include fluoroethylene carbonate and vinylene carbonate.

2. The high temperature resistant polymer lithium battery composition according to claim 1, characterized in that: The anode includes an anode material, 60% to 80% of a binder and 1% to 10% of a conductive agent. The anode material is lithium cobalt oxide, lithium nickel cobalt manganese oxide, a silicon-based alloy, graphene, fluoroethylene carbonate or vinylene carbonate.

3. The high temperature resistant polymer lithium battery composition according to claim 2, characterized in that: The binder includes sodium carboxycellulose and styrene-butadiene rubber, and the conductive agent is conductive carbon black, conductive graphite, carbon fiber or graphene.

4. The high temperature resistant polymer lithium battery composition according to claim 1, characterized in that: The cathode includes cathode material, a modifier and a stabilizer. The cathode material is artificial graphite, lithium titanate, nickel cobalt aluminum oxide, nickel cobalt manganese oxide or lithium cobalt oxide.

5. The high temperature resistant polymer lithium battery composition according to claim 4, characterized in that: Stabilizers and modifiers include carbon nanotubes and carbon black.

6. The high temperature resistant polymer lithium battery composition according to claim 1, characterized in that: The electrolyte is an organic solvent, an electrolyte lithium salt, a fluorine-containing compound or a polymer-based electrolyte. The polymer-based electrolyte includes polyethylene oxide, polyvinyl fluoride and the like.

7. The high temperature resistant polymer lithium battery composition according to claim 1, characterized in that: The isolating membrane is made of ceramic or polymer mixed coating membrane.

8. A method for preparing a high temperature resistant polymer lithium battery composition, characterized in that: The method comprises the following steps: The first step is to prepare the anode material: select anode materials such as lithium nickel cobalt manganese oxide and silicon-based alloy, mix the anode material with 1% to 10% of the conductive agent and 60% to 80% of the binder, add an appropriate amount of solvent and stir to make a slurry; evenly coat the stirred slurry on the copper foil or aluminum foil through a coating machine, dry it, and obtain the anode sheet after drying; The second step is the preparation of cathode materials: selecting cathode materials such as graphite and lithium titanate, mixing the cathode materials with modifiers and stabilizers, adding an appropriate amount of solvent and stirring to form a slurry; coating the stirred slurry evenly on copper foil or aluminum foil through a coating machine, drying it, and obtaining an anode sheet after drying; The third step is to prepare the electrolyte: select polyethylene oxide, polyvinyl fluoride and other materials and dissolve them in dimethyl sulfoxide and N-methylpyrrolidone solution, add electrolyte salt, heat and stir, and apply the dissolved mixed solution on the glass plate, and form the electrolyte membrane through heat treatment; The fourth step is to compact the cathode and anode electrode sheets after drying. During the compaction process, the electrolyte membrane covers the surface of the cathode and anode electrode sheets, and the electrode sheets and electrolyte membrane are cut according to size; The fifth step is to stack or wind the cathode and anode plates and separators into a cylindrical battery core in the order of anode-separator-cathode, inject the electrolyte into the battery core, put the battery core after the electrolyte injection into the battery casing, and use heat sealing or laser welding technology to seal the lithium battery.