CN100359727C - Method for manufacturing active matter carrier for lithium cell and its assembled cell - Google Patents
Method for manufacturing active matter carrier for lithium cell and its assembled cell Download PDFInfo
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- CN100359727C CN100359727C CNB031445187A CN03144518A CN100359727C CN 100359727 C CN100359727 C CN 100359727C CN B031445187 A CNB031445187 A CN B031445187A CN 03144518 A CN03144518 A CN 03144518A CN 100359727 C CN100359727 C CN 100359727C
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Abstract
The present invention discloses a method for preparing active substance carriers in lithium batteries and an assembled battery. The present invention aims to provide a method for preparing active substance carriers in lithium ion batteries, which can enhance the production efficiency of the forming technology for active substance carriers in lithium batteries and has the advantage of simple process control, and an assembled lithium battery. Anode active substances or cathode active substances capable of providing energy, an electricity conductive additive, ultrahigh molecular weight polyethylene and solvent used for dissolving the ultrahigh molecular weight polyethylene are uniformly mixed at high temperature, and after being cooled and pulverized, the mixture is extruded into sheet material by an extruder. Metal base material is pressed in a hot mode between two layers of the sheet material to form the active substance carriers in lithium batteries. The anode active substance carriers, the cathode active substance carriers and a barrier film are rolled or laminated to form an electric core, and the electric core is processed into the lithium battery with certain energy through the procedures of extraction, casing installation, drying, liquid injection and formation.
Description
Technical field
The present invention relates to a kind of battery and manufacture method, in particular, relate to a kind of lithium battery and the wherein manufacture method of active ingredient carriers and the battery that is assembled into.
Background technology
Lithium battery is the very high broad-spectrum battery of new generation of current scientific and technological content.Its volumetric specific energy, specific energy height can fill and pollution-free, have possessed three big advantages of current battery industry development, are referred to as by people by " the most promising chemical power source ".Lithium battery is mainly used in aspects such as notebook computer, numerical digit modem, mobile phone, Video Camera, digital camera, miniature light disc player, Handy Terminal, and high-capacity lithium battery then is mainly used in aspects such as electric bicycle, electric automobile, family's redundant electrical power.
At present, in the production technology of lithium battery, form slurry after normally negative or positive electrode active material, conductive additive, binding agent being stirred in solvent with certain viscosity.Resulting slurry is applied one deck active material by modes such as roller coat, blade coatings on metallic foil substrates.The sheet material that is loaded with the negative or positive electrode active material after the moulding forms the carrier of the negative or positive electrode active material of lithium battery after rolling, cutting.For example the patent No. is 00227555.4, and it is described that name is called " thin lithium ion battery ", cobalt acid lithium, conductive agent, binding agent is dissolved in organic solvent, and stir the anode sizing agent that can apply to form.This anode sizing agent is being loaded on the doctor knife coater on the metal forming Al, forming the positive active material carrier through super-dry, shearing.And the technology that the negative electrode active material carrier is adopted is also similar.Usually the operation that contains a solvent evaporation in the technical process, this operation cause the production efficiency of lithium battery positive pole active substance carrier, negative electrode active material carrier low, and the THICKNESS CONTROL difficulty of carrier is big.
Summary of the invention
The present invention is in order to overcome weak point of the prior art, and the manufacture method of active ingredient carriers in a kind of simple lithium ion battery of production efficiency, process control that can improve lithium battery active ingredient carriers moulding process and the lithium battery that is assembled into are provided.
The present invention is achieved through the following technical solutions:
The manufacture method of active ingredient carriers comprises the steps: in a kind of lithium battery
(1) the positive active material that energy can be provided or negative electrode active material and conductive additive, ultra-high molecular weight polyethylene, mixes at 100 ~ 220 ℃ in order to the solvent of dissolving ultra-high molecular weight polyethylene, after cooling, the pulverizing, be extruded into sheet material through extruder;
(2) after above-mentioned two-layer load of extruding has the sheet material intermediate heat of positive active material or negative electrode active material to press metal base, promptly form the active ingredient carriers in the lithium battery;
The mass percent that contains each component in the mixture of positive active material is:
Positive active material: conductive agent: ultra-high molecular weight polyethylene=55～94: 5～1: 40～5;
The mass percent that contains each component in the mixture of negative electrode active material is:
Negative electrode active material: conductive agent: ultra-high molecular weight polyethylene=55～95: 5～0: 40～5;
The solvent of described dissolving ultra-high molecular weight polyethylene and the ratio of ultra-high molecular weight polyethylene are 0.1: 1～100: 1;
The molecular weight of described ultra-high molecular weight polyethylene is at least 1,500,000.
Described positive active material is LiCoO
2, LiNi
xCo
1-xO
2, LiMn
2O
4, LiFePO
4In at least a.
Described negative electrode active material is at least a in native graphite, mesophase pitch base carbon bead, mesophase pitch-based carbon fibers, the coke.
The solvent of described dissolving ultra-high molecular weight polyethylene is one or both the mixture in paraffin oil, the naphthalane.
Described metal base is any in Copper Foil, copper mesh, aluminium foil, aluminium net, the nickel screen.
A kind of lithium battery comprises shell, is provided with electric core in the described shell, and described electric core comprises by the positive active material carrier of method for preparing and negative electrode active material carrier, separates the barrier film of both positive and negative polarity carrier, is provided with electrolyte in the described electric core.
Described barrier film is any in PE individual layer perforated membrane, three layers of perforated membrane of PP/PE/PP, PP individual layer perforated membrane, the PVDF perforated membrane.
Described electrolyte is the mixture of nonaqueous solvents and conducting salt.
Described nonaqueous solvents is at least a among EC, DEC, DMC, EMC, the VC; Described conducting salt is LiPF
6, LiAsF
6, LiClO
4, LiCF
3SO
3In at least a.
The positive active material that energy can be provided or negative electrode active material, conductive additive, ultra-high molecular weight polyethylene, at high temperature mix in order to the solvent of dissolving ultra-high molecular weight polyethylene, cooling is pulverized after extruder is extruded into sheet material.After pressing metal base, the two sheets intermediate heat forms the active ingredient carriers in the lithium battery.Positive active material carrier, negative electrode active material carrier, barrier film form electric core behind coiling or lamination, formation has the lithium battery of certain energy behind the extraction of electric core process, dress shell, drying, fluid injection, the formation process.
The present invention has following beneficial effect:
The present invention owing to adopt the method for extrusion molding, makes that the control of active ingredient carriers moulding is simple in the lithium battery when preparation lithium battery active ingredient carriers.And there are not the operation of solvent evaporation, production efficiency height in the technical process.
Embodiment
The invention will be further described below in conjunction with specific embodiment.
The manufacture method of lithium battery active ingredient carriers disclosed in this invention, the negative or positive electrode active material that energy can be provided, conductive additive, ultra-high molecular weight polyethylene, at high temperature mix in order to the solvent of dissolving ultra-high molecular weight polyethylene, cooling is pulverized after extruder is extruded into sheet material.After pressing metal base, the intermediate heat of two sheets forms the active ingredient carriers in the lithium battery.
Described positive active material comprises LiCoO
2, LiNi
xCo
1-xO
2, LiMn
2O
4, LiFePO
4Deng at least a material in the material, or two kinds and two or more mixtures in them.Ultra-high molecular weight polyethylene, its molecular weight will surpass 1,500,000 at least.The solvent of superhigh molecular weight polyethylene material can be at high temperature dissolved in adding, is preferably at least a in paraffin oil, two kinds of materials of naphthalane or the mixture between them.Usually can select acetylene black, conductive carbon black, graphite as conductive additive.The scope that proportioning in the mixture between the various materials can change is: positive active material: conductive agent: ultra-high molecular weight polyethylene=55～94: 5～1: 40～5.Wherein the mass percent of ultra-high molecular weight polyethylene surpasses 40%, then because the few and feasible lithium battery energy density minimizing of assembling of positive active material in the active ingredient carriers; When the mass percent of ultra-high molecular weight polyethylene is lower than 5%, then since in the active ingredient carriers superhigh molecular weight polyethylene material reduce, make the active ingredient carriers processability weaken greatly.Toward the solvent that wherein adds the dissolving ultra-high molecular weight polyethylene, solvent and ultra-high molecular weight polyethylene ratio are 0.1: 1～100: 1 then.
Mixture high temperature mixed process according to said ratio comprises by machineries such as banbury, plasticator, double screw extruder, reciprocating type single screw extrusion machines and being undertaken.Preferentially choose banbury and plasticator and carry out mixing between the various raw material.And mixture cools off and pulverizes back extrusion sheet in extruder through mixing, and extruder comprises single screw extrusion machine, double screw extruder.Extrude the sheet material that has active material through extruder, can be distracted into coiled material after felt wrapped roll press polish, cooling, also can become to have the sheet material size of certain size by automatic cutting, the thickness of sheet material can change between 0.1 ~ 1mm easily.In the middle of two sheet materials after extruding, put into metal base, metal base is any in Copper Foil, copper mesh, aluminium foil, aluminium net, the nickel screen, preferentially choose the metallic aluminium net, introduce in two sheet materials, form the positive active material carrier of lithium battery through making metal base behind the elevated temperature heat pressure roller.The introducing of metal base can be carried out continuously, also can be interrupted and carry out.
Described negative electrode active material comprises at least a material in the materials such as native graphite, MCMB (mesophase pitch base carbon bead), MPCF (mesophase pitch-based carbon fibers), coke, or two kinds and two or more mixtures in them.Ultra-high molecular weight polyethylene, its molecular weight will surpass 1,500,000 at least.The solvent of superhigh molecular weight polyethylene material can be at high temperature dissolved in adding, is preferably at least a in paraffin oil, two kinds of materials of naphthalane or the mixture between them.Described conductive additive can exist also in the negative electrode active material carrier and can not exist, and these additives can be selected in the materials such as acetylene black, conductive carbon black, graphite a kind of.The scope that proportioning in the mixture between the various materials can change is: negative electrode active material: conductive agent: ultra-high molecular weight polyethylene=55～95: 5～0: 40～5.Wherein the mass percent of ultra-high molecular weight polyethylene surpasses 40%, then because the feasible less lithium battery energy density minimizing of being assembled of negative electrode active material in the active ingredient carriers, and the mass percent of working as ultra-high molecular weight polyethylene is lower than 5%, then because superhigh molecular weight polyethylene material minimizing in the active ingredient carriers makes the active ingredient carriers processability weaken greatly.Toward wherein adding the solvent that can at high temperature dissolve superhigh molecular weight polyethylene material, solvent and ultra-high molecular weight polyethylene ratio are 0.1: 1～100: 1 then.
Mixture high temperature mixed process according to said ratio comprises by machineries such as banbury, plasticator, double screw extruder, reciprocating type single screw extrusion machines and being undertaken.Preferentially choose banbury and plasticator and carry out mixing between the various raw material.And mixture cools off and pulverizes back extrusion sheet in extruder through mixing, and extruder comprises single screw extrusion machine, double screw extruder.Extrude the sheet material that has active material through extruder, can be distracted into coiled material after felt wrapped roll press polish, cooling, also can become to have the sheet material size of certain size by automatic cutting, the thickness of sheet material can change between 0.1 ~ 1mm easily.In the middle of two sheet materials after extruding, put into metal base, metal base is any in Copper Foil, copper mesh, aluminium foil, aluminium net, the nickel screen, preferentially choose the metal copper mesh, introduce in two sheet materials, form the negative electrode active material carrier of lithium battery through making metal base behind the elevated temperature heat pressure roller.The introducing of metal base can be carried out continuously, also can be interrupted and carry out.
Around together, also can form lithium battery electric core to the membrane coil of positive active material carrier, negative electrode active material carrier, separation both positive and negative polarity carrier according to the lamination mode.Employed barrier film can comprise in PE individual layer perforated membrane, three layers of perforated membrane of PP/PE/PP, PP individual layer perforated membrane, the PVDF porous film material a kind of.For the non-active solvent that exists in the electric core is removed, can use a kind of in carrene, the chloroform equal solvent, or the mixture among them, carry out extraction process and obtain.
Through the electric core of the removing non-active solvent electric core housing of packing into, it can be that stainless steel casing, nickel plating box hat, metal aluminum hull and plastic-aluminum flexible packing shell etc. are wherein a kind of.After electric core carried out drying, toward wherein injecting electrolyte.Electrolyte is the mixture of nonaqueous solvents and conducting salt.Nonaqueous solvents comprises a kind of among EC, DEC, DMC, EMC, the VC or two kinds and two or more mixture in them.And conducting salt comprises LiPF
6, LiAsF
6, LiClO
4, LiCF
3SO
3In a kind of, or their in the middle of two kinds and two or more mixture.The good electric core of fluid injection can form the lithium battery with a constant volume through operation such as changing into after encapsulation.
The preparation of positive active material
Embodiment 1:
Positive active material is selected LiCoO for use
2Material, ultra-high molecular weight polyethylene, its molecular weight are 3,500,000.Conductive additive is graphite and acetylene black mixture, and its ratio is 2: 1.Proportioning in the mixture between the various materials is: LiCoO
2Positive active material: conductive mixture: ultra-high molecular weight polyethylene=87: 3: 10.Be paraffin oil toward wherein adding the solvent that can at high temperature dissolve superhigh molecular weight polyethylene material then.Paraffin oil and ultra-high molecular weight polyethylene ratio are 5: 1.
The high temperature mixing is carried out under 170 ℃ of temperature by banbury, and the mixture cooling is pulverized after single screw extrusion machine is extruded into sheet material then, and the THICKNESS CONTROL of sheet material is at 0.1mm after felt wrapped roll press polish, traction.Cut into sheet material, and in the middle of such two sheet materials, put into the metallic aluminium net, through forming the positive active material carrier of lithium battery behind 130 ℃ of hot pressing rollers of high temperature with certain specification size.
Embodiment 2
Positive active material is selected LiNi for use
xCo
1-xO
2Material, ultra-high molecular weight polyethylene, its molecular weight are 2,500,000.Conductive additive is an acetylene black, and the proportioning in the mixture between the various materials is: LiCoO
2Positive active material: acetylene black: ultra-high molecular weight polyethylene=85: 5: 10.Be naphthalane toward wherein adding the solvent that can at high temperature dissolve superhigh molecular weight polyethylene material then.Naphthalane and ultra-high molecular weight polyethylene ratio are 4: 1.
The high temperature mixing is carried out under 220 ℃ of temperature by banbury, and the mixture cooling is pulverized after single screw extrusion machine is extruded into sheet material then, and the THICKNESS CONTROL of sheet material is below 0.1mm after felt wrapped roll press polish, traction.Cut into sheet material, and in the middle of such two sheet materials, put into the metallic aluminium net, through forming the positive active material carrier of lithium battery behind 130 ℃ of hot pressing rollers of high temperature with certain specification size.
Embodiment 3
Positive active material is selected LiMn for use
2O
4Material, ultra-high molecular weight polyethylene, its molecular weight are 3,500,000.Conductive additive is a conductive carbon black.Proportioning in the mixture between the various materials is: LiMnO
2Positive active material: conductive carbon black: ultra-high molecular weight polyethylene=88: 3: 9.Toward wherein adding paraffin oil, paraffin oil and ultra-high molecular weight polyethylene ratio are 5: 1 then.
The high temperature mixing is carried out under 170 ℃ of temperature by plasticator, and the mixture cooling is pulverized after double screw extruder is extruded into sheet material then, and the THICKNESS CONTROL of sheet material is at 0.1mm after felt wrapped roll press polish, traction.Cut into sheet material, and in the middle of such two sheet materials, put into metal aluminum foil, through forming the positive active material carrier of lithium battery behind 130 ℃ of hot pressing rollers of high temperature with certain specification size.
Embodiment 4
Positive active material is selected LiFePO for use
4Material, ultra-high molecular weight polyethylene, its molecular weight are 2,500,000.Conductive additive is a graphite, and the proportioning in the mixture between the various materials is: LiFePO
4Positive active material: graphite: ultra-high molecular weight polyethylene=87: 3: 10.Toward wherein adding paraffin oil, paraffin oil and ultra-high molecular weight polyethylene ratio are 5: 1 then.
The high temperature mixing is carried out under 180 ℃ of temperature by banbury, and the mixture cooling is pulverized after reciprocating type single screw extrusion machine is extruded into sheet material then, and the THICKNESS CONTROL of sheet material is at 0.1mm after felt wrapped roll press polish, traction.Cut into sheet material, and in the middle of such two sheet materials, put into metal aluminum foil, through forming the positive active material carrier of lithium battery behind 130 ℃ of hot pressing rollers of high temperature with certain specification size.
Embodiment 5
Positive active material is selected LiCoO for use
2, LiMn
2O
4Material, ultra-high molecular weight polyethylene, its molecular weight are 3,500,000.Adopting conductive additive is graphite and acetylene black mixture.Proportioning in the mixture between the various materials is: LiCoO
2, and Li
3MnO
4Positive active material: conductive mixture: ultra-high molecular weight polyethylene=89: 3: 8.Toward wherein adding paraffin oil, paraffin oil and ultra-high molecular weight polyethylene ratio are 5: 1 then.
The high temperature mixing is carried out under 180 ℃ of temperature by plasticator, and the mixture cooling is pulverized after single screw extrusion machine is extruded into sheet material then, and the THICKNESS CONTROL of sheet material is at 0.1mm after felt wrapped roll press polish, traction.Cut into sheet material, and in the middle of such two sheet materials, put into the aluminium net, through forming the positive active material carrier of lithium battery behind 130 ℃ of hot pressing rollers of high temperature with certain specification size.
Preparation negative electrode active material carrier:
Embodiment 6
Negative electrode active material is selected natural graphite material for use, and ultra-high molecular weight polyethylene, its molecular weight are 2,500,000.Proportioning in the mixture between the various materials is: native graphite: ultra-high molecular weight polyethylene=87: 13.Toward wherein adding paraffin oil, paraffin oil and ultra-high molecular weight polyethylene ratio are 5: 1 then.
The high temperature mixing is carried out under 170 ℃ of temperature by banbury, and the mixture cooling is pulverized and become sheet material through single screw extrusion machine then, and the THICKNESS CONTROL of sheet material is at 0.1mm after felt wrapped roll press polish, traction.Cut into sheet material, and in the middle of such two sheet materials, put into the metal copper mesh, through forming the negative electrode active material carrier of lithium battery behind 130 ℃ of hot pressing rollers of high temperature with certain specification size.
Embodiment 7
Negative electrode active material is selected the MCMB material for use, and ultra-high molecular weight polyethylene, its molecular weight are 3,500,000.Conductive additive is an acetylene black, and the proportioning in the mixture between the various materials is: MCMB negative electrode active material: acetylene black: ultra-high molecular weight polyethylene=87: 13.Be naphthalane toward wherein adding the solvent that can at high temperature dissolve superhigh molecular weight polyethylene material then, naphthalane and ultra-high molecular weight polyethylene ratio are 5: 1.
The high temperature mixing is carried out under 180 ℃ of temperature by plasticator, and the mixture cooling is pulverized and is extruded into sheet material through single screw extrusion machine then, and the THICKNESS CONTROL of sheet material is at 0.1mm after felt wrapped roll press polish, traction.Cut into sheet material, and in the middle of such two sheet materials, put into the metal copper mesh, through forming the negative electrode active material carrier of lithium battery behind 130 ℃ of hot pressing rollers of high temperature with certain specification size.
Embodiment 8
Negative electrode active material is selected the MFPC material for use, and ultra-high molecular weight polyethylene, its molecular weight are 2,500,000.Conductive additive is a conductive carbon black, and the proportioning in the mixture between the various materials is: MFPC negative electrode active material: conductive carbon black: ultra-high molecular weight polyethylene=87: 13.Be the mixture of paraffin oil and naphthalane toward wherein adding the solvent that can at high temperature dissolve superhigh molecular weight polyethylene material then, the ratio of paraffin oil and naphthalane is 2: 1, and the mixture of paraffin oil and naphthalane and ultra-high molecular weight polyethylene ratio are 5: 1.
The high temperature mixing is carried out under 200 ℃ of temperature by banbury, and the mixture cooling is pulverized and is extruded into sheet material through double screw extruder then, and the THICKNESS CONTROL of sheet material is at 0.1mm after felt wrapped roll press polish, traction.Cut into sheet material, and in the middle of such two sheet materials, put into copper mesh, through forming the negative electrode active material carrier of lithium battery behind 130 ℃ of hot pressing rollers of high temperature with certain specification size.
Embodiment 9
Negative electrode active material is selected the coke material for use, and ultra-high molecular weight polyethylene, its molecular weight are 2,500,000.Conductive additive is a graphite, and the proportioning in the mixture between the various materials is: the negative electrode active material coke: ultra-high molecular weight polyethylene=87: 13.Be paraffin oil toward wherein adding the solvent that can at high temperature dissolve superhigh molecular weight polyethylene material then.Paraffin oil and ultra-high molecular weight polyethylene ratio are 5: 1.
The high temperature mixing is carried out under 200 ℃ of temperature by banbury, and the mixture cooling is pulverized and become sheet material through single screw extrusion machine then, and the THICKNESS CONTROL of sheet material is at 0.15mm after felt wrapped roll press polish, traction.Cut into sheet material, and in the middle of such two sheet materials, put into nickel screen, through forming the negative electrode active material carrier of lithium battery behind 130 ℃ of hot pressing rollers of high temperature with certain specification size.
Embodiment 10
Negative electrode active material is selected the mixture (ratio is 2: 1) of MCMB and MPCF for use, and ultra-high molecular weight polyethylene, its molecular weight are 3,500,000.Proportioning in the mixture between the various materials is: negative electrode active material: ultra-high molecular weight polyethylene=87: 13.Be naphthalane toward wherein adding the solvent that can at high temperature dissolve superhigh molecular weight polyethylene material then, naphthalane and ultra-high molecular weight polyethylene ratio are 5: 1.
The high temperature mixing is carried out under 170 ℃ of temperature by banbury, and the mixture cooling is pulverized and become sheet material through single screw extrusion machine then, and the THICKNESS CONTROL of sheet material is below 0.1mm after felt wrapped roll press polish, traction.Cut into sheet material, and in the middle of such two sheet materials, put into metal copper foil, through forming the negative electrode active material carrier of lithium battery behind 130 ℃ of hot pressing rollers of high temperature with certain specification size.
The preparation of lithium battery:
Embodiment 11
According to embodiment 1 formed positive active material carrier with according to embodiment 6 formed negative electrode active carriers, separate the membrane coil of both positive and negative polarity carrier around forming lithium battery electric core together.Employed barrier film is a PE individual layer perforated membrane.Use the non-active solvent that exists in the dichloromethane extraction power down core.
Through the electric core of the removing non-active solvent electric core housing of packing into, shell is the plastic-aluminum flexible packing material.After electric core carried out drying, toward wherein injecting electrolyte, electrolyte was the mixture of nonaqueous solvents and conducting salt.Nonaqueous solvents consist of EC: DEC: DMC=1: 1: 1, and conducting salt LiPF
6Concentration be 1Mol/l.The good electric core of fluid injection can form the lithium battery with a constant volume through operation such as changing into after encapsulation.
Embodiment 12
According to embodiment 2 formed positive active material carriers with according to embodiment 7 formed negative electrode active carriers, separate the membrane coil of both positive and negative polarity carrier around forming lithium battery electric core together.Employed barrier film is three layers of perforated membrane of PP/PE/PP.Use the non-active solvent that exists in the chloroform extraction power down core.
Through the electric core of the removing non-active solvent electric core housing of packing into, shell is a stainless steel material.After electric core carried out drying, toward wherein injecting electrolyte, electrolyte was the mixture of nonaqueous solvents and conducting salt.Nonaqueous solvents EC: DEC: EMC=1: 1: 1, and conducting salt LiAsF
6Concentration be 1Mol/l.The good electric core of fluid injection can form the lithium battery with a constant volume through operation such as changing into after encapsulation.
Embodiment 13
According to embodiment 3 formed positive active material carriers with according to embodiment 8 formed negative electrode active carriers, separate the membrane coil of both positive and negative polarity carrier around forming lithium battery electric core together.Employed barrier film is a PP individual layer perforated membrane.Use the non-active solvent that exists in mixture (2: 1) the extraction power down core of carrene and chloroform.
Through the electric core of the removing non-active solvent electric core housing of packing into, shell is the nickel plating box hat.After electric core carried out drying, toward wherein injecting electrolyte, electrolyte was the mixture of nonaqueous solvents and conducting salt.Nonaqueous solvents is EC: DEC: DMC: VC=1: 1: 0.8: 0.2, and conducting salt LiClO
4Concentration be 1Mol/l.The good electric core of fluid injection can form the lithium battery with a constant volume through operation such as changing into after encapsulation.
Embodiment 14
According to embodiment 4 formed positive active material carriers with according to embodiment 9 formed negative electrode active carriers, separate the membrane coil of both positive and negative polarity carrier around forming lithium battery electric core together.Employed barrier film is the PVDF perforated membrane.Use the non-active solvent that exists in the dichloromethane extraction power down core.
Through the electric core of the removing non-active solvent electric core housing of packing into, shell is an aluminum hull.After electric core carried out drying, toward wherein injecting electrolyte, electrolyte was the mixture of nonaqueous solvents and conducting salt.Nonaqueous solvents is EC: DEC: EMC=1: 1: 1, and conducting salt LiCF
3SO
3Concentration be 1Mol/l.The good electric core of fluid injection can form the lithium battery with a constant volume through operation such as changing into after encapsulation.
Embodiment 15
According to embodiment 5 formed positive active material carriers with according to embodiment 10 formed negative electrode active carriers, separate the membrane coil of both positive and negative polarity carrier around forming lithium battery electric core together.Employed barrier film is a PF individual layer perforated membrane.Use the non-active solvent that exists in the dichloromethane extraction power down core.
Through the electric core of the removing non-active solvent electric core housing of packing into, shell is the plastic-aluminum flexible packing material.After electric core carried out drying, toward wherein injecting electrolyte, electrolyte was the mixture of nonaqueous solvents and conducting salt.It consists of EC: DEC: DMC=1: 1: 1, and conducting salt LiPF
6With LiAsF
6Mixture, concentration is 1Mol/l.The good electric core of fluid injection can form the lithium battery with a constant volume through operation such as changing into after encapsulation.
Although the disclosed lithium battery that relates to the manufacture method of active ingredient carriers in a kind of lithium battery and be assembled into has been carried out special description with reference to embodiment, but those skilled in the art can understand, under the situation that does not depart from scope and spirit of the present invention, can carry out all conspicuous modification of form and details to it.Therefore, embodiment described above is illustrative and not restrictive, and under the situation that does not break away from the spirit and scope of the present invention, all variations and modification are all within the scope of the present invention.
Claims (9)
1. the manufacture method of active ingredient carriers in the lithium battery is characterized in that, comprises the steps:
(1) the positive active material that energy can be provided or negative electrode active material and conductive additive, ultra-high molecular weight polyethylene, mixes at 100～220 ℃ in order to the solvent of dissolving ultra-high molecular weight polyethylene, after cooling, the pulverizing, be extruded into sheet material through extruder;
(2) after above-mentioned two-layer load of extruding has the sheet material intermediate heat of positive active material or negative electrode active material to press metal base, promptly form the active ingredient carriers in the lithium battery;
The mass percent that contains each component in the mixture of positive active material is:
Positive active material: conductive agent: ultra-high molecular weight polyethylene=55～94: 5～1: 40～5;
The mass percent that contains each component in the mixture of negative electrode active material is:
Negative electrode active material: conductive agent: ultra-high molecular weight polyethylene=55～95: 5～0: 40～5;
The solvent of described dissolving ultra-high molecular weight polyethylene and the ratio of ultra-high molecular weight polyethylene are 0.1: 1～100: 1;
The molecular weight of described ultra-high molecular weight polyethylene is at least 1,500,000.
2. the manufacture method of active ingredient carriers is characterized in that in the lithium battery according to claim 1, and described positive active material is LiCoO
2, LiMn
2O
4, LiFePO
4In at least a.
3. the manufacture method of active ingredient carriers is characterized in that in the lithium battery according to claim 1, and described negative electrode active material is at least a in native graphite, mesophase pitch base carbon bead, mesophase pitch-based carbon fibers, the coke.
4. the manufacture method of active ingredient carriers is characterized in that in the lithium battery according to claim 1, and the solvent of described dissolving ultra-high molecular weight polyethylene is one or both the mixture in paraffin oil, the naphthalane.
5. the manufacture method of active ingredient carriers is characterized in that in the lithium battery according to claim 1, and described metal base is any in Copper Foil, copper mesh, aluminium foil, aluminium net, the nickel screen.
6 one kinds of lithium batteries, comprise shell, it is characterized in that, be provided with electric core in the described shell, described electric core comprises by the positive active material carrier of the described method preparation of in the claim 1 to 5 any one and negative electrode active material carrier, separates the barrier film of both positive and negative polarity carrier, is provided with electrolyte in the described electric core.
7. lithium battery according to claim 6 is characterized in that, described barrier film is any in PE individual layer perforated membrane, three layers of perforated membrane of PP/PE/PP, PP individual layer perforated membrane, the PVDF perforated membrane.
8. lithium battery according to claim 6 is characterized in that, described electrolyte is the mixture of nonaqueous solvents and conducting salt.
9. lithium battery according to claim 8 is characterized in that, described nonaqueous solvents is at least a among EC, DEC, DMC, EMC, the VC; Described conducting salt is LiPF
6, LiAsF
6, LiClO
4, LiCF
3SO
3In at least a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031445187A CN100359727C (en) | 2003-09-29 | 2003-09-29 | Method for manufacturing active matter carrier for lithium cell and its assembled cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031445187A CN100359727C (en) | 2003-09-29 | 2003-09-29 | Method for manufacturing active matter carrier for lithium cell and its assembled cell |
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| Publication Number | Publication Date |
|---|---|
| CN1529372A CN1529372A (en) | 2004-09-15 |
| CN100359727C true CN100359727C (en) | 2008-01-02 |
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| CNB031445187A Expired - Fee Related CN100359727C (en) | 2003-09-29 | 2003-09-29 | Method for manufacturing active matter carrier for lithium cell and its assembled cell |
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| CN102709593A (en) * | 2012-06-06 | 2012-10-03 | 天津力神电池股份有限公司 | Novel lithium-ion power battery |
| CN105702920A (en) * | 2014-11-25 | 2016-06-22 | 江苏永昌新能源科技有限公司 | Aqueous system preparation method of lithium battery positive plate |
Citations (5)
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|---|---|---|---|---|
| JPH06116436A (en) * | 1992-10-02 | 1994-04-26 | Mitsubishi Kasei Corp | Method for treating porous polymer membrane |
| CN1259773A (en) * | 1999-08-14 | 2000-07-12 | 惠州Tcl金能电池有限公司 | Compound polymer dielectric membrane and lithium batttery made by using said membrane |
| CN1348229A (en) * | 2000-10-10 | 2002-05-08 | 肖云升 | Method of raising the capacity of lithium ion battery |
| US6485867B1 (en) * | 2000-10-03 | 2002-11-26 | Daramic, Inc. | Use of lignins in thermoplastics |
| US6586138B2 (en) * | 2000-02-04 | 2003-07-01 | Amtek Research International Llc | Freestanding microporous separator including a gel-forming polymer |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06116436A (en) * | 1992-10-02 | 1994-04-26 | Mitsubishi Kasei Corp | Method for treating porous polymer membrane |
| CN1259773A (en) * | 1999-08-14 | 2000-07-12 | 惠州Tcl金能电池有限公司 | Compound polymer dielectric membrane and lithium batttery made by using said membrane |
| US6586138B2 (en) * | 2000-02-04 | 2003-07-01 | Amtek Research International Llc | Freestanding microporous separator including a gel-forming polymer |
| US6485867B1 (en) * | 2000-10-03 | 2002-11-26 | Daramic, Inc. | Use of lignins in thermoplastics |
| CN1348229A (en) * | 2000-10-10 | 2002-05-08 | 肖云升 | Method of raising the capacity of lithium ion battery |
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| CN1529372A (en) | 2004-09-15 |
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Assignee: Hubei Wewin Battery Technology Co., Ltd. Assignor: Tianjin University Contract fulfillment period: 2008.12.20 to 2016.12.20 Contract record no.: 2009420000020 Denomination of invention: Method for manufacturing active matter carrier for lithium cell and its assembled cell Granted publication date: 20080102 License type: Exclusive license Record date: 20090515 |
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