CN105226325A - A kind of lithium titanate battery electrolyte and lithium titanate battery - Google Patents

A kind of lithium titanate battery electrolyte and lithium titanate battery Download PDF

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CN105226325A
CN105226325A CN201510694353.0A CN201510694353A CN105226325A CN 105226325 A CN105226325 A CN 105226325A CN 201510694353 A CN201510694353 A CN 201510694353A CN 105226325 A CN105226325 A CN 105226325A
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lithium titanate
titanate battery
plate
electrolyte
negative
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CN105226325B (en
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涂洪成
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Yutong Bus Co Ltd
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Zhengzhou Yutong Bus Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0569—Liquid materials characterised by the solvents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • H01M2300/0028—Organic electrolyte characterised by the solvent
    • H01M2300/0037—Mixture of solvents
    • H01M2300/0042—Four or more solvents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
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  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Secondary Cells (AREA)

Abstract

The present invention relates to a kind of lithium titanate battery electrolyte and lithium titanate battery, belong to technical field of lithium ion.Lithium titanate battery electrolyte of the present invention, comprise following component: the electrolyte lithium salt of 1-1.5mol/L, mass percentage is the vinylene carbonate of 1%-3%, mass percentage is the propane sultone of 1%-5%, mass percentage is the biphenyl of 1-6%, surplus is solvent, and described solvent is made up of the component of following volume ratio: ethylene carbonate: dimethyl carbonate: methyl ethyl carbonate: propene carbonate=10-35:40-65:10-25:1-15.Lithium titanate battery electrolyte of the present invention can reduce the internal resistance of lithium titanate battery, improves the compatibility of electrolyte and lithium titanate material, and then improves high rate performance and the fail safe of lithium titanate battery.

Description

A kind of lithium titanate battery electrolyte and lithium titanate battery
Technical field
The present invention relates to a kind of lithium titanate battery electrolyte and lithium titanate battery, belong to technical field of lithium ion.
Background technology
Due to the exhaustion of traditional energy, new energy technology is more and more subject to people's attention, and lithium ion battery is exactly one wherein.Along with the range of application of lithium ion battery in fields such as electric motor cars is more and more wider, people have higher requirement to the high rate performance of battery, security performance.In prior art, employing is to modes such as the selection of positive electrode, negative material and modifications usually, and improve high rate performance and the security performance of lithium ion battery, this mode is also very effective.But the research of the high rate performance and security performance aspect that improve battery from the internal resistance aspect reducing lithium ion battery is not also a lot.During due to high rate charge-discharge, the heat that its inside of battery that internal resistance is larger causes gathers also more serious, and inside battery thermal accumlation is too much, and the chemical property of lithium ion battery will worsen, and is easy to cause safety issue, even can be explosion caused.
Lithium titanate is as a kind of new lithium ion battery negative material, almost structural change is not had in battery charge and discharge process, be called as " zero strain material ", when being that the comparatively serious positive electrode of structural change makes lithium ion battery as LiMn2O4, ternary material etc. coordinate, the impact of cathode material structure change on battery performance can be offset.But the conductivity of lithium titanate material is poor, the internal resistance of cell made is comparatively large, and in charge and discharge process, if charge-discharge magnification is comparatively large, then the heating caused at inside battery is comparatively serious, have impact on high rate performance and the security performance of lithium titanate battery.
Summary of the invention
The object of the present invention is to provide a kind of lithium titanate battery electrolyte that can reduce the internal resistance of lithium titanate battery.
In order to realize above object, the technical scheme of lithium titanate battery electrolyte of the present invention is as follows:
A kind of lithium titanate battery electrolyte, comprise following component: the electrolyte lithium salt of 1-1.5mol/L, mass percentage is the vinylene carbonate of 1%-3%, mass percentage is the propane sultone of 1%-5%, mass percentage is the biphenyl of 1-6%, surplus is solvent, and described solvent is made up of the component of following volume ratio: ethylene carbonate: dimethyl carbonate: methyl ethyl carbonate: propene carbonate=10-35:40-65:10-25:1-15.
Lithium titanate battery electrolyte of the present invention, adopt multi-solvents and multiple additives, improve the ionic conductivity of electrolyte, with lithium titanate material, there is good compatibility, when being used as the electrolyte of lithium titanate battery, the internal resistance of battery can be reduced, thus improve rate charge-discharge performance and the security performance of lithium titanate battery.
Described electrolyte lithium salt is the one in perfluoro alkyl sulfonic acid acid imide lithium salts, lithium-borate complexes, lithium phosphate complex.Concrete, described electrolyte lithium salt is LiTFSI, LiBF 4, LiPF 6in one.
The technical scheme of lithium titanate battery of the present invention is as follows:
A kind of lithium titanate battery using above-mentioned electrolyte, comprise positive plate and negative plate, described negative plate comprises negative current collector and is coated in the negative electrode material layer on negative current collector, and described negative electrode material layer is made up of the component of following percentage by weight: the conductive agent of the lithium titanate of 82-98%, the binding agent of 1-8%, 1-10%.
Described conductive agent is the combination of a kind of in particle conductive agent, fiber conductive agent or two kinds.Described particle conductive agent is KS-6.Described fiber conductive agent is SP or VGCF.
The hybrid conductive agent that described conductive agent can more preferably be mixed according to the mass ratio of 2-6:1 by acetylene black and electrically conductive graphite.Also can be used alone acetylene black or electrically conductive graphite as conductive agent.
Described binding agent is the binding agent that this area is commonly used, as Kynoar.
Because electrolyte of the present invention can reduce the internal resistance of battery, the lithium titanate material layer on negative plate can adopt larger thickness, and on described negative plate, the surface density of negative electrode material layer is 120-300g/m 2.The compacted density of negative plate is 1.95g/cm 3.The coated side density of positive plate is 240g/m 2, the compacted density of positive plate is 2.8g/cm 3.
In order to give full play to the capacity of positive electrode, the Capacity Ratio of described negative plate and positive plate is 1:1.02-1.15.Concrete, the area of negative plate is greater than the area of positive plate, is covered by positive plate can make negative plate.
Described positive plate comprises plus plate current-collecting body and is coated in the positive electrode material layer on plus plate current-collecting body, and described positive electrode material layer is made up of the component of following percentage by weight: the conductive agent of the positive active material of 89-92.5%, the binding agent of 1-8%, 1-10%.
Described positive active material is cobalt acid lithium, LiMn2O4, LiFePO4, one or several in ternary material.Further, described positive active material is preferably ternary material.
The preparation method of above-mentioned lithium titanate battery comprises the steps:
1) preparation of positive plate: binding agent is added in solvent, mixing, leave standstill to obtain glue, conductive agent and positive active material are added in described glue, the anode sizing agent that solid content is 20-80% is obtained after dispersed, be coated in by anode sizing agent on plus plate current-collecting body, drying, roll-in, section obtain positive plate;
2) preparation of negative plate: binding agent is added in solvent, mixing, leave standstill to obtain glue, conductive agent and negative electrode active material are added in described glue, dispersedly obtain the cathode size that solid content is 20-80%, cathode size is coated on negative current collector, dry, roll-in, section obtains negative plate;
3) positive plate, barrier film, negative plate lamination are made battery core, 80 DEG C of dry 12h, enter shell, inject above-mentioned electrolyte, and sealing, to obtain final product.
Described solvent is 1-METHYLPYRROLIDONE (NMP).
Lithium titanate battery electrolyte of the present invention can reduce the internal resistance of lithium titanate battery, improves the compatibility of electrolyte and lithium titanate material, and then improves high rate performance and the fail safe of lithium titanate battery.The internal resistance of lithium titanate battery of the present invention is 0.6-1.2m Ω, 5C discharge capacity can reach the 87.2-91.8% of 1C charging capacity, cycle-index is more than 8000 times, and pin prick test and squeeze test are all qualified, and high rate performance and security performance are obtained for and significantly improve.
Accompanying drawing explanation
Fig. 1 is the structural representation of the lithium titanate battery of the embodiment of the present invention 1.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is further detailed.
Embodiment 1
The lithium titanate battery electrolyte of the present embodiment, comprise following component: the electrolyte lithium salt of 1.3mol/L, mass percentage is the vinylene carbonate of 1.5%, mass percentage is the propane sultone of 3%, mass percentage is the biphenyl of 4%, surplus is solvent, and described solvent is made up of the component of following volume ratio: ethylene carbonate: dimethyl carbonate: methyl ethyl carbonate: propene carbonate=20:50:15:5.Electrolyte lithium salt is LiBF4 LiBF 4.
The lithium titanate battery of the present embodiment, as shown in Figure 1, comprise positive plate 1, negative plate 2 and barrier film 3, negative plate is made up of negative current collector aluminium foil and the negative electrode material layer be coated on negative current collector, negative electrode material layer is made up of the component of following percentage by weight: the lithium titanate of 88%, the binding agent Kynoar (PVDF) of 5%, 7% conductive agent, conductive agent is that the acetylene black of 6:1 and electrically conductive graphite are formed by weight ratio.The coated side density of negative plate is 200g/m 2, the compacted density of negative plate is 1.95g/cm 3.Positive plate is made up of plus plate current-collecting body aluminium foil and the positive electrode material layer be coated on plus plate current-collecting body, and positive electrode material layer is made up of the component of following percentage by weight: the ternary material of 91%, the conductive agent acetylene black of 3.5% and the conductive agent KS-6 of 1%, the binding agent PVDF of 4.5%.The coated side density of positive plate is 240g/m 2, the compacted density of positive plate is 2.8g/cm 3.
Positive plate and negative plate adopt the mode of interlaced lamination to assemble, and the area of negative plate is greater than the area of positive plate, are covered by positive plate can make negative plate.
The preparation method of the lithium titanate battery of the present embodiment comprises the steps:
1) preparation of positive plate: Kynoar (PVDF) is dissolved in 1-METHYLPYRROLIDONE (NMP), standing 240min obtains glue, conductive agent acetylene black and ternary material are added in above-mentioned glue, dispersedly obtain the anode sizing agent that solid content is 60%, anode sizing agent is coated in anode collection surface, drying, roll-in, the obtained positive plate of section;
2) preparation of negative plate: Kynoar (PVDF) is dissolved in 1-METHYLPYRROLIDONE (NMP), standing 240min obtains glue, the mixture of conductive agent acetylene black and electrically conductive graphite and lithium titanate are added in above-mentioned glue, dispersedly obtain the cathode size that solid content is 40%, cathode size is coated in negative pole currect collecting surface, drying, roll-in, the obtained negative plate of section;
3) positive plate, barrier film, negative plate are stacked assembling in order and make battery core, 80 DEG C of dry 12h, load battery container, inject the above-mentioned electrolyte of 27g, infiltrate, sealing, changes into, partial volume, the lithium titanate battery of obtained 5.5Ah.
Embodiment 2
The lithium titanate battery electrolyte of the present embodiment, comprise following component: the electrolyte lithium salt of 1.0mol/L, mass percentage is the vinylene carbonate of 1.5%, mass percentage is the propane sultone of 3%, mass percentage is the biphenyl of 4%, surplus is solvent, and described solvent is made up of the component of following volume ratio: ethylene carbonate: dimethyl carbonate: methyl ethyl carbonate: propene carbonate=20:50:15:5.Electrolyte lithium salt is LiPF 6.
The lithium titanate battery of the present embodiment, comprise positive plate and negative plate, negative plate is made up of negative current collector aluminium foil and the negative electrode material layer be coated on negative current collector, negative electrode material layer is made up of the component of following percentage by weight: the lithium titanate of 90%, the binding agent Kynoar (PVDF) of 5%, 5% conductive agent, conductive agent is that the acetylene black of 4:1 and electrically conductive graphite are formed by weight ratio.The coated side density of negative plate is 120g/m 2, the compacted density of negative plate is 1.95g/cm 3.Positive plate is made up of plus plate current-collecting body aluminium foil and the positive electrode material layer be coated on plus plate current-collecting body, and positive electrode material layer is made up of the component of following percentage by weight: the ternary material of 91%, the conductive agent acetylene black of 3.5% and the conductive agent KS-6 of 1%, the binding agent PVDF of 4.5%.The coated side density of positive plate is 240g/m 2, the compacted density of positive plate is 2.8g/cm 3.
Positive plate and negative plate adopt the mode of interlaced lamination to assemble, and the area of negative plate is greater than the area of positive plate, are covered by positive plate can make negative plate.
The preparation method of the lithium titanate battery of the present embodiment comprises the steps:
1) preparation of positive plate: Kynoar (PVDF) is dissolved in 1-METHYLPYRROLIDONE (NMP), standing 240min obtains glue, conductive agent acetylene black and ternary material are added in above-mentioned glue, dispersedly obtain the anode sizing agent that solid content is 60%, anode sizing agent is coated in anode collection surface, drying, roll-in, the obtained positive plate of section;
2) preparation of negative plate: Kynoar (PVDF) is dissolved in 1-METHYLPYRROLIDONE (NMP), standing 240min obtains glue, the mixture of conductive agent acetylene black and electrically conductive graphite and lithium titanate are added in above-mentioned glue, dispersedly obtain the cathode size that solid content is 40%, cathode size is coated in negative pole currect collecting surface, drying, roll-in, the obtained negative plate of section;
3) positive plate, barrier film, negative plate are stacked assembling in order and make battery core, 80 DEG C of dry 12h, load battery container, inject the above-mentioned electrolyte of 27g, infiltrate, sealing, changes into, partial volume, the lithium titanate battery of obtained 5.5Ah.
Embodiment 3
The lithium titanate battery electrolyte of the present embodiment, comprise following component: the electrolyte lithium salt of 1.2mol/L, mass percentage is the vinylene carbonate of 1.5%, mass percentage is the propane sultone of 3%, mass percentage is the biphenyl of 4%, surplus is solvent, and described solvent is made up of the component of following volume ratio: ethylene carbonate: dimethyl carbonate: methyl ethyl carbonate: propene carbonate=25:50:15:10.Electrolyte lithium salt is LiPF 6.
The lithium titanate battery of the present embodiment, comprise positive plate and negative plate, negative plate is made up of negative current collector aluminium foil and the negative electrode material layer be coated on negative current collector, negative electrode material layer is made up of the component of following percentage by weight: the lithium titanate of 85%, the binding agent Kynoar (PVDF) of 5%, 5% conductive agent, conductive agent is that the acetylene black of 4:1 and electrically conductive graphite are formed by weight ratio.The coated side density of negative plate is 300g/m 2, the compacted density of negative plate is 1.95g/cm 3.Positive plate is made up of plus plate current-collecting body aluminium foil and the positive electrode material layer be coated on plus plate current-collecting body, and positive electrode material layer is made up of the component of following percentage by weight: the ternary material of 91%, the conductive agent acetylene black of 3.5% and the conductive agent KS-6 of 1%, the binding agent PVDF of 4.5%.The coated side density of positive plate is 240g/m 2, the compacted density of positive plate is 2.8g/cm 3.
Positive plate and negative plate adopt the mode of interlaced lamination to assemble, and the area of negative plate is greater than the area of positive plate, are covered by positive plate can make negative plate.
The preparation method of the lithium titanate battery of the present embodiment comprises the steps:
1) preparation of positive plate: Kynoar (PVDF) is dissolved in 1-METHYLPYRROLIDONE (NMP), standing 240min obtains glue, conductive agent acetylene black and ternary material are added in above-mentioned glue, dispersedly obtain the anode sizing agent that solid content is 60%, anode sizing agent is coated in anode collection surface, drying, roll-in, the obtained positive plate of section;
2) preparation of negative plate: Kynoar (PVDF) is dissolved in 1-METHYLPYRROLIDONE (NMP), standing 240min obtains glue, the mixture of conductive agent acetylene black and electrically conductive graphite and lithium titanate are added in above-mentioned glue, dispersedly obtain the cathode size that solid content is 40%, cathode size is coated in negative pole currect collecting surface, drying, roll-in, the obtained negative plate of section;
3) positive plate, barrier film, negative plate are stacked assembling in order and make battery core, 80 DEG C of dry 12h, load battery container, inject the above-mentioned electrolyte of 27g, infiltrate, sealing, changes into, partial volume, the lithium titanate battery of obtained 5.5Ah.
Embodiment 4
The lithium titanate battery electrolyte of the present embodiment, comprise following component: the electrolyte lithium salt of 1.2mol/L, mass percentage is the vinylene carbonate of 1%, mass percentage is the propane sultone of 5%, mass percentage is the biphenyl of 1%, surplus is solvent, and described solvent is made up of the component of following volume ratio: ethylene carbonate: dimethyl carbonate: methyl ethyl carbonate: propene carbonate=30:40:15:5.Electrolyte lithium salt is LiPF 6.
The lithium titanate battery of the present embodiment, comprise positive plate and negative plate, negative plate is made up of negative current collector aluminium foil and the negative electrode material layer be coated on negative current collector, negative electrode material layer is made up of the component of following percentage by weight: the lithium titanate of 88%, the binding agent Kynoar (PVDF) of 5%, 7% conductive agent, conductive agent is that the acetylene black of 6:1 and electrically conductive graphite are formed by weight ratio.The coated side density of negative plate is 200g/m 2, the compacted density of negative plate is 1.95g/cm 3.Positive plate is made up of plus plate current-collecting body aluminium foil and the positive electrode material layer be coated on plus plate current-collecting body, and positive electrode material layer is made up of the component of following percentage by weight: the ternary material of 92.5%, the conductive agent acetylene black of 3% and the conductive agent KS-6 of 1%, the binding agent PVDF of 3.5%.The coated side density of positive plate is 240g/m 2, the compacted density of positive plate is 2.8g/cm 3.
Positive plate and negative plate adopt the mode of interlaced lamination to assemble, and the area of negative plate is greater than the area of positive plate, are covered by positive plate can make negative plate.
The preparation method of the lithium titanate battery of the present embodiment comprises the steps:
1) preparation of positive plate: Kynoar (PVDF) is dissolved in 1-METHYLPYRROLIDONE (NMP), standing 240min obtains glue, conductive agent acetylene black and ternary material are added in above-mentioned glue, dispersedly obtain the anode sizing agent that solid content is 60%, anode sizing agent is coated in anode collection surface, drying, roll-in, the obtained positive plate of section;
2) preparation of negative plate: Kynoar (PVDF) is dissolved in 1-METHYLPYRROLIDONE (NMP), standing 240min obtains glue, the mixture of conductive agent acetylene black and electrically conductive graphite and lithium titanate are added in above-mentioned glue, dispersedly obtain the cathode size that solid content is 40%, cathode size is coated in negative pole currect collecting surface, drying, roll-in, the obtained negative plate of section;
3) positive plate, barrier film, negative plate are stacked assembling in order and make battery core, 80 DEG C of dry 12h, load battery container, inject the above-mentioned electrolyte of 27g, infiltrate, sealing, changes into, partial volume, the lithium titanate battery of obtained 5.5Ah.
Embodiment 5
The lithium titanate battery electrolyte of the present embodiment, comprise following component: the electrolyte lithium salt of 1.2mol/L, mass percentage is the vinylene carbonate of 3%, mass percentage is the propane sultone of 1%, mass percentage is the biphenyl of 6%, surplus is solvent, and described solvent is made up of the component of following volume ratio: ethylene carbonate: dimethyl carbonate: methyl ethyl carbonate: propene carbonate=25:45:25:5.Electrolyte lithium salt is LiTFSI.
The lithium titanate battery of the present embodiment, comprise positive plate and negative plate, negative plate is made up of negative current collector aluminium foil and the negative electrode material layer be coated on negative current collector, negative electrode material layer is made up of the component of following percentage by weight: the lithium titanate of 88%, the binding agent Kynoar (PVDF) of 5%, 7% conductive agent, conductive agent is that the acetylene black of 6:1 and electrically conductive graphite are formed by weight ratio.The coated side density of negative plate is 200g/m 2, the compacted density of negative plate is 1.95g/cm 3.Positive plate is made up of plus plate current-collecting body aluminium foil and the positive electrode material layer be coated on plus plate current-collecting body, and positive electrode material layer is made up of the component of following percentage by weight: the ternary material of 89%, the conductive agent acetylene black of 4% and the conductive agent KS-6 of 1.5%, the binding agent PVDF of 5.5%.The coated side density of positive plate is 240g/m 2, the compacted density of positive plate is 2.8g/cm 3.
Positive plate and negative plate adopt the mode of interlaced lamination to assemble, and the area of negative plate is greater than the area of positive plate, are covered by positive plate can make negative plate.
The preparation method of the lithium titanate battery of the present embodiment comprises the steps:
1) preparation of positive plate: Kynoar (PVDF) is dissolved in 1-METHYLPYRROLIDONE (NMP), standing 240min obtains glue, conductive agent acetylene black and ternary material are added in above-mentioned glue, dispersedly obtain the anode sizing agent that solid content is 60%, anode sizing agent is coated in anode collection surface, drying, roll-in, the obtained positive plate of section;
2) preparation of negative plate: Kynoar (PVDF) is dissolved in 1-METHYLPYRROLIDONE (NMP), standing 240min obtains glue, the mixture of conductive agent acetylene black and electrically conductive graphite and lithium titanate are added in above-mentioned glue, dispersedly obtain the cathode size that solid content is 60%, cathode size is coated in negative pole currect collecting surface, drying, roll-in, the obtained negative plate of section;
3) positive plate, barrier film, negative plate are stacked assembling in order and make battery core, 80 DEG C of dry 12h, load battery container, inject the above-mentioned electrolyte of 27g, infiltrate, sealing, changes into, partial volume, the lithium titanate battery of obtained 5.5Ah.
Comparative example 1
The lithium titanate battery electrolyte of this comparative example, comprises following component: the electrolyte lithium salt of 1.2mol/L, and solvent is made up of the component of following volume ratio: ethylene carbonate: dimethyl carbonate: methyl ethyl carbonate: propene carbonate=20:50:15:5.Electrolyte lithium salt is LiPF 6.
The lithium titanate battery of this comparative example, comprise positive plate and negative plate, negative plate is made up of negative current collector aluminium foil and the negative electrode material layer be coated on negative current collector, negative electrode material layer is made up of the component of following percentage by weight: the lithium titanate of 88%, the binding agent Kynoar (PVDF) of 5%, 7% conductive agent, conductive agent is that the acetylene black of 6:1 and electrically conductive graphite are formed by weight ratio.The coated side density of negative plate is 200g/m 2, the compacted density of negative plate is 1.95g/cm 3.Positive plate is made up of plus plate current-collecting body aluminium foil and the positive electrode material layer be coated on plus plate current-collecting body, and positive electrode material layer is made up of the component of following percentage by weight: the ternary material of 89%, the conductive agent acetylene black of 4.5% and the conductive agent KS-6 of 1%, the binding agent PVDF of 5.5%.The coated side density of positive plate is 240g/m 2, the compacted density of positive plate is 2.8g/cm 3.
Positive plate and negative plate adopt the mode of interlaced lamination to assemble, and the area of negative plate is greater than the area of positive plate, are covered by positive plate can make negative plate.
The preparation method of the lithium titanate battery of this comparative example comprises the steps:
1) preparation of positive plate: Kynoar (PVDF) is dissolved in 1-METHYLPYRROLIDONE (NMP), standing 240min obtains glue, conductive agent acetylene black and ternary material are added in above-mentioned glue, dispersedly obtain anode sizing agent, anode sizing agent is coated in anode collection surface, drying, roll-in, the obtained positive plate of section;
2) preparation of negative plate: Kynoar (PVDF) is dissolved in 1-METHYLPYRROLIDONE (NMP), standing 240min obtains glue, the mixture of conductive agent acetylene black and electrically conductive graphite and lithium titanate are added in above-mentioned glue, dispersedly obtain cathode size, cathode size is coated in negative pole currect collecting surface, drying, roll-in, the obtained negative plate of section;
3) positive plate, barrier film, negative plate are stacked assembling in order and make battery core, 80 DEG C of dry 12h, load battery container, inject the above-mentioned electrolyte of 27g, infiltrate, sealing, changes into, partial volume, the lithium titanate battery of obtained 5.5Ah.
Test example
The lithium titanate battery obtained in embodiment 1-5 and comparative example is carried out electrochemical property test according to the method for testing in GB QC/T743-2006 " lithium-ions battery used for electric vehicle ", and test result is as shown in table 1.
The chemical property of the lithium titanate battery in table 1 embodiment 1-5 and comparative example
As shown in Table 1, the internal resistance of lithium titanate battery of the present invention is the 87.2-91.8% that 0.6-1.2m Ω, 5C discharge capacity can reach 1C charging capacity, and cycle-index is more than 8000 times, pin prick test and squeeze test are all qualified, and high rate performance and security performance are obtained for and significantly improve.

Claims (8)

1. a lithium titanate battery electrolyte, it is characterized in that, comprise following component: the electrolyte lithium salt of 1-1.5mol/L, mass percentage is the vinylene carbonate of 1%-3%, mass percentage is the propane sultone of 1%-5%, mass percentage is the biphenyl of 1-6%, and surplus is solvent, and described solvent is made up of the component of following volume ratio: ethylene carbonate: dimethyl carbonate: methyl ethyl carbonate: propene carbonate=10-35:40-65:10-25:1-15.
2. lithium titanate battery electrolyte as claimed in claim 1, it is characterized in that, described electrolyte lithium salt is LiTFSI, LiBF 4, LiPF 6in one.
3. one kind uses the lithium titanate battery of electrolyte as claimed in claim 1, it is characterized in that, comprise positive plate and negative plate, described negative plate comprises negative current collector and is coated in the negative electrode material layer on negative current collector, and described negative electrode material layer is made up of the component of following percentage by weight: the conductive agent of the lithium titanate of 82-98%, the binding agent of 1-8%, 1-10%.
4. lithium titanate battery as claimed in claim 3, it is characterized in that, the Capacity Ratio of described negative plate and positive plate is 1:1.02-1.15.
5. lithium titanate battery as claimed in claim 3, it is characterized in that, on described negative plate, the surface density of negative electrode material layer is 120-300g/m 2.
6. lithium titanate battery as claimed in claim 3, it is characterized in that, described conductive agent is mixed according to the mass ratio of 2-6:1 by acetylene black and electrically conductive graphite.
7. lithium titanate battery as claimed in claim 3, it is characterized in that, described positive plate comprises plus plate current-collecting body and is coated in the positive electrode material layer on plus plate current-collecting body, and described positive electrode material layer is made up of the component of following percentage by weight: the conductive agent of the positive active material of 89-92.5%, the binding agent of 1-8%, 1-10%.
8. lithium titanate battery as claimed in claim 7, is characterized in that, described positive active material is one or several in cobalt acid lithium, LiMn2O4, LiFePO4, ternary material.
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