CN104934633A - Cylindrical 2000 mAh lithium-ion power battery with large current rapid charging/discharging performance - Google Patents
Cylindrical 2000 mAh lithium-ion power battery with large current rapid charging/discharging performance Download PDFInfo
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- CN104934633A CN104934633A CN201410119173.5A CN201410119173A CN104934633A CN 104934633 A CN104934633 A CN 104934633A CN 201410119173 A CN201410119173 A CN 201410119173A CN 104934633 A CN104934633 A CN 104934633A
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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
- H01M10/052—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
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
-
- 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
Abstract
The invention discloses a preparation method of an 18650 type 2000 mAh lithium-ion power battery with rapid charging/discharging performance used by a high-capacity professional electric tool and relates to the technical field of lithium ion secondary battery manufacturing. The battery comprises a positive plate, a negative plate, a diaphragm, a nonaqueous organic electrolyte and a battery shell. The positive plate is formed by coating aluminum foil with cathode slurry. The negative plate is formed by coating copper foil with anode slurry. The cathode slurry comprises a blend cathode active material, a composite conductive agent, a binder and so on. The anode slurry comprises modified graphite, a conductive agent, the binder and so on. By adopting the optimized battery design, especially positive plate formula and structural design, the cylindrical 2000 mAh lithium-ion battery with large current rapid charging/discharging performance could reduce AC and DC resistance of the battery. Because the battery can be charged and discharged with large current, the cycle performance is increased obviously, especially, because the battery can be charged with 10 A large current and discharged with 20A large current, the charging capacity of the battery at the beginning of circulation could be more than 82.0 percent within 10 minutes.
Description
[technical field]
What the present invention relates to is cylinder 18650-2000mAh electric tool lithium-ion-power cell and manufacture method thereof, has the feature of high current charge-discharge circulation.Belong to technical field of lithium ion secondary.This power brick is containing positive plate, negative plate, barrier film, electrolyte and battery case, positive plate applies anode sizing agent by aluminium foil and forms, negative plate applies cathode size by Copper Foil and forms, barrier film is have the polypropylene of micropore or polyethylene or three-layer polypropylene/polyethylene/polypropylene laminated film, and battery case is made up of Stainless Steel Shell and block.Battery appearance is cylinder, body diameter 18mm, high 65mm, and battery pole group is winding-type electrode assemblie.
[background technology]
China is the manufacture base of world's electric tool, the demand of electric tool market to electrokinetic cell of China is huge, the main supporting ickel-cadmium cell of electric tool in the past, within 2005, Chinese Committee of Development and Reform file publishing clearly limits ickel-cadmium cell, encourage growth lithium ion battery and Ni-H cell, the market share rapid development of current lithium ion battery.High power capacity, high power, low cost become the Main way of following electrokinetic cell development.Electric tool generally uses cylindrical 18650 batteries, i.e. cell diameter 18mm, high 65mm, and capacity is about 1300mAh.Along with improving constantly of user's instructions for use, in the urgent need to more high power capacity, the electrokinetic cell of big current fast charging and discharging can be carried out to meet market.
Difference on positive and negative pole material and electrolyte, technical recipe can make battery have visibly different performance.Anode material for lithium-ion batteries in the market mainly contains cobalt acid lithium (LiCoO
2), LiMn2O4 (LiMn
2o
4), ternary material (Li (Ni
xco
ymn
z) O
2) and LiFePO 4 (LiFePO
4).Ternary material battery because of its combination property superior, be just constantly widely used in electric tool lithium-ion-power cell.Cylinder 18650 motive-power battery capacity is increased to 2000mAh from 1300mAh; need the volumetric specific energy significantly improving battery on the one hand; on the other hand in order to meet big current safe charging; shorten charging interval and saving and protection plate cost; need to reduce the internal resistance of cell, the behavior of stable cell capacity attenuation as far as possible.This just needs the selection to battery material, battery process parameter, electrode formulation and configuration aspects to do larger adjustment.
[summary of the invention]
Mixed active material is adopted in positive pole, find to improve significantly to 18650-2000mAh column type electric tool lithium-ion-power cell rapid charge characteristic, this battery capacity is not less than 2000mAh, quick charge (10A or 5C multiplying power) can be realized, heavy-current discharge (10C), efficiency for charge-discharge is high, and cycle performance is superior.
Lithium-ion-power cell provided by the invention comprises negative plate, barrier film, electrolyte and battery case, except nickle cobalt lithium manganate 84%-97%, binding agent 1%-5% in positive plate slurry, outside combined conductive agent 1%-4%, be also mixed with the spinelle manganic acid lithium material of 0-15% modification.
Mixed cathode active material is cobalt nickel lithium manganate ternary material (NMC532, or NMC442), adds the modified lithium manganate of spinel structure, and binding agent is the nmp solvent of PVDF, and conductive agent is the mixture of Super-P and KS6.
Cylinder 18650-2000mAh provided by the invention professional electric tool lithium ion power battery cathode manufacture method, comprises the following steps:
(1) mixed cathode active material and conductive agent are added mixing and stirring in the 1-METHYLPYRROLIDONE solution being dissolved with Kynoar, make anode sizing agent;
(2) anode sizing agent is coated on 16 μm of thick metal aluminum foils, dries at the temperature of 80-110 DEG C;
(3) by the positive pole roll-in of oven dry, itemize, the positive plate of the band lug of specific dimensions is made;
The beneficial effect of the present invention compared with traditional handicraft is: the lithium-ion-power cell of manufacture of the present invention has the lower internal resistance of cell, discharge capacity is not less than 2000mAh, 10A (5C) quick charge can be realized, 20A (10C) discharge cycles, discharging efficiency is high, and cycle performance is superior.In addition, in cyclic process, the efficiency that 10A constant current charge accounts for total charge capacity also improves, and shortens the charging interval comprehensively.
[accompanying drawing explanation]
Fig. 1 is the process flow diagram that the present invention makes battery.
Fig. 2 is that the embodiment 1,2 made of the present invention and comparative example 1 battery carry out the 10A 20A that charges and to discharge the cyclic curve of 200 times.
Fig. 3 is the embodiment 1,2 made of the present invention and comparative example 1 battery, and 10A constant current charge accounts for total charging (to 4.2V, constant voltage charge ends to 50mA 10A constant current charge) percentage, i.e. constant current charge efficiency.
[embodiment]
The present invention will be described below to enumerate specific embodiment.
Comparative example 1:
To manufacture cylinder 18650-2000Ah lithium battery, select tap density at 2.4-3.3g/cm
3, specific area 0.2-0.5m
2/ g, D
50at 7-13 μm, the nickel-cobalt-manganese ternary material of reversible capacity 145-165mAh/g.Select tap density at 1.2-1.6g/cm
3, specific area 1.5-3.0m
2/ g, D
50at 8-18 μm, the modified artificial graphite powder of reversible capacity 345-365mAh/g is as negative material.
Be the nickel-cobalt-manganese ternary positive electrode active materials of 94.5%, the conductive agent (SP+KS6) of 3.0%, the PVDF binding agent of 2.5% by percentage by weight, mix after adding the 1-METHYLPYRROLIDONE solvent accounting for slurry total amount 30%-38%, make anode sizing agent, anode sizing agent is coated on 15-20 μm of thick metal aluminum foil, at the temperature of 80-110 DEG C after drying, being rolled into thickness is the positive plate that 0.1-0.15mm is thick.
Be the graphous graphite powder of 93.7%, the conductive agent (SP+KS6) of 1.7%, the PVDF of 4.6% by percentage by weight, mix after adding the 1-METHYLPYRROLIDONE solvent accounting for slurry total amount 45-55%, make cathode size, cathode size is coated on 9-12 μm of thick metal copper foil, at the temperature of 80-100 DEG C after drying, being rolled into thickness is the negative plate that 0.10-0.13mm is thick.
Positive/negative plate is cut into strip, one section of tinsel soldering polar ear is reserved at positive pole agreement that contracts a film or TV play to an actor or actress 1/3rd place, negative plate two ends also reserve one section of tinsel soldering polar ear, cylindric pole group is wound into after being superposed by positive/negative plate, place barrier film between positive/negative plate, barrier film used be 16-20 μm of thickness be combined into polypropylene, polyethylene film.The lug laser welding of being drawn by positive plate to be confluxed sheet place at block, and the lug that negative plate is drawn is welded to outer casing bottom, and non-water organic electrolyte vacuum is injected, and is namely assembled into 18650 batteries after sealing changes into.
Adopt above parameter and manufacturing process, 18650 cylindrical lithium-ion power batteries made, capacity reaches 2016mAh, battery internal resistance under a-c cycle 1kHz is 14.6m Ω .10A (5C) quick charge, 20A (10C) heavy-current discharge circulates after 200 times, it is 52.8% that capacity dimension is held in more than 63.2%, 10A constant current charge accounting.At the circulation initial stage, in 10 minutes, battery charge capacity is about 79.0%.
Embodiment 1:
To manufacture cylinder 18650-2000mAh lithium battery, select tap density at 2.4-3.3g/cm
3, specific area 0.2-0.5m
2/ g, D
50at 7-13 μm, the nickel-cobalt-manganese ternary material of reversible capacity 145-165mAh/g, and select D
50at 10-20 μm, capacity is that the modified spinelle manganic acid lithium material of 100-140mAh/g is as positive pole mixed active material.Select tap density at 1.2-1.6g/cm
3, specific area is 1.5-3.0m
2/ g, D
50at 8-18 μm, reversible capacity is that the modified artificial graphite powder of 345-365mAh/g is as negative material.
By percentage by weight be the nickel-cobalt-manganese ternary of 86.8%, 9.0% modified lithium manganate positive electrode active materials, the conductive agent (SP+KS6) of 2.0%, the PVDF binding agent of 2.2%, mix after adding the 1-METHYLPYRROLIDONE solvent accounting for slurry total amount 30%-38%, make anode sizing agent, anode sizing agent is coated on 16-20 μm of thick metal aluminum foil, at the temperature of 80-110 DEG C after drying, being rolled into thickness is the positive plate that 0.1-0.13mm is thick, and negative pole is identical with the negative pole in comparative example 1.
Positive/negative plate is cut into strip, one section of tinsel soldering polar ear is reserved at positive plate 1/3rd place, negative plate two ends also reserve one section of tinsel soldering polar ear, cylindric pole group is wound into after being superposed by positive/negative plate, place barrier film between positive/negative plate, barrier film used be 16-20 μm of thickness be combined into polypropylene, polyethylene film.The lug Laser Welding that positive plate is drawn is welded on block to conflux sheet place, the lug that negative plate is drawn is welded to outer casing bottom, non-water organic electrolyte vacuum is injected, and is namely assembled into 18650 batteries after sealing changes into.
Adopt above parameter and manufacturing process, the 18650 cylindrical lithium-ion power battery capacity made can reach 2010mAh, battery internal resistance under a-c cycle 1kHz is 14.0m Ω .10A quick charge, when 20A heavy-current discharge is circulated to 200 times, capacity dimension holdup more than 73.3%, 10A constant current charge accounting 57.2%.In 10 minutes, battery charge capacity is about 82.0%.
Embodiment 2:
To manufacture cylinder 18650-2000mAh lithium battery, select tap density at 2.4-3.3g/cm
3, specific area 0.2-0.5m
2/ g, D
50at 7-13 μm, the nickel-cobalt-manganese ternary material of reversible capacity 145-165mAh/g, and select D
50at 10-20 μm, the modified lithium manganate material of capacity 100-140mAh/g is as positive electrode.Select tap density at 1.2-1.6g/cm
3, specific area 1.5-3.0m
2/ g, D
50at 8-18 μm, the modified artificial graphite powder of reversible capacity 345-365mAh/g is as negative material.
By percentage by weight be the nickel-cobalt-manganese ternary of 90.8%, 5.0% modified lithium manganate positive electrode active materials, the conductive agent (SP+KS6) of 2.0%, the PVDF binding agent of 2.2%, mix after adding the 1-METHYLPYRROLIDONE solvent accounting for slurry total amount 30%-38%, make anode sizing agent, anode sizing agent is coated on 16-20 μm of thick metal aluminum foil, at the temperature of 80-110 DEG C after drying, being rolled into thickness is the positive plate that 0.1-0.13mm is thick, and negative pole is the negative pole in comparative example 1.
Positive/negative plate is cut into strip, one section of tinsel soldering polar ear is reserved at positive plate 1/3rd place, negative plate two ends also reserve one section of tinsel soldering polar ear, cylindric pole group is wound into after being superposed by positive/negative plate, place barrier film between positive/negative plate, barrier film used is the single layer polyethylene film of 16 μm of thickness.The lug Laser Welding that positive plate is drawn is welded on block to conflux sheet place, the lug that negative plate is drawn is welded to outer casing bottom, non-water organic electrolyte vacuum is injected, and is namely assembled into 18650 batteries after sealing changes into.
Adopt above parameter and manufacturing process, the 18650 cylindrical lithium-ion power battery capacity made can reach 2015mAh, battery internal resistance 13.4m Ω .10A under a-c cycle 1kHz charges, the 20A discharge cycles life-span is when reaching 200 times, capacity dimension holdup more than 77.6%, 10A constant current charge accounting 64.3%.At the circulation initial stage, in 10 minutes, battery charge capacity is 82.3%.
Claims (6)
1. there is the column type 18650-2000mAh electric tool lithium-ion-power cell and manufacture method thereof that improve fast charging and discharging feature, it is characterized in that this power brick is containing positive plate, negative plate, barrier film, electrolyte and battery case, positive plate applies anode sizing agent by aluminium foil and forms, negative plate applies cathode size by Copper Foil and forms, barrier film is the polypropylene of the 15-20 μm of thickness with micropore or polyethylene or three-layer polypropylene/polyethylene/polypropylene laminated film, electrolyte is non-water organic electrolyte, battery case is made up of the block of cylindrical nickel plating box hat and complex function.
2. according to claim 1, it is characterized in that cathode size consists of modified artificial graphite, conductive agent, binding agent etc.
3. according to claim 1, electrolyte is non-water organic electrolyte, comprising hexafluorophosphoric acid lithium salts, and organic solvent EC, DMC, EMC, PC, and functional additive FEC, VC, VEC etc.
4. according to claim 1, it is characterized in that anode sizing agent composition (percentage by weight) comprises cobalt nickel lithium manganate ternary material 84%-97%, modified spinelle manganic acid lithium material 0-15%, combined conductive agent 1%-4%, binding agent 1%-5%.
5. according to claim 4, it is characterized in that positive active material is nickle cobalt lithium manganate (nickel: cobalt: manganese=5: one or both 3: 2 or 4: 4: 2) in ternary material and special modified lithium manganate material, conductive agent is the mixing of Super P and KS6, and binding agent is Kynoar (PVDF6020 or PVDF5130).
6. according to claim 1, it is characterized in that battery appearance is cylinder, body diameter 18mm, high 65mm, battery pole group is winding-type electrode assemblie, and battery capacity is not less than 2000mAh, has that good 10A fills, 20A discharge cycles characteristic, battery uses charging capacity in 10 minutes initial stages to reach more than 82%, and 200 Posterior circle capacity retention rates are more than 74%.
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|---|---|---|---|
| CN201410119173.5A CN104934633A (en) | 2014-03-21 | 2014-03-21 | Cylindrical 2000 mAh lithium-ion power battery with large current rapid charging/discharging performance |
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| CN201410119173.5A CN104934633A (en) | 2014-03-21 | 2014-03-21 | Cylindrical 2000 mAh lithium-ion power battery with large current rapid charging/discharging performance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105405668A (en) * | 2015-12-15 | 2016-03-16 | 宁波南车新能源科技有限公司 | (LMO-NCM-AC)/(LTO-AC) hybrid battery capacitor and preparation method thereof |
| CN107732313A (en) * | 2017-10-27 | 2018-02-23 | 桑顿新能源科技有限公司 | A kind of long circulating high security manganese systems low cost battery core preparation method |
| CN114203969A (en) * | 2021-11-29 | 2022-03-18 | 湖南立方新能源科技有限责任公司 | Preparation method of electrode plate, electrode plate and secondary battery |
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2014
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105405668A (en) * | 2015-12-15 | 2016-03-16 | 宁波南车新能源科技有限公司 | (LMO-NCM-AC)/(LTO-AC) hybrid battery capacitor and preparation method thereof |
| CN105405668B (en) * | 2015-12-15 | 2017-05-10 | 宁波中车新能源科技有限公司 | (LMO-NCM-AC)/(LTO-AC) hybrid battery capacitor and preparation method thereof |
| CN107732313A (en) * | 2017-10-27 | 2018-02-23 | 桑顿新能源科技有限公司 | A kind of long circulating high security manganese systems low cost battery core preparation method |
| CN114203969A (en) * | 2021-11-29 | 2022-03-18 | 湖南立方新能源科技有限责任公司 | Preparation method of electrode plate, electrode plate and secondary battery |
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Application publication date: 20150923 |