CN106328985A - High-performance lithium iron phosphate cylindrical battery and preparation method thereof - Google Patents
High-performance lithium iron phosphate cylindrical battery and preparation method thereof Download PDFInfo
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- CN106328985A CN106328985A CN201510353221.1A CN201510353221A CN106328985A CN 106328985 A CN106328985 A CN 106328985A CN 201510353221 A CN201510353221 A CN 201510353221A CN 106328985 A CN106328985 A CN 106328985A
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- Prior art keywords
- iron phosphate
- cylindrical battery
- preparation
- conductive agent
- battery
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a high-performance lithium iron phosphate cylindrical battery and a preparation method thereof. The method comprises the following steps of (1) preparing positive electrode slurry from spherical lithium iron phosphate powder of which the primary particle sizes are 100-500nm, a high-pore carbon black conductive agent and a carbon fiber compound of which the diameter is about 0.1 micron and the length is 6-8 microns at the ratio, forming a compound conductive agent by the high-pore carbon black conductive agent and the carbon fiber compound and building a conductive network; (2) preparing negative electrode slurry from small particle size spherical graphite, conductive carbon black and water gel at the ratio; and (3) taking an aluminum foil and a copper foil as a positive current collector and a negative current collector respectively and preparing the cylindrical battery by an end surface welding technology by winding a positive pole piece, a membrane and a negative pole piece layer by layer. The high-performance lithium iron phosphate cylindrical battery has the advantages that the internal resistance of the battery is relatively small, the temperature rise of the battery in the charging and discharging processes is reduced and the rate capability, the safety performance and the cycling stability of the battery are excellent.
Description
[technical field]
The invention belongs to technical field of lithium ion, be specifically related to a kind of high-performance iron phosphate lithium cylindrical battery
And preparation method.
[background technology]
Fast development and people's demand to clean and effective Renewable resource, countries in the world political affairs along with new forms of energy
New Energy Industry is all classified as emphasis and encourages to help object by mansion, and new-energy automobile entered especially at nearly 2 years at a high speed
Period of expansion, replacing fuel oil to drive with electric energy will be as social sustainable development with human ecological environment brings welfare.
Lithium ion battery demonstrates important effect in actual applications, and LiFePO4 is because having high safety, long circulating
Life-span, good thermal stability and the plurality of advantages such as abundance and environment-protecting asepsis become electrokinetic cell (predominantly
Large Electric equipment) ideal chose.
The fast development of electric vehicle proposes requirements at the higher level to electrokinetic cell Large Copacity and high power performance,
Battery structure and catchment effect extreme influence ferric phosphate lithium cell internal resistance and charge-discharge magnification, use simple work
Skill prepares the good lithium battery of catchment effect can be effectively improved the electric property of LiFePO4, meets actual to dynamic
The demand of power power supply large-capacity high-power, for improving the performance of lithium ion battery high-multiplying power discharge, uses end face
Weldering simple process prepares the cylinder aluminum hull ferric phosphate lithium cell of a kind of high power charging-discharging, long circulation life.
[summary of the invention]
The present invention is directed to problem above, it is provided that a kind of high-performance iron phosphate lithium cylindrical battery and preparation method, should
Battery manufacture operation is simpler, and multiplying power height, long circulation life and low temperature properties are good, improve electrokinetic cell high
Multiplying power discharging and security performance, the application of extension electrokinetic cell.Its technical scheme used is:
1. high-performance iron phosphate lithium cylindrical battery and a preparation method, including shell, both positive and negative polarity, electrolyte
And barrier film, its step is as follows:
(1) by the spherical LiFePO 4 powder that primary particle size is 100-500nm, high hole carbon black conductive agent is with straight
Footpath is about 0.1 μm, and the carbon fiber composite of a length of 6-8 μm prepares anode sizing agent, high hole charcoal in proportion
Black conductive agent and carbon fiber composite form compound conductive agent and are built into conductive network；
(2) small particle spherical graphite, conductive black, water system glue are prepared cathode size in proportion；
(3) respectively with aluminium foil and Copper Foil for both positive and negative polarity collector, by by positive plate, barrier film, negative pole lamella
Layer winding, uses end face weld technology to make cylindrical battery.
Preferably, described cell outside diameter is 37.6 ± 0.1mm, and height is 127.1 ± 0.1mm, anode collection
Body aluminum foil thickness is 15-20 μm, and negative current collector copper thickness is 8-15 μm.
Preferably, described shell uses the material of light weight easy heat radiation；Described compound conductive agent is with low amounts height hole
Spherical white carbon black is conduction fulcrum, and is connected by each fulcrum by carbon fiber composite.
Preferably, described anode sizing agent nano-grade lithium iron phosphate 91wt%-94%, conductive agent 3wt%-5wt%, bonding
Agent 2wt%-4wt%；Described cathode size graphite 92wt%-95wt%, conductive agent 2wt%-4wt%, binding agent
3wt%-4wt%.
Preferably, it is 6-10mm that positive pole foil is left white width, and it is 7-9mm that negative pole foil is left white width.
Beneficial effects of the present invention:
The present invention makes battery manufacture operation simpler, is confluxed the reduction internal resistance of cell by full lug, improves dynamic
Power battery high-multiplying power discharge and security performance, the application of extension electrokinetic cell.
[accompanying drawing explanation]
Fig. 1 is the SEM figure of nano-scale lithium iron phosphate；
Fig. 2 is small particle graphite cathode SEM figure；
Fig. 3 is the conductive network schematic diagram that conductive agent is formed by synergism
Fig. 4 is extruding longitudinally coating both positive and negative polarity schematic diagram
Fig. 5 300 weeks cyclic curve figures of battery different multiplying charge and discharge
Fig. 6 battery 3C/6C charge and discharge cycles curve
Fig. 7 is battery-10Ah aluminum hull charging and discharging curve figure under 1C, 3C, 6C and 10C multiplying power
Fig. 8 is battery-10Ah aluminum hull at-20 DEG C and-35 DEG C, 1C discharge curve
[detailed description of the invention]
Below in conjunction with the accompanying drawings specifically being released in of the present invention is described in further detail.Concrete preparation
Method is as follows:
Positive and negative pole material is the most uniformly mixed, on the premise of slurry is dispersed, uses longitudinally extruding to be coated with
Mode for cloth, at positive pole edge remaining 6-10mm blank aluminium foil in positive plate coating procedure；Negative plate coating procedure
In at negative pole edge remaining 7-9mm blank Copper Foil；After being dried roller, by barrier film, positive pole, barrier film, negative pole
Sequential volume is coiled into cylindrical cell；Through ultrasonic rub flat, positive/negative laser spot welding conflux sheet, insert central canal,
The operations such as laser spot welding both positive and negative polarity cover plate, laser seal, fluid injection steel ball sealing prepare end face weld aluminum-shell battery.
Embodiment
By nano-grade lithium iron phosphate, conductive black, electrically conductive graphite, Kynoar by 93%: 3.5%: 1%: 2.5%
Preparation anode sizing agent, is dissolved in binding agent in NMP, and dispersed with stirring is uniform, forms glue；By SP, VGCF,
ECP etc. are dissolved in NMP, and the regulation dispersed 2h of mixing speed forms conductive liquid；Conductive liquid and glue are mixed
Add 50% ferrum lithium powder, dispersed with stirring after conjunction, add remaining 50% ferrum lithium powder, in vacuum be
Stir under-0.09MPa formation positive pole mother solution.
Graphite, conductive black, water system glue are configured to cathode size by 94.5%: 2%: 3.5%, by SP and
VGCF dispersed with stirring soluble in water, adds binding agent and deionized water dispersion stirs, and is eventually adding NMP,
Stir under vacuum is for-0.09MPa formation negative pole mother solution.
The battery of preparation is at 100.5% that 10C discharge capacitance is 1C capacity, when 6C fills 15C electric discharge,
Charging constant current ratio is more than 89%；Battery table reveals good cycle performance and cryogenic property: 3C circulation 1580
Secondary, capacity is maintained at more than 86%, and 1580 capacity of 6C discharge and recharge are maintained at more than 81%, 10C charge and discharge 300
Secondary capability retention reaches 85%；The capability retention of-20 DEG C of 1C electric discharges is 85.67% ,-35 DEG C of 1C electric discharges
Capability retention be 76.87%.Do as one likes energy datagram is it can be seen that the phosphoric acid prepared by end face weld technique
Ferrum lithium cylindrical battery has preferably circulation, multiplying power and cryogenic property.
Embodiment described above only have expressed one embodiment of the present invention, and it describes more concrete and detailed,
But therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for this area
Those of ordinary skill for, without departing from the inventive concept of the premise, it is also possible to make some deformation and
Improving, these broadly fall into protection scope of the present invention.
Claims (5)
1. high-performance iron phosphate lithium cylindrical battery and a preparation method, including shell, both positive and negative polarity, electrolyte
And barrier film, its step is as follows:
(1) by the spherical LiFePO 4 powder that primary particle size is 100-500nm, high hole carbon black conductive agent is with straight
Footpath is about 0.1 μm, and the carbon fiber composite of a length of 6-8 μm prepares anode sizing agent, high hole charcoal in proportion
Black conductive agent and carbon fiber composite form compound conductive agent and are built into conductive network；
(2) small particle spherical graphite, conductive black, water system glue are prepared cathode size in proportion；
(3) respectively with aluminium foil and Copper Foil for both positive and negative polarity collector, by by positive plate, barrier film, negative pole lamella
Layer winding, uses end face weld technology to make cylindrical battery.
2. high-performance iron phosphate lithium cylindrical battery as claimed in claim 1 and preparation method, it is characterised in that:
Described cell outside diameter is 37.6 ± 0.1mm, and height is 127.1 ± 0.1mm, and plus plate current-collecting body aluminum foil thickness is
15-20 μm, negative current collector copper thickness is 8-15 μm.
3. high-performance iron phosphate lithium cylindrical battery as claimed in claim 1 and preparation method, it is characterised in that:
Described shell uses the material of light weight easy heat radiation；Described compound conductive agent with the low amounts spherical white carbon black of height hole is
Conduction fulcrum, and by carbon fiber composite, each fulcrum is connected.
4. high-performance iron phosphate lithium cylindrical battery as claimed in claim 1 and preparation method, it is characterised in that:
Described anode sizing agent nano-grade lithium iron phosphate 91wt%-94%, conductive agent 3wt%-5wt%, binding agent 2wt%-4wt%；
Described cathode size graphite 92wt%-95wt%, conductive agent 2wt%-4wt%, binding agent 3wt%-4wt%.
5. high-performance iron phosphate lithium cylindrical battery as claimed in claim 1 and preparation method, it is characterised in that:
It is 6-10mm that positive pole foil is left white width, and it is 7-9mm that negative pole foil is left white width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510353221.1A CN106328985A (en) | 2015-06-17 | 2015-06-17 | High-performance lithium iron phosphate cylindrical battery and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510353221.1A CN106328985A (en) | 2015-06-17 | 2015-06-17 | High-performance lithium iron phosphate cylindrical battery and preparation method thereof |
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| Publication Number | Publication Date |
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| CN106328985A true CN106328985A (en) | 2017-01-11 |
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| CN201510353221.1A Pending CN106328985A (en) | 2015-06-17 | 2015-06-17 | High-performance lithium iron phosphate cylindrical battery and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106205A (en) * | 2007-08-21 | 2008-01-16 | 中国科学院上海微系统与信息技术研究所 | A coiling lithium ion battery and its making method |
| CN101436654A (en) * | 2007-11-13 | 2009-05-20 | 深圳市慧通天下科技股份有限公司 | Ferric phosphate lithium type safety high power lithium ion battery |
| CN102569740A (en) * | 2011-12-31 | 2012-07-11 | 杭州力奥科技有限公司 | Method for manufacturing and coating anode slurry of lithium iron phosphate battery |
| CN104347880A (en) * | 2014-10-14 | 2015-02-11 | 东莞新能源科技有限公司 | Lithium ion battery capable of quick charging |
-
2015
- 2015-06-17 CN CN201510353221.1A patent/CN106328985A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106205A (en) * | 2007-08-21 | 2008-01-16 | 中国科学院上海微系统与信息技术研究所 | A coiling lithium ion battery and its making method |
| CN101436654A (en) * | 2007-11-13 | 2009-05-20 | 深圳市慧通天下科技股份有限公司 | Ferric phosphate lithium type safety high power lithium ion battery |
| CN102569740A (en) * | 2011-12-31 | 2012-07-11 | 杭州力奥科技有限公司 | Method for manufacturing and coating anode slurry of lithium iron phosphate battery |
| CN104347880A (en) * | 2014-10-14 | 2015-02-11 | 东莞新能源科技有限公司 | Lithium ion battery capable of quick charging |
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Application publication date: 20170111 |