CN103474660A - Lithium vanadium phosphate and graphite C system lithium ion battery and preparation method thereof - Google Patents
Lithium vanadium phosphate and graphite C system lithium ion battery and preparation method thereof Download PDFInfo
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- CN103474660A CN103474660A CN2013103819354A CN201310381935A CN103474660A CN 103474660 A CN103474660 A CN 103474660A CN 2013103819354 A CN2013103819354 A CN 2013103819354A CN 201310381935 A CN201310381935 A CN 201310381935A CN 103474660 A CN103474660 A CN 103474660A
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Abstract
The invention discloses a lithium vanadium phosphate and graphite C system lithium ion battery and a preparation method thereof. An anode material of the lithium ion battery comprises 85-95% of lithium vanadium phosphate, 1-10% of aqueous binder and 1-10% of conductive agent, and a cathode material of the lithium ion battery comprises 85-95% of graphite, 1-10% of aqueous binder and 1-10% of conductive agent. An anode and a cathode which are concerned with the method adopt the aqueous binder, and pure water serves as a solvent, so that the method is safe, environment-friendly, low in cost, and easy and simple to operate; and moisture is strictly removed by a special technology, so that the quality of the battery is ensured. The lithium ion battery is high in capacity density, high in voltage platform, long in cycle life, excellent in low temperature property, and good in multiplying power charge and discharge property, and is particularly applicable to a hybrid electric vehicle, a pure electric vehicle, an automobile start power supply, a large power station energy storage system and the like in an alpine region.
Description
Technical field
The invention belongs to the lithium ion battery field, relate to a kind of phosphoric acid vanadium lithium and graphite C system lithium ion battery and preparation method thereof.
Background technology
The lithium ion battery newly-developed of the fossil class energy is very swift and violent as an alternative, and it is high with capacity density, and the advantages such as environmentally safe have obtained people's common concern, and are widely used in fields such as electric automobile, large-scale energy storage.
In numerous lithium ion battery materials, phosphoric acid vanadium lithium (Li3V2 (PO4) 3) is emerging lithium ion battery material, belong to monocline, it is high that monocline has a lithium ion diffusion coefficient, the de-good advantage of embedding performance, so phosphoric acid vanadium lithium battery cryogenic property, rate charge-discharge excellent performance.Each crystal structure of phosphoric acid vanadium lithium can have at most 3 lithium ions to take off embedding, more than theoretical gram volume reaches as high as 200mAh/g.Phosphoric acid vanadium lithium has higher capacity density and voltage platform compared to other positive electrodes such as LiMn2O4, cobalt acid lithium, LiFePO4s.
LiFePO4 environmental friendliness, discharging voltage balance, have good thermal stability and good cycle characteristics, but the LiFePO4 capacity density is low, poor performance at low temperatures, rate charge-discharge poor performance.And in the phosphoric acid vanadium lithium crystal unit, have 3 lithium ions can take off embedding, and capacity density is far above LiFePO4, and phosphoric acid vanadium lithium has monocline, and cryogenic property, rate charge-discharge performance are than the LiFePO4 excellence.The phosphoric acid vanadium lithium voltage platform, higher than LiFePO4, is depressed phosphoric acid vanadium lithium battery series connection number of elements in same electrical and is less than the ferric phosphate lithium cell number of elements, reduces costs, and saves the energy.
Adopt PVDF as adhesive, there is the risk of catching fire, exploding in its solvent NMP (n-formyl sarcolysine base pyrrolidones) in the pole coating process, the rear smell of NMP volatilization is pungent, contaminated environment, must be reclaimed, and need strictly to control moisture in the electrode fabrication process, increase battery manufacture cost and process control difficulty.Adopt aqueous binder, using pure water as solvent, can effectively address the above problem, but need in the subsequent technique process, strictly remove moisture.
Summary of the invention
The object of the present invention is to provide a kind of lithium ion battery that phosphoric acid vanadium lithium is negative pole as anodal, the graphite C of take and preparation method thereof of take.
The technical scheme that the present invention solves its technical problem is as follows:
A kind of phosphoric acid vanadium lithium and graphite C system lithium ion battery, its positive electrode is comprised of phosphoric acid vanadium lithium 85%-95%, aqueous binder 1%-10%, conductive agent 1%-10%, and its negative material is comprised of graphite C 85%-95%, aqueous binder 1%-10%, conductive agent 1%-10%; Wherein, percentage is mass percent.
Preferred technical scheme is: described aqueous binder is at least one in 103 glue, 103A glue, 105 glue, 105A glue.
Preferred technical scheme is: described conductive agent is at least one in SP, electrically conductive graphite, superconduction carbon black, carbon nano-tube.
The preparation method of above-mentioned lithium ion battery, comprise the steps:
1) making of positive plate: above-mentioned positive electrode is dissolved in pure water, after high-speed stirred anode sizing agent, anode sizing agent is coated on aluminium foil uniformly, aluminium foil, after vacuum bakeout 6-12 hour, roll extrusion, cuts into positive plate;
2) making of negative plate: above-mentioned negative material is dissolved in pure water, after high-speed stirred cathode size, cathode size is coated on Copper Foil uniformly, Copper Foil, after vacuum bakeout 6-12 hour, roll extrusion, cuts into negative plate;
3) positive and negative plate after vacuum bakeout 24-48 hour, is laminated into battery core by positive plate, barrier film, negative plate respectively;
4) battery core is loaded in battery container, after vacuum bakeout 48-96 hour, fluid injection, changes into partial volume and makes lithium ion battery.
Preferred technical scheme is: described vacuum pressure is-0.07～-0.1MPa.
Preferred technical scheme is: described baking temperature is 70～120 ℃.
Advantage of the present invention and beneficial effect are: the capacity of lithium ion battery density the present invention relates to is high, voltage platform is high, have extended cycle life, low temperature performance excellent, rate charge-discharge performance are good, is particularly suitable for hybrid vehicle, pure electric automobile, automobile starting power supply, large-scale power station energy-storage system of extremely frigid zones etc.The present invention adopts aqueous binder, usings pure water as solvent, and fail safe is good, environment friendly and pollution-free, with low cost, easy and simple to handle, and strictly removes moisture by special technique, has guaranteed battery quality, but large scale application.
The accompanying drawing explanation
Fig. 1 is the charge graph of the embodiment of the present invention 1 lithium ion battery; Fig. 2 is the discharge curve of the embodiment of the present invention 1 lithium ion battery.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated, but be not limited to this.
Following a kind of phosphoric acid vanadium lithium and graphite C system lithium ion battery, comprise positive pole, negative pole, barrier film, electrolyte and shell.
Barrier film is: PP material single-layer septum; Electrolyte is: 1.2mol/L LiPF6 solution, and solvent composition is EC: DMC: EMC=1: 1: 1; Shell is aluminium casing.
103 glue, 103A glue, 105 glue, 105A glue are all purchased from Beijing Pai Ensi energy science and technology Development Co., Ltd.
Embodiment 1
Positive electrode comprises: 88% phosphoric acid vanadium lithium, 6% 103 glue, 6% SP;
Negative material comprises: 91% graphite C, 5% 105 glue, 4% SP.
Concrete preparation method is as follows for lithium ion battery:
1) making of positive plate: by formula ratio, add positive electrode, adding pure water dissolves, even by double-planet power mixer high-speed stirred, eliminate bubble, iron filings, anode sizing agent, anode sizing agent is uniformly coated on aluminium foil through automatical feeding system, coating machine, under-0.09MPa, 100 ℃ of bakings, after 8 hours, roll-in, cut into positive plate;
2) making of negative plate: by formula ratio, add negative material, adding pure water dissolves, even by double-planet power mixer high-speed stirred, eliminate bubble, iron filings, cathode size, cathode size is uniformly coated on Copper Foil through automatical feeding system, coating machine, under-0.09MPa, 100 ℃ of bakings, after 8 hours, roll-in, cut into negative plate;
3) respectively the 80 ℃ of bakings under-0.09MPa of positive plate, negative plate, after 24 hours, are laminated into to battery core by positive plate, barrier film, negative plate;
4) battery core is loaded in battery container, through the lower 80 ℃ of bakings of-0.09MPa after 48 hours, fluid injection, changes into partial volume and makes the 100Ah battery.The battery charging and discharging curve as shown in Figure 1 and Figure 2.
Embodiment 2
Positive electrode comprises: 90% phosphoric acid vanadium lithium, 4% 103 glue, 103A glue mixture, 2% electrically conductive graphite, 4% SP;
Negative material comprises: 93% graphite C, 4% 105 glue, 3% superconduction carbon black.
Concrete preparation method is as follows for lithium ion battery:
1) making of positive plate: by formula ratio, add positive electrode, adding pure water dissolves, even by double-planet power mixer high-speed stirred, eliminate bubble, iron filings, anode sizing agent, anode sizing agent is uniformly coated on aluminium foil through automatical feeding system, coating machine, under-0.08MPa, 80 ℃ of bakings, after 12 hours, roll-in, cut into positive plate;
2) making of negative plate: by formula ratio, add negative material, adding pure water dissolves, even by double-planet power mixer high-speed stirred, eliminate bubble, iron filings, cathode size, cathode size is uniformly coated on Copper Foil through automatical feeding system, coating machine, under-0.08MPa, 80 ℃ of bakings, after 12 hours, roll-in, cut into negative plate;
3) respectively the 70 ℃ of bakings under-0.08MPa of positive plate, negative plate, after 36 hours, are laminated into to battery core by positive plate, barrier film, negative plate;
4) battery core is loaded in battery container, through the lower 70 ℃ of bakings of-0.08MPa after 72 hours, fluid injection, changes into partial volume and makes the 100Ah battery.
Positive electrode comprises: 91% phosphoric acid vanadium lithium, 5% 105 glue, 4% carbon nano-tube;
Negative material comprises: 95% graphite C, 3% 105 glue, 105A glue mixture, 2% carbon nano-tube.
Concrete preparation method is as follows for lithium ion battery:
1) making of positive plate: by formula ratio, add positive electrode, adding pure water dissolves, even by double-planet power mixer high-speed stirred, eliminate bubble, iron filings, anode sizing agent, anode sizing agent is uniformly coated on aluminium foil through automatical feeding system, coating machine, under-0.10MPa, 120 ℃ of bakings, after 6 hours, roll-in, cut into positive plate;
2) making of negative plate: by formula ratio, add negative material, adding pure water dissolves, even by double-planet power mixer high-speed stirred, eliminate bubble, iron filings, cathode size, cathode size is uniformly coated on Copper Foil through automatical feeding system, coating machine, under-0.10MPa, 120 ℃ of bakings, after 6 hours, roll-in, cut into negative plate;
3) respectively the 100 ℃ of bakings under-0.10MPa of positive plate, negative plate, after 24 hours, are laminated into to battery core by positive plate, barrier film, negative plate;
4) battery core is loaded in battery container, through the lower 100 ℃ of bakings of-0.10MPa after 60 hours, fluid injection, changes into partial volume and makes the 100Ah battery.
Embodiment 4
Positive electrode comprises: 91% phosphoric acid vanadium lithium, 4% 105 glue, 105A glue mixture, 2% electrically conductive graphite, 3% carbon nano-tube;
Negative material comprises: 95% graphite C, 2% 105 glue, 105A glue mixture, 3% SP.
Concrete preparation method is as follows for lithium ion battery:
1) making of positive plate: by formula ratio, add positive electrode, adding pure water dissolves, even by double-planet power mixer high-speed stirred, eliminate bubble, iron filings, anode sizing agent, anode sizing agent is uniformly coated on aluminium foil through automatical feeding system, coating machine, under-0.07MPa, 110 ℃ of bakings, after 7 hours, roll-in, cut into positive plate;
2) making of negative plate: by formula ratio, add negative material, adding pure water dissolves, even by double-planet power mixer high-speed stirred, eliminate bubble, iron filings, cathode size, cathode size is uniformly coated on Copper Foil through automatical feeding system, coating machine, under-0.07MPa, 110 ℃ of bakings, after 7 hours, roll-in, cut into negative plate;
3) respectively the 90 ℃ of bakings under-0.07MPa of positive plate, negative plate, after 30 hours, are laminated into to battery core by positive plate, barrier film, negative plate;
4) battery core is loaded in battery container, through the lower 90 ℃ of bakings of-0.07MPa after 66 hours, fluid injection, changes into partial volume and makes the 100Ah battery.
Claims (6)
1. a phosphoric acid vanadium lithium and graphite C system lithium ion battery, its positive electrode is comprised of phosphoric acid vanadium lithium 85%-95%, aqueous binder 1%-10%, conductive agent 1%-10%, and its negative material is comprised of graphite C 85%-95%, aqueous binder 1%-10%, conductive agent 1%-10%; Wherein, percentage is mass percent.
2. a kind of phosphoric acid vanadium lithium according to claim 1 and graphite C system lithium ion battery, it is characterized in that: described aqueous binder is at least one in 103 glue, 103A glue, 105 glue, 105A glue.
3. a kind of phosphoric acid vanadium lithium according to claim 1 and graphite C system lithium ion battery, it is characterized in that: described conductive agent is at least one in SP, electrically conductive graphite, superconduction carbon black, carbon nano-tube.
4. the preparation method of a kind of phosphoric acid vanadium lithium according to claim 1 and graphite C system lithium ion battery, comprise the steps:
1) making of positive plate: positive electrode claimed in claim 1 is dissolved in pure water, obtains anode sizing agent after high-speed stirred, anode sizing agent is coated on aluminium foil uniformly, aluminium foil is after vacuum bakeout 6-12 hour, and positive plate is pressed, cut into to rod;
2) making of negative plate: negative material claimed in claim 1 is dissolved in pure water, after high-speed stirred cathode size, cathode size is coated on Copper Foil uniformly, Copper Foil, after vacuum bakeout 6-12 hour, roll extrusion, cuts into negative plate;
3) positive and negative plate after vacuum bakeout 24-48 hour, is laminated into battery core by positive plate, barrier film, negative plate respectively;
4) battery core is loaded in battery container, after vacuum bakeout 48-96 hour, fluid injection, changes into partial volume and makes lithium ion battery.
5. the preparation method of lithium ion battery according to claim 5 is characterised in that: described vacuum pressure is-0.07～-0.1MPa.
6. the preparation method of lithium ion battery according to claim 5, be characterised in that: described baking temperature is 70～120 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711641A (en) * | 2018-08-29 | 2018-10-26 | 深圳易新能源科技有限公司 | The production method of pure tertiary cathode material battery core |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101626099A (en) * | 2009-08-08 | 2010-01-13 | 东莞市迈科科技有限公司 | Polymer vanadium lithium phosphate power battery and preparation method thereof |
| CN102299339A (en) * | 2011-08-03 | 2011-12-28 | 珠海锂源动力科技有限公司 | Lithium titanate and lithium vanadium phosphate lithium ion battery and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101626099A (en) * | 2009-08-08 | 2010-01-13 | 东莞市迈科科技有限公司 | Polymer vanadium lithium phosphate power battery and preparation method thereof |
| CN102299339A (en) * | 2011-08-03 | 2011-12-28 | 珠海锂源动力科技有限公司 | Lithium titanate and lithium vanadium phosphate lithium ion battery and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711641A (en) * | 2018-08-29 | 2018-10-26 | 深圳易新能源科技有限公司 | The production method of pure tertiary cathode material battery core |
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Application publication date: 20131225 |