CN109585907A - Three electrode lithium ion batteries and preparation method thereof - Google Patents
Three electrode lithium ion batteries and preparation method thereof Download PDFInfo
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- CN109585907A CN109585907A CN201811437251.0A CN201811437251A CN109585907A CN 109585907 A CN109585907 A CN 109585907A CN 201811437251 A CN201811437251 A CN 201811437251A CN 109585907 A CN109585907 A CN 109585907A
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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
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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
- H01M10/058—Construction or manufacture
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- 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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- 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
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Abstract
The invention proposes a kind of three electrode lithium ion batteries and preparation method thereof, wherein the reference electrode of three electrode lithium ion batteries is LiFePO4 pole piece, LiFePO 4 material is stablized, not oxidizable under air, need not carry out in glove box as reference electrode；LiFePO4 is low in cost compared to three electrode materials of noble metals such as metal platinums；LiFePO4 polarization curve approximation vertical line, as reference electrode, current potential is more stable, and measuring accuracy is higher.
Description
Technical field
The present invention relates to field of lithium ion battery, especially relate to three electrode lithium ion batteries of one kind and its production side
Method.
Background technique
Also more and more deep to the research of battery with the development of lithium ion battery industry, normal lithium ion battery is only
The whole chemical property that battery can be studied is not able to satisfy the independent research to battery positive and negative electrode, therefore just needs to introduce third
Electrode, i.e. reference electrode individually study the positive and negative electrode performance of battery.The reference electrode of existing lithium ion battery
Material is essentially all copper, lithium, stainless steel or platinum, but copper and stainless steel can disturb electric signal, influences measuring accuracy, and lithium holds
Oxidizable, operating procedure is complicated, and platinum is then higher cost.Still lack a kind of both stable testings at present, precision is high, and operates letter
It is single, low-cost three electrodes lithium ion battery.
Summary of the invention
The main object of the present invention is to provide three electrode lithium ion batteries of one kind and preparation method thereof, to provide a kind of i.e. survey
Examination is stablized, and precision is high, and easy to operate, low-cost three electrodes lithium ion battery.
The present invention proposes a kind of three electrode lithium ion batteries, which is characterized in that including battery case, diaphragm, battery electrolysis
Liquid, anode, cathode, copper wire and LiFePO4 pole piece；
Battery electrolyte is sealed in battery case, and anode, cathode, copper wire and LiFePO4 pole piece are all infiltrated in battery electricity
It solves in liquid；Be isolated between positive electrode and negative electrode by diaphragm, both copper wire and LiFePO4 pole piece between anode and with cathode it
Between be all isolated by diaphragm, copper wire and LiFePO4 pole piece interval are arranged；Copper wire surface is coated with lithium layer；Anode, cathode, copper wire, phosphorus
Sour iron pole piece is corresponded with positive pole ear, negative lug, the first tab and the second tab outside battery case respectively to be connected
It connects.
Further, copper wire surface is coated with lithium layer.
Further, the length of LiFePO4 pole piece is the 1/2~2/3 of the length of positive or negative pole.
Further, the width of LiFePO4 pole piece is 1~5mm.
Further, copper wire is infiltrated on the part in battery electrolyte as part plating lithium, and rest part is enameled wire.
Further, the second tab is aluminium pole ears.
Further, the first tab is copper wire enameled wire.
Further, copper wire and LiFePO4 pole piece are fixed on diaphragm by high temperature gummed tape.
The invention also provides a kind of production methods of three electrode lithium ion batteries, for making the three of above-mentioned any one
Electrode lithium ion battery, comprising:
Anode, cathode, copper wire, LiFePO4 pole piece and diaphragm are encapsulated in battery case, and respectively with positive pole ear,
Negative lug, the first tab and the second tab connect one to one；
Battery electrolyte is filled in battery case, three electrode lithium ion batteries are obtained.
Further, it is encapsulated in battery case by anode, cathode, copper wire, LiFePO4 pole piece and diaphragm, and respectively
Before the step of connecting one to one with positive pole ear, negative lug, the first tab and the second tab, further includes:
Enameled wire copper wire is handled, enameled wire copper wire partial denudation, and the exposed portion of acidification enameled wire copper wire are made
The surface oxide layer divided obtains copper wire.
Further, it is encapsulated in battery case by anode, cathode, copper wire, LiFePO4 pole piece and diaphragm, and respectively
Before the step of connecting one to one with positive pole ear, negative lug, the first tab and the second tab, further includes:
After ferric phosphate lithium piece is rinsed, dried, required shape size is intercepted, obtains LiFePO4 pole piece.
Compared with prior art, the present invention beneficial effect is: the invention proposes a kind of three electrode lithium ion batteries and its
Production method, wherein the reference electrode of three electrode lithium ion batteries is LiFePO4 pole piece, LiFePO 4 material is stablized, in air
Under it is not oxidizable, need not be carried out in glove box as reference electrode；LiFePO4 is compared to three electrode materials of noble metals such as metal platinums
Material, it is low in cost；LiFePO4 polarization curve approximation vertical line, as reference electrode, current potential is more stable, and measuring accuracy is higher.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of three electrode lithium ion battery of the invention, one embodiment；
Fig. 2 is 1C charging/discharging voltage-time plot under the room temperature of three electrode lithium ion battery of the invention, one embodiment；
Fig. 3 is 1.5C charging/discharging voltage-time plot under the room temperature of three electrode lithium ion battery of the invention, one embodiment；
Fig. 4 is 1C charging/discharging voltage-time plot at 0 DEG C of three electrode lithium ion battery of the invention, one embodiment；
Fig. 5 is the step schematic diagram of one embodiment of production method of three electrode lithium ion batteries of the invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should
When particular pose changes, then directionality instruction also correspondingly changes correspondingly, and the connection, which can be, to be directly connected to,
It can be and be indirectly connected with.
In addition, the description for being such as related to " first ", " second " in the present invention is used for description purposes only, and should not be understood as
Its relative importance of indication or suggestion or the quantity for implicitly indicating indicated technical characteristic.Define as a result, " first ",
The feature of " second " can explicitly or implicitly include at least one of the features.In addition, the technical side between each embodiment
Case can be combined with each other, but must be based on can be realized by those of ordinary skill in the art, when the combination of technical solution
Conflicting or cannot achieve when occur will be understood that the combination of this technical solution is not present, also not the present invention claims guarantor
Within the scope of shield.
Referring to Fig.1, one embodiment of the invention proposes a kind of three electrode lithium ion batteries, including battery case 3, diaphragm,
Battery electrolyte, anode, cathode, copper wire 6 and LiFePO4 pole piece 4；Battery electrolyte is sealed in battery case 3, positive, negative
Pole, copper wire 6 and LiFePO4 pole piece 4 all infiltrate in battery electrolyte；It is isolated between positive electrode and negative electrode by diaphragm, copper wire 6, phosphorus
Both sour iron pole pieces 4 are isolated, in some embodiments, copper wire 6 and phosphorus between anode and between cathode by diaphragm
Sour iron pole piece 4 with diaphragm therebetween without being isolated, as long as will not directly contact with each other, interval setting.It is positive, negative
Pole, copper wire 6, LiFePO4 pole piece 4 respectively with positive pole ear 1, negative lug 5, the first tab 2 and outside battery case 3
Two tabs 7 connect one to one, and when so as to the subsequent anode to battery or cathode progress testing research, can pass through positive pole
Ear 1, negative lug 5, the first tab 7 and the second tab 2 are directly connected to anode, cathode, copper wire 6 and LiFePO4 pole piece 4, from
And achieve the purpose that individually to test the anode or cathode of battery.
The three electrode Li-ion batteries piles using LiFePO4 pole piece 4 as reference electrode install finish after, in making usually
The normal use that three electrode lithium ion batteries are had no effect on copper wire 6 in the process, only when needing to carry out relevant test,
The surface of copper wire 6 is needed to be coated with lithium layer.It in some embodiments, can when being packaged production to three electrode lithium ion batteries
Using the copper wire 6 for having plated lithium layer, use is directly directly brought when needing to test behind.In other embodiments
In, when being packaged production to three electrode lithium ion batteries, 6 surface of copper wire does not have lithium layer, therefore need before test into
Row plating lithium with anode, cathode is taken up in order of priority copper wire 6 to connect, a lithium is electroplated respectively, it is ensured that copper wire is completely by lithium metal packet
It covers.Then three electrode lithium ion batteries are tested for the property.
As shown in Fig. 2, the voltage-time curve to discharge under its 1C capacity is tested at normal temperature, to test its room temperature performance,
And to using copper wire 6 as reference electrode three electrode lithium ion batteries and full battery carry out corresponding contrast test, wherein curve A
What is represented is full battery current potential, and what curve B was represented is current potential of the cathode to 4 electrode of LiFePO4 pole piece, and what curve C was represented is yin
Extremely to the current potential of 6 electrode of copper wire, what curve D was represented is current potential of the anode to 4 electrode of LiFePO4 pole piece, and what curve E was represented is
Current potential of the anode to 6 electrode of copper wire.Test data such as Tables 1 and 2, wherein what table 1 was recorded is the test number in Fig. 2 in box F
According to what table 2 was recorded is the data that all curves correspond to the testing time in box F in Fig. 2；Data can obtain from table 1, with copper wire 6
Make the cathode potential measured when three electrodes the phenomenon that discharge regime appearance potential declines, and makees three electricity with LiFePO4 pole piece 4
Cathode potential persistently increases when pole, but as known from Table 2, in entire discharge regime, makees three electrodes or copper wire with LiFePO4 pole piece 4
6 potential differences for making three-electrode battery positive and negative anodes are consistent with cell voltage.Therefore made at normal temperature with LiFePO4 pole piece 4
Test data is all normal when three electrodes or copper wire 6 make three electrode tests and effect is not much different.
As shown in figure 3, testing the three electrode lithium ion batteries using LiFePO4 pole piece 4 as reference electrode at normal temperature
Voltage-time curve under 1.5C capacity, to test its high rate performance, and to the three electrode lithiums using copper wire 6 as reference electrode
Ion battery and full battery carry out corresponding contrast test, and test data such as table 3 and table 4, what wherein table 3 was recorded is side in Fig. 3
Test data in frame G, represent be battery discharge test before standing the stage test data, table 4 record the side of being
Test data in frame H, what is represented is the test data in the standing stage after battery discharge test；As known from Table 3, it is testing
The preceding standing stage, it is larger to stand front and back positive and negative anodes potential change rate when making three electrodes with copper wire 6, and with the work of LiFePO4 pole piece 4
Positive and negative electrode potential is more stable when three electrodes, and potential change rate is smaller, while with positive and negative anodes electricity when three electrode of work of LiFePO4 pole piece 4
It is also smaller to stand stage potential change rate closer to cell voltage for potential difference.As known from Table 4, terminate the standing stage in electric discharge, with phosphorus
It is always consistent that sour iron pole piece 4 makees positive and negative anodes potential difference and cell voltage before and after three electrodes are stood, and makees three electricity with copper wire 6
When pole, positive and negative anodes potential difference and cell voltage have different, and difference is increasing.Therefore under high magnification, relative to copper
Silk 6 makees three electrodes, and test result when being tested with the three electrode lithium ion batteries that LiFePO4 pole piece 4 makees three electrodes is more acurrate,
Effect is more preferable.
As shown in figure 4, three electrode lithium ion batteries of the test using LiFePO4 pole piece 4 as reference electrode at 0 DEG C
Voltage-time curve, to test its cryogenic property, and to the three electrode lithium ion batteries using copper wire 6 as reference electrode and entirely
Battery carries out corresponding contrast test, and test data such as table 5 and table 6, wherein what table 5 was recorded is the test data in box I,
What is represented is the test data of low temperature constant voltage charging phase, and what table 6 was recorded is the test data in box J, and what is represented is full
The test data in charge and discharge stage.As known from Table 5, in low temperature constant voltage charging phase, when making three electrodes with LiFePO4 pole piece 4 just
Cathode potential remains unchanged, and positive and negative anodes potential difference and cell voltage are always consistent；And when making three electrodes with copper wire 6, just
Cathode potential is constantly reducing, and positive and negative anodes potential difference and cell voltage are inconsistent, and gap has increase tendency；It can from table 6
Know, in the full charge and discharge stage, making the cathode potential that three electrodes measure with copper wire 6 is to reduce, positive and negative anodes potential difference and battery electricity
Cathode potential is to increase when pressing inconsistent and gap increasing, and making three electrodes with LiFePO4 pole piece 4, positive and negative anodes potential difference
It is closer with cell voltage, and difference has reduction trend.Therefore at low temperature, make three electrodes relative to copper wire 6, use ferric phosphate
Test result when the three electrode lithium ion batteries that pole piece 4 makees three electrodes are tested is more acurrate, and effect is more preferable.
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
The invention proposes a kind of three electrode lithium ion batteries, reference electrode is LiFePO4 pole piece 4, LiFePO4 material
Material is stablized, not oxidizable under air, need not carry out in glove box as reference electrode；LiFePO4 is expensive compared to metal platinum etc.
Three electrode material of metal, it is low in cost；LiFePO4 polarization curve approximation vertical line, as reference electrode, current potential is more stable, test
Precision is higher.
In some embodiments, the length of LiFePO4 pole piece 4 is the 1/2~2/3 of the length of positive or negative pole, about phosphorus
The length of sour iron pole piece 4, the position that on the one hand meet among one end insertion battery core pole piece of LiFePO4 pole piece 4 are another simultaneously
One end can also leak out pole volume and be attached with outside, on the other hand have LiFePO4 pole piece during making battery
The power that is fabricated to of battery can be improved in the risk of 4 extractions, length long enough, therefore through overtesting, selects LiFePO4 pole piece 4
Length is the 1/2~2/3 of the length of positive or negative pole, so that LiFePO4 pole piece 4 can either leak out pole volume and be connected with outside
It connects, and is able to maintain that stabilization, reduce extracted risk.
In some embodiments, the width of LiFePO4 pole piece 4 is 1~5mm, about the width of LiFePO4 pole piece 4, by
Typically small in the volume of lithium-ion battery monomer, the width of LiFePO4 pole piece 4 is too wide to hinder battery during the test
The transmission of lithium ion influences test result, and the too narrow then pole piece frangibility of the width of LiFePO4 pole piece 4 is not easy to operate, therefore passes through
Overtesting selects the width of LiFePO4 pole piece 4 for 1~5mm, so that LiFePO4 pole piece 4 both will not interfere battery testing
The transmission of lithium ion in the process, and there is enough robustnesses, it is easily operated.
In some embodiments, copper wire 6 is infiltrated on the part in battery electrolyte as part plating lithium, and rest part is enamel-cover
Line, since exposed copper wire 6 in the electrolytic solution can interfere electric signal, but copper wire 6 is as reference electrode necessary exposed one
Part is for plating lithium, so only exposed sub-fraction, rest part are still enameled wires to copper wire 6 in order to improve measuring accuracy, with
Guarantee that the rest part of copper wire 6 will not influence and leads measuring accuracy.
In some embodiments, LiFePO4 pole piece 4 exports to the outside of battery case 3 by the connection of the second tab 2, the
The material of two tabs 2 is aluminium, LiFePO4 pole piece 4 is exported to using aluminium pole ears the outside of battery case 3, is primarily due to phosphorus
Sour iron pole piece 4 is more crisp, directly contacts LiFePO4 pole piece 4 in production and later period test process in order to prevent and causes pole piece
Fracture damages LiFePO4 pole piece 4, therefore 4 one end of LiFePO4 pole piece is placed in inside battery core, one end and the second tab 2
It is connected, the second tab 2 exports outside battery core, convenient for test.
In some embodiments, the material of the first tab 7 is copper wire enameled wire, i.e., is infiltrated on battery electrolyte with copper wire 6
In do not plate lithium part material it is identical, in production, it is only necessary to directly in enameled wire copper wire partial encapsulation and battery case 3
Portion, and using the part outside stretching battery case 3 as the first tab 7, without additional setting tab, make simple side
Just.
In some embodiments, copper wire 6 and LiFePO4 pole piece 4 are fixed on diaphragm by high temperature gummed tape, in order to reduce
The risk for loosening and contacting with each other because of displacement occurs for copper wire 6 and LiFePO4 pole piece 4, using high temperature gummed tape by copper wire 6
It is fixed on diaphragm with LiFePO4 pole piece 4, keeps test more stable.
The invention proposes a kind of three electrode lithium ion batteries, reference electrode is LiFePO4 pole piece, LiFePO4 material
Material is stablized, not oxidizable under air, need not carry out in glove box as reference electrode；LiFePO4 is expensive compared to metal platinum etc.
Three electrode material of metal, it is low in cost；LiFePO4 polarization curve approximation vertical line, as reference electrode, current potential is more stable, test
Precision is higher.
Referring to Fig. 5, the production method that also proposed a kind of three electrode lithium ion batteries in one embodiment of the invention, for making
Make three any one of above-mentioned electrode lithium ion batteries, comprising:
S1: anode, cathode, copper wire, LiFePO4 pole piece and diaphragm are encapsulated in battery case, and respectively with positive pole
Ear, negative lug, the first tab and the second tab connect one to one；
S2: battery electrolyte is filled in battery case, obtains three electrode lithium ion batteries.
Anode, cathode, copper wire, LiFePO4 pole piece and diaphragm are encapsulated in battery case above-mentioned, and respectively and just
In the step S1 that pole tab, negative lug, the first tab and the second tab connect one to one, in some embodiments, use
Copper wire and LiFePO4 pole piece will be isolated between anode and cathode for diaphragm, prevent it from interfering with each other in battery electrolyte,
And copper wire and LiFePO4 pole piece are not necessarily to be isolated with diaphragm therebetween, as long as will not directly contact with each other.It will be positive, negative
Pole, copper wire, LiFePO4 pole piece connect one to one with positive pole ear, negative lug, the first tab and the second tab respectively, make
Positive, cathode, copper wire and LiFePO4 pole piece export to outside from the inside of battery case respectively, so as to subsequent to battery
When anode or cathode carry out testing research, battery case can be exported to by anode, cathode, copper wire and LiFePO4 pole piece
External part directly connects, to achieve the purpose that individually to test the anode or cathode of battery.
Battery electrolyte is filled in battery case above-mentioned, is obtained in the step S2 of three electrode lithium ion batteries, three
The hardware configuration of electrode lithium ion battery after setting completed, battery electrolyte is filled in the battery case so that anode, cathode,
Copper wire and LiFePO4 pole piece all infiltrate in battery electrolyte, can carry out electronics by battery electrolyte between each other and turn
It moves, completes battery work and its performance study.In some embodiments, after battery electrolyte filling finishes, it is also necessary to right
The current potential of LiFePO4 pole piece carries out test determination, so that subsequent anode, cathode to battery carries out independent testing research.True
When determining the current potential of LiFePO4 pole piece, battery detecting cabinet anode is electrically connected with LiFePO4 pole piece, battery detecting cabinet cathode with
Copper wire electrical connection, LiFePO4 pole piece is as anode at this time, and for copper wire as cathode, testing shown voltage is exactly LiFePO4
The current potential of pole piece.Then the current potential for the LiFePO4 pole piece that test obtains is recorded, to be used as ginseng in follow-up study
Examine current potential.
In some embodiments, it is encapsulated in battery case by anode, cathode, copper wire, LiFePO4 pole piece and diaphragm,
And before the step S1 to connect one to one respectively with positive pole ear, negative lug, the first tab and the second tab, further includes:
S01: handling enameled wire copper wire, makes enameled wire copper wire partial denudation, and acidification enameled wire copper wire is naked
Reveal the surface oxide layer of part, obtains copper wire.
Enameled wire copper wire is handled above-mentioned, makes enameled wire copper wire partial denudation, and acidification enameled wire copper wire
The surface oxide layer of exposed part obtains in the step S01 of copper wire, if the copper wire directly exposed meeting in lithium-ion battery electrolytes
Electric signal is interfered, so that measuring accuracy reduces, but copper wire is as reference electrode necessary exposed a part again, therefore to it
Exposed part carries out plating lithium, and it is zero that copper wire, which plates current potential of the lithium later in lithium-ion battery electrolytes,.Copper wire exposed part is general
All there is surface oxide layer, surface oxide layer is likely to occur reaction in battery electrolyte, to influence measuring accuracy, therefore
It needs to carry out acidification to copper wire exposed part, to remove surface oxide layer.
In some embodiments, it is encapsulated in battery case by anode, cathode, copper wire, LiFePO4 pole piece and diaphragm,
And before the step S1 to connect one to one respectively with positive pole ear, negative lug, the first tab and the second tab, further includes:
S02: after ferric phosphate lithium piece is rinsed, dried, required shape size is intercepted, obtains LiFePO4 pole piece.
It is above-mentioned ferric phosphate lithium piece is rinsed, is dried after, intercept required shape size, obtain LiFePO4 pole piece
Step S02 in, ferric phosphate lithium piece is first rinsed with dimethyl carbonate, it is that may be present to remove ferric phosphate lithium piece surface
Impurity, then rinsed with distilled water, remaining dimethyl carbonate is removed, is then placed in high temperature oven and dries, is finally intercepted
Required shape size obtains LiFePO4 pole piece.
The invention proposes a kind of production methods of three electrode lithium ion batteries, comprising: S1: by anode, cathode, copper wire,
LiFePO4 pole piece and diaphragm are encapsulated in battery case, and respectively with positive pole ear, negative lug, the first tab and the second pole
Ear connects one to one；S2: battery electrolyte is filled in battery case, obtains three electrode lithium ion batteries.Three electrode lithiums
The reference electrode of ion battery is LiFePO4 pole piece, and LiFePO 4 material is stablized, not oxidizable under air, as reference electricity
Pole need not carry out in glove box；LiFePO4 is low in cost compared to three electrode materials of noble metals such as metal platinums；Ferric phosphate lithium electrode
Change curve approximation vertical line, as reference electrode, current potential is more stable, and measuring accuracy is higher.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all utilizations
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content is applied directly or indirectly in other correlations
Technical field, be included within the scope of the present invention.
Claims (10)
1. a kind of three electrode lithium ion batteries, which is characterized in that including battery case, diaphragm, battery electrolyte, anode, cathode,
Copper wire and LiFePO4 pole piece；
The battery electrolyte is sealed in the battery case, the anode, the cathode, the copper wire and the ferric phosphate
Pole piece all infiltrates in the battery electrolyte；The anode is isolated between the cathode by the diaphragm, the copper wire
All it is isolated by the diaphragm between both LiFePO4 pole pieces and the anode and between the cathode, the copper
Silk is arranged with LiFePO4 pole piece interval；The anode, the cathode, the copper wire, LiFePO4 pole piece difference
It connects one to one with positive pole ear, negative lug, the first tab and the second tab outside the battery case.
2. three electrodes lithium ion battery according to claim 1, which is characterized in that the copper wire surface is coated with lithium layer.
3. three electrodes lithium ion battery according to claim 1, which is characterized in that the length of the LiFePO4 pole piece is
The 1/2~2/3 of the length of the anode or the cathode.
4. three electrodes lithium ion battery according to claim 1, which is characterized in that the copper wire is infiltrated on the battery electricity
Solving the part in liquid is part plating lithium, and rest part is enameled wire.
5. three electrodes lithium ion battery according to claim 1, which is characterized in that second tab is aluminium pole ears.
6. three electrodes lithium ion battery according to claim 1, which is characterized in that first tab is copper wire enamel-cover
Line.
7. three electrodes lithium ion battery according to claim 1, which is characterized in that the copper wire and the ferric phosphate lithium electrode
Piece is fixed on the diaphragm by high temperature gummed tape.
8. a kind of production method of three electrode lithium ion batteries, which is characterized in that for making claim 1-7 any one institute
The three electrode lithium ion batteries stated, comprising:
The anode, the cathode, the copper wire, the LiFePO4 pole piece and the diaphragm are encapsulated in the battery case
It is interior, and connect one to one respectively with the positive pole ear, the negative lug, first tab and second tab；
The battery electrolyte is filled in the battery case, the three electrodes lithium ion battery is obtained.
9. the production method of three electrodes lithium ion battery according to claim 8, which is characterized in that it is described by it is described just
Pole, the cathode, the copper wire, the LiFePO4 pole piece and the diaphragm are encapsulated in the battery case, and respectively with
Before the step of positive pole ear, the negative lug, first tab and second tab connect one to one, also
Include:
Enameled wire copper wire is handled, makes the enameled wire copper wire partial denudation, and enameled wire copper wire described in acidification is naked
The surface oxide layer for revealing part, obtains the copper wire.
10. the production method of three electrodes lithium ion battery according to claim 8, which is characterized in that it is described will be described
Positive, the described cathode, the copper wire, the LiFePO4 pole piece and the diaphragm are encapsulated in the battery case, and respectively
Before the step of connecting one to one with the positive pole ear, the negative lug, first tab and second tab,
Further include:
After ferric phosphate lithium piece is rinsed, dried, required shape size is intercepted, obtains the LiFePO4 pole piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811437251.0A CN109585907A (en) | 2018-11-28 | 2018-11-28 | Three electrode lithium ion batteries and preparation method thereof |
Applications Claiming Priority (1)
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| CN110797569A (en) * | 2019-10-31 | 2020-02-14 | 深圳新恒业电池科技有限公司 | Four-electrode lithium ion battery and potential measuring method thereof |
| CN112526357A (en) * | 2020-11-25 | 2021-03-19 | 上海空间电源研究所 | Lithium ion battery power matching performance evaluation method |
| CN113422115A (en) * | 2021-07-02 | 2021-09-21 | 广州小鹏汽车科技有限公司 | Lithium ion battery cell, preparation method of lithium ion battery cell and lithium analysis detection method |
| WO2022056787A1 (en) * | 2020-09-17 | 2022-03-24 | 华为数字能源技术有限公司 | Three-electrode battery and energy storage system |
| CN114497693A (en) * | 2021-12-27 | 2022-05-13 | 国联汽车动力电池研究院有限责任公司 | Preparation method of three-electrode battery and lithium precipitation testing method thereof |
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