CN106707024A - Test sample used for testing relative internal resistance of electrode material and test method used for testing relative internal resistance of electrode material - Google Patents
Test sample used for testing relative internal resistance of electrode material and test method used for testing relative internal resistance of electrode material Download PDFInfo
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- CN106707024A CN106707024A CN201510788136.8A CN201510788136A CN106707024A CN 106707024 A CN106707024 A CN 106707024A CN 201510788136 A CN201510788136 A CN 201510788136A CN 106707024 A CN106707024 A CN 106707024A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The invention discloses a test sample used for testing the relative internal resistance of an electrode material and a testing method used for testing the relative internal resistance of an electrode material. The test sample comprises an insulating diaphragm and two pole pieces fixed at two sides of the insulating diaphragm respectively, wherein each pole piece comprises an electrode material layer arranged in a mode of being attached to the insulating diaphragm and a current collector layer located at the outer side. By applying the test sample used for testing the relative internal resistance of the electrode material and the test method used for testing the relative internal resistance of the electrode material, no complex battery manufacturing equipment is required, and a time-consuming battery manufacturing process is not required either, so that a lot of labor cost and material cost can be saved. In addition, the two pole pieces are set to be identical pole pieces, so that ohmic internal resistance of the positive electrode or the negative electrode can be acquired directly, and analysis for composition of the internal resistance of a battery is facilitated.
Description
Technical field
The present invention relates to battery material technical field, in particular it relates to a kind of for testing electrode material phase
Test sample to internal resistance and the method for testing for testing the relative internal resistance of electrode material.
Background technology
In recent years, lithium rechargeable battery is rapidly developed, in communication, portable electric appts, storage
Energy power station, electric motor car etc. suffer from widely applying, and are one of new Main ways of green energy resource development.
Internal resistance has important influence to battery as one of the key technical index of lithium rechargeable battery,
Its rate charge-discharge performance, cycle performance, charge-discharge energy conversion efficiency and security performance etc. are had influence on,
Based on this kind of reason, major producers all attach great importance to the internal resistance of cell.Lithium ion battery internal resistance is constituted
Complexity, is divided into ohmic internal resistance and polarization resistance.At present, main test is ohmic internal resistance, and it is by electricity
The contact resistance composition of pole material, electrolyte, the resistance of barrier film and battery each several part part.
The test internal resistance of cell is tested by special battery Inner Resistance Tester in Virtual Instrument device at present, is being surveyed
Complete full battery will be made before examination, whole fabrication cycle is very long, and cost is higher, and survey
It is the internal resistance of whole battery, it is impossible to individually test ohmic internal resistance caused by positive electrode or negative material.
And the polarization resistance of positive and negative pole material can carry out ac impedance measurement acquisition by assembling button cell respectively.
Therefore, develop a kind of method that can quickly test electrode both positive and negative polarity internal resistance and seem particularly necessary.
The content of the invention
It is an object of the invention to provide it is a kind of for test electrode material with respect to internal resistance test sample and
For testing method of testing of the electrode material with respect to internal resistance, to provide one kind, can quickly to test electrode positive and negative
Extremely with respect to the method for internal resistance.
To achieve these goals, provide a kind of for testing electrode material with respect to internal resistance in the present invention
Test sample, the test sample includes insulation diaphragm and is fixed on two poles of the insulation diaphragm both sides
Piece, the pole piece includes being affixed with the insulation diaphragm electrode material layer and the collection positioned at outside of setting
Fluid layer.
Meanwhile, a kind of method of testing for testing the relative internal resistance of electrode material is additionally provided in the present invention,
The method of testing is comprised the following steps：S1, control electrode material and electrode material to be measured are taken respectively, will
Both prepare test sample at identical conditions, each test sample include respectively insulation diaphragm and
Two pole pieces of the insulation diaphragm both sides are fixed on, the pole piece includes mutually being sticked with the insulation diaphragm
The electrode material layer put and the current collector layers positioned at outside；S2, using identical internal resistance test device in phase
In same electrolyte, the test sample containing control electrode material is measured respectively and contains electrode material to be measured
The internal resistance value of the test sample of material, you can learn the relative internal resistance of the electrode material to be measured.
Using the present invention for testing electrode material with respect to the test sample of internal resistance and for testing electrode
Method of testing of the material with respect to internal resistance, it is not necessary to complicated battery making apparatus, it is not necessary to time-consuming more long
Battery Making programme, substantial amounts of can save labour cost and Master Cost；And, the method passes through will
Two pole pieces are set to identical pole piece can directly obtain the ohmic internal resistance of negative or positive electrode, be easy to analysis electricity
The internal resistance composition in pond.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is, for providing a further understanding of the present invention, and to constitute the part of specification, with
Following specific embodiment is used to explain the present invention together, but is not construed as limiting the invention.
In accompanying drawing：
Fig. 1 is shown according to an embodiment of the present invention for testing test of the electrode material with respect to internal resistance
The structural representation of pole piece in sample；
Fig. 2 is shown according to an embodiment of the present invention for testing test of the electrode material with respect to internal resistance
The structural representation of sample；
Fig. 3 is shown according to another kind embodiment of the invention for testing survey of the electrode material with respect to internal resistance
The structural representation of test agent.
Description of reference numerals
The pole piece of 10 insulation diaphragm 20
The current collector layers of 21 electrode material layer 22
The composite of 23 lug 30
40 insulation rolls are around rod
Specific embodiment
Specific embodiment of the invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that
Specific embodiment described herein is merely to illustrate and explain the present invention, and is not intended to limit the invention.
In the present invention term " electrode material " refer to for battery realize discharge and recharge " positive electrode and/or
The general designation of negative material ", those skilled in the art can clearly know this by the understanding to battery
The effect of " positive electrode and/or negative material " and optional raw material are planted, be will not be repeated here.
The present inventor enters to develop a kind of method that can quickly test electrode both positive and negative polarity internal resistance
Gone substantial amounts of research experiment, and propose it is a kind of for testing test sample of the electrode material with respect to internal resistance,
As depicted in figs. 1 and 2, the test sample includes insulation diaphragm 10 and is fixed on the insulation diaphragm
Two pole pieces 20 of 10 both sides, the pole piece 20 includes being affixed with the insulation diaphragm 10 electricity of setting
Pole material layer 21 and the current collector layers 22 positioned at outside.
It is provided by the present invention this for testing test sample of the electrode material with respect to internal resistance, it is not necessary to multiple
Miscellaneous battery making apparatus, it is not necessary to time-consuming battery Making programme more long, substantial amounts of can save artificial
Expense and Master Cost, and it is provided by the present invention this for testing survey of the electrode material with respect to internal resistance
The test environment of test agent is simple, it is only necessary to places and just can quickly be surveyed using internal resistance test device in electrolyte
Examination electrode both positive and negative polarity internal resistance.
It is above-mentioned for testing test sample of the electrode material with respect to internal resistance according to the present invention, it is fixed on described exhausted
It is negative that two pole pieces 20 of the both sides of edge barrier film 10 can be made an anode pole piece and one with simulated battery form
Pole pole piece, to measure the internal resistance of pole piece.However, in the present invention preferably, be fixed on the insulation every
Two materials of pole piece 20 of the both sides of film 10 are identical.It is identical by the way that two pole pieces are set in the present invention
Pole piece, i.e., be simultaneously anode pole piece or cathode pole piece prepared by identical material, and such set-up mode can
The ohmic internal resistance of negative or positive electrode is directly obtained, the internal resistance in order to analyze battery is constituted.
It is above-mentioned for testing test sample of the electrode material with respect to internal resistance according to the present invention, for prepared
Pole piece 20 does not have particular/special requirement, and it is referred to the method system that this area routinely prepares negative or positive electrode
It is standby.Preferably, electrode material layer 21 and identical material in the pole piece 20 of test sample of the present invention
Anode/the negative pole of preparation has identical compacted density.For example when electrode active material is LiFePO4,
The compacted density of pole piece is 1.8-2.6g/cm3；When such as electrode active material is cobalt acid iron lithium again, pole piece
Compacted density be 3.2-4.3g/cm3.By adjusting the compacted density of electrode material layer 21 in pole piece 20,
Be conducive to more accurately testing out the internal resistance of electrode material to be measured.
It is above-mentioned for testing test sample of the electrode material with respect to internal resistance according to the present invention, as long as by two poles
Piece 20 is closely fixed on the both sides of insulation diaphragm 10.In a kind of preferred embodiment of the invention
In.As described in Figure 3, preferably described test sample has winding-structure, and it is by by two pole pieces 20
Be fixed on insulation diaphragm 10 both sides formed composite 30, then by the composite 30 from one end to
The other end winds to be formed.In the present invention by forming the test sample with winding-structure, one side energy
Enough so that two pole pieces 20 are more tight with insulation diaphragm structure, be on the other hand conducive to reducing and test
The size of sample, in order to reduce the size that storage has the vessel of electrolyte.
It is above-mentioned for testing test sample of the electrode material with respect to internal resistance according to the present invention, it is preferable that described
Test sample also includes insulation roll around rod 40, and the insulation roll is located in the winding-structure around rod 40
The heart, the Filament Wound Composite is in the insulation roll on rod 40.Insulation roll is around rod 40 in the present invention
Set and be on the one hand easy to the formation of test sample winding-structure, on the other hand assign test sample certain
Stereochemical structure, is easy to picking and placeing for test sample during follow-up test.
It is above-mentioned for testing test sample of the electrode material with respect to internal resistance according to the present invention, in practical operation
Can be using any conventional mode by the terminals phase of two current collector layers of electrode 22 and internal resistance test device
Even, it is easy to current collector layers 22 with external power source phase for the ease of simplifying follow-up test flow in the present invention
Even, it is preferable that the edge of the relatively described electrode material layer 21 in one end of current collector layers 22 in the pole piece
Stretch out to form lug 23.It is highly preferred that the test sample has winding-structure, the collector
The side that lug 23 is formed with layer 22 is located at the winding end of the winding-structure, and the lug 23
It is exposed outside the winding-structure.
It is above-mentioned for testing test sample of the electrode material with respect to internal resistance according to the present invention, it is preferable that described
Test sample also includes fixed material, and the fixed material is used to for pole piece 20 to be fixed on insulation diaphragm 10
Both sides, and/or for fixation the winding-structure for being formed is wound by composite 30.Preferably, it is described
Fixed material is binding agent or adhesive plaster.
It is above-mentioned for testing test sample of the electrode material with respect to internal resistance according to the present invention, it is preferable that described
Insulation diaphragm 10 and the pole piece 20 are respectively provided with rectangle structure, and the insulation diaphragm 10 width
More than the width of the pole piece 20, the pole piece is fixed on the centre of the width of the insulation diaphragm 10
Region.The pole piece is fixed on the zone line of the width of the insulation diaphragm 10, to avoid making
Measurement error produced by two pole piece directly contacts of the origin cause of formation.
It is above-mentioned for testing test sample of the electrode material with respect to internal resistance according to the present invention, it is preferable that described
The thickness of insulation diaphragm 10 is 10-50 μm, and the thickness of electrode material layer 21 is in the pole piece
50-250 μm, the thickness of current collector layers 22 is 8-30 μm.
Meanwhile, a kind of method of testing for testing the relative internal resistance of electrode material is additionally provided in the present invention,
The method of testing is comprised the following steps：S1, control electrode material and electrode material to be measured are taken respectively, will
Both prepare test sample at identical conditions, and each test sample includes insulation diaphragm electrode respectively
10 electrodes and two pole pieces 20 of the both sides of the insulation diaphragm 10 are fixed on, the pole piece 20 includes
With the electrode material layer 21 and the afflux positioned at outside that the electrode of insulation diaphragm electrode 10 is affixed setting
Body layer 22；S2, using identical internal resistance test device in identical electrolyte, measurement is containing right respectively
According to the test sample with electrode material and the internal resistance value of the test sample containing electrode material to be measured, you can
Know the relative internal resistance of the electrode material to be measured.
This method provided by the present invention, it is not necessary to complicated battery making apparatus, it is not necessary to it is time-consuming compared with
Battery Making programme long, substantial amounts of can save labour cost and Master Cost, and the present invention is carried
What is supplied is this simple with respect to the test environment of the test sample of internal resistance for testing electrode material, it is only necessary to put
Put and electrode both positive and negative polarity internal resistance just can quickly be tested using internal resistance test device in electrolyte.
According to the present invention for testing method of testing of the electrode material with respect to internal resistance, it is preferable that each survey
Two materials of pole piece 20 that the both sides of the insulation diaphragm 10 are fixed in test agent are identical.In the present invention
Identical pole piece is set to by by two pole pieces, i.e., is simultaneously the anode pole piece or cathode pole piece of identical material,
Such set-up mode can directly obtain the ohmic internal resistance of negative or positive electrode, in order to analyze in battery
Resistance composition.
According to the present invention for testing method of testing of the electrode material with respect to internal resistance, it is preferable that prepare described
The step of test sample, includes：S11, take electrode material and prepare pole piece 20, the pole piece 20 includes afflux
Body layer 22 and the electrode material layer 21 being formed in the current collector layers 22；S12, take insulation diaphragm 10
With two pole pieces, by the pole piece by electrode material layer 21 towards in the way of the insulation diaphragm 10
The both sides for being arranged on the insulation diaphragm 10 form composite, and the fixation composite is tested
Sample.
It is above-mentioned for testing in method of testing of the electrode material with respect to internal resistance in the present invention, for pole piece 20
Preparation method do not have particular/special requirement, its preparation side for being referred to conventional cathode/negative pole in the prior art
Method.In a kind of preferred embodiment of the invention, wrap the step of pole piece 20 are prepared in S11 described above
Include：By electrode material (such as LiFePO 4 material) and conductive agent (such as conductive black, super-p Li),
(for example weight compares 91 to binding agent (such as Kynoar, PVDF HSV900) in proportion:4:5) add
(solid content is 35wt%-60wt% to enter in solvent (such as 1-METHYLPYRROLIDONE, NMP) formation
) electrode slurry, then prepared electrode slurry is coated in collector (positive pole such as aluminium foil, negative pole
Such as Copper Foil) on, and heat (preferably heating-up temperature is 50-180 DEG C, and the heat time is 3-30min)
Solvent is to form electrode material preparation layers in removing slurry, then the electrode material preparation layers are pressed to obtain
Needed for compacted density (can refer to conventional compaction density when identical material prepares positive pole/negative pole, such as phosphorus
The compacted density of sour iron lithium material is 1.8-2.6g/cm3, the compacted density of cobalt acid iron lithium material is
3.2-4.3g/cm3) the electrode material layer 21
The present invention is above-mentioned for testing electrode material focusing on respect to the method for testing of internal resistance, will compare
Test sample is prepared at identical conditions with electrode material and electrode material to be measured, and in identical condition
Under carry out inner walkway, intuitively contrasted in order to be formed.Wherein, lived for the positive pole/negative pole for being used
Property material, conductive agent, binding agent, solvent without particular/special requirement, weight ratio for each raw material and
The temperature and time of subsequent heat treatment is also without particular/special requirement, its routine for being referred to this area
The choice of technology, will not be repeated here.Meanwhile, in the present invention to the selection of insulation diaphragm 10 also not
There is particular/special requirement, its barrier film 10 that can arbitrarily can be used in liquid cell, or arbitrarily simplification
Insulating materials with certain hole, such as filter paper.
According to the present invention for testing method of testing of the electrode material with respect to internal resistance, it is preferable that the S11
In the step of prepare pole piece 20 in, retain the part surface of described one end of current collector layers 22, make its exposed
Lug is formed in the outside of electrode material layer 21.
According to the present invention for testing method of testing of the electrode material with respect to internal resistance, it is preferable that the S12
The step of middle fixation composite 30, includes：The composite is wound from one end to the other end
Fixation forms the test sample after forming winding-structure.
According to the present invention for testing method of testing of the electrode material with respect to internal resistance, it is preferable that the S12
In the step of middle fixation composite 30, take insulation roll around rod, by insulation roll around rod centered on twine
The test sample with winding-structure is formed around the composite.
According to the present invention for testing method of testing of the electrode material with respect to internal resistance, it is preferable that the S12
In the step of middle fixation composite 30, the one of lug 23 is formed with the current collector layers 22
Side is located at the winding end of the winding-structure, and the lug 23 is exposed outside the winding-structure.
According to the present invention for testing method of testing of the electrode material with respect to internal resistance, for institute in test process
The electrolyte of use does not have particular/special requirement, its can be it is any suitable in the use as battery electrolyte,
In the present invention in order to reduce cost of material, simplify the configuration process of electrolyte, it is preferable that in the S2
The electrolyte for being used is the sulfuric acid Aqueous Lithium Salts of 0.1-2mol/L.
The present invention is further illustrated for testing electrode material below with reference to specific embodiment and comparative example
With respect to the test sample of internal resistance and for testing beneficial effect of the electrode material with respect to the method for testing of internal resistance
Really.
Electrode material (positive electrode) employed in following examples and comparative is as follows：
Control positive electrode：Commercially available from southern chemical company LiFePO4 product P2 (carbon coating
LiFePO4Material, the weight content of carbon is 2wt% in product)；
Testing sample one：Commercially available from the public LiFePO4 product A1 of Anda science and technology Energy Co., Ltd.
(the LiFePO of carbon coating4Material, the weight content of carbon is 3.8wt% in product)；
Testing sample two：Commercially available from the LiFePO4 product of Anda company of science and technology Energy Co., Ltd.
A2 (the LiFePO of carbon coating4Material, the weight content of carbon is 1.8wt% in product)；
Raw material and producer employed in following examples and comparative is as follows：
Conductive agent：Commercially available from conductive black product super p-Li (abbreviation SP) of special Mikoh Corp.；
Binding agent：Commercially available from the Kynoar product PVDF HSV900 of Arkema；
Solvent：Commercially available from the LITHIUM BATTERY 1-METHYLPYRROLIDONE product NMP of Puyang light chemical company；
Insulation diaphragm：Commercially available from the product ND2542 of Cangzhou jewel company.
Comparative example 1
Using the internal resistance of the method measuring electrode material for preparing battery in the prior art, specific method is as follows：
(1) preparation of positive pole：Respectively by control positive electrode, testing sample one and testing sample two
Compare 91 according to weight with conductive agent (SP), binding agent (HSV900)：4：5 are added to solvent (NMP)
Middle stirring forms (solid content is 42%) slurry, then prepared slurry is produced with Xin Hui companies
(12 meters long) coating machine (110-130 DEG C of temperature is incremented by) is coated in the collector aluminium that thickness is 20 μm
Electrode material preparation layers are formed in the both side surface of paper tinsel, the positive pole intermediate that gross thickness is 180 μm is obtained；
With positive pole intermediate described in twin rollers roll-in, the compacted density for obtaining electrode material layer is 2.15g/cm3It is right
According to positive pole, positive pole to be measured one and positive pole to be measured two.
(2) preparation of negative pole：With China fir China fir electrographite FSN-4 as negative material, by itself and conductive agent
(SP), thickener CMC and binding agent SBR compare 95 according to weight：1：1.5:2.5 are added to solvent
Stirring forms (solid content is 48%) slurry in (deionized water), then prepared slurry is used
(12 meters long) coating machine (110-130 DEG C of temperature is incremented by) of Xin Hui companies production is coated in thickness for 20 μm
Copper foil of affluxion body both side surface on formed electrode material preparation layers, obtain gross thickness for 140 μm bear
Pole intermediate, with negative pole intermediate described in twin rollers roll-in, the compacted density for obtaining electrode material layer is
1.45g/cm3Negative pole.
(3) preparation of battery：The control positive pole of foregoing preparation, positive pole to be measured one and to be measured is respectively adopted
Positive pole two as battery positive pole, using foregoing preparation negative pole as battery negative pole, using ND2542
As battery diaphragm, using lithium hexafluoro phosphate organic electrolyte, the LiPF of 1mol/L6/(EC+DMC)
(wherein LiPF6 is lithium hexafluoro phosphate, and EC is ethylene carbonate, and DMC is dimethyl carbonate, EC
It is 1 with the volume ratio of DMC:1) as battery electrolyte, 20AH is made under identical process conditions
The battery of model.
(4) device that inner walkway is used：HIOKI-3554 battery Inner Resistance Tester in Virtual Instrument surveys internal resistance.
(5) result of inner walkway：A1(0.8mΩ)<P2(1.2mΩ)<A2(1.22mΩ).
Embodiment 1
For illustrating the present invention for testing electrode material with respect to the test sample of internal resistance and for testing
Method of testing of the electrode material with respect to internal resistance.
(1) control positive electrode, testing sample one and testing sample two are prepared into test sample respectively,
Comprise the following steps that：
Respectively by control positive electrode, testing sample one and testing sample two and conductive agent (SP), viscous
Knot agent (HSV900) compares 91 according to weight：4：5 be added to and stir in solvent NMP and formed (admittedly contain
Measure is 42%) slurry, then prepared slurry is coated in the current collector aluminum foil that thickness is 20 μm,
And 5min desolvations are toasted at 120 DEG C to form thickness as 80 μm of electrode material preparation layers, obtain pole
Piece intermediate, with pole piece intermediate described in twin rollers roll-in, the compacted density for obtaining electrode material layer is
2.15g/cm3Pole piece, the control pole piece of 16cm × 4cm, pole piece one and pole piece two are obtained through cutting out.
The control pole piece of above-mentioned preparation is taken respectively, and pole piece one and pole piece two prepare test sample, each test
The preparation method of sample is to take two pole pieces of identical, and electrode material layer inwardly, and symmetrical is fitted in
Thickness is that the both sides of 20 μm of insulation diaphragm (filter paper) form composite, takes insulation roll around rod, with
Insulation roll is formed with winding the Filament Wound Composite in the insulation roll centered on rod on rod
Structure, fixes the reel number structure and obtains the test sample with adhesive tape.
(2) inner walkway method：Prepare concentration for 1mol/L sulfuric acid lithium salt solution as electrolyte,
By two collectors of pole piece in foregoing prepared each test sample respectively with HIOKI-3554 batteries in
The test interface that resistance tester surveys internal resistance is connected.
(3) result of inner walkway：A1(124mΩ)<P2(162mΩ)<A2(169mΩ).
From comparative example 1 and the comparing result of embodiment 1：Using provided by the present invention for testing
Electrode material with respect in test result and the comparative example 1 of the method for testing of internal resistance by preparing battery to measure
The inner walkway result trend of positive electrode is identical, is A1<P2<A2.As can be seen here, using this hair
Bright provided test sample and method of testing can test electrode material with respect to internal resistance.
Additionally, it is provided by the present invention this for testing test sample of the electrode material with respect to internal resistance, no
Need complicated battery making apparatus, it is not necessary to time-consuming battery Making programme more long, substantial amounts of can save
Less manpower expense and Master Cost, and it is provided by the present invention this relatively interior for testing electrode material
The test environment of the test sample of resistance is simple, it is only necessary to places and just can using internal resistance test device in electrolyte
Quick test electrode both positive and negative polarity internal resistance.
Identical pole piece is set to by by two pole pieces in the present invention, i.e., is simultaneously the positive pole of identical material
Pole piece or cathode pole piece, such set-up mode can directly obtain the ohmic internal resistance of negative or positive electrode, with
It is easy to the internal resistance for analyzing battery to constitute.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention is not limited
Detail in above-mentioned implementation method, in range of the technology design of the invention, can be to the present invention
Technical scheme carry out various simple variants, these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment,
In the case of reconcilable, can be combined by any suitable means.In order to avoid unnecessary
Repeat, the present invention is no longer separately illustrated to various possible combinations.
Additionally, can also be combined between a variety of implementation methods of the invention, as long as its
Without prejudice to thought of the invention, it should equally be considered as content disclosed in this invention.
Claims (10)
1. it is a kind of for testing test sample of the electrode material with respect to internal resistance, it is characterised in that the survey
Test agent includes insulation diaphragm (10) and is fixed on two pole pieces of the insulation diaphragm (10) both sides
(20), the pole piece (20) is including being affixed the electrode material layer of setting with the insulation diaphragm (10)
(21) and positioned at the current collector layers (22) in outside.
2. test sample according to claim 1, wherein, it is fixed on the insulation diaphragm (10)
Two pole piece (20) materials of both sides are identical.
3. test sample according to claim 1 and 2, wherein, the test sample has volume
Around structure, it is to form compound by by the both sides that two pole pieces (20) are fixed on insulation diaphragm (10)
Material (30), then the composite (30) is wound from one end to the other end formed,
Preferably, the test sample also includes insulation roll around rod (40), and the insulation roll is around rod (40)
Positioned at the center of the winding-structure, the composite (30) is wrapped in the insulation roll around rod (40)
On.
4. test sample according to claim 1 and 2, wherein, the insulation diaphragm (10)
Rectangle structure is respectively provided with the pole piece (20), and the width of the insulation diaphragm (10) is more than institute
The width of pole piece (20) is stated, the pole piece (20) is fixed on the insulation diaphragm (10) width
Zone line.
5. it is a kind of for testing method of testing of the electrode material with respect to internal resistance, it is characterised in that the survey
Method for testing is comprised the following steps：
S1, control electrode material and electrode material to be measured are taken respectively, both are made at identical conditions
Standby test sample, each test sample includes insulation diaphragm (10) and is fixed on the insulation respectively
Two pole pieces (20) of barrier film (10) both sides, the pole piece (20) including with the insulation diaphragm (10)
It is affixed the electrode material layer (21) and the current collector layers (22) positioned at outside of setting；
S2, using identical internal resistance test device in identical electrolyte, respectively measurement containing control electricity consumption
The internal resistance value of the test sample of pole material and the test sample containing electrode material to be measured, you can learn described
The relative internal resistance of electrode material to be measured.
6. method of testing according to claim 5, wherein, it is fixed in each test sample
Two pole piece (20) materials of insulation diaphragm (10) both sides are identical.
7. method of testing according to claim 5, wherein, test sample is prepared in the S1
Step includes：
S11, take electrode material and prepare pole piece (20), the pole piece (20) includes current collector layers (22)
With the electrode material layer (21) being formed in the current collector layers (22)；
S12, insulation diaphragm (10) and two pole pieces are taken, by the pole piece with electrode material layer (21)
Mode towards the insulation diaphragm (10) is arranged on the both sides of the insulation diaphragm (10) and forms compound
Material (30), the fixation composite (30) obtains test sample.
8. method of testing according to claim 7, wherein, pole piece (20) is prepared in the S11
The step of include：
Electrode slurry during electrode material, conductive agent, binding agent, solvent are mixed；
By the electrode slurry coating on a current collector, and heat removing slurry in solvent to form electrode material
The heating condition of solvent includes in material preparation layers, preferably heating removing slurry：Heating-up temperature is 50-180 DEG C,
Heat time is 3-30min；
The electrode material preparation layers are pressed to obtain the electrode material layer of required compacted density
(21)。
9. method of testing according to claim 7, wherein, fixing composite material in the S12
(30) the step of, includes：The composite (30) is wound from one end to the other end and forms winding knot
Fixation forms the test sample after structure,
Preferably, in the S12 the step of fixing composite material (30), insulation roll is taken around rod (40),
The composite (30) is wound centered on rod (40) by insulation roll and forms the institute with winding-structure
State test sample.
10. method of testing according to claim 5, wherein, the electrolysis employed in the S2
Liquid is the sulfuric acid Aqueous Lithium Salts of 0.1-2mol/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510788136.8A CN106707024A (en) | 2015-11-16 | 2015-11-16 | Test sample used for testing relative internal resistance of electrode material and test method used for testing relative internal resistance of electrode material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510788136.8A CN106707024A (en) | 2015-11-16 | 2015-11-16 | Test sample used for testing relative internal resistance of electrode material and test method used for testing relative internal resistance of electrode material |
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| CN106707024A true CN106707024A (en) | 2017-05-24 |
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| CN109031128A (en) * | 2018-05-18 | 2018-12-18 | 上海恩捷新材料科技股份有限公司 | A method of test battery diaphragm resistance |
| CN109596982A (en) * | 2017-09-28 | 2019-04-09 | 宁德时代新能源科技股份有限公司 | battery detection structure |
| CN110018348A (en) * | 2018-01-09 | 2019-07-16 | 中天储能科技有限公司 | Lithium battery internal resistance measurement method and device |
| CN110544761A (en) * | 2019-09-09 | 2019-12-06 | 广州鹏辉能源科技股份有限公司 | Preparation and evaluation methods of electrode plate, flexible porous positive plate and preparation method thereof, battery cell and lithium battery |
| CN111220850A (en) * | 2019-11-18 | 2020-06-02 | 深圳新恒业电池科技有限公司 | Battery diaphragm resistance value measuring method and device |
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