CN115780379A - Method for removing single-side slurry of lithium ion battery pole piece - Google Patents
Method for removing single-side slurry of lithium ion battery pole piece Download PDFInfo
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- CN115780379A CN115780379A CN202211378916.1A CN202211378916A CN115780379A CN 115780379 A CN115780379 A CN 115780379A CN 202211378916 A CN202211378916 A CN 202211378916A CN 115780379 A CN115780379 A CN 115780379A
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- pole piece
- lithium ion
- ion battery
- battery pole
- slurry
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 58
- 239000002002 slurry Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000002390 adhesive tape Substances 0.000 claims abstract description 50
- 239000002904 solvent Substances 0.000 claims abstract description 40
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 239000008367 deionised water Substances 0.000 claims abstract description 9
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 9
- 239000004094 surface-active agent Substances 0.000 claims abstract description 9
- 238000004513 sizing Methods 0.000 claims abstract description 8
- 239000013557 residual solvent Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims abstract description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 19
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 18
- 239000011521 glass Substances 0.000 claims description 9
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 4
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 4
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 4
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 claims description 3
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 claims 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 claims 1
- 239000010410 layer Substances 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 13
- 230000000694 effects Effects 0.000 description 11
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 9
- 238000007789 sealing Methods 0.000 description 9
- 235000019441 ethanol Nutrition 0.000 description 8
- 230000002093 peripheral effect Effects 0.000 description 6
- 238000011160 research Methods 0.000 description 4
- 231100000252 nontoxic Toxicity 0.000 description 3
- 230000003000 nontoxic effect Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 208000032953 Device battery issue Diseases 0.000 description 2
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000007791 dehumidification Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012044 organic layer Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- -1 O and LiFRLi Chemical compound 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- CKFRRHLHAJZIIN-UHFFFAOYSA-N cobalt lithium Chemical compound [Li].[Co] CKFRRHLHAJZIIN-UHFFFAOYSA-N 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 235000019633 pungent taste Nutrition 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Electrochemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a method for removing single-side slurry of a lithium ion battery pole piece, which comprises the following steps: flatly placing the lithium ion battery pole piece on a waterproof plate; sticking the edge of the lithium ion battery pole piece on a waterproof board by adopting a waterproof adhesive tape; removing oily layer substances on the surface of the lithium ion battery pole piece slurry by using an adhesive tape or wiping off the oily layer substances by using a surfactant; soaking the dust-free paper in an erasing solvent; the erasing solvent is absolute ethyl alcohol or deionized water; wiping the surface of the lithium ion battery pole piece by using the dust-free paper soaked with the wiping solvent to separate the slurry from the base material of the lithium ion battery pole piece, thereby obtaining the lithium ion battery pole piece after the slurry is separated; and removing residual solvent on the surface of the lithium ion battery pole piece after the sizing agent is separated, and drying to obtain the lithium ion battery pole piece with the single-side sizing agent removed. The invention adopts a two-step method to erase the battery slurry simply and quickly, and has 100 percent of erasing rate on various types of lithium ion battery pole pieces.
Description
Technical Field
The invention belongs to the field of failure analysis of lithium ion batteries, and particularly relates to a method for removing single-side slurry of a lithium ion battery pole piece.
Background
In 1991, the lithium ion battery technology is commercialized for the first time, and is successfully applied to the fields of portable consumer electronics, electric automobiles, energy storage and the like due to the advantages of high energy density, long cycle life, good rate capability and the like. The failure analysis of the lithium ion battery can accurately obtain the main reason of the battery failure, which is beneficial to improving the safety and reliability of the battery and prolonging the service life on one hand, and on the other hand, enterprises can optimize the improvement scheme in the battery production and preparation process according to the failure reason.
Capacity fade is a common mode of battery failure, and the means for analyzing it is primarily electrochemical measurements, including button semi-electrical and symmetric battery impedance tests. One of the key steps in these tests is to remove the slurry from one side of the disassembled double-sided pole piece to make a single-sided pole piece. In particular, this step is to ensure that the wiping paste is cleanly cleaned and that the collected flow is not damaged, and that the paste state on the back of the pole piece is not contaminated. The conventional single-sided pole piece processing method is to directly wipe the double-sided pole piece by using N-methyl pyrrolidone, and the method is time-consuming, low in efficiency and easy to damage a current collector, even the slurry state of the other side of a pole piece material is easily and seriously influenced due to the strong corrosivity of a solvent, so that the obtained single-sided pole piece is low in quality, and the reliability and the success rate of a subsequent experiment are influenced.
CN 110252693A discloses a method for erasing a pole piece with a mixed solution of water, ethanol and dimethyl carbonate (DMC). A large body of literature suggests that the major component of the electrode sheet interface films (cathode CEI film and anode SEI film) comprises Li in the inner layer 2 CO 3 、LiOH·H 2 Inorganic lithium such as O and LiFRLi, ROLi and ROCO of the salt and outer layer 2 Organic lithium salts such as Li, and lithium ion batteries in EC-DMC-DEC/LiPF 6 The lower boundary film of the solution system is stable, so that the lower boundary film is theoretically difficult to wipe if the lower boundary film is directly wiped off by DMC or a mixed substance of DMC and water and ethanol. In particular, for a failed cell pole piece, because the interfacial film of the failed cell is thicker after high-temperature storage or circulation, a reaction can macroscopically find that the surface of the pole piece has a layer of obvious oily organic layer, and the oily organic layer is difficult to dissolve even if pure DMC is used, so theoretically, the mixture of DMC and water and ethanol should be difficult to dissolve. In addition, for some anodes with serious lithium precipitation, if the anodes are directly erased by using the mixed liquid containing water, the water reacts with lithium violently, and the anodes are easy to smoke and even fire, thus being unsafe and environment-friendly.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for removing single-side slurry of a lithium ion battery pole piece, the invention adopts a two-step method to erase the battery slurry simply and quickly, and the erasing rate of the lithium ion battery pole piece is 100 percent for various types of lithium ion battery pole pieces, as shown in figures 3-4.
The invention adopts the following technical scheme:
a method for removing single-side slurry of a lithium ion battery pole piece comprises the following steps:
step (one): flatly paving the lithium ion battery pole piece on a waterproof plate;
step (II): the edges around the lithium ion battery pole piece are adhered to a waterproof board by waterproof adhesive tapes for sealing, and the lithium ion battery pole piece is fixed and waterproof; keeping the pole piece flat, and keeping the bonding part tightly attached to the waterproof plate to prevent the solvent from infiltrating into the back pole piece;
step (III): removing oily layer substances on the surface of the lithium ion battery pole piece slurry after sealing by using an adhesive tape or wiping off the oily layer substances by using a surfactant;
step (IV): soaking the dust-free paper in an erasing solvent; the erasing solvent is absolute ethyl alcohol or deionized water; and (5) removing the oily layer and the precipitated lithium on the surface of the pole piece in the step (III), and selecting green, nontoxic and low-irritation absolute ethyl alcohol or deionized water as a solvent to easily erase the slurry.
Step (V): lightly wiping the surface of the lithium ion battery pole piece by using dust-free paper soaked with an erasing solvent so as to enable the slurry to achieve the effect of separating from the lithium ion battery pole piece base material, and obtaining the lithium ion battery pole piece after the slurry is separated;
step (six): and removing residual solvent on the surface of the lithium ion battery pole piece after the slurry is separated by using dust-free paper, and then drying to obtain the lithium ion battery pole piece with the single-side slurry removed.
Further, the lithium ion battery pole piece is an anode pole piece, and the erasing solvent is deionized water.
Further, the lithium ion battery pole piece is one of a ternary lithium ion battery pole piece, a lithium iron phosphate battery pole piece and a lithium cobalt acid battery pole piece, and the erasing solvent is absolute ethyl alcohol.
Further, the adhesive tape in the step (three) is a common daily transparent adhesive tape.
Further, in the step (III), the surfactant is sodium dodecyl benzene sulfonate or sodium stearate.
Further, the waterproof adhesive tape in the step (II) is blue glue or green glue or double-sided adhesive tape.
Further, the waterproof plate in the step (one) is a glass plate.
The invention has the beneficial technical effects that: the raw materials adopted in the invention are simple and easy to obtain, low in cost, nontoxic and environment-friendly; the operation is simple, the effect is obvious, and the success rate is high; compared with the traditional treatment method, the time consumption is greatly shortened, and the method is very efficient; the test results of the button cell and the symmetrical cell prepared by the prepared single-sided pole piece have high consistency.
Drawings
FIG. 1 is a process flow diagram of the present invention;
fig. 2 is a schematic structural diagram of the lithium ion battery pole piece of the invention fixed on a waterproof board.
Labeled in fig. 2: 1-waterproof board; 2-pole piece of lithium ion battery; 3-waterproof rubberized fabric; 4-adhesive tape; 5-dust-free paper; 6-an erase agent;
FIG. 3 is a comparison graph of the erasing effect of lithium cobaltate cathode plate by the method of the present invention;
FIG. 4 is a comparison graph of the erasing effect of the ternary anode plate by the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1 to fig. 2, the invention provides a simple and efficient method for removing a single-side slurry of a lithium ion battery pole piece, the method comprises the steps of limiting and fixing a lithium ion battery pole piece 2 on a waterproof plate 1, carrying out sealing waterproof treatment along the peripheral edge of the pole piece, then using an adhesive tape 4 to stick or using a surfactant to wipe off oily layer substances on the surface of the pole piece slurry, then slightly wiping carrier dust-free paper 5 soaked with a wiping solvent on the surface of the pole piece to separate the slurry from a base material of the pole piece, and using absolute ethyl alcohol or deionized water as the wiping solvent 6. The sealing waterproof treatment mode is that the waterproof tape 3 is tightly bonded with the waterproof board along the peripheral edge of the lithium ion battery pole piece 2, so that the sealing waterproof effect is achieved, and meanwhile, the pole piece can be firmly and smoothly fixed on the waterproof board. The waterproof board is made of common glass board. The adhesive tape for sticking the oil removal layer is a daily transparent adhesive tape; the surfactant is common sodium dodecyl benzene sulfonate or sodium stearate; the waterproof adhesive tape is a blue adhesive tape and a green adhesive tape which are frequently used in the lithium ion production process, or a blue film or a double-sided adhesive tape which is stuck on the outermost layer of the lithium ion battery cell; the solvent is anhydrous ethanol or deionized water which is used conventionally. The consumables are simple and easy to obtain, low in cost, non-toxic and environment-friendly. In the removing method, the oily layer material on the surface of the pole piece slurry is removed by using the adhesive tape or is wiped off by using a surfactant, and the step is a key step for improving the slurry wiping efficiency and the wiping rate; after a layer of oily substance on the surface of the pole piece is adhered and removed, the pole piece is lightly wiped by using dust-free paper soaked with an erasing solvent, and then the slurry can be quickly erased.
Fig. 3 is a comparison graph of the effect of erasing the lithium cobaltate cathode pole piece by using the method of the present invention, and the graphs a and b in fig. 3 are the visual result and SEM result of the lithium cobaltate cathode pole piece erased by using the method of the present invention, and it can be seen from the graph a that the surface of the lithium cobaltate cathode pole piece erased by using the method of the present invention is observed without slurry adhesion by naked eyes, the SEM result of the graph b shows that no slurry adhesion exists on the aluminum foil, and the SEM result of the graph b verifies the graph a; fig. 3c and d are a visual result and SEM result of the lithium cobaltate cathode pole piece erased by the prior art method, and it can be seen from fig. c that a large amount of slurry adheres to the surface of the lithium cobaltate cathode pole piece erased by the prior art method, and the SEM result of fig. d shows that a large amount of slurry adheres to the aluminum foil, and the SEM result of fig. d verifies fig. c.
FIG. 4 is a comparison graph of the erasing effect of the ternary anode plate by the method of the present invention, and the graphs a and b in FIG. 4 are the visual result and SEM result of the ternary anode plate erased by the method of the present invention, and it can be seen from the graph a that the surface of the ternary anode plate erased by the method of the present invention is observed by naked eyes without slurry adhesion, the SEM result of the graph b shows that no slurry adhesion exists on the copper foil, and the SEM result of the graph b verifies the graph a; fig. 4c and d are an intuitive result and SEM result of erasing the ternary anode plate by the prior art method, and it can be seen from fig. c that a large amount of slurry adheres to the surface of the ternary anode plate erased by the prior art method, and the SEM result of fig. d shows that a large amount of slurry adheres to the copper foil, and the SEM result of fig. d verifies fig. c.
The following is a detailed description of specific examples and comparative examples:
example 1
Example 1 one-sided paste of a ternary cathode sheet was removed. The specific removal steps are as follows:
taking a cathode pole piece to be treated, wherein the size of the cathode pole piece is 8.2cmx14cm, flatly placing the cathode pole piece on a common glass plate, and the size of the glass plate is 20cmx30cm;
taking a waterproof adhesive tape (3M): the two electrodes are 9.4cm x1cm and 17cm x1cm respectively, and the three-element cathode pole piece is adhered to a common glass plate along the peripheral edge of the three-element cathode pole piece, so that the pole piece can be fixed and a solvent is prevented from permeating into the reverse side;
taking a common transparent adhesive tape, flatly paving the common transparent adhesive tape on the surface of a pole piece to be wiped, slightly pressing the common transparent adhesive tape to ensure that the common transparent adhesive tape is attached to the pole piece, and then tearing the adhesive tape, wherein a layer of black substance is obviously adhered to the adhesive tape, and the black substance is a layer of oily substance on the surface of the pole piece;
taking two pieces of dust-free paper, wherein the size of the dust-free paper is 9.3cmx16cm;
preparing an erasing solvent: absolute ethyl alcohol;
pouring a proper amount of erasing solvent on the dust-free paper until the dust-free paper is completely soaked;
directly and lightly wiping the surface of the pole piece by using the dust-free paper soaked by the wiping solvent, wherein the surface sizing agent is quickly and completely peeled off, and lightly sucking the residual solvent on the surface of the pole piece by using another piece of dry dust-free paper;
and (3) placing the processed pole piece into a vacuum oven for simple drying, controlling the drying temperature to be 30-40 ℃, and then sealing and storing for further research and use.
Example 2
Embodiment 2 removing single-sided slurry of a lithium iron phosphate cathode plate specifically comprises the following steps:
taking a cathode pole piece to be processed, wherein the size of the cathode pole piece is 8.2cmx14cm, flatly placing the cathode pole piece on a common glass plate, and the size of the glass plate is 20cmx30cm;
taking a waterproof adhesive tape (3M): two of 9.4cm x1cm and two of 17cm x1cm are respectively adhered to the common glass plate along the peripheral edges of the pole piece, so that the pole piece can be fixed and a solvent is prevented from permeating into the back surface;
taking a common transparent adhesive tape, flatly paving the common transparent adhesive tape on the surface of a pole piece to be wiped, slightly pressing the common transparent adhesive tape to ensure that the common transparent adhesive tape is attached to the pole piece, and then tearing the adhesive tape, wherein a layer of black substance is obviously adhered to the adhesive tape, and the black substance is a layer of oily substance on the surface of the pole piece;
taking two pieces of dust-free paper, wherein the size of the dust-free paper is 9.3cmx16cm;
preparing an erasing solvent: water;
pouring a proper amount of erasing solvent on the dust-free paper until the dust-free paper is completely soaked;
lightly wiping the surface of the pole piece by using the dust-free paper soaked by the wiping solvent, enabling the surface sizing agent to quickly and completely fall off, and lightly sucking the residual solvent on the surface of the pole piece by using another piece of dry dust-free paper;
and (3) placing the processed pole piece into a vacuum oven for simple drying, controlling the drying temperature to be between 30 and 40 ℃, and then sealing and storing the pole piece for further research and use.
Example 3
Example 3 removal of the single-sided slurry of the lithium cobaltate cathode plate specifically comprises the following steps:
taking a cathode pole piece to be treated, wherein the size of the cathode pole piece is 8.3cmx15cm, and flatly placing the cathode pole piece on a common plastic waterproof plate, wherein the size of the waterproof plate is 20cmx28cm;
taking a waterproof adhesive tape (3M): two each of 9.3cmx1cm and 16cmx1cm are adhered to the plastic waterproof board along the peripheral edge of the pole piece, so that the pole piece can be fixed and the solvent can be prevented from permeating into the back surface;
taking two pieces of dust-free paper with the size of 9.3cmx16cm, soaking a surfactant sodium dodecyl benzene sulfonate, slightly wiping the surface of the pole piece, and wiping surface residues with clean dust-free paper after an oily layer on the surface of the pole piece is obviously dissolved;
preparing an erasing solvent: alcohol;
pouring a proper amount of erasing solvent on the dust-free paper until the dust-free paper is completely soaked;
directly and lightly wiping the surface of the pole piece by using the dust-free paper soaked by the wiping solvent, wherein the surface sizing agent is quickly and completely peeled off, and lightly sucking the residual solvent on the surface of the pole piece by using another piece of dry dust-free paper;
and (3) naturally drying the processed pole piece in a dehumidification room to dryness, controlling the drying temperature to be 45-85 ℃, and then sealing and storing the pole piece for further research and use.
Example 4
Example 4 removal of single-sided slurry of a lithium cobaltate anode plate specifically comprises the following steps:
taking a cathode pole piece to be treated, wherein the size of the cathode pole piece is 8.3cmx15cm, and flatly placing the cathode pole piece on a common plastic waterproof plate, wherein the size of the waterproof plate is 20cmx28cm;
taking a waterproof adhesive tape (3M): two each of 9.3cmx1cm and 16cmx1cm are adhered to the plastic waterproof board along the peripheral edge of the pole piece, so that the pole piece can be fixed and the solvent can be prevented from permeating into the back surface;
taking the size of a common transparent adhesive tape, flatly paving the common transparent adhesive tape on the surface of a pole piece to be wiped, slightly pressing the common transparent adhesive tape to ensure that the common transparent adhesive tape is attached to the pole piece, and then tearing the adhesive tape, wherein a layer of black substance is obviously adhered to the adhesive tape, is a layer of oily substance on the surface of the pole piece, and also can be used for removing lithium precipitated on the surface and lithium salt in an SEI (solid electrolyte interphase) film;
taking two pieces of dust-free paper, wherein the size of the dust-free paper is 9.3cmx16cm;
preparing an erasing solvent: deionized water;
pouring a proper amount of erasing solvent on the dust-free paper until the dust-free paper is completely soaked;
directly and lightly wiping the surface of the pole piece by using the dust-free paper soaked by the wiping solvent, wherein the surface sizing agent quickly and completely falls off, and then lightly sucking the residual solvent on the surface of the pole piece by using another piece of dry dust-free paper;
and naturally drying the processed pole piece in a dehumidification room to dryness, controlling the drying temperature to be 45-85 ℃, and then sealing and storing the pole piece for further research and use.
Comparative example 1
The difference between the comparative example 1 and the example 1 is that the oily layer on the surface of the ternary cathode pole piece is not firstly adhered and removed by using an adhesive tape, and an erasing solvent is prepared: water: industrial alcohol: dimethyl carbonate =60 (V/V/V), then directly erase after being soaked with dust-free paper, basically can not erase, the erasing rate is less than 5% after erasing for 10min, while example 1 can be quickly erased only by about 2min, the erasing rate is 100%, and the effect of example 1 is obviously better than that of comparative example 1.
Comparative example 2
The difference between the comparative example 2 and the example 2 is that the surface oily layer of the lithium iron phosphate cathode plate is not firstly adhered and removed by using an adhesive tape, and an erasing solvent is prepared: water: industrial alcohol: dimethyl carbonate =75 (V/V), then directly erasing after being soaked with dust-free paper, is difficult to erase, the erasing rate is less than 20% after erasing for 10min, while example 2 can be quickly erased only by about 2min, the erasing rate is 100%, and example 2 is obviously better than comparative example 2.
Comparative example 3
The difference between the comparative example 3 and the example 3 is that the surface oily layer of the lithium cobaltate cathode pole piece is not firstly adhered and removed by using an adhesive tape, and an erasing solvent is prepared: water: industrial alcohol: dimethyl carbonate =85 (V/V), then is directly erased after being soaked by dust-free paper, is difficult to erase, and the erasing rate is less than 10% after erasing for 10min, while the erasing rate of example 3 can be quickly erased only about 2min, and the erasing rate is 100%, and the erasing effect of example 3 is obviously better than that of comparative example 3.
Comparative example 4
The difference between the comparative example 4 and the example 4 is that the surface oily layer of the lithium cobaltate anode pole piece is not firstly adhered and removed by using an adhesive tape, and an erasing solvent is prepared: water: industrial alcohol: dimethyl carbonate =85 (V/V), then is directly erased after being soaked by dust-free paper, is difficult to erase, the erasing rate is less than 10% after erasing for 10min, and simultaneously, because lithium precipitated on the surface and lithium metal in an SEI film are not adhered by an adhesive tape, water reacts with the lithium to generate a large amount of dense smoke and generate a large amount of pungent taste, pollute the environment and irritate the respiratory tract. And the embodiment 4 can be quickly erased only by about 2min, the erasing rate is 100 percent, and the effect of the embodiment 4 is obviously better than that of the comparative example 4.
Claims (7)
1. A method for removing single-side slurry of a lithium ion battery pole piece is characterized by comprising the following steps:
step (I): flatly placing the lithium ion battery pole piece on a waterproof plate;
step (II): sticking the edge of the lithium ion battery pole piece on a waterproof board by adopting a waterproof adhesive tape;
step (three): removing oily layer substances on the surface of the lithium ion battery pole piece slurry by using an adhesive tape or wiping off the oily layer substances by using a surfactant;
step (IV): soaking the dust-free paper in an erasing solvent; the erasing solvent is absolute ethyl alcohol or deionized water;
step (V): wiping the surface of the lithium ion battery pole piece by using the dust-free paper soaked with the wiping solvent to separate the slurry from the base material of the lithium ion battery pole piece, thereby obtaining the lithium ion battery pole piece after the slurry is separated;
step (six): and removing residual solvent on the surface of the lithium ion battery pole piece after the sizing agent is separated, and drying to obtain the lithium ion battery pole piece with the single-side sizing agent removed.
2. The method for removing the single-sided slurry of the lithium ion battery pole piece according to claim 1, wherein the lithium ion battery pole piece is an anode pole piece, and the erasing solvent is deionized water.
3. The method for removing the single-sided slurry of the lithium ion battery pole piece according to claim 1, wherein the lithium ion battery pole piece is one of a ternary lithium battery pole piece, a lithium iron phosphate battery pole piece and a lithium cobalt oxide battery pole piece, and the erasing solvent is absolute ethyl alcohol.
4. The method for removing the single-sided paste of the lithium ion battery pole piece according to claim 1, wherein the adhesive tape in the step (III) is a transparent adhesive tape.
5. The method for removing the single-sided slurry of the lithium ion battery pole piece according to claim 1, wherein the surfactant in the step (III) is sodium dodecyl benzene sulfonate or sodium stearate.
6. The method for removing the single-sided slurry of the lithium ion battery pole piece according to claim 1, wherein the waterproof adhesive tape in the second step is blue glue, green glue or a double-sided adhesive tape.
7. The method for removing the single-sided slurry of the lithium ion battery pole piece according to claim 1, wherein the waterproof plate in the step (I) is a glass plate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211378916.1A CN115780379A (en) | 2022-11-04 | 2022-11-04 | Method for removing single-side slurry of lithium ion battery pole piece |
| PCT/CN2023/079179 WO2024093076A1 (en) | 2022-11-04 | 2023-03-02 | Method for removing slurry on single side of lithium-ion battery electrode sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211378916.1A CN115780379A (en) | 2022-11-04 | 2022-11-04 | Method for removing single-side slurry of lithium ion battery pole piece |
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| Publication Number | Publication Date |
|---|---|
| CN115780379A true CN115780379A (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211378916.1A Pending CN115780379A (en) | 2022-11-04 | 2022-11-04 | Method for removing single-side slurry of lithium ion battery pole piece |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115780379A (en) |
| WO (1) | WO2024093076A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346365B (en) * | 2013-07-22 | 2015-06-24 | 田东 | Method for recycling negative material from waste lithium ion battery |
| CN109465232A (en) * | 2018-10-15 | 2019-03-15 | 江西星盈科技有限公司 | The treatment process of pole piece |
| CN209379499U (en) * | 2019-01-12 | 2019-09-13 | 江西省世道新能源科技有限公司 | A kind of poly-lithium battery pole piece swab |
| CN110252693A (en) * | 2019-06-18 | 2019-09-20 | 芜湖天弋能源科技有限公司 | A kind of quick minimizing technology of electrodes of lithium-ion batteries single side slurry |
| CN111916668B (en) * | 2020-07-27 | 2021-07-16 | 珠海冠宇电池股份有限公司 | Negative plate, preparation method thereof and lithium ion battery comprising negative plate |
| CN214254463U (en) * | 2020-12-25 | 2021-09-21 | 惠州锂威新能源科技有限公司 | Directional removing device for pole piece coating |
-
2022
- 2022-11-04 CN CN202211378916.1A patent/CN115780379A/en active Pending
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2023
- 2023-03-02 WO PCT/CN2023/079179 patent/WO2024093076A1/en unknown
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| Publication number | Publication date |
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| WO2024093076A1 (en) | 2024-05-10 |
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