CN115693033A - Lithium battery and manufacturing method thereof - Google Patents
Lithium battery and manufacturing method thereof Download PDFInfo
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- CN115693033A CN115693033A CN202211465793.5A CN202211465793A CN115693033A CN 115693033 A CN115693033 A CN 115693033A CN 202211465793 A CN202211465793 A CN 202211465793A CN 115693033 A CN115693033 A CN 115693033A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 107
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 107
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 41
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 22
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 21
- 239000011255 nonaqueous electrolyte Substances 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 239000007774 positive electrode material Substances 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 8
- 239000007773 negative electrode material Substances 0.000 claims description 7
- 230000004308 accommodation Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 2
- 230000002427 irreversible effect Effects 0.000 abstract description 6
- 239000011149 active material Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000013589 supplement Substances 0.000 description 6
- 210000004027 cell Anatomy 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000001502 supplementing effect Effects 0.000 description 5
- 239000003792 electrolyte Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910001148 Al-Li alloy Inorganic materials 0.000 description 2
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 2
- 229910021383 artificial graphite Inorganic materials 0.000 description 2
- 239000001989 lithium alloy Substances 0.000 description 2
- 150000002642 lithium compounds Chemical class 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to the field of batteries, in particular to a lithium battery and a manufacturing method thereof. The lithium battery includes a battery case having an accommodating space, a non-aqueous electrolyte solution accommodated in the accommodating space, one or more battery pole pieces soaked in the non-aqueous electrolyte solution; the battery pole core comprises a negative pole piece, a diaphragm and a positive pole piece; a separation layer is arranged between the battery pole cores and/or outside the battery pole cores; the separation layer is an aluminum alloy containing metal lithium; the separate layer communicates with the positive pole of battery utmost point core, and produces electronic channel between the positive pole of battery utmost point core, and then releases lithium ion in order to compensate the irreversible lithium loss of lithium cell in the cycle process from the separate layer, makes the cycle life of lithium cell obtain showing and promotes.
Description
Technical Field
The invention relates to the field of batteries, in particular to a lithium battery and a manufacturing method thereof.
Background
The lithium battery has the characteristics of long cycle life, high energy conversion efficiency and the like, and is concerned by the energy storage industry. In the process of cyclic charge and discharge of the lithium battery, lithium ions are repeatedly inserted into and inserted out of the positive and negative electrode materials, and the active materials are repeatedly contracted and expanded along with the positive and negative electrode materials, so that the active materials are inactivated, the active lithium is gradually reduced, and finally the available capacity of the battery is gradually reduced. Therefore, it is a common practice in the industry to supplement active lithium to a battery to improve the battery life. At present, the lithium supplement technology in the industry includes two technical routes of lithium supplement for a negative electrode and lithium supplement for a positive electrode.
The lithium supplementing technology for the negative electrode is mainly used for supplementing active lithium to the negative electrode to provide an additional lithium source, but because the metal lithium is very active, the requirements on the operating environment and equipment are very strict, and the problems of high production cost and low product percent of pass exist. The positive electrode lithium supplement technology is mainly characterized in that a lithium compound with reducing capability is added into a positive electrode material of a battery, and the lithium compound is oxidized and decomposed in the first charging process to release an irreversible lithium source so as to supplement an additional lithium source. This method is relatively simple to implement compared with the negative electrode lithium replenishing technique, but has a problem that the lithium replenishing efficiency is low and the decomposition product of the added lithiated compound remains. Therefore, the lithium supplementing effect of the scheme is not good.
Disclosure of Invention
Therefore, in order to solve the above technical problems, it is necessary to provide a lithium battery and a method for manufacturing the same, so as to solve the problem of poor lithium supplementing effect of the conventional lithium battery.
The invention provides a lithium battery, which comprises a battery shell with an accommodating space, a non-aqueous electrolyte solution accommodated in the accommodating space, and one or more battery pole pieces soaked in the non-aqueous electrolyte solution; the battery pole core comprises a negative pole piece, a diaphragm and a positive pole piece; a separation layer is arranged between the battery pole cores and/or outside the battery pole cores;
the separation layer is an aluminum alloy containing metal lithium; the separation layer is communicated with the positive pole of the battery pole core.
Optionally, the content of the metallic lithium in the aluminum alloy ranges from 0.1% to 10%.
Optionally, the sum of the first capacity of lithium ions releasable by the separation layer and the second capacity of lithium ions releasable by the positive active material of the battery pole core is less than or equal to the third capacity of lithium ions which can be accommodated by the negative active material of the battery pole core.
Optionally, the separation layer has a porous structure.
Optionally, the separation layer is in communication with the positive electrode tab by welding.
A method of manufacturing a lithium battery, the lithium battery being any one of the lithium batteries described above, the method comprising:
firstly, preparing a battery pole core;
secondly, cutting the aluminum alloy with the porous structure into the size the same as that of the positive plate of the battery pole core to obtain a separation layer;
thirdly, arranging the separation layer on at least one of the upper surface and the lower surface of the battery pole core and/or between the battery pole cores, and connecting the separation layer with a positive pole lug of the battery pole core through welding;
and fourthly, placing the separation layer and the battery pole core together in an accommodating space of a battery shell to obtain the lithium battery.
According to the lithium battery and the manufacturing method thereof, the separation layer containing the metal lithium is communicated with the positive electrode of the battery pole core, so that an electron channel is generated between the separation layer and the positive electrode of the battery pole core, lithium ions are released from the separation layer under the driving of potential difference and are embedded into the positive electrode of the battery pole core through the electrolyte, and the irreversible lithium loss of the battery in the charge and discharge cycle process is compensated. Meanwhile, during the discharge process of the lithium battery, lithium ions precipitated from the separation layer do not back-intercalate into the separation layer. Therefore, the cycle life of the lithium battery is remarkably prolonged.
Additionally, the invention provides the lithium battery, the lithium supplementing amount is controlled by adjusting the using amount of the aluminum-lithium alloy and the lithium content in the aluminum alloy, the manufacturing process is simple and easy to operate, the aluminum-lithium alloy is stable in the air, the requirement on the environment is low, and the cost of the whole manufacturing process is low.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic view of an assembly of a single pole piece of a battery according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a battery core according to an embodiment of the present invention;
FIG. 3 is a schematic view of an assembly process of a separator and a battery pole piece in a lithium battery according to an embodiment of the invention;
FIG. 4 is a schematic view of a stacked assembly of a separator layer and a battery core of a lithium battery according to an embodiment of the invention;
fig. 5 is a graph comparing 0.5C cycle life of a battery in accordance with an embodiment of the present invention.
Reference numbers in the drawings illustrate: 1-battery pole core; 2-a separation layer; 101-a membrane; 102-negative pole piece; 103-positive plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Example 1
In the present embodiment, there is provided a lithium battery including a battery case having an accommodation space, a nonaqueous electrolyte solution accommodated in the accommodation space, one or more battery pole pieces soaked in the nonaqueous electrolyte solution; the battery pole core comprises a negative pole piece, a diaphragm and a positive pole piece; a separation layer is arranged between the battery pole cores and/or outside the battery pole cores;
the separator layer comprises an aluminum alloy of metallic lithium; the separation layer is communicated with the positive electrode of the battery pole core.
Understandably, the battery case has a housing space for housing the nonaqueous electrolyte solution, the battery core 1, the separator 2, and the like. The battery shell can be an aluminum shell or other metal materials, and the material of the battery shell is not limited and can be arranged according to actual needs. The nonaqueous electrolyte solution is an electrolyte solution having ion conductivity. The battery core 1 includes a positive electrode and a negative electrode. Specifically, the battery core 1 is composed of a positive electrode sheet 103, a negative electrode sheet 102, and a separator 101 for insulating between the positive electrode sheet 103 and the negative electrode sheet 102, and the like, stacked or wound. The battery core 1 shown in fig. 1 and 2 is composed of a stack of a positive electrode sheet 103, a negative electrode sheet 102, a separator 101 for insulating the positive electrode sheet 103 from the negative electrode sheet 102, and the like. Both the positive electrode tab 103 and the negative electrode tab 102 contain an active material. Specifically, the active material of the positive electrode sheet 103 may be a lithium iron phosphate material, and the active material of the negative electrode sheet 102 may be artificial graphite. The separator 2 is an aluminum alloy containing metallic lithium. Meanwhile, the separator 2 is in communication with the positive electrode of the battery cell, that is, the separator 2 is in communication with the positive electrode tab 103 of the battery cell 1. The separator is not particularly limited in size, but preferably, the separator 2 has the same size as the positive electrode sheet 103. When the separation layer 2 is communicated with the positive pole of the battery pole core, the separation layer 2 and the positive pole of the battery pole core generate an electronic channel, lithium ions are released from the separation layer 2 under the action of potential difference between the separation layer and the positive pole and enter electrolyte, and then the lithium ions are embedded into the positive pole of the battery pole core to compensate the irreversible lithium loss of the lithium battery in the circulating charge and discharge process. The irreversible lithium loss refers to the loss of active lithium gradually reduced as the active materials of the positive and negative electrodes repeatedly contract and expand in the process of cyclic charge and discharge of the lithium battery, so that the active materials are inactivated or the surface films of the positive and negative electrodes are continuously damaged and repaired.
In the lithium battery provided by the invention, the separation layer 2 containing the metal lithium is communicated with the positive electrode of the battery pole core 1, so that an electron channel is generated between the separation layer 2 and the positive electrode of the battery pole core 1. Under the drive of the potential difference, lithium ions enter the electrolyte from the separation layer 2 and are inserted into the positive electrode of the battery pole core 1 through the electrolyte, so that the irreversible lithium loss of the lithium battery in the charge-discharge cycle process is compensated. Simultaneously, in the lithium cell discharge process, the lithium ion that releases from the separate layer 2 can not return and imbed in the separate layer 2, so, makes the life cycle of lithium cell obtain showing and promotes.
Example 2
The sum of a first capacity of lithium ions releasable by the separation layer 2 during cyclic charge and discharge and a second capacity of lithium ions releasable by the positive electrode active material of the battery pole core 1 is less than or equal to a third capacity of lithium ions which can be accommodated by the negative electrode active material of the battery pole core 1.
Understandably, the first capacity refers to the total capacity of all the separator layers 2 containing metallic lithium installed in the lithium battery, which can additionally release supplemental lithium ions to the battery pole piece 1. The second capacity refers to a total capacity of lithium ions releasable by the positive active materials of all the battery cells 1 of the lithium battery. The third capacity refers to the total capacity of lithium ions that the negative active material of all battery pole cores 1 of the lithium battery can be replenished with. In order to ensure that the positive electrode of the battery can provide all lithium sources, the negative electrode can be completely accommodated to prevent the lithium from generating dendrites excessively, and the amount of the aluminum alloy cannot be too large. The amount of the aluminum alloy, and the lithium content in the aluminum alloy can be controlled to control the added lithium source, so that a desired value of the battery life can be obtained.
Example 3
The material of the separator 2 is an aluminum alloy containing metallic lithium. Wherein, the aluminum alloy can also comprise one or more of elements such as silicon, magnesium, manganese, titanium, zirconium, boron, strontium, phosphorus, sulfur, carbon and the like. And are not limited thereto. Optionally, the content of the metallic lithium in the aluminum alloy ranges from 0.1% to 10%. That is, within the above-mentioned content range of the metallic lithium, the chemical stability of the aluminum alloy is good.
Example 4
When the content of metallic lithium in the aluminum alloy is too low, the amount of lithium supplied is insufficient, and when the content is too high, the chemical stability of the aluminum alloy is deteriorated. Preferably, the content of metallic lithium in the aluminum alloy may be in the range of 0.4% to 7% to ensure the amount of lithium supplied and the stability of the aluminum alloy within the content range.
Example 5
The separator 2 has a porous structure, and the pores are channels through which lithium is released from the separator. The holes may be uniformly spaced on the separation layer 2, or may be arranged according to actual requirements, and are not limited herein. Meanwhile, the separating layer also has the heat dissipation effect, so that the lithium battery can better dissipate heat in the charging and discharging process.
Example 6
The separator 2 may be provided according to the form of the battery core 1. Specifically, when the battery core 1 is in a wound shape, the separator 2 is provided on at least one of the upper and lower surfaces of the battery core 1.
Example 7
The separator 2 may be provided according to the form of the battery core 1. Specifically, when the form of the battery core 1 is a stacked (square or rectangular parallelepiped) shape, as shown in fig. 3, the separator layers 2 are stacked on both upper and lower surfaces of the battery core 1.
Example 8
The separator 2 may be provided according to the form of the battery core 1. Specifically, when the pole piece is formed by a combined stack (square or rectangular parallelepiped) of two battery pole pieces 1, as shown in fig. 4, separator layers 2 are stacked between the two battery pole pieces 1 and on both surfaces of the pole piece outer layers.
Example 9
The separation layer 2 is welded on the positive pole lug of the lithium battery. That is, the separator 2 is joined to the tabs in all the positive electrode sheets 103 of the battery core 1 by ultrasonic welding. In the embodiment, the separation layer 2 and the positive electrode lug are connected by welding, so that the connection is more stable and reliable, and the separation layer 2 is not influenced to release and separate out lithium ions to the positive electrode lug.
Example 10
In this embodiment, a method for preparing lithium batteries is provided, where the method for preparing lithium batteries corresponds to the lithium batteries in the above embodiments one to one. The detailed steps of the lithium battery preparation method are as follows:
first, a battery core 1 is prepared. The positive active material of the positive plate 103 of the battery pole core 1 is prepared from a lithium iron phosphate material, an aluminum foil with the thickness of 15u is used as a current collector, the negative active material of the negative plate 102 is prepared from artificial graphite, a copper foil with the thickness of 8um is used as a current collector, and the diaphragm 101 is made from polypropylene.
In the second step, a porous aluminum alloy (for example, an aluminum alloy having a metal lithium content of 2% and a thickness of 1 mm) is cut into the same size as the positive electrode sheet 103 to obtain the separator 2 having a porous structure. Wherein, the dimension length and width of the positive plate 103 are 100mm and 200mm; the dimension length and width of the negative plate 102 are 102 × 204mm; the dimension of the separation layer 2 is length x width 100mm x 200mm.
Wherein, the lithium-supplementing capacity of one separation layer is 4168.8mAh. The gram capacity of the metal lithium is 3860mAh/g, and the density of the aluminum alloy is 2.7g/cm 3 。
Thirdly, two separating layers 2 are respectively placed on the upper surface and the lower surface of the battery pole core 1, and the separating layers 2 are connected with the exposed lugs on all the positive plates 103 of the battery pole core 1 through ultrasonic welding. The negative electrode tabs 102 are also connected by ultrasonic welding through the exposed tabs thereof.
And fourthly, placing the separating layer 2 and the battery pole core 1 together in an accommodating space of the battery shell, injecting a non-aqueous electrolyte solution with preset capacity (set according to requirements) into the battery shell after the processes of sealing, baking and the like, and preparing the square aluminum shell lithium battery with the capacity of 100Ah after the processes of aging, formation, sealing of an injection hole, capacity grading and the like.
In comparative example 1 to example 10, the materials and processes for preparation were the same as in this example except that the separator 2 containing metallic lithium was not provided on the battery core 1. As shown in fig. 5, a cycle curve of the lithium battery prepared in the comparative example and the lithium battery prepared in the present example is shown. In fig. 5, the ordinate represents the capacity remaining percentage (%) of the lithium battery, and the abscissa represents the number (/ N) of cycles of the lithium battery. Curve 01 is the cycle plot of comparative example 1 and curve 02 is the cycle plot of the present example. As can be seen from fig. 5, the lithium battery of the present example has a greater number of battery cycles than the lithium battery of comparative example 1 at the same remaining rate of battery capacity. And the lithium battery of the present example had a higher rate of remaining battery capacity than the lithium battery of comparative example 1 for the same number of battery cycles. That is, the lithium battery prepared by the present example had a greater number of cycles and a longer battery life than the lithium battery prepared by comparative example 1.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (6)
1. A lithium battery characterized by comprising a battery case having an accommodation space, a nonaqueous electrolyte solution accommodated in the accommodation space, one or more battery pole pieces soaked in the nonaqueous electrolyte solution; the battery pole core comprises a negative plate, a diaphragm and a positive plate; a separation layer is arranged between the battery pole cores and/or outside the battery pole cores;
the separation layer is an aluminum alloy containing metal lithium; the separation layer is communicated with the positive pole of the battery pole core.
2. The lithium battery of claim 2, wherein said aluminum alloy contains said metallic lithium in an amount ranging from 0.1% to 10%.
3. The lithium battery of claim 1, wherein a sum of a first capacity of lithium ions releasable by the separator and a second capacity of lithium ions releasable by the positive active material of the battery core is less than or equal to a third capacity of lithium ions receivable by the negative active material of the battery core.
4. The lithium battery of claim 1, wherein the separator has a porous structure.
5. The lithium battery of claim 1 wherein the separator layer is in communication with the positive electrode tab by welding.
6. A method for manufacturing a lithium battery, characterized in that the lithium battery is a lithium battery as claimed in any one of claims 1 to 8, said method comprising:
firstly, preparing a battery pole core;
secondly, cutting the aluminum alloy with the porous structure into the size the same as that of the positive plate of the battery pole core to obtain a separation layer;
thirdly, arranging the separation layer on at least one of the upper surface and the lower surface of the battery pole core and/or between the battery pole cores, and connecting the separation layer with a positive pole lug of the battery pole core through welding;
and fourthly, placing the separation layer and the battery pole core together in an accommodating space of a battery shell to obtain the lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211465793.5A CN115693033A (en) | 2022-11-22 | 2022-11-22 | Lithium battery and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211465793.5A CN115693033A (en) | 2022-11-22 | 2022-11-22 | Lithium battery and manufacturing method thereof |
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| CN115693033A true CN115693033A (en) | 2023-02-03 |
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| CN202211465793.5A Pending CN115693033A (en) | 2022-11-22 | 2022-11-22 | Lithium battery and manufacturing method thereof |
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