CN215266367U - Low-temperature chargeable lithium ion battery - Google Patents

Low-temperature chargeable lithium ion battery Download PDF

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Publication number
CN215266367U
CN215266367U CN202121242460.7U CN202121242460U CN215266367U CN 215266367 U CN215266367 U CN 215266367U CN 202121242460 U CN202121242460 U CN 202121242460U CN 215266367 U CN215266367 U CN 215266367U
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coating
positive
negative
lithium ion
ion battery
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郭娜娜
白科
李冠毅
徐小明
谢爱亮
孙玉龙
田雪梅
余翔
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Jiangxi ANC New Energy Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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

Abstract

The utility model belongs to the technical field of lithium batteries, in particular to a low-temperature charging type lithium ion battery, which comprises a positive plate and a negative plate, wherein the positive plate comprises a positive current collector and a positive coating, the positive coating comprises a positive internal coating and a positive external coating, the positive internal coating is coated on the positive current collector, the positive external coating is coated on the positive internal coating, and the surface of the positive external coating is provided with a plurality of through holes I; the negative plate comprises a negative current collector and a negative coating, the negative coating comprises a negative internal coating and a negative external coating, the negative internal coating is coated on the negative current collector, the negative external coating is coated on the negative internal coating, and the surface of the negative external coating is provided with a plurality of second through holes. The utility model provides high lithium ion battery's low temperature charging performance, lithium ion battery-10 ℃ low temperature 1C charge do not analyse lithium, -10 ℃ low temperature 0.33C 0.5C cyclic life > 1000 weeks, energy density is big, the cycling performance is excellent.

Description

Low-temperature chargeable lithium ion battery
Technical Field
The utility model belongs to the technical field of the lithium cell, concretely relates to low temperature chargeable type lithium ion battery.
Background
The lithium ion battery has the advantages of high specific energy, light weight, long service life, no memory effect and the like, and is widely applied to various civil electronic equipment and the fields of electric automobiles, energy storage, mobile power supplies and the like. With the popularization and popularity of electric vehicles, more and more power batteries are applied to the electric vehicles, and a typical problem faced by power type lithium ion batteries is that the driving mileage in winter is sharply reduced, the use of the lithium battery in a low-temperature environment is limited, and the lithium battery cannot be charged at a low temperature except that the discharge capacity is seriously degraded. Although some new energy automobiles can preheat the battery pack before charging in a low-temperature environment, the problems that the battery core is heated unevenly, electric energy is wasted, the vehicle is on fire due to abnormal heating and the like still exist.
At low temperatures, the reduction in the transmission rate of lithium ions is a major cause of the reduction in the charge-discharge efficiency of lithium ion batteries. The properties of the positive electrode tab, the negative electrode tab, the electrolyte, the current collector, and the like may all cause a decrease in the transmission rate of lithium ions. CN104409767A discloses a low-temperature lithium ion secondary battery, wherein the positive electrode electro-active substance is spinel lithium manganate, the negative electrode active substance is spinel lithium titanate, and superconducting carbon black, Super-P, VGCF or carbon nano-tube and other conductive agents are added into the positive electrode material and the negative electrode material; and adopting a solvent containing 1, 2-propylene glycol carbonate and ethyl acetate to obtain the electrolyte with the melting point of less than-40 ℃. The first efficiency of the low-temperature lithium ion battery is not obviously improved, the energy density is low, and the low-temperature performance of the lithium ion battery needs to be further improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome prior art not enough, provide a low temperature chargeable type lithium ion battery to improve lithium ion battery's low temperature charging performance.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a low-temperature rechargeable lithium ion battery includes an electrode assembly, a separator, a non-aqueous electrolyte, and a case;
the electrode assembly includes a positive electrode tab and a negative electrode tab, the electrode assembly and the nonaqueous electrolytic solution being sealed in the case;
the positive plate comprises a positive current collector and a positive coating, the positive coating comprises a positive internal coating and a positive external coating, the positive internal coating is coated on the positive current collector, the positive external coating is coated on the positive internal coating, and the surface of the positive external coating is provided with a plurality of first through holes;
the negative pole piece includes negative pole mass flow body and negative coating, the negative coating includes negative pole inner coating and negative pole external coating, negative pole inner coating is coated on the negative pole mass flow body, negative pole external coating is coated on the negative pole inner coating, negative pole external coating surface has a plurality of through-holes two.
Furthermore, the thickness of the single-side coating on the inner part of the positive electrode is 20-100 mu m, and the thickness of the single-side coating on the outer part of the positive electrode is 50-200 mu m.
Furthermore, the thickness of the single-side coating on the inner part of the negative electrode is 20-60 mu m, and the thickness of the single-side coating on the outer part of the negative electrode is 50-100 mu m.
Further, the first through hole accounts for 1-10% of the porosity of the external coating of the positive electrode.
Furthermore, the diameter of the first through hole is 0.1-2 μm.
Further, the second through hole accounts for 1-15% of the porosity of the external coating of the positive electrode.
Furthermore, the diameter of the second through hole is 0.1-2 μm.
Wherein the positive electrode sheet and the negative electrode sheet are stacked or wound.
The utility model improves the low-temperature charging performance of the lithium ion battery, the lithium ion battery does not separate lithium when charged at the low temperature of-10 ℃ and 1C, and the cycle life of 0.33C/0.5C at the low temperature of-10 ℃ is more than 1000 weeks; the low-temperature capacity retention rate at the low temperature of-20 ℃ reaches more than 85 percent, the energy density reaches (128.5-129.5) wh/kg, the capacity retention rate of 500-time cycle performance reaches (96.8-98.0)%, and the method has the characteristics of good low-temperature performance, high energy density and excellent cycle performance.
Drawings
FIG. 1 is a schematic cross-sectional view of an electrode assembly of the present invention;
FIG. 2 is an enlarged schematic view of portion A of FIG. 1;
fig. 3 is a schematic side cross-sectional view of the coating of the positive plate of the present invention;
fig. 4 is a plan view of the coating of the positive electrode sheet of the present invention;
fig. 5 is a schematic side cross-sectional view of the coating of a negative plate of the present invention;
fig. 6 is a plan view of the coating of the negative electrode sheet of the present invention;
the designations in FIGS. 1-6 have the following meanings: the cathode plate comprises a cathode plate 1, an anode plate 2, an electrode assembly 3, a diaphragm 4, an aluminum foil 5 and a copper foil 6; 1-1 part of an internal coating of the positive electrode, 1-2 parts of an external coating of the positive electrode and 1-2-1 parts of a through hole I; 2-1 of a cathode internal coating, 2-2 of a cathode external coating and 2-2-1 of a through hole II.
Detailed Description
In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is the orientation or positional relationship shown based on the drawings, and the object is only to facilitate the description of the present invention and to simplify the description, and it is not intended to indicate or imply that the indicated component must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
Examples
A low-temperature charging type lithium ion battery, as shown in FIGS. 1 to 6, includes an electrode assembly 3, a separator 4, a nonaqueous electrolytic solution, and a case; the electrode assembly 3 includes a positive electrode tab 1 and a negative electrode tab 2, the electrode assembly and the nonaqueous electrolytic solution being sealed in the case;
the positive plate 1 comprises a positive current collector (an aluminum foil 5 with the thickness of 20 mu m) and a positive coating, the positive coating comprises a positive internal coating 1-1 and a positive external coating 1-2, the positive internal coating 1-1 is coated on the surface of the aluminum foil 5 with the thickness of 20 mu m, the positive external coating 1-2 is coated on the positive internal coating 1-1, and the surface of the positive external coating 1-2 is provided with a plurality of through holes I1-2-1;
the negative plate 2 comprises a negative current collector (copper foil 6 with the thickness of 4.5 mu m) and a negative coating, the negative coating comprises a negative internal coating 2-1 and a negative external coating 2-2, the negative internal coating 2-1 is coated on the surface of the copper foil 6 with the thickness of 4.5 mu m, the negative external coating 2-2 is coated on the negative internal coating 2-1, and the surface of the negative external coating 2-2 is provided with a plurality of through holes 2-2-1.
The porosity of the first through hole 1-2-1 in the external coating 1-2 of the anode is 7.5%, the diameter of the first through hole 1-2-1 is 1.5 mu m, the porosity of the second through hole 2-2-1 in the external coating 1-2 of the anode is 8.0%, and the diameter of the second through hole 2-2-1 is 1.2 mu m.
The single-side thickness of the anode internal coating 1-1 coated on the aluminum foil 5 is 60 μm, and the single-side thickness of the anode external coating 1-2 coated on the anode internal coating 1-1 is 125 μm.
The thickness of the single surface of the negative electrode internal coating 2-1 coated on the copper foil 6 is 40 microns, and the thickness of the single surface of the negative electrode external coating 2-2 coated on the negative electrode internal coating 2-1 is 75 microns.
The positive plate is prepared by the following steps:
(1) adding 98g of lithium iron phosphate, 1.5g of single-walled carbon nanotube and 5g of binder PVDF into 120g of solvent NMP, and stirring and mixing to obtain anode internal coating slurry;
(2) coating the slurry of the internal coating of the anode on the surface of an aluminum foil with the diameter of 20 mu m, and drying for 2h at the temperature of 80 ℃;
(3) adding 92g of lithium iron phosphate, 2.5g of Ketjen black and 3g of binder PVDF into 120g of solvent NMP, and stirring and mixing to obtain anode external coating slurry;
(4) coating the external coating slurry of the positive electrode on the surface of the internal coating of the positive electrode, and drying for 2h at 80 ℃ to obtain the positive plate.
The negative plate is prepared by the following steps:
(1) adding 96g of artificial graphite, 1g of conductive agent SP and 5g of binder SBR into 120g of solvent deionized water, and stirring and mixing to obtain cathode internal coating slurry;
(2) coating the slurry of the internal coating of the negative electrode on the surface of a copper foil with the thickness of 4.5 mu m, and drying for 2h at the temperature of 80 ℃;
(3) adding 92g of natural graphite, 1.5g of conductive agent ECP and 2g of binder PVDF into 120g of solvent deionized water, and stirring and mixing to obtain cathode external coating slurry;
(4) coating the cathode external coating slurry on the surface of the cathode internal coating, and drying at 80 ℃ for 2h to obtain the cathode sheet.
The battery cell is assembled by taking a Celgard 2400 membrane as a diaphragm according to the prior art; injecting electrolyte to prepare the 5Ah soft package lithium ion battery; using LiPF6-EC + DEC (EC, DEC volume ratio 1: 1, LiPF6Concentration of 1.3mol/L) as an electrolyte.
Comparative example
In the lithium ion battery of the comparative example, 20 μm aluminum foil is used as a positive electrode current collector, and lithium iron phosphate is used as a positive electrode material; copper foil with the thickness of 4.5 mu m is used as a negative current collector, and artificial graphite is used as a negative material; in the electrolyte, LiPF6The concentration of the (C) is 1mol/L, the solvent is a mixed solvent consisting of EC, DEC and PC, and the weight ratio of EC, DEC and PC is 1: 1; the diaphragm adopts Celgard 2400 membrane, assembles into 5Ah laminate polymer battery.
The low-temperature performance of the lithium ion batteries of the respective examples and comparative examples was measured, and the results are shown in table 1 below.
TABLE 1 Low temperature Performance of lithium ion batteries of examples and comparative examples
Figure BDA0003101051940000041
The invention improves the low-temperature charging performance of the lithium ion battery, the lithium ion battery does not precipitate lithium when charged at the low temperature of-10 ℃ and 1C, the cycle life of the lithium ion battery is more than 1000 weeks at the low temperature of-10 ℃ and 0.33C/0.5C, and the low-temperature performance is good, the energy density is large, and the cycle performance is excellent.
The details of the present invention not described in detail in the specification are well known to those skilled in the art. The above-mentioned embodiment is only the preferred embodiment of the present invention, all the technical matters of the present invention are any simple modification, modification and substitution changes to the above embodiments, all belong to the technical solution of the present invention.

Claims (8)

1. A low-temperature charging type lithium ion battery is characterized by comprising an electrode assembly, a diaphragm, a non-aqueous electrolyte and a shell, wherein the electrode assembly comprises a positive plate and a negative plate, and the electrode assembly and the non-aqueous electrolyte are sealed in the shell;
the positive plate comprises a positive current collector and a positive coating, the positive coating comprises a positive internal coating and a positive external coating, the positive internal coating is coated on the positive current collector, the positive external coating is coated on the positive internal coating, and the surface of the positive external coating is provided with a plurality of first through holes;
the negative pole piece includes negative pole mass flow body and negative coating, the negative coating includes negative pole inner coating and negative pole external coating, negative pole inner coating is coated on the negative pole mass flow body, negative pole external coating is coated on the negative pole inner coating, negative pole external coating surface has a plurality of through-holes two.
2. The low-temperature charging type lithium ion battery according to claim 1, wherein the thickness of the single-sided coating layer on the inner part of the positive electrode is 20-100 μm, and the thickness of the single-sided coating layer on the outer part of the positive electrode is 50-200 μm.
3. The low-temperature charging type lithium ion battery according to claim 1, wherein the thickness of the single-sided coating layer on the inner side of the negative electrode is 20-60 μm, and the thickness of the single-sided coating layer on the outer side of the negative electrode is 50-100 μm.
4. The low-temperature charging type lithium ion battery according to claim 1, wherein the first through hole accounts for 1-10% of the porosity of the external coating of the positive electrode.
5. The low-temperature charging type lithium ion battery according to claim 4, wherein the diameter of the first through hole is 0.1-2 μm.
6. The low-temperature charging type lithium ion battery according to claim 1, wherein the porosity of the second through hole in the external coating of the positive electrode is 1-15%.
7. The low-temperature charging type lithium ion battery according to claim 6, wherein the diameter of the second through hole is 0.1-2 μm.
8. The low-temperature charging type lithium ion battery according to claim 1, wherein the positive electrode sheet and the negative electrode sheet are stacked or wound.
CN202121242460.7U 2021-06-04 2021-06-04 Low-temperature chargeable lithium ion battery Active CN215266367U (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Publications (1)

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PE01 Entry into force of the registration of the contract for pledge of patent right
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Denomination of utility model: A low temperature rechargeable lithium ion battery

Effective date of registration: 20221024

Granted publication date: 20211221

Pledgee: Jiangxi Guangxin Rural Commercial Bank Co.,Ltd.

Pledgor: JIANGXI ANC NEW ENERGY TECHNOLOGY Co.,Ltd.

Registration number: Y2022980019421