CN219998291U - Lithium iron phosphate battery - Google Patents

Lithium iron phosphate battery Download PDF

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Publication number
CN219998291U
CN219998291U CN202221520124.9U CN202221520124U CN219998291U CN 219998291 U CN219998291 U CN 219998291U CN 202221520124 U CN202221520124 U CN 202221520124U CN 219998291 U CN219998291 U CN 219998291U
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China
Prior art keywords
positive
winding core
pole piece
negative electrode
iron phosphate
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CN202221520124.9U
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Chinese (zh)
Inventor
朱希平
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Hubei Ruisai New Energy Technology Co ltd
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Hubei Ruisai New Energy Technology Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/411—Organic material
    • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
    • H01M50/426—Fluorocarbon polymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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 relates to a lithium iron phosphate battery which comprises a shell, a winding core, a lithium bis (fluorosulfonyl) imide electrolyte, a positive pole piece and a negative pole piece. The roll core is provided with a containing hole, and the circumferential surface of the roll core is provided with a plurality of through holes; the positive pole piece and the negative pole piece are wound on the winding core, the positive pole piece comprises a positive pole foil and a positive pole active substance, the negative pole piece comprises a negative pole foil and a modified graphite negative pole active substance, the modified graphite negative pole active substance is arranged on the negative pole foil, and the modified graphite negative pole active substance is coated on one side of the negative pole graphene layer far away from the negative pole foil; the positive electrode active material is coated on one side of the positive electrode graphene layer far away from the positive electrode foil; the thicknesses of the positive electrode graphene layer and the negative electrode graphene layer are 1-3 microns; the battery cell is arranged in the shell; the lithium bis (fluorosulfonyl) imide electrolyte is disposed in the housing, and the accommodating hole of the winding core accommodates the lithium bis (fluorosulfonyl) imide electrolyte. The lithium iron phosphate battery has stable electrochemical performance and combines the advantages of low-temperature discharge and high-temperature energy storage.

Description

Lithium iron phosphate battery
The present utility model claims priority from the application number 202210076888.1 of the chinese patent office entitled "a lithium iron phosphate battery" filed 24 of 2022, 01, the entire contents of which are incorporated herein by reference.
Technical Field
The utility model relates to the technical field of batteries, in particular to a lithium iron phosphate battery.
Background
Batteries are required for electric bicycles, electric motorcycles, electric vehicles, electric ships, electric unmanned aerial vehicles, and the like. The charge and discharge cycle times of the lithium iron phosphate battery can reach more than 2000 times, the charge and discharge cycle times are 7 times of that of a lead acid battery, the weight of the lithium iron phosphate battery is 4 times of that of the lithium acid battery, the lithium iron phosphate battery is between the lead acid battery and the lithium battery, the lithium iron phosphate battery is high in high temperature resistance, high in safety coefficient, quick in charging, free of explosion and combustion after being charged with large voltage and large current, capable of recovering after being discharged and zeroed, free of memory effect and low in price, but the lithium iron phosphate battery has the defects of low temperature resistance and obviously poor efficacy below zero.
Disclosure of Invention
The utility model aims to provide a lithium iron phosphate battery, so that the lithium iron phosphate battery has the advantages of low-temperature discharge and high-temperature resistant energy storage.
In order to achieve the above object, the present utility model provides a lithium iron phosphate battery comprising:
the coil core is provided with a containing hole in a penetrating way along the axial direction of the coil core, the peripheral surface of the coil core is provided with a plurality of through holes, and the through holes are communicated with the containing hole;
the positive pole piece and the negative pole piece are wound on the winding core to form an electric core with the winding core, a layer of negative pole piece is arranged between two adjacent layers of positive pole pieces, the positive pole piece comprises a positive pole foil and a positive pole active substance, the positive pole active substance is arranged on the positive pole foil, the positive pole active substance comprises manganese-doped lithium iron phosphate, and graphene and carbon nanotubes are added in the lithium iron phosphate; the negative electrode plate comprises a negative electrode foil and a modified graphite negative electrode active substance, wherein the modified graphite negative electrode active substance is arranged on the negative electrode foil, a negative electrode graphene layer is coated on the negative electrode foil, and the modified graphite negative electrode active substance is coated on one side, far away from the negative electrode foil, of the negative electrode graphene layer; the positive electrode foil is coated with a positive electrode graphene layer, and the positive electrode active material is coated on one side of the positive electrode graphene layer far away from the positive electrode foil; the thicknesses of the positive electrode graphene layer and the negative electrode graphene layer are 1-3 micrometers;
the battery cell is arranged in the shell, a flange is arranged on the inner side of the shell, one end of the battery cell is abutted against the flange, and the other end of the battery cell is abutted against the bottom wall of the shell;
and the lithium bis (fluorosulfonyl) imide electrolyte is arranged in the shell, and the accommodating hole of the winding core accommodates the lithium bis (fluorosulfonyl) imide electrolyte.
Optionally, the through hole is a round hole.
Optionally, the winding core is in a cylindrical structure, a plurality of through holes are arranged in a row at intervals along the axial direction of the winding core, and a plurality of rows of through holes are arranged at intervals along the circumferential direction of the winding core.
Optionally, the distance between two adjacent through holes along the axial direction of the winding core is larger than the diameter of the through hole.
Optionally, a polytetrafluoroethylene membrane is arranged between the positive pole piece and the negative pole piece.
From the above, the technical scheme provided by the utility model has the advantages that the lithium bis (fluorosulfonyl) imide electrolyte is not decomposed below 200 ℃, the high-temperature stability is high, the low-temperature performance is excellent, and the high internal resistance of the SEI film in a low-temperature environment can be effectively reduced. Graphene and carbon nanotubes are added into the manganese-doped lithium iron phosphate positive electrode material, so that low-temperature conductivity is increased, and low-temperature discharge is facilitated. The winding core plays a role of supporting and stabilizing the positive pole piece and the negative pole piece and has a function of storing the lithium bis (fluorosulfonyl) imide electrolyte, and the winding core is provided with a through accommodating hole and a plurality of through holes communicated with the accommodating hole, so that the lithium bis (fluorosulfonyl) imide electrolyte lost at high temperature can be timely supplemented, the electrolyte can be quickly fed into the positive pole piece and the negative pole piece, and normal discharge of the lithium iron phosphate battery is ensured at high temperature. The polytetrafluoroethylene diaphragm is adopted to effectively prevent the high-temperature diaphragm from shrinking, so that short circuit is avoided; increasing the stability and durability of the separator in high temperature environments.
Drawings
Fig. 1 is a cross-sectional view of a lithium iron phosphate battery provided by an embodiment of the present utility model;
FIG. 2 is a schematic view of a winding core according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a positive electrode sheet according to an embodiment of the present utility model;
fig. 4 is a schematic structural diagram of a negative electrode tab according to an embodiment of the present utility model.
In the figure:
1. a winding core; 11. a receiving hole; 12. a through hole;
2. a positive electrode sheet; 21. a positive electrode foil; 22. a positive electrode active material; 23. a positive electrode graphene layer;
3. a negative electrode plate; 31. a negative electrode foil; 32. a modified graphite negative electrode active material; 33. a negative graphene layer;
4. a housing; 41. a flange;
5. a polytetrafluoroethylene membrane.
Detailed Description
The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.
In the present utility model, directional terms such as "upper", "lower", "left", "right", "inner" and "outer" are used for convenience of understanding, and thus do not limit the scope of the present utility model unless otherwise specified.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The embodiment provides the lithium iron phosphate battery, so that the lithium iron phosphate battery has stable electrochemical performance, combines the advantages of low-temperature discharge and high-temperature energy storage, can be normally used in high-cold and high-temperature environments, and has wide application range and excellent safety performance.
As shown in fig. 1, the lithium iron phosphate battery provided in this embodiment includes a case 4, a winding core 1, a lithium bis (fluorosulfonyl) imide electrolyte, a positive electrode sheet 2, and a negative electrode sheet 3. The positive pole piece 2 and the negative pole piece 3 are wound on the winding core 1 to form an electric core together with the winding core 1, and a layer of negative pole piece 3 is arranged between two adjacent layers of positive pole pieces 2. The assembly mode of the battery cell can be as follows: before the positive pole piece 2 and the negative pole piece 3 are wound on the winding core 1, the positive pole piece 2 and the negative pole piece 3 are stacked and then wound on the winding core 1 to form the winding core 1.
As shown in fig. 1 and 2, the battery cell is disposed in the case 4, and the lithium bis (fluorosulfonyl) imide electrolyte is disposed in the case 4. The winding core 1 is provided with a receiving hole 11 penetrating along the axial direction thereof, the circumferential surface of the winding core 1 is provided with a plurality of through holes 12, and the through holes 12 are communicated with the receiving hole 11. And the accommodating hole 11 of the winding core 1 accommodates lithium bis (fluorosulfonyl) imide electrolyte.
As shown in fig. 3, the positive electrode sheet 2 includes a positive electrode foil 21 and a positive electrode active material 22, the positive electrode active material 22 is disposed on the positive electrode foil 21, the positive electrode active material 22 includes manganese-doped lithium iron phosphate, and graphene and carbon nanotubes are added to the lithium iron phosphate.
The lithium bis (fluorosulfonyl) imide electrolyte is not decomposed below 200 ℃, has high-temperature stability and excellent low-temperature performance, and can effectively reduce the high internal resistance of the SEI film in a low-temperature environment. Graphene and carbon nanotubes are added into the manganese-doped lithium iron phosphate positive electrode material, so that low-temperature conductivity is increased, and low-temperature discharge is facilitated. The winding core 1 plays a role of supporting and stabilizing the positive pole piece 2 and the negative pole piece 3 and has a function of storing the lithium bis (fluorosulfonyl) imide electrolyte, and the winding core 1 is provided with a through accommodating hole 11 and a plurality of through holes 12 communicated with the accommodating hole 11, so that the lithium bis (fluorosulfonyl) imide electrolyte lost at high temperature can be timely supplemented, the electrolyte can be quickly fed into the positive pole piece 2 and the negative pole piece 3, and normal discharge of the lithium iron phosphate battery is ensured at high temperature.
As shown in fig. 4, the negative electrode sheet 3 includes a negative electrode foil 31 and a modified graphite negative electrode active material 32, and the modified graphite negative electrode active material 32 is provided on the negative electrode foil 31. The modified graphite anode active material 32 forms a stable SEI (solid electrolyte interphase) module with lithium bis (fluorosulfonyl) imide electrolyte in a high-temperature environment, so that the high-temperature storage life of the battery can be effectively prolonged. Further, the anode foil 31 may be a copper foil. The modified graphite anode active material 32 includes spherical graphite, amorphous carbon coated on the surface of the spherical graphite to connect adjacent two spherical graphites. Preferably, the modified graphite anode active material 32 is manufactured by coating a layer of phenolic resin slurry on the surface of spherical graphite and then roasting at 250-800 ℃ to obtain amorphous carbon connecting the spherical graphite.
The negative electrode foil 31 is coated with a negative electrode graphene layer 33, and the modified graphite negative electrode active material 32 is coated on one side of the negative electrode graphene layer 33 far away from the negative electrode foil 31.
As shown in fig. 3, the positive electrode foil 21 may be an aluminum foil. The positive electrode foil 21 is coated with a positive electrode graphene layer 23, and the positive electrode active material 22 is coated on one side of the positive electrode graphene layer 23 far away from the positive electrode foil 21. The negative electrode graphene layer 33 and the positive electrode graphene layer 23 can effectively increase conductivity. Preferably, the thicknesses of the positive electrode graphene layer 23 and the negative electrode graphene layer 33 are each 1 to 3 micrometers.
The particle size of the lithium iron phosphate is D50=1.5-6 microns, the doping amount of the graphene is 0.5-5%, the graphene is of a layered structure, the number of layers of the graphene is 3-10, and the graphene is prepared by a mechanical method. The doping amount of the carbon nano tube is 0.5-5%, and the small-diameter and thin-wall carbon nano tube is adopted, so that the conductivity is effectively improved.
A polytetrafluoroethylene diaphragm 5 is arranged between the positive pole piece 2 and the negative pole piece 3. Specifically, polytetrafluoroethylene membrane 5, negative pole piece 3, polytetrafluoroethylene membrane 5, positive pole piece 2 are coiled after being stacked and form the electric core. The polytetrafluoroethylene membrane 5 has a microporous structure so as to allow charged ions to pass through while avoiding direct contact between the positive electrode sheet 2 and the negative electrode sheet 3 and avoiding short circuits.
As shown in fig. 1 and 2, the through hole 12 is preferably a circular hole. The round holes can avoid stress concentration and reduce or avoid deformation of the winding core 1 in the bearing process.
Further, the winding core 1 has a cylindrical structure, a plurality of through holes 12 are arranged in a row at intervals along the axial direction of the winding core 1, and a plurality of rows of through holes 12 are arranged at intervals along the circumferential direction of the winding core 1. The arrangement of the through holes 12 can improve the speed of supplementing the lithium bis (fluorosulfonyl) imide electrolyte for the positive electrode plate 2 and the negative electrode plate 3.
The distance between two adjacent through holes 12 along the axial direction of the winding core 1 is larger than the diameter of the through holes 12, so that the structural strength of the winding core 1 is effectively ensured, and the deformation of the battery cell is avoided.
As shown in fig. 1, preferably, a flange 41 is disposed on the inner side of the housing 4, one end of the battery cell abuts against the flange 41, and the other end abuts against the bottom wall of the housing 4, so that the battery cell is effectively prevented from moving in the housing 4, and the stability of the battery cell is improved. The flange 41 may be formed by punching, i.e., after the battery cell is prevented from being in the case 4, a designated portion of the case 4 is pressed inward using a punching apparatus to form the flange 41.
While the utility model has been described in detail in the foregoing general description, embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.

Claims (5)

1. A lithium iron phosphate battery, comprising:
the winding core (1), wherein the winding core (1) is provided with a containing hole (11) along the axial direction of the winding core, the circumferential surface of the winding core (1) is provided with a plurality of through holes (12), and the through holes (12) are communicated with the containing hole (11);
the lithium iron phosphate battery comprises a positive pole piece (2) and a negative pole piece (3), wherein the positive pole piece (2) and the negative pole piece (3) are wound on a winding core (1) so as to form an electric core with the winding core (1), a layer of the negative pole piece (3) is arranged between two adjacent layers of the positive pole pieces (2), the positive pole piece (2) comprises a positive foil (21) and a positive active substance (22), the positive active substance (22) is arranged on the positive foil (21), the positive active substance (22) comprises manganese-doped lithium iron phosphate, and graphene and carbon nanotubes are added in the lithium iron phosphate; the negative electrode piece (3) comprises a negative electrode foil (31) and a modified graphite negative electrode active material (32), wherein the modified graphite negative electrode active material (32) is arranged on the negative electrode foil (31), a negative electrode graphene layer (33) is coated on the negative electrode foil (31), and the modified graphite negative electrode active material (32) is coated on one side, far away from the negative electrode foil (31), of the negative electrode graphene layer (33); the positive electrode foil (21) is coated with a positive electrode graphene layer (23), and the positive electrode active material (22) is coated on one side, far away from the positive electrode foil (21), of the positive electrode graphene layer (23); the thicknesses of the positive electrode graphene layer (23) and the negative electrode graphene layer (33) are 1-3 micrometers;
the battery cell is arranged in the shell (4), a flange (41) is arranged on the inner side of the shell (4), one end of the battery cell is abutted against the flange (41), and the other end of the battery cell is abutted against the bottom wall of the shell (4);
and the lithium bis (fluorosulfonyl) imide electrolyte is arranged in the shell (4), and the accommodating hole (11) of the winding core (1) accommodates the lithium bis (fluorosulfonyl) imide electrolyte.
2. The lithium iron phosphate battery according to claim 1, characterized in that the through hole (12) is a circular hole.
3. The lithium iron phosphate battery according to claim 2, wherein the winding core (1) has a cylindrical structure, a plurality of through holes (12) are arranged in a row at intervals along the axial direction of the winding core (1), and a plurality of rows of through holes (12) are arranged at intervals along the circumferential direction of the winding core (1).
4. A lithium iron phosphate battery according to claim 3, characterized in that the distance between two adjacent through holes (12) in the axial direction of the winding core (1) is larger than the diameter of the through holes (12).
5. The lithium iron phosphate battery according to claim 1, characterized in that a polytetrafluoroethylene membrane (5) is arranged between the positive pole piece (2) and the negative pole piece (3).
CN202221520124.9U 2022-01-24 2022-06-17 Lithium iron phosphate battery Active CN219998291U (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210076888.1A CN114094201A (en) 2022-01-24 2022-01-24 Lithium iron phosphate battery
CN2022100768881 2022-01-24

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CN219998291U true CN219998291U (en) 2023-11-10

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Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201623212U (en) * 2010-02-08 2010-11-03 宁德新能源科技有限公司 Cylindrical lithium ion battery
CN102208598B (en) * 2011-05-12 2014-03-12 中国科学院宁波材料技术与工程研究所 Electrode plate of graphene coating modified lithium secondary battery and manufacturing method thereof
CN202564476U (en) * 2012-04-11 2012-11-28 深圳市翔丰华科技有限公司 Graphite ball for lithium ion battery cathode
CN104681761A (en) * 2015-01-30 2015-06-03 中天储能科技有限公司 Lithium ion battery with long cycle life
CN105140566A (en) * 2015-08-03 2015-12-09 深圳新宙邦科技股份有限公司 Non-aqueous electrolyte of lithium ion battery and lithium ion battery
CN107623142A (en) * 2017-09-07 2018-01-23 山东鸿正电池材料科技有限公司 A kind of high power lithium ion power battery
TWI679796B (en) * 2017-12-27 2019-12-11 財團法人工業技術研究院 Cathode of lithium ion battery
CN111200113B (en) * 2018-11-16 2021-01-12 宁德时代新能源科技股份有限公司 Positive pole piece and electrochemical device

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