CN110867581A - High-voltage high-energy-density quick-charging soft-package lithium ion battery - Google Patents

High-voltage high-energy-density quick-charging soft-package lithium ion battery Download PDF

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CN110867581A
CN110867581A CN201911041430.7A CN201911041430A CN110867581A CN 110867581 A CN110867581 A CN 110867581A CN 201911041430 A CN201911041430 A CN 201911041430A CN 110867581 A CN110867581 A CN 110867581A
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negative pole
density
positive pole
lithium ion
pole piece
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吴保明
侯春霞
贾秋荣
赖营帅
方送生
任洪涛
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Zhengzhou Bak Battery Co Ltd
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Zhengzhou Bak Battery 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
    • 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
    • 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
    • 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
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • 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
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    • 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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Abstract

The invention relates to the technical field of lithium ion batteries, and particularly provides a high-voltage high-energy-density quick-charging flexible-packaging lithium ion battery which comprises a positive pole piece, a negative pole piece, a diaphragm, electrolyte and an aluminum-plastic film for packaging the lithium ion battery, wherein the positive pole piece comprises a positive pole material and a current collector, the positive pole material is coated on the surface of the current collector, the positive pole material comprises lithium cobalt oxide, a positive pole conductive agent and a binder PVDF, the surface density of the positive pole material coating is 288g/m2Of positive electrode sheetsThe compacted density is 3.9g/cm3(ii) a The negative pole piece comprises a negative pole material and a current collector, wherein the negative pole material is coated on the surface of the current collector and comprises artificial graphite, a negative pole conductive agent, a binder CMC and a binder SBR, and the surface density of the coating of the negative pole material is 140-160g/m2The compacted density of the negative pole piece is 1.6g/cm3. Compared with a commercial battery with the upper limit voltage of 4.4V, the battery has the upper limit voltage of 4.45V, the energy density is improved by 5%, the energy density reaches 680Wh/L, 3C rate charging is realized, more than 80% of electricity can be charged in 20min, 3C charging cycles are performed for 500 times, and the retention rate is about 85%.

Description

High-voltage high-energy-density quick-charging soft-package lithium ion battery
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a high-voltage high-energy-density quick-charging flexible package lithium ion battery.
Background
With the development of science and technology, the application of digital products covers every aspect of people's life, and has become an essential part of people's life. With the function of the mobile phone becoming more and more abundant, the power consumption thereof is also increasing, and the battery can not meet the requirement after being charged once a day. The key for improving the cruising time of the equipment is the battery, the improvement of the energy density of the battery can improve the cruising ability to a certain extent, but the energy density is gradually close to the bottleneck at present, and meanwhile, the safety performance of the battery is deteriorated under higher energy density. Fast charging has come into play as a new charging method. Compared with conventional charging, the quick charging can charge more electric quantity in a short time, and long-time endurance of equipment is met.
Since 2014 high-voltage fast charging is proposed by high-pass, the fast charging is more and more appeared in the visual field of people as a bright spot of a mobile phone. The specifications of quick charging chargers adopted by main middle and high-end mobile phones in 2018 are mostly 9V/2A (18W), 5V/4A (20W), 5V/4.5A (22.5W) and 4.5V/5A (22.5W), the initial charging multiplying power is concentrated between 1C and 1.3C, the energy density is concentrated on 600 + 670Wh/L, and how to realize faster charging under higher energy density is the development trend of future batteries. However, the energy density and the quick charge are contradictory problems, and the energy density of the battery is inevitably influenced when the battery is charged at a high rate.
Disclosure of Invention
The invention aims to provide a high-voltage high-energy-density quick-charging flexible-package lithium ion battery, compared with a commercial 4.4V battery with an upper limit voltage, the upper limit voltage reaches 4.45V, the energy density is improved by 5%, the energy density reaches 680Wh/L, 3C rate charging can be realized, more than 80% of electric quantity can be charged in 20min, the 3C charging cycle is 500 times, and the retention rate is about 85%.
The technical scheme adopted by the invention is as follows: a high-voltage high-energy-density quick-charging soft-package lithium ion battery comprises a positive pole piece, a negative pole piece, a diaphragm, electrolyte and an aluminum-plastic film for packaging the lithium ion battery,
the positive pole piece comprises a positive pole material and a current collector, the positive pole material is uniformly coated on the surface of the current collector, the positive pole material comprises lithium cobaltate, a positive pole conductive agent and a binder PVDF, the surface density of the positive pole material coating is 288g/m2The compaction density of the positive pole piece is 3.8-4.2g/cm3；
The negative pole piece comprises a negative pole material and a current collector, wherein the negative pole material is uniformly coated on the surface of the current collector, the negative pole material comprises artificial graphite, a negative pole conductive agent, a binder CMC and a binder SBR, and the surface density of the coating of the negative pole material is 140-160g/m2(ii) a The compacted density of the negative pole piece is 1.5-1.7g/cm3，
The diaphragm is made of PP, PE, PP + PE composite materials, the thickness of the diaphragm is 5-12 mu m, the surface of the diaphragm is coated with ceramic, PVDF, ceramic + PVDF in a mixed mode, the thickness of a single-side coating is 1-6 mu m, and the porosity of the coating is more than 40%;
the conductivity of the electrolyte is more than 8.5 mS/cm;
the thickness of the aluminum-plastic film is 73 micrometers.
Preferably, the positive pole piece comprises a positive pole material and a current collector, the positive pole material is uniformly coated on the surface of the current collector, and the current collector is a metal plate
The positive electrode material comprises lithium cobaltate, a positive electrode conductive agent and a binder PVDF, and the surface density of the positive electrode material coating is 288g/m2The compacted density of the positive pole piece is 3.9g/cm3；
The negative pole piece comprises a negative pole material and a current collectorThe negative electrode material is uniformly coated on the surface of the current collector, the negative electrode material comprises artificial graphite, a negative electrode conductive agent, a binder CMC and a binder SBR, and the surface density of the coating of the negative electrode material is 140-160g/m2The compacted density of the negative pole piece is 1.6g/cm3；
The diaphragm is made of PP, PE, PP + PE composite materials, the thickness of the diaphragm is 5 mu m, the surface of the diaphragm is coated with ceramic, PVDF, ceramic + PVDF in a mixed mode, the thickness of a single-side coating is 1.5 mu m, and the porosity of the coating is more than 40%;
the conductivity of the electrolyte is more than 8.5 mS/cm;
the thickness of the aluminum-plastic film is 73 micrometers.
Preferably, the gram capacity of the lithium cobaltate is more than 175mAh/g, and the mass percentage of the lithium cobaltate in the positive electrode material is 95-98.5%.
Preferably, the positive conductive agent is one or a mixture of more of conductive graphite, conductive carbon black and carbon nanotubes; the mass percentage of the positive electrode conductive agent in the positive electrode material is 0.3-3%.
Preferably, the mass percent of the binder PVDF in the positive electrode material is 0.5-2%.
Preferably, the surface of the artificial graphite is subjected to soft carbon coating treatment, the gram capacity of the artificial graphite is more than 350mAh/g, and the mass percentage of the artificial graphite in the negative electrode material is 95-97.5%.
Preferably, the negative electrode conductive agent is one or a mixture of more of conductive graphite, conductive carbon black and carbon nanotubes; the mass percentage of the negative electrode conductive agent in the negative electrode material is 0.3-5%.
Preferably, the mass percent of the binder CMC in the negative electrode material is 0.6-2%, and the mass percent of the binder SBR in the negative electrode material is 1.0-2%.
Preferably, the conductivity of the electrolyte is 8.8 mS/cm.
Preferably, the current collectors in the positive electrode plate and the negative electrode plate are aluminum foils, and the thickness of the aluminum foils is 10 μm.
The invention has the advantages that: the lithium ion battery provided by the invention integrates scientific collocation and type selection of the anode material, the cathode material, the conductive agent and the electrolyte, breaks through the technical difficulty that the existing high-energy density and quick-charging technology are considered at the same time, not only greatly improves the capacity density of the battery, but also realizes high-rate charging.
Compared with a commercial 4.4V battery with the upper limit voltage, the battery has the upper limit voltage reaching 4.45V, the energy density is improved by 5 percent, and the energy density reaches 680 Wh/L. The positive plate of the battery has the compacted density of 3.8-4.2g/cm3The performance of the battery is superior under the condition of the compaction density, the compaction density is too small, the volume energy density of the battery is influenced, and the charging speed is influenced by the overlarge compaction density.
3C multiplying power charging can be realized, more than 80% of electric quantity can be charged in 20min, 3C charging is circulated for 500 times, and the retention rate is about 85%. The capacity of the negative plate is over 7 percent relative to the positive plate, and the surface density of the negative plate is 140-160g/m2The surface of the negative plate with too low surface density is easy to scratch, the surface density is too high, lithium is easy to separate during charging, and the cycle performance is influenced.
Drawings
Fig. 1 is a graph showing the charging rate of 3C charging of the battery prepared in example 1 of the present invention.
Fig. 2 is a voltage-capacity graph of the battery prepared in example 1 according to the present invention, which was subjected to 3C charging and 0.7C discharging.
Fig. 3 is a graph showing the 3C charging and 0.7C cycle discharging of the battery prepared in example 1 of the present invention.
Fig. 4 is a graph showing the 3C charging and 0.7C cycle discharging of the battery prepared in example 2 of the present invention.
Detailed Description
The present invention is described in further detail below with reference to a high voltage, high energy density, fast charging, and flexible packaging lithium ion battery.
Example 1
A high-voltage high-energy-density quick-charging soft-package lithium ion battery comprises a positive pole piece, a negative pole piece, a diaphragm, electrolyte and an aluminum-plastic film for packaging the lithium ion battery,
the positive pole piece comprises a positive pole material and a current collector, the positive pole material is uniformly coated on the surface of the current collector, and the positive pole material comprises cobalt acid
Lithium, positive electrode conductive agent and PVDF binder, and the surface density of the positive electrode material coating is 252g/m2The compacted density of the positive pole piece is 3.9g/cm3；
The negative pole piece comprises a negative pole material and a current collector, wherein the negative pole material is uniformly coated on the surface of the current collector, the negative pole material comprises artificial graphite, a negative pole conductive agent, a binder CMC and a binder SBR, and the surface density of the coating of the negative pole material is 160g/m2The compacted density of the negative pole piece is 1.6g/cm3；
The diaphragm is made of PP, PE, PP + PE composite materials, the thickness of the diaphragm is 5 mu m, the surface of the diaphragm is coated with ceramic, PVDF, ceramic + PVDF in a mixed mode, the thickness of a single-side coating is 1.5 mu m, and the porosity of the coating layer is larger than 40%;
wherein the conductivity of the electrolyte is 8.8 mS/cm;
wherein the thickness of the aluminum plastic film is 73 μm.
Wherein the gram capacity of the lithium cobaltate is more than 175mAh/g, and the mass percentage of the lithium cobaltate in the positive electrode material is 98%.
Wherein the positive electrode conductive agent is a carbon nano tube; the mass percentage of the positive electrode conductive agent in the positive electrode material is 1%.
Wherein, the mass percent of the binder PVDF in the anode material is 1%.
Wherein the surface of the artificial graphite is subjected to soft carbon coating treatment, the gram capacity of the artificial graphite is more than 350mAh/g, and the mass percentage of the artificial graphite in the negative electrode material is 96.4%.
Wherein the negative electrode conductive agent is conductive carbon black; the mass percentage of the negative electrode conductive agent in the negative electrode material is 0.96%.
Wherein the mass percent of the binder CMC in the negative electrode material is 1.2%, and the mass percent of the binder SBR in the negative electrode material is 1.44%.
Wherein, the current collectors in the positive pole piece and the negative pole piece are aluminum foils, and the thickness of the aluminum foils is 10 mu m.
Example 2
A high-voltage high-energy-density quick-charging soft-package lithium ion battery comprises a positive pole piece, a negative pole piece, a diaphragm, electrolyte and an aluminum-plastic film for packaging the lithium ion battery,
the positive pole piece comprises a positive pole material and a current collector, the positive pole material is uniformly coated on the surface of the current collector, the positive pole material comprises lithium cobaltate, a positive pole conductive agent and a binder PVDF, the surface density of the positive pole material coating is 288g/m2The compacted density of the positive pole piece is 3.9g/cm3；
The negative pole piece comprises a negative pole material and a current collector, wherein the negative pole material is uniformly coated on the surface of the current collector, the negative pole material comprises artificial graphite, a negative pole conductive agent, a binder CMC and a binder SBR, and the surface density of the coating of the negative pole material is 140g/m2(ii) a The compacted density of the negative pole piece is 1.6g/cm3，
The diaphragm is made of PP, PE, PP + PE composite materials, the thickness of the diaphragm is 5 mu m, the surface of the diaphragm is coated with ceramic, PVDF, ceramic + PVDF in a mixed mode, the thickness of a single-side coating is 1.5 mu m, and the porosity of the coating layer is larger than 40%;
wherein the conductivity of the electrolyte is 8.8 mS/cm;
wherein the thickness of the aluminum plastic film is 73 μm.
Wherein the gram capacity of the lithium cobaltate is more than 175mAh/g, and the mass percentage of the lithium cobaltate in the positive electrode material is 98.3%.
Wherein the positive electrode conductive agent is a carbon nano tube; the mass percentage of the positive electrode conductive agent in the positive electrode material is 0.7%.
Wherein, the mass percent of the binder PVDF in the anode material is 1%.
Wherein the surface of the artificial graphite is subjected to soft carbon coating treatment, the gram capacity of the artificial graphite is more than 350mAh/g, and the mass percentage of the artificial graphite in the negative electrode material is 96.4%.
Wherein the negative electrode conductive agent is conductive carbon black; the mass percentage of the negative electrode conductive agent in the negative electrode material is 0.96%.
Wherein the mass percent of the binder CMC in the negative electrode material is 1.2%, and the mass percent of the binder SBR in the negative electrode material is 1.44%.
Wherein the conductivity of the electrolyte is 8.8 mS/cm.
Wherein, the current collectors in the positive pole piece and the negative pole piece are aluminum foils, and the thickness of the aluminum foils is 10 mu m.
Example 3
A high-voltage high-energy-density quick-charging soft-package lithium ion battery comprises a positive pole piece, a negative pole piece, a diaphragm, electrolyte and an aluminum-plastic film for packaging the lithium ion battery,
the positive pole piece comprises a positive pole material and a current collector, the positive pole material is uniformly coated on the surface of the current collector, the positive pole material comprises lithium cobaltate, a positive pole conductive agent and a binder PVDF, the surface density of the positive pole material coating is 260g/m2The compacted density of the positive pole piece is 3.8g/cm3；
The negative pole piece comprises a negative pole material and a current collector, wherein the negative pole material is uniformly coated on the surface of the current collector, the negative pole material comprises artificial graphite, a negative pole conductive agent, a binder CMC and a binder SBR, and the surface density of the coating of the negative pole material is 150g/m2(ii) a The compacted density of the negative pole piece is 1.5g/cm3，
The diaphragm is made of PP, PE, PP + PE composite materials, the thickness of the diaphragm is 9 mu m, the surface of the diaphragm is coated with ceramic, PVDF, ceramic + PVDF in a mixed mode, the thickness of a single-side coating is 1 mu m, and the porosity of the coating is larger than 40%;
wherein the conductivity of the electrolyte is 8.8 mS/cm.
Wherein the thickness of the aluminum plastic film is 73 μm.
Wherein the gram capacity of the lithium cobaltate is more than 175mAh/g, and the mass percentage of the lithium cobaltate in the positive electrode material is 95%.
Wherein, the positive electrode conductive agent is a mixture of conductive graphite and carbon nano tubes; the mass percentage of the positive electrode conductive agent in the positive electrode material is 3%.
Wherein, the mass percent of the binder PVDF in the anode material is 2%.
Wherein the surface of the artificial graphite is subjected to soft carbon coating treatment, the gram capacity of the artificial graphite is more than 350mAh/g, and the mass percentage of the artificial graphite in the negative electrode material is 95%.
Wherein, the negative conductive agent is a mixture of conductive carbon black and carbon nano tubes; the mass percentage of the negative electrode conductive agent in the negative electrode material is 2.4%.
Wherein, the mass percent of the binder CMC in the negative electrode material is 0.6 percent, and the mass percent of the binder SBR in the negative electrode material is 2 percent.
Wherein, the current collectors in the positive pole piece and the negative pole piece are aluminum foils, and the thickness of the aluminum foils is 10 mu m.
Example 4
A high-voltage high-energy-density quick-charging soft-package lithium ion battery comprises a positive pole piece, a negative pole piece, a diaphragm, electrolyte and an aluminum-plastic film for packaging the lithium ion battery,
the positive pole piece comprises a positive pole material and a current collector, the positive pole material is uniformly coated on the surface of the current collector, the positive pole material comprises lithium cobaltate, a positive pole conductive agent and a binder PVDF, and the surface density of the positive pole material coating is 270g/m2The compacted density of the positive pole piece is 4.2g/cm3；
The negative pole piece comprises a negative pole material and a current collector, wherein the negative pole material is uniformly coated on the surface of the current collector, the negative pole material comprises artificial graphite, a negative pole conductive agent, a binder CMC and a binder SBR, and the surface density of the coating of the negative pole material is 145g/m2(ii) a The compacted density of the negative pole piece is 1.7g/cm3，
The diaphragm is made of PP, PE, PP + PE composite materials, the thickness of the diaphragm is 12 micrometers, the surface of the diaphragm is coated with ceramic, PVDF, ceramic + PVDF in a mixed mode, the thickness of a single-side coating is 6 micrometers, and the porosity of the coating is larger than 40%;
wherein the conductivity of the electrolyte is 8.8 mS/cm.
Wherein the thickness of the aluminum plastic film is 73 μm.
Wherein the gram capacity of the lithium cobaltate is more than 175mAh/g, and the mass percentage of the lithium cobaltate in the positive electrode material is 98.2%.
Wherein, the positive conductive agent is a mixture of conductive carbon black and carbon nano tubes; the mass percentage of the positive electrode conductive agent in the positive electrode material is 0.3%.
Wherein, the mass percent of the binder PVDF in the positive electrode material is 0.5%.
Wherein the surface of the artificial graphite is subjected to soft carbon coating treatment, the gram capacity of the artificial graphite is more than 350mAh/g, and the mass percentage of the artificial graphite in the negative electrode material is 97.5%.
Wherein, the negative conductive agent is a mixture of conductive carbon black and carbon nano tubes; the mass percentage of the negative electrode conductive agent in the negative electrode material is 0.3%.
Wherein, the mass percent of the binder CMC in the negative electrode material is 0.6 percent, and the mass percent of the binder SBR in the negative electrode material is 1.6 percent.
Wherein, the current collectors in the positive pole piece and the negative pole piece are aluminum foils, and the thickness of the aluminum foils is 10 mu m.
Example 5
A high-voltage high-energy-density quick-charging soft-package lithium ion battery comprises a positive pole piece, a negative pole piece, a diaphragm, electrolyte and an aluminum-plastic film for packaging the lithium ion battery,
the positive pole piece comprises a positive pole material and a current collector, the positive pole material is uniformly coated on the surface of the current collector, the positive pole material comprises lithium cobaltate, a positive pole conductive agent and a binder PVDF, and the surface density of the positive pole material coating is 252g/m2The compacted density of the positive pole piece is 3.9g/cm3；
The negative pole piece comprises a negative pole material and a current collector, wherein the negative pole material is uniformly coated on the surface of the current collector, the negative pole material comprises artificial graphite, a negative pole conductive agent, a binder CMC and a binder SBR, and the surface density of the coating of the negative pole material is 160g/m2(ii) a The compacted density of the negative pole piece is 1.6g/cm3，
The diaphragm is made of PP, PE, PP + PE composite materials, the thickness of the diaphragm is 5 mu m, the surface of the diaphragm is coated with ceramic, PVDF, ceramic + PVDF in a mixed mode, the thickness of a single-side coating is 1 mu m, and the porosity of the coating is larger than 40%;
wherein the conductivity of the electrolyte is 8.8 mS/cm.
Wherein the thickness of the aluminum plastic film is 73 μm.
Wherein the gram capacity of the lithium cobaltate is more than 175mAh/g, and the mass percentage of the lithium cobaltate in the positive electrode material is 98.2%.
Wherein, the positive electrode conductive agent is a mixture of conductive graphite and carbon nano tubes; the mass percentage of the positive electrode conductive agent in the positive electrode material is 0.3%.
Wherein, the mass percent of the binder PVDF in the positive electrode material is 0.5%.
Wherein the surface of the artificial graphite is subjected to soft carbon coating treatment, the gram capacity of the artificial graphite is more than 350mAh/g, and the mass percentage of the artificial graphite in the negative electrode material is 95%.
Wherein the negative electrode conductive agent is a mixture of conductive graphite and carbon nanotubes; the mass percentage of the negative electrode conductive agent in the negative electrode material is 1%.
Wherein the mass percent of the binder CMC in the negative electrode material is 2 percent, and the mass percent of the binder SBR in the negative electrode material is 2 percent.
Wherein, the current collectors in the positive pole piece and the negative pole piece are aluminum foils, and the thickness of the aluminum foils is 10 mu m.
Testing and detecting:
the following steps are adopted in the above examples 1, 2, 3, 4 and 5 to prepare the high-voltage high-energy-density fast-charging flexible package lithium ion battery,
(1) preparing a positive pole piece: fully and uniformly mixing N-methyl pyrrolidone, lithium cobaltate, a conductive agent and a binder PVDF to prepare slurry, uniformly coating the prepared slurry on the surface of a current collector by using a coating machine, drying and rolling to prepare a positive pole piece;
(2) preparing a negative pole piece: fully and uniformly mixing deionized water, artificial graphite, a conductive agent, a binder CMC and a binder SBR to prepare slurry, uniformly coating the prepared slurry on the surface of a current collector by using a coating machine, and drying and rolling to prepare a negative pole piece;
(3) preparing a battery: and (2) winding the prepared positive pole piece, negative pole piece and diaphragm into a winding core by using a winding mechanism, then placing the winding core into a film shell formed by an aluminum-plastic film, preparing a battery cell to be injected by top sealing and side sealing, then placing the battery cell into a drying oven for baking, injecting liquid after baking is finished, and then performing conventional aging, pre-charging, secondary sealing and capacity grading to obtain the soft package lithium ion battery.
The battery of example 1 was charged at 3C, which is shown in fig. 1, and the charging speed was high; the charging and discharging curve chart 2 of the 3C charging and 0.7C discharging of the battery shows that the voltage is between 3.0V and 4.45V, and the battery has good stability; after the battery is subjected to charge and discharge cycle tests of 3C charging and 0.7C discharging, as shown in FIG. 3, the retention rate of the battery is about 85% after 500 cycles, and the service life is good.
The battery of example 2 was subjected to a charge/discharge cycle test of 3C charge and 0.7C discharge, and as shown in fig. 4, the retention of the battery after 500 cycles was about 87.5%, which resulted in a good service life.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides a high voltage, high energy density quick-charging soft package lithium ion battery, includes positive pole piece, negative pole piece, diaphragm, electrolyte and lithium ion battery encapsulation and uses the plastic-aluminum membrane, its characterized in that:
the positive pole piece comprises a positive pole material and a current collector, the positive pole material is uniformly coated on the surface of the current collector, the positive pole material comprises lithium cobaltate, a positive pole conductive agent and a binder PVDF, the surface density of the positive pole material coating is 288g/m2The compaction density of the positive pole piece is 3.8-4.2g/cm3；
The negative pole piece comprises a negative pole material and a current collector, wherein the negative pole material is uniformly coated on the surface of the current collector, the negative pole material comprises artificial graphite, a negative pole conductive agent, a binder CMC and a binder SBR, and the surface density of the coating of the negative pole material is 140-160g/m2The compacted density of the negative pole piece is 1.5-1.7g/cm3；
The diaphragm is made of PP, PE, PP + PE composite materials, the thickness of the diaphragm is 5-12 mu m, the surface of the diaphragm is coated with ceramic, PVDF, ceramic + PVDF in a mixed mode, the thickness of a single-side coating is 1-6 mu m, and the porosity of the coating is more than 40%;
the conductivity of the electrolyte is more than 8.5 mS/cm;
the thickness of the aluminum-plastic film is 73 micrometers.
2. The high voltage, high energy density, fast charging, flexible packaging lithium ion battery of claim 1, wherein:
the positive pole piece comprises a positive pole material and a current collector, wherein the positive pole material is uniformly coated on the surface of the current collector, and the positive pole material comprises
Comprises lithium cobaltate, a positive electrode conductive agent and a binder PVDF, wherein the surface density of the positive electrode material coating is 288g/m2The compacted density of the positive pole piece is 3.9g/cm3；
The negative pole piece comprises a negative pole material and a current collector, wherein the negative pole material is uniformly coated on the surface of the current collector, the negative pole material comprises artificial graphite, a negative pole conductive agent, a binder CMC and a binder SBR, and the surface density of the coating of the negative pole material is 140-160g/m2The compacted density of the negative pole piece is 1.6g/cm3；
The diaphragm is made of PP, PE, PP + PE composite materials, the thickness of the diaphragm is 5 mu m, the surface of the diaphragm is coated with ceramic, PVDF, ceramic + PVDF in a mixed mode, the thickness of a single-side coating is 1.5 mu m, and the porosity of the coating is more than 40%;
the conductivity of the electrolyte is more than 8.5 mS/cm;
the thickness of the aluminum-plastic film is 73 micrometers.
3. A high voltage, high energy density, fast charging flexible packaging lithium ion battery as claimed in claim 1 or 2, characterized in that: the gram capacity of the lithium cobaltate is more than 175mAh/g, and the mass percentage of the lithium cobaltate in the positive electrode material is 95-98.5%.
4. A high voltage, high energy density, fast charging flexible packaging lithium ion battery as claimed in claim 1 or 2, characterized in that: the positive conductive agent is one or a mixture of more of conductive graphite, conductive carbon black and carbon nano tubes; the mass percentage of the positive electrode conductive agent in the positive electrode material is 0.3-3%.
5. A high voltage, high energy density, fast charging flexible packaging lithium ion battery as claimed in claim 1 or 2, characterized in that: the mass percentage of the binder PVDF in the positive electrode material is 0.5-2%.
6. A high voltage, high energy density, fast charging flexible packaging lithium ion battery as claimed in claim 1 or 2, characterized in that: the surface of the artificial graphite is subjected to soft carbon coating treatment, the gram capacity of the artificial graphite is more than 350mAh/g, and the mass percentage of the artificial graphite in the negative electrode material is 95-97.5%.
7. A high voltage, high energy density, fast charging flexible packaging lithium ion battery as claimed in claim 1 or 2, characterized in that: the negative electrode conductive agent is one or a mixture of more of conductive graphite, conductive carbon black and carbon nano tubes; the mass percentage of the negative electrode conductive agent in the negative electrode material is 0.3-5%.
8. A high voltage, high energy density, fast charging flexible packaging lithium ion battery as claimed in claim 1 or 2, characterized in that: the mass percent of the binder CMC in the negative electrode material is 0.6-2%, and the mass percent of the binder SBR in the negative electrode material is 1.0-2%.
9. A high voltage, high energy density, fast charging flexible packaging lithium ion battery as claimed in claim 1 or 2, characterized in that: the conductivity of the electrolyte is 8.8 mS/cm.
10. The high-voltage high-energy-density fast-charging soft-packaged lithium ion battery as claimed in claim 1 or 2, wherein the current collectors in the positive electrode plate and the negative electrode plate are both aluminum foils, and the thickness of the aluminum foils is 10 μm.
CN201911041430.7A 2019-10-30 2019-10-30 High-voltage high-energy-density quick-charging soft-package lithium ion battery Pending CN110867581A (en)

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