CN112271295A - Preparation method of negative electrode material without current collector of lithium ion battery - Google Patents

Preparation method of negative electrode material without current collector of lithium ion battery Download PDF

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Publication number
CN112271295A
CN112271295A CN202011252366.XA CN202011252366A CN112271295A CN 112271295 A CN112271295 A CN 112271295A CN 202011252366 A CN202011252366 A CN 202011252366A CN 112271295 A CN112271295 A CN 112271295A
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China
Prior art keywords
lithium ion
ion battery
preparation
current collector
negative electrode
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CN202011252366.XA
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Chinese (zh)
Inventor
罗大为
赵海雷
李顺生
曾廷威
何航
李运波
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Shenzhen Polytechnic
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Shenzhen Polytechnic
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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
    • H01M4/58—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
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

A preparation method of a negative electrode material without a current collector of a lithium ion battery comprises the following steps: step 1: taking several carbon fibers with the length of 3-6mm, and placing in 10% of HNO3Carrying out surface treatment in the solution for 4 hours; step 2: taking 50ml of deionized water, mixing the carbon fibers treated in the step 1 with a dispersant polyacrylamide according to a mass ratio of 8-10, and then carrying out ultrasonic dispersion on the mixed solution for 1 hour; and step 3: pouring the mixed solution obtained in the step 2 into a Buchner funnel filled with filter paper in advance, and removing filtrate in a vacuum filtration forming mode to obtain carbon fiber cloth with a certain thickness; and 4, step 4: and (3) drying the carbon fiber cloth obtained in the step (3) in a vacuum furnace to obtain the carbon foil. The carbon foil obtained by the invention can be directly used as the cathode of the lithium ion battery, and the process is simple (the traditional lithium ion battery is saved)Pole piece preparation of the pool preparation process), and has high mass specific capacity (a copper current collector is omitted), thereby having wide application prospect.

Description

Preparation method of negative electrode material without current collector of lithium ion battery
Technical Field
The invention relates to the field of negative electrode materials of lithium ion batteries, in particular to a preparation method of a negative electrode material without a current collector of a lithium ion battery.
Background
Lithium ion batteries have been increasingly used in various fields as a high-efficiency secondary battery. The lithium ion battery is composed of four main materials, namely a positive electrode material, a negative electrode material, electrolyte and a diaphragm. Among them, the negative electrode material is directly related to the capacity of the lithium ion battery. Currently, the commercial lithium ion battery negative electrode material is mainly graphite, and the preparation process comprises the steps of mixing graphite with a binder and a conductive agent according to a certain proportion, preparing the mixture into slurry, coating the slurry on the surface of a current collector copper foil to form a negative electrode plate, and then assembling the negative electrode plate and a positive electrode plate into the lithium ion battery. The negative electrode material of the lithium battery has the problems of low capacity and complex preparation process of the negative electrode pole piece.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the preparation method of the negative electrode material without the current collector of the lithium ion battery has the advantages that the preparation process of the negative electrode pole piece is omitted, a conductive agent, a binder and a copper foil current collector are omitted, the cost is reduced, the specific capacity of the negative electrode is greatly improved, and the overall performance of the lithium ion battery is improved.
In order to solve the technical problems, the invention provides the following technical scheme: a preparation method of a negative electrode material without a current collector of a lithium ion battery comprises the following steps:
step 1: taking several carbon fibers with the length of 3-6mm, and placing in 10% of HNO3Carrying out surface treatment in the solution for 4 hours;
step 2: taking 50ml of deionized water, mixing the carbon fibers treated in the step 1 with a dispersant polyacrylamide according to a mass ratio of 8-10, and then carrying out ultrasonic dispersion on the mixed solution for 1 hour;
and step 3: pouring the mixed solution obtained in the step 2 into a Buchner funnel filled with filter paper in advance, and removing filtrate in a vacuum filtration forming mode to obtain carbon fiber cloth with a certain thickness;
and 4, step 4: and (3) drying the carbon fiber cloth obtained in the step (3) in a vacuum furnace to obtain the carbon foil.
The technical scheme is further limited in that: in step 4, the drying conditions of the vacuum furnace are controlled as follows: pressure 0.2-0.4 MP; temperature 110-.
Compared with the prior art, the invention has the following beneficial effects: the invention not only omits the preparation process of the negative pole piece, but also omits the conductive agent, the adhesive and the copper foil current collector, greatly improves the specific capacity of the negative pole while reducing the cost, and further improves the overall performance of the lithium ion battery.
Drawings
Fig. 1 is a scanning electron microscope image of the composite anode material of example 1.
Fig. 2 is a graph of the cycle performance of the composite anode material of example 1.
Detailed Description
A preparation method of a negative electrode material without a current collector of a lithium ion battery is characterized by comprising the following steps:
step 1: taking a plurality of carbon fibers with certain length, and placing the carbon fibers in 10 percent of HNO3Carrying out surface treatment in the solution for 4 hours;
step 2: taking 50ml of deionized water, mixing the carbon fibers treated in the step 1 and the polyacrylamide serving as a dispersing agent according to a certain proportion, and then carrying out ultrasonic dispersion on the mixed solution for 1 hour;
and step 3: pouring the mixed solution obtained in the step 2 into a Buchner funnel filled with filter paper in advance, and removing filtrate in a vacuum filtration forming mode to obtain carbon fiber cloth with a certain thickness;
and 4, step 4: and (3) drying the carbon fiber cloth obtained in the step (3) in a vacuum furnace to obtain the carbon foil.
The length of the carbon fiber in the step 1 is controlled to be 3-6 mm.
In the step 2, the mass ratio of the carbon fiber to the polyacrylamide is controlled as follows: 8 to 10.
In step 4, the drying conditions of the vacuum furnace are controlled as follows: pressure 0.2-0.4 MP; temperature 110-.
Preparation of example 1
1g of carbon fiber with the length of 4mm is taken and placed in 10 percent of HNO3Carrying out surface treatment in the solution for 4 hours; dissolving the treated carbon fiber and 0.125g of polyacrylamide in 100ml of deionized water, and then carrying out ultrasonic dispersion on the mixed solution for 1 h; then, pouring the mixed solution into a Buchner funnel filled with filter paper in advance, and removing filtrate by adopting a vacuum filtration forming mode to obtain carbon fiber cloth with a certain thickness; and finally, drying the carbon fiber cloth in a vacuum furnace, wherein the pressure of the drying treatment is 0.2MPa, and the temperature is controlled to be 110 ℃, so that the carbon foil is obtained.
And (3) taking the carbon foil as a negative pole piece, and forming a button cell with the lithium piece to perform electrochemical performance test. The results show that at 100 mA g-1At a current density of (A), the first discharge capacity of the composite material was 351.7 mAh g-1The reversible capacity can be maintained at 209.4mAh g after 50 cycles-1And has better electrochemical performance.
Preparation examples 2 to 4 were prepared by changing the raw material contents and the process parameters in step 1, step 2 and step 4, and the other parts were the same, and preparation examples 1 to 4 were as shown in Table 1.
TABLE 1 preparation examples 1 to 4
Preparation of example 1 Preparation of example 2 Preparation of example 3 Preparation of example 4
Carbon fiber length/mm 4 5 6 3
Mass ratio of carbon fiber to polyacrylamide 8 9 10 10
Vacuum furnace Condition 0.3MPa, 110℃ 0.4MPa, 110℃ 0.4MPa, 120℃ 0.2MPa, 120℃
First discharge capacity/mAh.g-1 351.7 352.1 333.9 336.2
Reversible capacity/mAh.g-1 209.4 208.4 198.1 202.4

Claims (2)

1. A preparation method of a negative electrode material without a current collector of a lithium ion battery is characterized by comprising the following steps:
step 1: taking several carbon fibers with the length of 3-6mm, and placing in 10% of HNO3Carrying out surface treatment in the solution for 4 hours;
step 2: taking 50ml of deionized water, mixing the carbon fibers treated in the step 1 with a dispersant polyacrylamide according to a mass ratio of 8-10, and then carrying out ultrasonic dispersion on the mixed solution for 1 hour;
and step 3: pouring the mixed solution obtained in the step 2 into a Buchner funnel filled with filter paper in advance, and removing filtrate in a vacuum filtration forming mode to obtain carbon fiber cloth with a certain thickness;
and 4, step 4: and (3) drying the carbon fiber cloth obtained in the step (3) in a vacuum furnace to obtain the carbon foil.
2. The preparation method of the negative electrode material without the current collector of the lithium ion battery, according to claim 1, is characterized in that: in step 4, the drying conditions of the vacuum furnace are controlled as follows: pressure 0.2-0.4 MP; temperature 110-.
CN202011252366.XA 2020-11-11 2020-11-11 Preparation method of negative electrode material without current collector of lithium ion battery Pending CN112271295A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114933334A (en) * 2022-06-02 2022-08-23 深圳职业技术学院 Lithium ion battery PANI/Fe 2 O 3 Preparation method of composite negative electrode material

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102074683A (en) * 2010-12-10 2011-05-25 江南大学 Porous carbon nanofiber anode material for lithium ion battery and preparation method thereof
CN109256562A (en) * 2018-09-06 2019-01-22 中国科学院福建物质结构研究所 Carbon nanometer tube negative pole material for potassium ion secondary cell

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102074683A (en) * 2010-12-10 2011-05-25 江南大学 Porous carbon nanofiber anode material for lithium ion battery and preparation method thereof
CN109256562A (en) * 2018-09-06 2019-01-22 中国科学院福建物质结构研究所 Carbon nanometer tube negative pole material for potassium ion secondary cell

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114933334A (en) * 2022-06-02 2022-08-23 深圳职业技术学院 Lithium ion battery PANI/Fe 2 O 3 Preparation method of composite negative electrode material

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Application publication date: 20210126