CN105406049A - High-efficiency sulfur/charcoal-coated lithium cobalt oxide positive electrode material and preparation method thereof - Google Patents

High-efficiency sulfur/charcoal-coated lithium cobalt oxide positive electrode material and preparation method thereof Download PDF

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Publication number
CN105406049A
CN105406049A CN201511027475.0A CN201511027475A CN105406049A CN 105406049 A CN105406049 A CN 105406049A CN 201511027475 A CN201511027475 A CN 201511027475A CN 105406049 A CN105406049 A CN 105406049A
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charcoal
lithium
sulphur
coated
cobalt oxide
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CN201511027475.0A
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王晓伟
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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
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • 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
    • H01M4/36—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
    • 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
    • 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)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention relates to a high-efficiency sulfur/charcoal-coated lithium cobalt oxide positive electrode material and a preparation method thereof. The high-efficiency sulfur/charcoal-coated lithium cobalt oxide positive electrode material is prepared from the following components by weight: 50 parts of a sulfur/charcoal composite material, 65 parts of lithium cobalt oxide, 20 parts of a lithium ferric nitrate solution with a concentration of 45%, 13 parts of flake graphite and 13 parts of a bonding material. The high-efficiency sulfur/charcoal-coated lithium cobalt oxide positive electrode material overcomes the defect of failure caused by self-discharging of a protection plate of a lithium ion battery, so self-discharging of a whole battery pack is improved, the purpose of prolongation of the storage time of the lithium battery is achieved, and it is guaranteed that the lithium battery can be stored for a long time under the condition that a user does not charge an electric appliance after usage.

Description

Lithium cobaltate cathode material that a kind of efficient sulphur/charcoal is coated and preparation method thereof
Technical field
The present invention relates to coated lithium cobaltate cathode material of a kind of efficient sulphur/charcoal and preparation method thereof.
Background technology
Lithium ion battery is since commercialization, and lithium ion battery positive electrode used is mostly cobalt acid lithium, LiMn2O4 or ternary material etc., and its component mainly cobalt acid lithium adds conductive agent adding additives again, and described cobalt acid lithium is cobalt acid lithium, LiMn2O4 or ternary etc.; Negative material adopts graphite to be active material mostly, then adds some conductive agents and binding agent; Its advantage is that capacity is higher, has extended cycle life, but cobalt resource is deficient, expensive and have toxicity, therefore seeks excellent honest and clean, the important research direction that dependable performance, eco-friendly positive electrode become lithium ion battery of price.Be that spinel-type positive electrode and the ternary material layered oxide of representative is in the past decade extensively studied with LiMn2O4, but constrain their development prospect due to its defect existed separately.In addition, the system of positive and negative pole material composition has a common feature to discharge the later stage exactly, especially at the end of electric discharge, voltage drop quickly, namely inside this voltage range, the capacity of lithium ion battery almost without.
Summary of the invention
The technical problem to be solved in the present invention is the above-mentioned defect how overcoming prior art, lithium cobaltate cathode material providing a kind of efficient sulphur/charcoal coated and preparation method thereof.
For solving the problems of the technologies described above, this lithium cobaltate cathode material that efficiently sulphur/charcoal is coated by weight, be prepared from according to shown ratio by following component, ferric nitrate lithium solution 20, crystalline flake graphite 13, the binding material 13 of sulphur/carbon composite 50, cobalt acid lithium 65,45%.
This lithium cobaltate cathode material preparation method that efficiently sulphur/charcoal is coated comprises the following steps:
(1) according to above-mentioned weight ratio, material with carbon element and sublimed sulfur or Cosan are put into zirconium dioxide or agate jar, after ball grinder being injected high purity inert gas in glove box, be placed in ball milling 5h on planetary ball mill, rotational speed of ball-mill is 500r/min, and the mass ratio of elemental sulfur and carbon is 1:2 ~ 3: 2; Obtain sulphur/carbon composite, this sulphur/carbon composite is warming up to 150 DEG C with the rate of heat addition of 10 DEG C/min in an oven, and is incubated 24h at this temperature;
(2) be dispersed in by sulphur/carbon composite in the mixed solvent of the water that volume ratio is 3:1 and acetone, water or chloroform, ultrasonic or stirring, makes it disperse completely equably;
(3) by cobalt acid lithium, 45% ferric nitrate lithium solution, crystalline flake graphite, binding material add in mixed solution, again ultrasonic or stir, add or do not add dopant acid, whole mixed solution system is in acid, and its pH value is between 2 ~ 4;
(4) under ice-water bath and inert atmosphere protection, ammonium persulfate aqueous solution or FeCl is added 3chloroformic solution, stirring reaction 24h under constant temperature, then by product centrifugation, washing, the vacuum drying chamber putting into 60 DEG C is dried, and is ground to powder.
The coated lithium cobaltate cathode material preparation method method of a kind of efficient sulphur/charcoal of the present invention is simple; with low cost; overcome lithium ion battery causes inefficacy defect because of baffle self discharge; thus improve the self discharge of whole battery pack; realize the object extending the lithium battery resting period, when ensureing that user uses electrical appliance and do not charge, the longer time can be stored.
Embodiment
This lithium cobaltate cathode material that efficiently sulphur/charcoal is coated by weight, is prepared from according to shown ratio by following component, ferric nitrate lithium solution 20, crystalline flake graphite 13, the binding material 13 of sulphur/carbon composite 50, cobalt acid lithium 65,45%.The ferric nitrate lithium solution of described 45% is the ferric nitrate lithium solution of 60%.Described positive electrode is cobalt acid lithium.Described conductive agent is crystalline flake graphite.
This lithium cobaltate cathode material preparation method that efficiently sulphur/charcoal is coated comprises the following steps:
(1) according to above-mentioned weight ratio, material with carbon element and sublimed sulfur or Cosan are put into zirconium dioxide or agate jar, after ball grinder being injected high purity inert gas in glove box, be placed in ball milling 5h on planetary ball mill, rotational speed of ball-mill is 500r/min, and the mass ratio of elemental sulfur and carbon is 1:2 ~ 3: 2; Obtain sulphur/carbon composite, this sulphur/carbon composite is warming up to 150 DEG C with the rate of heat addition of 10 DEG C/min in an oven, and is incubated 24h at this temperature;
(2) be dispersed in by sulphur/carbon composite in the mixed solvent of the water that volume ratio is 3:1 and acetone, water or chloroform, ultrasonic or stirring, makes it disperse completely equably;
(3) by cobalt acid lithium, 45% ferric nitrate lithium solution, crystalline flake graphite, binding material add in mixed solution, again ultrasonic or stir, add or do not add dopant acid, whole mixed solution system is in acid, and its pH value is between 2 ~ 4;
(4) under ice-water bath and inert atmosphere protection, ammonium persulfate aqueous solution or FeCl is added 3chloroformic solution, stirring reaction 24h under constant temperature, then by product centrifugation, washing, the vacuum drying chamber putting into 60 DEG C is dried, and is ground to powder.
The present invention includes but be not limited to above-mentioned execution mode, any product meeting these claims and describe, all falls within protection scope of the present invention.

Claims (2)

1. the lithium cobaltate cathode material that efficient sulphur/charcoal is coated, it is characterized in that: by weight, the coated lithium cobaltate cathode material of this efficient sulphur/charcoal is prepared from according to shown ratio by following component, ferric nitrate lithium solution 20, crystalline flake graphite 13, the binding material 13 of sulphur/carbon composite 50, cobalt acid lithium 65,45%.
2. the lithium cobaltate cathode material preparation method that efficient sulphur/charcoal is coated, is characterized in that: the coated lithium cobaltate cathode material of described efficient sulphur/charcoal is the coated lithium cobaltate cathode material of efficient sulphur/charcoal according to claim 1, and its preparation method comprises the following steps:
(1) according to above-mentioned weight ratio, material with carbon element and sublimed sulfur or Cosan are put into zirconium dioxide or agate jar, after ball grinder being injected high purity inert gas in glove box, be placed in ball milling 25h on planetary ball mill, rotational speed of ball-mill is 2500r/min, and the mass ratio of elemental sulfur and carbon is 1:2 ~ 3: 2; Obtain sulphur/carbon composite, this sulphur/carbon composite is warming up to 155 DEG C with the rate of heat addition of 10 DEG C/min in an oven, and is incubated 24h at this temperature;
(2) be dispersed in by sulphur/carbon composite in the mixed solvent of the water that volume ratio is 3:1 and acetone, water or chloroform, ultrasonic or stirring, makes it disperse completely equably;
(3) by cobalt acid lithium, 45% ferric nitrate lithium solution, crystalline flake graphite, binding material add in mixed solution, again ultrasonic or stir, add or do not add dopant acid, whole mixed solution system is in acid, and its pH value is between 2 ~ 4;
(4) under ice-water bath and inert atmosphere protection, ammonium persulfate aqueous solution or FeCl is added 3chloroformic solution, stirring reaction 24h under constant temperature, then by product centrifugation, washing, the vacuum drying chamber putting into 60 DEG C is dried, and is ground to powder.
CN201511027475.0A 2015-12-30 2015-12-30 High-efficiency sulfur/charcoal-coated lithium cobalt oxide positive electrode material and preparation method thereof Pending CN105406049A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108281633A (en) * 2018-01-26 2018-07-13 南开大学 Lithium sulfur battery anode material, preparation method and lithium-sulfur cell

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108281633A (en) * 2018-01-26 2018-07-13 南开大学 Lithium sulfur battery anode material, preparation method and lithium-sulfur cell

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