CN105514386A - Modified sulfur/carbon coated lithium cobaltate cathode material and preparation method thereof - Google Patents

Modified sulfur/carbon coated lithium cobaltate cathode material and preparation method thereof Download PDF

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Publication number
CN105514386A
CN105514386A CN201511025418.9A CN201511025418A CN105514386A CN 105514386 A CN105514386 A CN 105514386A CN 201511025418 A CN201511025418 A CN 201511025418A CN 105514386 A CN105514386 A CN 105514386A
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lithium
cathode material
sulphur
lithium cobaltate
cobaltate cathode
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姜殿凯
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Individual
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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
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • 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
    • H01M4/36—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
    • 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)
  • Composite Materials (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention relates to a modified sulfur/carbon coated lithium cobaltate cathode material and a preparation method thereof. The modified sulfur/carbon coated lithium cobaltate cathode material is prepared from the following components in parts by weight: 40 parts of sulfur/carbon composite material, 50 parts of lithium cobaltate, 20 parts of 45% lithium iron nitrate solution, 5 parts of flake graphite and 5 parts of binding material. The modified sulfur/carbon coated lithium cobaltate cathode material has the effect of overcoming the defect of lithium ion battery failure caused by self-discharge of protection boards, thus improving self-discharge of a whole battery pack, achieving the aim of prolonging the lithium battery storage time and ensuring that lithium batteries can be stored for a longer time under the condition that users do not charge the lithium batteries after using electric appliances.

Description

Lithium cobaltate cathode material that a kind of modified sulphur/charcoal is coated and preparation method thereof
Technical field
The present invention relates to coated lithium cobaltate cathode material of a kind of modified 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 modified sulphur/charcoal coated and preparation method thereof.
For solving the problems of the technologies described above, the coated lithium cobaltate cathode material of this modified sulphur/charcoal by weight, be prepared from according to shown ratio by following component, ferric nitrate lithium solution 20, crystalline flake graphite 5, the binding material 5 of sulphur/carbon composite 40, cobalt acid lithium 50,45%.
Coated lithium cobaltate cathode material preparation method comprises the following steps this modified sulphur/charcoal:
(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 modified 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
The coated lithium cobaltate cathode material of this modified sulphur/charcoal by weight, is prepared from according to shown ratio by following component, ferric nitrate lithium solution 20, crystalline flake graphite 5, the binding material 5 of sulphur/carbon composite 40, cobalt acid lithium 50,45%.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
Coated lithium cobaltate cathode material preparation method comprises the following steps this modified sulphur/charcoal:
(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 modified sulphur/charcoal is coated, it is characterized in that: by weight, the coated lithium cobaltate cathode material of this modified sulphur/charcoal is prepared from according to shown ratio by following component, ferric nitrate lithium solution 20, crystalline flake graphite 5, the binding material 5 of sulphur/carbon composite 40, cobalt acid lithium 50,45%.
2. the lithium cobaltate cathode material preparation method that modified sulphur/charcoal is coated, is characterized in that: the coated lithium cobaltate cathode material of described modified sulphur/charcoal is the coated lithium cobaltate cathode material of modified 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 20h on planetary ball mill, rotational speed of ball-mill is 2000r/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.
CN201511025418.9A 2015-12-30 2015-12-30 Modified sulfur/carbon coated lithium cobaltate cathode material and preparation method thereof Pending CN105514386A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201511025418.9A CN105514386A (en) 2015-12-30 2015-12-30 Modified sulfur/carbon coated lithium cobaltate cathode material and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201511025418.9A CN105514386A (en) 2015-12-30 2015-12-30 Modified sulfur/carbon coated lithium cobaltate cathode material and preparation method thereof

Publications (1)

Publication Number Publication Date
CN105514386A true CN105514386A (en) 2016-04-20

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Country Status (1)

Country Link
CN (1) CN105514386A (en)

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