CN113178570A - LiMn with long cycle life2O4Lithium battery material - Google Patents

LiMn with long cycle life2O4Lithium battery material Download PDF

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CN113178570A
CN113178570A CN202110260622.8A CN202110260622A CN113178570A CN 113178570 A CN113178570 A CN 113178570A CN 202110260622 A CN202110260622 A CN 202110260622A CN 113178570 A CN113178570 A CN 113178570A
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lithium battery
graphene
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段伟
汤献平
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Shenzhen Sunbang Power Technology Co ltd
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Shenzhen Sunbang Power 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
    • 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
    • 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
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
    • 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
    • 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
    • H01M2004/028—Positive 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 Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention discloses a lithium battery material of LiMn2O4 with a long cycle life, which comprises 8-15 parts by weight of graphene, 140 parts by weight of stannous sulfide, 20-35 parts by weight of organic solvent, 3-7 parts by weight of dispersant, 0.8-1.2 parts by weight of binder and 1.5-4 parts by weight of defoamer, organic solvent, dispersant, binder, defoamer, emulsifier, methyl cellulose and nickel powder; according to the invention, the graphene is well dispersed by the organic solvent and the dispersing agent, and the components such as stannous sulfide are mixed with the graphene, so that the compatibility between the graphene and each component is better, the lithium battery prepared by the invention has the advantages of larger capacitance, better conductivity and longer service life, the capacity retention rate reaches more than 80% after 100 cycles, and the stability is better.

Description

LiMn with long cycle life2O4Lithium battery material
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium battery material with a long cycle life and LiMn2O 4.
Background
"lithium battery" is a type of battery using a nonaqueous electrolyte solution with lithium metal or a lithium alloy as a positive/negative electrode material; because the chemical characteristics of lithium metal are very active, the requirements on the environment for processing, storing and using the lithium metal are very high. With the development of science and technology, lithium batteries have become the mainstream; lithium batteries can be broadly classified into two types: lithium metal batteries and lithium ion batteries; lithium metal batteries are generally batteries using manganese dioxide as a positive electrode material, metal lithium or an alloy metal thereof as a negative electrode material, and a nonaqueous electrolyte solution; the lithium ion battery generally uses lithium alloy metal oxide as a positive electrode material, graphite as a negative electrode material, and a non-aqueous electrolyte; lithium ion batteries do not contain lithium in the metallic state and are rechargeable; the fifth generation lithium metal battery of rechargeable batteries was born in 1996, and the safety, specific capacity, self-discharge rate and cost performance ratio of the rechargeable batteries are all superior to those of lithium ion batteries; due to its own high technical requirement limits, only a few countries of companies are producing such lithium metal batteries.
The existing high-purity lithium manganate is an important positive material of a lithium battery, wherein a negative material of the battery is one of important factors for improving the energy and the cycle life of the lithium ion battery; the traditional carbon-based material has the problems of low specific capacity, such as: the theoretical specific capacity of the graphite negative electrode material is 372mAh/g, and the increasing demand on the high-energy density lithium ion battery is difficult to meet, so that a lithium battery material of LiMn2O4 with a long cycle life is needed.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the existing defects, and provide a lithium battery material of LiMn2O4 with a long cycle life, so as to solve the problem that the energy and cycle life of the lithium battery are influenced due to the lower specific capacity of the traditional carbon-based material along with the increasing demand for the high-energy-density lithium ion battery in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: the lithium battery material with the high cycle life of LiMn2O4 comprises 8-15 parts by weight of graphene, 140 parts by weight of stannous sulfide, 20-35 parts by weight of organic solvent, 3-7 parts by weight of dispersing agent, 0.8-1.2 parts by weight of binding agent, 1.5-4 parts by weight of defoaming agent, 2-5 parts by weight of emulsifying agent, 15-20 parts by weight of methylcellulose and 30-45 parts by weight of nickel powder.
Preferably, the organic solvent comprises one or more of styrene, ethylene glycol ether and triethanolamine.
Preferably, the dispersant comprises one or more of ethylenediamine tetramethylene phosphate EDTMPA, hydroxyethylidene diphosphate HEDP, aminotrimethylene phosphate, cellulose derivatives and polyacrylamide.
Preferably, the binder comprises one or more of epoxy resin, unsaturated polyester resin, phenolic resin, polyacrylic resin and polyvinyl chloride resin.
Preferably, the defoamer comprises one or more of silicon and ether grafts, imines and amides.
Preferably, the emulsifier comprises one or more of stearic acid sodium salt, dodecyl sulfate sodium salt, dodecyl benzene sulfonic acid calcium salt, polyoxyethylene ether and polyoxypropylene ether.
Preferably, the nickel powder is nickel sulfate.
Preferably, the method comprises the steps of preparation step 1, step 2, step 3 and step 4;
the step 1 comprises the following steps: uniformly mixing 8-15 parts of graphene, 100-140 parts of stannous sulfide, 1.5-4 parts of defoaming agent and 3-7 parts of dispersing agent by using an ultrasonic stirrer, then mixing 20-35 parts of organic solvent, and mixing and stirring for 35-50min by using an ultrasonic stirring device at the frequency of 45-70KHZ to obtain a dispersion liquid A of the graphene and the stannous sulfide;
the step 2 comprises the following steps: adding 15-20 parts of methylcellulose into a proper amount of deionized water, then adding 30-45 parts of nickel powder at 80-90 ℃, and stirring in a stirrer N for 20-30min at a heat preservation time to obtain a fiber dispersion liquid B.
Preferably, the step 3 comprises: adding the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B into a stirring device M, mixing and stirring at the speed of 200-300r/min for 50-60min, then mixing 2-5 parts of emulsifier and 1.5-4 parts of defoaming agent, and then adding into the stirring device M, and mixing for 20-30min to obtain a mixed emulsion C of the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B;
the step 4 comprises the following steps: adding 0.8-1.2 parts of binder into a stirring device M, mixing with the mixed emulsion C through the stirring device M at the speed of 200-300r/min, and carrying out uniform speed reduction stirring for 5-10min by the stirring device M to finally obtain an electrode material bonding body D, and finally carrying out vacuum drying on the electrode material bonding body D to obtain the lithium battery material.
Preferably, the pressure condition of the vacuum drying in the step 4 is-0.05 MPa to-0.07 MPa, and the temperature condition is 75-90 ℃.
Compared with the prior art, the invention provides a lithium battery material of LiMn2O4 with long cycle life, which has the following beneficial effects:
according to the invention, the graphene is well dispersed by the organic solvent and the dispersing agent, and the components such as stannous sulfide are mixed with the graphene, so that the compatibility between the graphene and each component is better, the lithium battery prepared by the invention has the advantages of larger capacitance, better conductivity and longer service life, the capacity retention rate reaches more than 80% after 100 cycles, and the stability is better.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The invention provides a technical scheme that: the lithium battery material with the high cycle life of LiMn2O4 comprises graphene, stannous sulfide, styrene, diamine tetra methylene phosphate EDTMPA, epoxy resin, silicon and ether graft, sodium stearate salt, methyl cellulose and nickel powder, wherein the graphene comprises 8 parts by weight, the stannous sulfide comprises 100 parts by weight, the styrene comprises 20 parts by weight, the diamine tetra methylene phosphate EDTMPA comprises 3 parts by weight, the epoxy resin comprises 0.8 part by weight, the silicon and ether graft comprises 1.5 parts by weight, the sodium stearate salt comprises 2 parts by weight, the methyl cellulose comprises 15 parts by weight, and the nickel powder comprises 30 parts by weight.
In the present invention, it is preferable that the method comprises preparation step 1, step 2, step 3 and step 4;
the step 1 comprises the following steps: uniformly mixing 8 parts of graphene, 100 parts of stannous sulfide, 1.5 parts of silicon and ether graft and 3 parts of ethylene diamine tetramethylene phosphate (EDTMPA) by using an ultrasonic stirrer, mixing 20 parts of styrene, and mixing and stirring for 35-50min at the frequency of 45-70KHZ by using an ultrasonic stirring device to obtain a dispersion A of the graphene and the stannous sulfide;
the step 2 comprises the following steps: adding 15 parts of methylcellulose into a proper amount of deionized water, then adding 30 parts of nickel powder at the temperature of 80-90 ℃, and stirring in a stirrer N for 20-30min at a heat preservation time to obtain a fiber dispersion liquid B.
In the present invention, preferably, step 3 includes: adding the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B into a stirring device M, mixing and stirring at the speed of 200-300r/min for 50-60min, then taking 2 parts of sodium stearate, 1.5 parts of silicon and ether for grafting and mixing, and then adding into the stirring device M for 20-30min to obtain a mixed emulsion C of the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B;
step 4 comprises the following steps: and adding 0.8 part of epoxy resin into a stirring device M, mixing the epoxy resin and the mixed emulsion C together by the stirring device M at the speed of 200-300r/min, carrying out uniform speed reduction stirring for 5-10min by the stirring device M to finally obtain an electrode material bonding body D, and finally carrying out vacuum drying on the electrode material bonding body D to obtain the lithium battery material.
In the present invention, it is preferable that the vacuum drying in step 4 is performed under a pressure condition of-0.05 MPa to-0.07 MPa and a temperature condition of 75-90 ℃.
Example two
The invention provides a technical scheme that: a lithium battery material with long cycle life and LiMn2O4 comprises graphene, stannous sulfide, ethylene glycol ether, HEDP, unsaturated polyester resin, imine and amide, sodium dodecyl sulfate, methyl cellulose and nickel powder, wherein the weight component of the graphene is 8 parts, the weight component of the stannous sulfide is 100 parts, the weight component of the ethylene glycol ether is 20 parts, the weight component of the HEDP is 3 parts, the weight component of the unsaturated polyester resin is 0.8 part, the weight component of the imine and the amide is 1.5 parts, the weight component of the sodium dodecyl sulfate is 2 parts, the weight component of the methyl cellulose is 15 parts, and the weight component of the nickel powder is 30 parts.
In the present invention, it is preferable that the method comprises preparation step 1, step 2, step 3 and step 4;
the step 1 comprises the following steps: uniformly mixing 8 parts of graphene, 100 parts of stannous sulfide, 1.5 parts of imine and amide and 3 parts of HEDP through an ultrasonic stirrer, then mixing 20 parts of ethylene glycol ether, and mixing and stirring for 35-50min at the frequency of 45-70KHZ through an ultrasonic stirring device to obtain a dispersion A of the graphene and the stannous sulfide;
the step 2 comprises the following steps: adding 15 parts of methylcellulose into a proper amount of deionized water, then adding 30 parts of nickel powder at the temperature of 80-90 ℃, and stirring in a stirrer N for 20-30min at a heat preservation time to obtain a fiber dispersion liquid B.
In the present invention, preferably, step 3 includes: adding the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B into a stirring device M, mixing and stirring at the speed of 200-300r/min for 50-60min, mixing 2-5 parts of sodium dodecyl sulfate with 1.5 parts of imine and amide, and adding into the stirring device M for 20-30min to obtain a mixed emulsion C of the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B;
step 4 comprises the following steps: adding 0.8-1.2 parts of unsaturated polyester resin into a stirring device M, mixing with the mixed emulsion C through the stirring device M at the speed of 200-300r/min, carrying out uniform speed reduction stirring for 5-10min by the stirring device M to finally obtain an electrode material bonding body D, and finally carrying out vacuum drying on the electrode material bonding body D to obtain the lithium battery material.
In the present invention, it is preferable that the vacuum drying in step 4 is performed under a pressure condition of-0.05 MPa to-0.07 MPa and a temperature condition of 75-90 ℃.
Comparative example 1
The invention provides a technical scheme that: the lithium battery material with the high cycle life of LiMn2O4 comprises graphene, stannous sulfide, styrene, diamine tetra methylene phosphate EDTMPA, epoxy resin, silicon and ether graft, sodium stearate salt, methyl cellulose and nickel powder, wherein the graphene comprises 15 parts by weight, the stannous sulfide comprises 140 parts by weight, the styrene comprises 35 parts by weight, the diamine tetra methylene phosphate EDTMPA comprises 7 parts by weight, the epoxy resin comprises 1.2 parts by weight, the silicon and ether graft comprises 4 parts by weight, the sodium stearate salt comprises 5 parts by weight, the methyl cellulose comprises 20 parts by weight, and the nickel powder comprises 45 parts by weight.
In the present invention, it is preferable that the method comprises preparation step 1, step 2, step 3 and step 4;
the step 1 comprises the following steps: uniformly mixing 15 parts of graphene, 140 parts of stannous sulfide, 4 parts of silicon and ether graft and 7 parts of ethylene diamine tetramethylene phosphate (EDTMPA) by using an ultrasonic stirrer, mixing 20 parts of styrene, and mixing and stirring for 35-50min at the frequency of 45-70KHZ by using an ultrasonic stirring device to obtain a dispersion A of the graphene and the stannous sulfide;
the step 2 comprises the following steps: adding 20 parts of methylcellulose into a proper amount of deionized water, then adding 45 parts of nickel powder at the temperature of 80-90 ℃, and stirring in a stirrer N for 20-30min at a heat preservation time to obtain a fiber dispersion liquid B.
In the present invention, preferably, step 3 includes: adding the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B into a stirring device M, mixing and stirring at the speed of 200-300r/min for 50-60min, then taking 5 parts of sodium stearate and 4 parts of silicon and ether for grafting and mixing, and then adding into the stirring device M, and mixing for 20-30min to obtain a mixed emulsion C of the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B;
step 4 comprises the following steps: adding 1.2 parts of epoxy resin into a stirring device M, mixing with the mixed emulsion C through the stirring device M at the speed of 200-300r/min, carrying out uniform speed reduction stirring for 5-10min by the stirring device M to finally obtain an electrode material bonding body D, and finally carrying out vacuum drying on the electrode material bonding body D to obtain the lithium battery material.
In the present invention, it is preferable that the vacuum drying in step 4 is performed under a pressure condition of-0.05 MPa to-0.07 MPa and a temperature condition of 75-90 ℃.
Comparative example 2
The invention provides a technical scheme that: a lithium battery material with long cycle life and LiMn2O4 comprises graphene, stannous sulfide, ethylene glycol ether, HEDP, unsaturated polyester resin, imine and amide, sodium dodecyl sulfate, methyl cellulose and nickel powder, wherein the weight component of the graphene is 15 parts, the weight component of the stannous sulfide is 140 parts, the weight component of the ethylene glycol ether is 35 parts, the weight component of the HEDP is 7 parts, the weight component of the unsaturated polyester resin is 1.2 parts, the weight component of the imine and the amide is 4 parts, the weight component of the sodium dodecyl sulfate is 5 parts, the weight component of the methyl cellulose is 20 parts, and the weight component of the nickel powder is 45 parts.
In the present invention, it is preferable that the method comprises preparation step 1, step 2, step 3 and step 4;
the step 1 comprises the following steps: uniformly mixing 15 parts of graphene, 140 parts of stannous sulfide, 4 parts of imine and amide and 7 parts of HEDP through an ultrasonic stirrer, mixing 35 parts of ethylene glycol ether, and mixing and stirring for 35-50min at the frequency of 45-70KHZ through an ultrasonic stirring device to obtain a dispersion A of the graphene and the stannous sulfide;
the step 2 comprises the following steps: adding 20 parts of methylcellulose into a proper amount of deionized water, then adding 45 parts of nickel powder at the temperature of 80-90 ℃, and stirring in a stirrer N for 20-30min at a heat preservation time to obtain a fiber dispersion liquid B.
In the present invention, preferably, step 3 includes: adding the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B into a stirring device M, mixing and stirring at the speed of 200-300r/min for 50-60min, mixing 5 parts of sodium dodecyl sulfate with 4 parts of imine and amide, and adding into the stirring device M for 20-30min to obtain a mixed emulsion C of the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B;
step 4 comprises the following steps: adding 1.2 parts of unsaturated polyester resin into a stirring device M, mixing the unsaturated polyester resin and the mixed emulsion C together by the stirring device M at the speed of 200-300r/min, carrying out uniform speed reduction stirring for 5-10min by the stirring device M to finally obtain an electrode material bonding body D, and finally carrying out vacuum drying on the electrode material bonding body D to obtain the lithium battery material.
In the present invention, it is preferable that the vacuum drying in step 4 is performed under a pressure condition of-0.05 MPa to-0.07 MPa and a temperature condition of 75-90 ℃.
EXAMPLE III
The invention provides a technical scheme that: the lithium battery material with the high cycle life of LiMn2O4 comprises 10 parts by weight of graphene, 125 parts by weight of stannous sulfide, 30 parts by weight of organic solvent, 4 parts by weight of dispersing agent, 1 part by weight of binder, 2.5 parts by weight of defoaming agent, 3 parts by weight of emulsifying agent, 17 parts by weight of methyl cellulose and 35 parts by weight of nickel powder.
In the present invention, preferably, the organic solvent comprises one or more of styrene, ethylene glycol ether and triethanolamine.
In the present invention, preferably, the dispersant comprises one or more of ethylenediamine tetramethylene phosphate EDTMPA, hydroxyethylidene diphosphate HEDP, aminotrimethylene phosphate, cellulose derivatives and polyacrylamide.
In the present invention, preferably, the binder comprises one or more of epoxy resin, unsaturated polyester resin, phenolic resin, polyacrylic resin and polyvinyl chloride resin.
In the present invention, it is preferred that the defoaming agent comprises one or more of a combination of silicon and ether graft, imine and amide.
In the present invention, it is preferable that the emulsifier includes one or more of a combination of a sodium stearate salt, a sodium lauryl sulfate salt, a calcium dodecylbenzene sulfonate salt, a polyoxyethylene ether and a polyoxypropylene ether.
In the present invention, the nickel powder is preferably nickel sulfate.
In the present invention, it is preferable that the method comprises preparation step 1, step 2, step 3 and step 4;
the step 1 comprises the following steps: uniformly mixing 10 parts of graphene, 125 parts of stannous sulfide, 2.5 parts of defoaming agent and 4 parts of dispersing agent by using an ultrasonic stirrer, mixing 20-35 parts of organic solvent, and mixing and stirring for 35-50min at the frequency of 45-70KHZ by using an ultrasonic stirring device to obtain a dispersion liquid A of graphene and stannous sulfide;
the step 2 comprises the following steps: adding 17 parts of methylcellulose into a proper amount of deionized water, then adding 35 parts of nickel powder at the temperature of 80-90 ℃, and stirring in a stirrer N for 20-30min at a heat preservation time to obtain a fiber dispersion liquid B.
In the present invention, preferably, step 3 includes: adding the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B into a stirring device M, mixing and stirring at the speed of 200 plus materials and 300r/min for 50-60min, then mixing 3 parts of emulsifier and 2.5 parts of defoaming agent, and then adding into the stirring device M, and mixing for 20-30min to obtain a mixed emulsion C of the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B;
step 4 comprises the following steps: adding 1 part of the binder into a stirring device M, mixing with the mixed emulsion C through the stirring device M at the speed of 200-300r/min, carrying out uniform speed reduction stirring for 5-10min by the stirring device M to finally obtain an electrode material bonded body D, and finally carrying out vacuum drying on the electrode material bonded body D to obtain the lithium battery material.
In the present invention, it is preferable that the vacuum drying in step 4 is performed under a pressure condition of-0.05 MPa to-0.07 MPa and a temperature condition of 75-90 ℃.
The lithium battery materials prepared in the first embodiment, the second embodiment, the first comparative embodiment, the second comparative embodiment and the third embodiment are prepared into a soft package lithium ion battery according to a conventional method, and 100 times of cycle performance tests are carried out, wherein the test results are as follows:
Figure BDA0002969817890000091
Figure BDA0002969817890000101
performance test results of lithium battery materials
The test result shows that the specific capacity of the lithium battery prepared by the invention reaches more than 680mAh/g, the capacity retention rate reaches more than 80% after 100 cycles, the battery has large capacitance, good stability and long service life.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A high cycle life lithium battery material of LiMn2O4 comprises graphene, stannous sulfide, organic solvent, dispersant, binder, defoamer, emulsifier, methyl cellulose and nickel powder, and is characterized in that: the weight components of the graphene are 8-15 parts, the weight components of the stannous sulfide are 140 parts, the weight components of the organic solvent are 20-35 parts, the weight components of the dispersing agent are 3-7 parts, the weight components of the binder are 0.8-1.2 parts, the weight components of the defoaming agent are 1.5-4 parts, the weight components of the emulsifier are 2-5 parts, the weight components of the methyl cellulose are 15-20 parts, and the weight components of the nickel powder are 30-45 parts.
2. A high cycle life LiMn2O4 lithium battery material as claimed in claim 1, wherein: the organic solvent comprises one or more of styrene, ethylene glycol ether and triethanolamine.
3. A high cycle life LiMn2O4 lithium battery material as claimed in claim 1, wherein: the dispersing agent comprises one or more of ethylenediamine tetramethylene phosphate EDTMPA, hydroxyethylidene diphosphate HEDP, amino trimethylene phosphate, cellulose derivatives and polyacrylamide.
4. A high cycle life LiMn2O4 lithium battery material as claimed in claim 1, wherein: the binder comprises one or more of epoxy resin, unsaturated polyester resin, phenolic resin, polyacrylic resin and polyvinyl chloride resin.
5. A high cycle life LiMn2O4 lithium battery material as claimed in claim 1, wherein: the defoamer comprises one or more of silicon and ether graft, imine and amide.
6. A high cycle life LiMn2O4 lithium battery material as claimed in claim 1, wherein: the emulsifier comprises one or more of stearic acid sodium salt, dodecyl sodium sulfate salt, dodecyl benzene sulfonic acid calcium salt, polyoxyethylene ether and polyoxypropylene ether.
7. A high cycle life LiMn2O4 lithium battery material as claimed in claim 1, wherein: the nickel powder is nickel sulfate.
8. A high cycle life LiMn2O4 lithium battery material as claimed in claim 1, wherein: comprises a preparation step 1, a step 2, a step 3 and a step 4;
the step 1 comprises the following steps: uniformly mixing 8-15 parts of graphene, 100-140 parts of stannous sulfide, 1.5-4 parts of defoaming agent and 3-7 parts of dispersing agent by using an ultrasonic stirrer, then mixing 20-35 parts of organic solvent, and mixing and stirring for 35-50min by using an ultrasonic stirring device at the frequency of 45-70KHZ to obtain a dispersion liquid A of the graphene and the stannous sulfide;
the step 2 comprises the following steps: adding 15-20 parts of methylcellulose into a proper amount of deionized water, then adding 30-45 parts of nickel powder at 80-90 ℃, and stirring in a stirrer N for 20-30min at a heat preservation time to obtain a fiber dispersion liquid B.
9. A high cycle life LiMn2O4 lithium battery material as claimed in claim 8, wherein: the step 3 comprises the following steps: adding the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B into a stirring device M, mixing and stirring at the speed of 200-300r/min for 50-60min, then mixing 2-5 parts of emulsifier and 1.5-4 parts of defoaming agent, and then adding into the stirring device M, and mixing for 20-30min to obtain a mixed emulsion C of the dispersion liquid A of graphene and stannous sulfide and the fiber dispersion liquid B;
the step 4 comprises the following steps: adding 0.8-1.2 parts of binder into a stirring device M, mixing with the mixed emulsion C through the stirring device M at the speed of 200-300r/min, and carrying out uniform speed reduction stirring for 5-10min by the stirring device M to finally obtain an electrode material bonding body D, and finally carrying out vacuum drying on the electrode material bonding body D to obtain the lithium battery material.
10. A high cycle life LiMn2O4 lithium battery material as claimed in claim 8, wherein: the pressure condition of vacuum drying in the step 4 is-0.05 MPa to-0.07 MPa, and the temperature condition is 75-90 ℃.
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CN107565107A (en) * 2017-07-31 2018-01-09 广西中润四方税银科技有限公司 A kind of graphene lithium battery material and preparation method thereof
CN107871870A (en) * 2017-10-30 2018-04-03 成都格莱飞科技股份有限公司 Graphene lithium battery electrocondution slurry
CN110534699A (en) * 2019-08-22 2019-12-03 李金娣 A kind of preparation method of anode plate for lithium ionic cell
CN111224101A (en) * 2018-11-26 2020-06-02 谢娟 High-stability conductive liquid for graphene lithium battery
CN111613790A (en) * 2020-06-10 2020-09-01 王凯 Efficient attenuation-resistant graphene power lithium battery material and preparation method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106450330A (en) * 2016-10-21 2017-02-22 成都新柯力化工科技有限公司 Heterogeneous graphene conductive agent special for lithium battery and preparation method thereof
CN107565107A (en) * 2017-07-31 2018-01-09 广西中润四方税银科技有限公司 A kind of graphene lithium battery material and preparation method thereof
CN107871870A (en) * 2017-10-30 2018-04-03 成都格莱飞科技股份有限公司 Graphene lithium battery electrocondution slurry
CN111224101A (en) * 2018-11-26 2020-06-02 谢娟 High-stability conductive liquid for graphene lithium battery
CN110534699A (en) * 2019-08-22 2019-12-03 李金娣 A kind of preparation method of anode plate for lithium ionic cell
CN111613790A (en) * 2020-06-10 2020-09-01 王凯 Efficient attenuation-resistant graphene power lithium battery material and preparation method thereof

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