CN105932228A - Preparation method for high-capacity lithium ion battery positive electrode tab - Google Patents

Preparation method for high-capacity lithium ion battery positive electrode tab Download PDF

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Publication number
CN105932228A
CN105932228A CN201610376129.1A CN201610376129A CN105932228A CN 105932228 A CN105932228 A CN 105932228A CN 201610376129 A CN201610376129 A CN 201610376129A CN 105932228 A CN105932228 A CN 105932228A
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positive electrode
organic solvent
lithium ion
capacity lithium
preparation
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陈端典
陈文明
黄昌荣
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QUANZHOU JINTION ELECTRONICS CO Ltd
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QUANZHOU JINTION ELECTRONICS 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
    • H01M4/04—Processes of manufacture in general
    • 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
    • H01M4/139—Processes of manufacture
    • H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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
    • H01M10/058—Construction or manufacture
    • 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
    • H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
    • 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

Abstract

The present invention provides a preparation method for a high-capacity lithium ion battery positive electrode tab. The method comprises: 1) adding a positive electrode material, a conductive agent and a binder into a planet stirrer, and stirring the mixture at high speed to obtain positive electrode powder; 2) weighing organic solvent, adding 40-60% of a total mass of the organic solvent into the positive electrode powder, stirring the mixture under vacuum at high speed to obtain positive electrode paste; 3) adding 20-30% of the total mass of the organic solvent into the positive electrode paste, controlling a stirring temperature at 25-33 DEG C, and stirring the mixture under vacuum at high speed for 60-100 min; 4) adding the remaining organic solvent into the positive electrode paste by several times to adjust viscosity, and sieving the mixture to obtain positive electrode slurry; and 5) coating positive and negative surfaces of a positive electrode metal current collector with the positive electrode slurry, and drying and rolling the surfaces, so as to obtain a high-capacity lithium ion battery positive electrode tab. By the method, which is provided by the present invention, of stirring the powder material in advance, then kneading the material and finally dispersing the material, material components with different densities can be mixed more uniformly, and higher efficiency is achieved.

Description

A kind of preparation method of high-capacity lithium ion cell positive plate
Technical field
The present invention relates to technical field of lithium-ion battery, one is smart mobile phone, super, flat board specifically The digital products such as computer provide the preparation method of the high-capacity lithium ion cell positive plate of the energy.
Background technology
Lithium ion battery has been the secondary cell of new generation since the nineties in last century, has that energy density is big, the circulation longevity The life advantage such as length, running voltage height, memory-less effect, little, the operating temperature range width of self discharge, mobile communication, removable computer, The every field such as electric automobile, Aero-Space, biomedical engineering are widely used, and are the critical products of new and high technology One of.In recent years, various electronic products gradually to miniaturization, intellectuality and multifunction develop, as smart mobile phone, super, Panel computers etc., the energy density of lithium ion battery is just had higher requirement by this.
Lithium ion battery is with cobalt acid lithium (LiCoO2), ternary material (LiNixCoyMnzO2), LiMn2O4 (LiMn2O4), phosphoric acid Ferrum lithium (LiFePO4) it is main positive electrode；Wherein cobalt acid lithium (LiCoO2) energy density the highest, a theoretical gram specific capacity can Reaching 270mAh/g, but cobalt acid lithium gram specific capacity can only be accomplished between 140 mAh/g～150mAh/g at present, ceiling voltage is also only Can be charged to 4.2V, and the cumbersome complexity of stirring technique, gluing to be carried out when making battery, carry out conductive agent more abundant Dispersion, finally adds main material high-speed stirred and just can complete the making of slurry after tens hours.
Summary of the invention
The present invention provides the preparation method of a kind of high-capacity lithium ion cell positive plate, and its main purpose is to overcome existing Lithium battery gram specific capacity can only accomplish that 140150mAh/g, charging voltage be the highest and the defect such as processing technology is loaded down with trivial details.
The present invention adopts the following technical scheme that
A kind of high-capacity lithium ion cell, including positive plate, negative plate and electrolyte, positive plate includes anode sizing agent and positive pole gold Belonging to collector, anode sizing agent is made up of following substances in percentage by weight: positive electrode 95～98%, conductive agent 1～5%, bonding Agent 1～4%, wherein, positive electrode uses surface through Co (OH)2The LiCoO being coated with2, the particle size distribution of this positive electrode is D10:3～7um, D50:9～18um, D90:16～30um.
At least two mixing in acetylene black, VGCF, SP, scale graphite of the conductive agent of anode sizing agent, binding agent selects From the molecular weight Kynoar more than more than 1,000,000, metal collector is selected from the aluminium foil that thickness is 10～18um.
Negative plate includes: cathode size and negative metal collector, cathode size is by following substances in percentage by weight system Becoming: negative material 90～97%, conductive agent 0～4%, binding agent 2～8%, wherein, negative material uses with silicon powder particle as matrix, The silicon-carbon alloy composite of Surface coating CNT.
The conductive agent of cathode size one in acetylene black, VGCF, SP, scale graphite, the stupid rubber of fourth selected by binding agent Glue (SBR) and the mixture of sodium carboxymethyl cellulose (CMC), metal collector is selected from the Copper Foil that thickness is 5～9um.
Electrolyte contains the lithium hexafluoro phosphate of 1 mol/L to the selection of above-mentioned electrolyte, mass ratio is ethylene carbonate (EC): Dimethyl carbonate (DMC): three kinds of mixed liquors of Ethyl methyl carbonate (EMC)=1:1:1 and content 0.5～the cyclohexyl benzene of 6% (CHB)。
The manufacturing process of above-mentioned high-capacity lithium ion cell, comprises the following steps: (1) uses dry method high-speed stirred just preparing Pole piece；(2) dry method high-speed stirred is used to prepare negative plate；(3) it is wound by negative plate, barrier film, the mode of positive plate, uses aluminum Mould composite membrane and encapsulate to obtain battery core；(4) by after battery core vacuum bakeout, electrolyte, sealing are injected；(5) grading current chemical conversion side is used The battery core of step (4) is melted into by method.
Wherein, the preparation of above-mentioned positive plate comprises the steps:
1), positive electrode, conductive agent and binding agent are joined in planetary mixer, high-speed stirred 60～120min, obtain positive pole Powder body；
2), by solid-liquid mass ratio positive powder: organic solvent=3:1 weighs organic solvent, the 40 of organic solvent gross mass～60% add Entering in positive pole powder, vacuum high-speed stirred 100～180min, whipping temp controls, at 30～60 DEG C, to obtain positive electrode paste；
3), adding the 20～30% of organic solvent gross mass in positive electrode paste, whipping temp controls at 25～35 DEG C, and vacuum is high Speed stirring 60～100min；
4), by remaining organic solvent join regulation viscosity in positive electrode paste by several times, sieve and obtain anode sizing agent；
5), the anode sizing agent sieved is coated on the tow sides of cathode metal collector, dries, roll-in, obtain high-capacity lithium ion battery from Sub-battery anode slice.
The compacted density of above-mentioned positive plate is 4.0～4.3g/cm3。
The preparation of above-mentioned negative plate comprises the steps:
1), negative material, conductive agent and CMC are joined in planetary mixer, high-speed stirred 60～120min, obtain negative electrode powder Body；
2), deionized water is weighed by solid-to-liquid ratio negative pole powder body: deionized water=1:1～1.2, and by the 40 of deionized water gross mass ～60% join in the negative pole powder body of step 1), vacuum high-speed stirred 100～180min, whipping temp controls 30～50 DEG C, Negative pole mastic；
3), joining in negative pole mastic by the 20～30% of deionized water gross mass, whipping temp controls at 25～35 DEG C, vacuum High-speed stirred 60～100min；
4), joining in step 3) by SBR, whipping temp controls at 25～35 DEG C, vacuum high-speed stirred 30～100min；
5), remaining deionized water is joined in step 4) by several times, regulate viscosity, sieve and obtain cathode size；
6), the cathode size sieved is coated on the tow sides of negative metal collector, dries, roll-in, obtain high-capacity lithium ion battery from Sub-battery cathode sheet.
The compacted density of above-mentioned negative plate is 1.5～2.0g/cm3。
The PE micro-pore septum that above-mentioned barrier film selects thickness to be 12～16um.
Above-mentioned grading current chemical synthesizing method comprises the steps:
1) 0.2mA/cm is used2Electric current charge to 2.0V, or 30～60min cut-offs；
2) 0.5mA/cm is used2Electric current charge to 2.5V, or 120～180min cut-offs；
3) 1mA/cm is used again2Electric current charge to 3.1V, or 120～180min cut-offs；
4) 3mA/cm is finally used2Electric current charge to 4.4V, constant-voltage charge cut-off current is 1mA/cm2Or 60min cut-off.
From the above-mentioned description of this invention, it is an advantage of the current invention that:
1, the lithium ion battery of the present invention, has high, the superior processing characteristics of energy density and high voltage cycle performance.
2, the present invention is by first with material particle size distribution width, making to pile up closely between material particles, make battery pole piece Compacted density is big.
3, the present invention is by stirring powder body material in advance, then mediates, last scattered method, can make different densities material Material component mixes evenly, in hgher efficiency.
4, grading current chemical synthesizing method of the present invention makes pole piece form Stability Analysis of Structures, fine and close SEI film.
5, present invention process is simple, easy to control and operates, good stability, easily realizes industrial-scale production.
Accompanying drawing explanation
Fig. 1 is the charging and discharging curve figure of the embodiment of the present invention 1 lithium battery 4.4～3.0V；
Fig. 2 is the cycle performance curve chart of the embodiment of the present invention 1 lithium battery 4.4V～3.0V.
Detailed description of the invention
Embodiment 1
1, carry out anode sizing agent according to the following steps to prepare
Weigh following solid material by mass fraction ratio: 94.5% cobalt acid lithium, 2%SP, 1%VGCF, 2.5%Solef5130, then weigh Mass fraction is the organic solvent NMP of the 1/3 of above each solid material quality summation；And each solid material is put into 120 DEG C Being dried 4 hours in vacuum drying oven, vacuum is-0.1 MPa；Again cobalt acid lithium, SP, VGCF and Solef5130 are joined planet and stir Mix in machine agitator tank, high-speed stirred 60min；It is subsequently added into the organic solvent NMP of 60%, vacuum high-speed stirred 120min, stirring temperature Degree is 45 degree；Adding 30% organic solvent NMP, vacuum high-speed stirred 60min, whipping temp is 30 degree；Finally will remain 10% Organic solvent NMP, carries out slurry viscosity regulation, and range of viscosities is 5000～8000 lis of handkerchiefs.
2, carry out cathode size according to the following steps to prepare
Weigh following solid material by mass fraction ratio: 94.5% silicon-carbon alloy material, 1%SP, 1.5%CMC, 2.5%SBR, then press Solid-to-liquid ratio is that 1:1.05 weighs distilled water；Silicon-carbon alloy material, SP, CMC, SBR are added in star row blender, high-speed stirred 50min；Being subsequently added into the deionized water of 60%, vacuum high-speed stirred 120min, whipping temp is 45 DEG C；Add 30% deionization Water, vacuum high-speed stirred 60min, whipping temp is 30 DEG C, is eventually adding SBR, vacuum high-speed stirred 60min, and whipping temp is 30 DEG C, will remain 10% deionized water, and carry out slurry viscosity regulation, range of viscosities is 2000～5000 lis of handkerchiefs.
3, film-making packaging
The positive and negative electrode slurry that will prepare, uses transfer type coating machine to be coated in respectively on the tow sides of aluminium foil and Copper Foil, through drying Carrying out roll-in after Gan, compacted density is respectively as follows: positive pole 4.2 g/cm3, negative pole 1.7 g/cm3。
The pole piece above-mentioned each example manufactured, is cut into by thickness 4.5mm, width 34mm, the battery process requirement of length 50mm Required length and width, is then wound by negative plate, barrier film, the mode of positive plate, encapsulates with aluminum-plastic composite membrane, stays one Limit opening, obtains battery core.
4, baking fluid injection
By battery core after 85 degree of vacuum bakeouts, injecting containing the lithium hexafluoro phosphate of 1 mol/L, mass ratio is ethylene carbonate (EC): dimethyl carbonate (DMC): three kinds of mixture of Ethyl methyl carbonate (EMC)=1:1:1 and the cyclohexyl benzene (CHB) of content 2% Electrolyte, sealing.Wherein, the ratio of lithium hexafluoro phosphate, three kinds of mixed liquors and cyclohexyl benzene be arbitrarily than.
5, it is melted in the following manner:
1) 0.2mA/cm is used2Electric current charge to 2.0V, or 30～60min cut-offs；
2) 0.5mA/cm is used2Electric current charge to 2.5V, or 120～180min cut-offs；
3) 1mA/cm is used again2Electric current charge to 3.1V, or 120～180min cut-offs；
4) 3mA/cm is finally used2Electric current charge to 4.4V, constant-voltage charge cut-off current is 1mA/cm2Or 60min cut-off.
After being melted into, battery carries out vacuum suction sealing.
The charging and discharging curve of embodiment of the present invention lithium battery 4.4～3.0V, with reference to Fig. 1, in FIG, abscissa is a gram ratio Capacity (mAh/g), vertical coordinate be voltage (mV), curve a be discharge curve, b is charging curve.
The cycle performance curve of embodiment of the present invention lithium battery 4.4V～3.0V, with reference to Fig. 2, in fig. 2, abscissa is for following In ring week number (all), vertical coordinate is percent of discharge (%).
Embodiment 2
The present embodiment prepares the step of assembled battery and operation is same as in Example 1, and except for the difference that positive pole is in mass ratio: 95% Cobalt acid lithium, 2%SP, 1%VGCF, 2%Solef5130, negative pole is in mass ratio: 95% silicon-carbon alloy material, 1%SP, 1.3%CMC, 2.2%SBR, electrolysis additive cyclohexyl benzene (CHB) dosage is 3%.
Following table is the compacted density of embodiment 1 and embodiment 2 LITHIUM BATTERY sheet.
Above are only the detailed description of the invention of the present invention, but the design concept of the present invention is not limited thereto, all utilize this Design carries out the change of unsubstantiality to the present invention, all should belong to the behavior invading scope.

Claims (4)

1. the preparation method of a high-capacity lithium ion cell positive plate, it is characterised in that comprise the steps:
1), positive electrode, conductive agent and binding agent are joined in planetary mixer, high-speed stirred 60～120min, obtain positive pole Powder body；
2), by solid-liquid mass ratio positive powder: organic solvent=3:1 weighs organic solvent, the 40 of organic solvent gross mass～60% add Entering in positive pole powder, vacuum high-speed stirred 100～180min, whipping temp controls, at 30～60 DEG C, to obtain positive electrode paste；
3), adding the 20～30% of organic solvent gross mass in positive electrode paste, whipping temp controls at 25～35 DEG C, and vacuum is high Speed stirring 60～100min；
4), by remaining organic solvent join regulation viscosity in positive electrode paste by several times, sieve and obtain anode sizing agent；
5), the anode sizing agent sieved is coated on the tow sides of cathode metal collector, dries, roll-in, obtain high-capacity lithium ion battery from Sub-battery anode slice.
The preparation method of a kind of high-capacity lithium ion cell positive plate the most as claimed in claim 1, it is characterised in that: step 5) The compacted density of middle positive plate roll-in is 4.0～4.3g/cm3。
The preparation method of a kind of high-capacity lithium ion cell positive plate the most as claimed in claim 1, it is characterised in that: described just The slurry of pole piece is made up of following substances in percentage by weight: positive electrode 95～98%, conductive agent 1～5%, binding agent 1～4%, Wherein, positive electrode uses surface through Co (OH)2The LiCoO being coated with2, the particle size distribution of this positive electrode be D10:3～ 7um, D50:9～18um, D90:16～30um.
The preparation method of a kind of high-capacity lithium ion cell positive plate the most as claimed in claim 3, it is characterised in that lead described in: Electricity agent at least two mixing in acetylene black, VGCF, SP, the scale graphite, binding agent selected from molecular weight more than 1,000,000 with On Kynoar, metal collector selected from thickness be 10～18um aluminium foil.
CN201610376129.1A 2014-01-28 2014-01-28 Preparation method for high-capacity lithium ion battery positive electrode tab Pending CN105932228A (en)

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