CN114709397A - Manganese-based lithium ion soft-package laminated battery and preparation method thereof - Google Patents

Manganese-based lithium ion soft-package laminated battery and preparation method thereof Download PDF

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CN114709397A
CN114709397A CN202210397084.1A CN202210397084A CN114709397A CN 114709397 A CN114709397 A CN 114709397A CN 202210397084 A CN202210397084 A CN 202210397084A CN 114709397 A CN114709397 A CN 114709397A
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positive
lithium
negative electrode
manganese
stirring
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闫筱炎
许汉良
刘克伟
李纾黎
夏信德
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Zhuhai Penghui Energy Co ltd
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Zhuhai Penghui Energy 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H01M4/364—Composites as mixtures
    • 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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • 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
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M4/36—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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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
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    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract

The application provides a manganese lithium ion laminate battery and preparation method thereof, this manganese lithium ion laminate battery that rolls has adjusted the solubility of manganese through mixing nickel cobalt lithium manganate and rich lithium manganese base material in anodal raw materials lithium manganate, has optimized the stability of lithium manganate crystal structure, has guaranteed the stability of normal atmospheric temperature and high temperature cycle performance when having improved battery capacity, compares in pure lithium manganate lithium ion battery on normal atmospheric temperature and high temperature cycle performance and has great promotion. And electrolyte adopts ethylene carbonate, ethyl methyl carbonate, diethyl carbonate, lithium hexafluorophosphate, two lithium oxalato borate, 1, 3-propane sultone, ethylene carbonate, triphenyl phosphite, compares in using prior art's electrolyte, and the manganese system lithium ion laminate battery that this application provided has still promoted its low temperature charging performance, has realized giving consideration to of high low temperature performance.

Description

Manganese-based lithium ion soft-package laminated battery and preparation method thereof
Technical Field
The application relates to the technical field of new energy, in particular to a manganese lithium ion soft package laminated battery and a preparation method thereof.
Background
A lithium ion battery is a type of rechargeable battery that mainly relies on lithium ions moving between a positive electrode and a negative electrode to operate. During charging and discharging, Li+And the insertion and the extraction are carried out back and forth between the two electrodes. Upon charging, Li+The lithium ion battery is extracted from the positive electrode and is inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. In recent years, with the explosive growth of light-duty two-wheeled vehicles in China, especially new-energy two-wheeled vehicles, the updating and upgrading speed of lithium ion batteries is increased, and the winding process lithium ion batteries widely applied to the 3C consumer electronics field such as mobile phones, cameras, notebook computers and the like are also beginning to be applied to the new-energy power and light-duty field. However, the limitations of the conventional winding process lithium ion battery in the aspects of uneven current distribution, high expansion force, low space utilization rate and the like become more obvious, so that the lithium ion soft package laminated battery is smooth and easy to generate. On the whole, compared with a winding process lithium ion battery, the lithium ion soft package laminated battery has the characteristics of high energy density, long cycle life, high safety and the like, and is an important tool for further development of the industry for new energy vehicles and light-duty two-wheeled vehicles which are frequently in problem at present.
Lithium ion soft package laminated battery applied to new energy light-moving field at present usually adopts lithium manganate material, can fully satisfy market demand in multiplying power performance, price aspect, security performance. However, the existing lithium manganate material has own disadvantages, is poor in self stability, high-temperature performance, cycle performance and low-temperature charging, and seriously affects the service life of the battery.
Disclosure of Invention
The utility model provides a manganese lithium ion laminate polymer battery, aim at solving current lithium ion laminate polymer battery self poor stability, high temperature performance poor, the low temperature charge poor, the circulation performance poor, decay fast scheduling problem.
In order to achieve the above purpose, the present application provides a manganese-based lithium ion soft-package laminated battery, which includes a battery cell and an electrolyte, wherein the battery cell includes a positive electrode plate and a negative electrode plate, and the positive electrode plate includes a positive current collector and a positive coating coated on the positive current collector;
the positive coating comprises the following components in percentage by mass: 85-95% of lithium manganate, 1-8% of nickel cobalt lithium manganate and 1-8% of lithium-rich manganese base.
Preferably, the electrolyte comprises, by mass: 30-45% of ethylene carbonate, 10-25% of methyl ethyl carbonate, 5-15% of diethyl carbonate, 5-15% of lithium hexafluorophosphate, 0.5-5% of lithium bis (oxalato) borate, 0.5-5% of 1, 3-propane sultone, 0.5-5% of ethylene carbonate and 0.5-5% of triphenyl phosphite.
Preferably, the negative electrode coating comprises, in mass percent: 60-90% of artificial graphite and 8-40% of electrode material.
The application also provides a preparation method of the manganese-based lithium ion soft-packaging laminated battery, which comprises the following steps:
mixing the components of the positive coating according to a ratio to obtain positive slurry;
mixing the components of the negative coating to obtain negative slurry;
respectively coating the positive electrode slurry and the negative electrode slurry on the positive current collector and the negative current collector to obtain a positive electrode piece and a negative electrode piece;
mixing the components of the electrolyte according to a ratio to obtain the electrolyte;
preparing the positive pole piece and the negative pole piece to obtain a battery core;
and coating the battery core with an aluminum-plastic film, and injecting the electrolyte to obtain the manganese lithium ion soft-package laminated battery.
Preferably, the mixing of the positive electrode coating components in proportion to obtain the positive electrode slurry includes:
mixing the lithium manganate, the nickel cobalt lithium manganate and the lithium-rich manganese base with a glue solution according to a ratio by a wet method, and carrying out first stirring;
and after the first stirring is finished, adding the positive electrode binder, the positive electrode conductive agent and the positive electrode additive according to the proportion, and carrying out second stirring to obtain the positive electrode slurry.
Preferably, the first stirring conditions are: stirring for 1-3 hours in vacuum at a stirring speed of 2000-2400 r/min;
the second stirring conditions are as follows: stirring for 1-3 hours in vacuum at a speed of 1800-2200 r/min.
Preferably, the pot-out viscosity of the positive electrode slurry is 4000-5500 mPa.s.
Preferably, the mixing of the negative electrode coating components to obtain a negative electrode slurry includes:
and (2) mixing the artificial graphite serving as the main negative electrode material, the electrode material and 0.5-5 wt% of negative electrode conductive agent serving as the auxiliary negative electrode material by a dry method, adding deionized water and 0.5-5 wt% of negative electrode binder, and stirring at a stirring speed of 800-1200 r/min in vacuum for 2-4 hours to obtain the negative electrode slurry.
Preferably, the pot-out viscosity of the negative electrode slurry is 1500-2500 mPa.s.
Preferably, the coating of the positive electrode slurry and the negative electrode slurry on the positive electrode current collector and the negative electrode current collector respectively comprises:
and respectively uniformly coating the positive electrode slurry and the negative electrode slurry on the positive electrode current collector and the negative electrode current collector on two sides, controlling the running speed of a pole piece to be 2-2.5m/min, and controlling the baking temperature to be 100-130 ℃.
Compared with the prior art, the beneficial effect of this application includes:
the application provides a manganese system lithium ion laminate battery that softly wraps has adjusted the solubility of manganese through mixing ternary (nickel cobalt lithium manganate) and rich lithium manganese base material in anodal raw materials lithium manganate, has optimized the stability of lithium manganate crystal structure, has guaranteed the stability of normal atmospheric temperature and high temperature cycle performance when having improved battery capacity, compares in pure lithium manganate lithium ion battery on normal atmospheric temperature and high temperature cycle performance and has great promotion.
The application provides an electrolyte of manganese lithium ion laminate battery that softly wraps adopts ethylene carbonate, ethyl methyl carbonate, diethyl carbonate, lithium hexafluorophosphate, two oxalic acid lithium borate, 1, 3-propane sultone, ethylene carbonate, triphenyl phosphite, compare in using prior art's electrolyte, two oxalic acid lithium borate of additive collocation ethylene carbonate and triphenyl phosphite, can effectively reduce the viscidity of electrolyte under low temperature environment, increase the mobility of lithium ion, make its conductivity of electrolyte promote 0.5-2.5 under the low temperature, thereby can effectively restrain the saturation of graphite particle surface lithium ion that solid diffusion restriction arouses (the saturation of lithium ion can induce the emergence of edge plane lithium precipitation), reach the effect that satisfies the negative pole interface of low temperature charging and do not precipitate lithium, the manganese lithium ion laminate battery that softly wraps that provides has still promoted its low temperature charging performance, the high and low temperature performance is realized.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments are briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope of the present application.
Fig. 1 is a schematic diagram of a cell structure of a lithium ion soft package laminated battery according to the present application;
fig. 2 is a cross-sectional view of a lithium ion laminate pouch battery of the present application;
fig. 3 is a graph showing the results of an ordinary temperature cycle test of lithium ion laminate flexible packaging batteries according to examples and comparative examples of the present application;
fig. 4 is a graph showing experimental results of high temperature cycling of lithium ion laminate soft pack batteries according to examples and comparative examples of the present application;
fig. 5 is a graph showing the results of low-temperature cycle experiments of lithium ion laminate flexible batteries according to examples and comparative examples of the present application;
fig. 6 is an exploded view of the interface of the lithium ion laminate pouch battery of each example of the present application and comparative example;
fig. 7 is a schematic flow chart of a method for manufacturing a manganese-based lithium ion soft-packaging laminated battery according to the present application.
Reference numerals are as follows:
1-a barrier film; 2-positive pole piece; 3-negative pole piece; 4-a negative electrode tab; 5-positive pole tab.
Detailed Description
The terms as used herein:
"prepared from … …" is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
The conjunction "consisting of … …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of … …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when the range "1 ~ 5" is disclosed, the ranges described should be interpreted to include the ranges "1 ~ 4", "1 ~ 3", "1 ~ 2 and 4 ~ 5", "1 ~ 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
In the examples, the parts and percentages are by mass unless otherwise indicated.
"part by mass" means a basic unit of measure indicating a mass ratio of a plurality of components, and 1 part may represent any unit mass, for example, 1g or 2.689 g. If we say that the part by mass of the component A is a part by mass and the part by mass of the component B is B part by mass, the ratio of the part by mass of the component A to the part by mass of the component B is a: b. alternatively, the mass of the A component is aK and the mass of the B component is bK (K is an arbitrary number, and represents a multiple factor). It is unmistakable that, unlike the parts by mass, the sum of the parts by mass of all the components is not limited to 100 parts.
"and/or" is used to indicate that one or both of the illustrated conditions may occur, e.g., a and/or B includes (a and B) and (a or B).
The application provides a manganese lithium ion laminate battery that wraps, as shown in fig. 1 and fig. 2, including electric core, electrolyte and plastic-aluminum membrane, electric core includes barrier film 1, positive pole piece 2, negative pole piece 3, negative pole utmost point ear 4, positive pole utmost point ear 5, barrier film 1 can be for example polyethylene micropore diaphragm, barrier film 1 is located between positive pole piece 2 and the negative pole piece 3, the lamination forms the lamination electricity core after adding pad barrier film 1 in the middle of positive pole piece 2 and the negative pole piece 3, carry out the electrolyte injection after the plastic-aluminum membrane cladding and form lithium ion laminate battery that wraps.
Wherein, the isolating membrane 1 is a polyethylene microporous membrane with the thickness of 20-30 μm; the positive pole piece 2 comprises a positive current collector and a positive coating coated on the positive current collector; the negative pole piece 3 comprises a negative pole current collector and a negative pole coating coated on the negative pole current collector. The positive electrode current collector may be, for example, an aluminum current collector, and the negative electrode current collector may be, for example, a copper current collector.
The positive coating comprises the following components in percentage by mass: 85-95% of lithium manganate, 1-8% of nickel cobalt lithium manganate and 1-8% of lithium-rich manganese base. The lithium manganate may be, for example, (85, 86, 87, 88, 89, 90, 91, 92, 93, 94 or 95)%, or any value between 85 and 95%. The lithium nickel cobalt manganese oxide can be, for example, (1, 2, 3, 4, 5, 6, 7, or 8)%, or any value between 1 and 8%. The lithium-rich manganese group may be, for example, (1, 2, 3, 4, 5, 6, 7, or 8)%, or any value between 1 and 8%.
According to the manganese-based lithium ion soft package laminated battery, the ternary (nickel cobalt lithium manganate) and the lithium-rich manganese-based material are mixed in the lithium manganate serving as the anode raw material, so that the solubility of manganese is adjusted, the stability of a lithium manganate crystal structure is optimized, and the stability of normal-temperature and high-temperature cycle performance is ensured while the battery capacity is improved.
And the positive coating adopts high-content lithium manganate, low-content nickel cobalt lithium manganate and a lithium-rich manganese base, the price of the lithium manganate is lower than that of the lithium-rich manganese base, and the price of the lithium-rich manganese base is lower than that of the nickel cobalt lithium manganate, so that the cost can be reduced while the performance of the manganese lithium ion soft-package laminated battery is ensured.
Preferably, the positive electrode coating layer further includes: 0.5-5% of positive electrode binder, 0.5-5% of positive electrode conductive agent and 0.5-5% of positive electrode additive.
The positive electrode binder may be, for example, polyvinylidene fluoride; the positive electrode conductive agent may be one or a mixture of two or more of carbon black, carbon nanotubes, conductive graphite and carbon fibers, and the positive electrode additive may be one or a mixture of two or more of acetyl trioctyl citrate, tributyl citrate and dioctyl phthalate.
Preferably, the negative electrode coating comprises, in mass percent: 60-90% of artificial graphite and 8-40% of electrode material.
The artificial graphite may be, for example, (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, or 90)%, or any value between 60 and 90%; the electrode material may be, for example, (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, or 40)%, or any value between 8 and 40%.
In a preferred embodiment, the electrolyte comprises, in mass percent: 30-45% of ethylene carbonate, 10-25% of methyl ethyl carbonate, 5-15% of diethyl carbonate, 5-15% of lithium hexafluorophosphate, 0.5-5% of lithium bis (oxalato) borate, 0.5-5% of 1, 3-propane sultone, 0.5-5% of ethylene carbonate and 0.5-5% of triphenyl phosphite.
The ethylene carbonate may be, for example, (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, or 45)%, or any value between 30% and 45%; ethyl methyl carbonate may be, for example, (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25)%, or any value between 10-25%; diethyl carbonate may be, for example, (5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15)%, or any value between 5 and 15%; lithium hexafluorophosphate, for example, may be (5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15), or any value between 5 and 15%; lithium bis (oxalato) borate can be, for example, (0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, or 5)%, or any value between 0.5 and 5%; the 1, 3-propane sultone can be, for example, (0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, or 5)%, or any value between 0.5-5%; the ethylene carbonate may be, for example, (0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, or 5)%, or any value between 0.5 and 5%; triphenyl phosphite may be, for example, (0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, or 5)%, or any value between 0.5 and 5%.
By adopting the electrolyte formula of the embodiment, the additive lithium bis (oxalato) borate is matched with the ethylene carbonate and the triphenyl phosphite, the viscosity of the electrolyte in a low-temperature environment can be effectively reduced, the mobility of lithium ions is increased, and the conductivity of the electrolyte at a low temperature is improved by 0.5-2.5%, so that the saturation of the lithium ions on the surface of graphite particles caused by the limitation of solid diffusion (the saturation of the lithium ions can induce the occurrence of lithium precipitation on an edge plane) can be effectively inhibited, the effect of no lithium precipitation on a low-temperature charging negative electrode interface is achieved, the normal-temperature and high-temperature cycle performance of the battery is slightly damaged, no corrosion effect exists at a higher voltage, the low-temperature charging performance of the battery can be correspondingly improved, and the service life of the battery in the low-temperature environment is prolonged.
The present application further provides a method for manufacturing the manganese-based lithium ion soft-package laminated battery, referring to fig. 7, including:
s10: and mixing the components of the anode coating according to a ratio to obtain anode slurry.
Preferably, the mixing of the positive electrode coating components in proportion to obtain the positive electrode slurry includes:
mixing the lithium manganate, the nickel cobalt lithium manganate and the lithium-rich manganese base with a glue solution according to a ratio by a wet method, and carrying out first stirring;
and after the first stirring is finished, adding the positive binder, the positive conductive agent and the positive additive according to the ratio, and carrying out second stirring to obtain the positive slurry.
Preferably, the first stirring conditions are: stirring for 1-3 hours in vacuum, wherein the stirring speed is 2000-2400 r/min;
the second stirring conditions are as follows: stirring for 1-3 hours in vacuum, wherein the stirring speed is 1800-2200 r/min.
The vacuum stirring time of the first stirring may be, for example, (1, 1.5, 2.0, 2.5, or 3) hours, or any value between 1 and 3 hours; the stirring speed can be (2000, 2100, 2200, 2300 or 2400) r/min or any value between 2000 and 2400 r/min.
The vacuum stirring time of the second stirring may be, for example, (1, 1.5, 2.0, 2.5, or 3) hours, or any value between 1 and 3 hours; the stirring speed may be (1800, 1900, 2000, 2100 or 2200) r/min or any value between 1800 and 2200 r/min.
Preferably, the pot-out viscosity of the positive electrode slurry is 4000-5500 mPa.s.
S20: and mixing the negative coating components to obtain negative slurry.
Preferably, the mixing of the negative electrode coating components to obtain the negative electrode slurry comprises:
and (2) mixing the artificial graphite serving as the main negative electrode material, the electrode material and 0.5-5 wt% of negative electrode conductive agent serving as the auxiliary negative electrode material by a dry method, adding deionized water and 0.5-5 wt% of negative electrode binder, and stirring at a stirring speed of 800-1200 r/min in vacuum for 2-4 hours to obtain the negative electrode slurry.
The negative electrode conductive agent may be, for example, one or a mixture of two or more of carbon black, carbon nanotubes, conductive graphite, and carbon fibers.
The negative electrode binder may be any one or more of sodium carboxymethylcellulose and styrene butadiene rubber, for example.
The stirring speed can be (800, 900, 1000, 1100 or 1200) r/min or any value between 800 and 1200 r/min; the vacuum stirring time may be (2, 2.5, 3.0, 3.5, or 4) hours, or any value between 2 and 4 hours.
Preferably, the viscosity of the cathode slurry taken out of the boiler is 1500-2500 mPa.s.
S30: and respectively coating the positive electrode slurry and the negative electrode slurry on the positive current collector and the negative current collector to obtain a positive electrode piece and a negative electrode piece.
Preferably, the coating of the positive electrode slurry and the negative electrode slurry on the positive electrode current collector and the negative electrode current collector respectively comprises:
and respectively uniformly coating the positive electrode slurry obtained in the step S10 and the negative electrode slurry obtained in the step S20 on the positive electrode current collector and the negative electrode current collector on two sides, controlling the running speed of a pole piece to be 2-2.5m/min, and controlling the baking temperature to be 100-130 ℃.
The running speed of the pole piece can be (2, 2.1, 2.2, 2.3, 2.4 or 2.5) m/min or any value between 2 and 2.5 m/min; the baking temperature may be (100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 11, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, or 130) DEG C, or any value between 100 and 130 ℃.
S40: and mixing the components of the electrolyte according to a ratio to obtain the electrolyte.
In a preferred embodiment, 30 to 45 wt% of ethylene carbonate, 10 to 25 wt% of ethyl methyl carbonate, 5 to 15 wt% of diethyl carbonate, 5 to 15 wt% of lithium hexafluorophosphate, 0.5 to 5 wt% of lithium bis (oxalato) borate, 0.5 to 5 wt% of 1, 3-propane sultone, 0.5 to 5 wt% of ethylene carbonate, and 0.5 to 5 wt% of triphenyl phosphite are mixed to complete the preparation of the electrolyte.
S50: and preparing the positive pole piece and the negative pole piece to obtain the battery core.
And placing an isolating film between the manufactured positive and negative pole pieces, and overlapping the isolating film and the pole lugs to form small battery cell monomers, wherein a plurality of small battery cell monomers are overlapped and connected in parallel through a lamination process to form the battery cell.
S60: and coating the battery core with an aluminum-plastic film, and injecting the electrolyte to obtain the manganese lithium ion soft-package laminated battery.
Embodiments of the present application will be described in detail below with reference to specific examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
S1, mixing a positive electrode main material comprising 88 mass percent of lithium manganate, 4 mass percent of ternary (nickel cobalt lithium manganate) and 5 mass percent of lithium-rich manganese base with a glue solution by a wet method, stirring for 2 hours in vacuum at a stirring speed of 2200r/min, and uniformly stirring;
s2, after the anode material in the first stage is stirred, adding 1 wt% of carbon black, 0.5 wt% of carbon nano tubes, 0.5 wt% of acetyl trioctyl citrate, tributyl citrate and 1 wt% of polyvinylidene fluoride as an anode auxiliary material, and then stirring in vacuum at a stirring speed of 2000r/min for 2 hours, and controlling the viscosity of the anode slurry discharged from a pot to be 4000-5500 mPa.s;
s3, mixing 70 wt% of artificial graphite, 24 wt% of electrode material and 3.5 wt% of carbon black serving as auxiliary materials of the negative electrode by a dry method, adding deionized water, 2.5 wt% of sodium carboxymethylcellulose and styrene butadiene rubber, wherein the adding amount of the deionized water meets the requirement that the content of solid powder in the mixture is 50% -60%, then carrying out vacuum stirring at a stirring speed of 1000r/min for 3 hours, uniformly stirring, and controlling the viscosity of the negative electrode slurry discharged from a pot to be 1500-2500 mPa.s;
s4, uniformly coating the two sides of the anode slurry and the cathode slurry which are taken out of the pot on an aluminum current collector and a copper current collector, and controlling the running speed and the baking temperature of the pole piece to be 2-2.5m/min and 115 ℃ respectively to finish the manufacture of the anode and cathode pole pieces;
s5, mixing and proportioning 45 wt% of ethylene carbonate, 25 wt% of ethyl methyl carbonate, 13 wt% of diethyl carbonate, 11 wt% of lithium hexafluorophosphate, 2 wt% of lithium bis (oxalato) borate, 2 wt% of 1, 3-propane sultone and 2 wt% of triphenyl phosphite to finish the preparation of the electrolyte;
s6, placing a separation film between the manufactured positive and negative pole pieces, overlapping the separation film with the pole lugs to form small cell monomers, overlapping the small cell monomers through a lamination process, connecting the small cell monomers in parallel to form the cell, coating the cell with the outer layer of the aluminum plastic film, and injecting the electrolyte to complete the preparation of the soft-pack laminated lithium ion battery.
Example 2
S1, mixing a positive electrode main material comprising 88 mass percent of lithium manganate, 4 mass percent of ternary (nickel cobalt lithium manganate) and 5 mass percent of lithium-rich manganese base with a glue solution by a wet method, stirring for 2 hours in vacuum at a stirring speed of 2200r/min, and uniformly stirring;
s2, after the anode material in the first stage is stirred, adding 1 wt% of carbon black, 0.5 wt% of carbon nano tubes, 0.5 wt% of acetyl trioctyl citrate, tributyl citrate and 1 wt% of polyvinylidene fluoride as an anode auxiliary material, and then stirring in vacuum at a stirring speed of 2000r/min for 2 hours, and controlling the viscosity of the anode slurry discharged from a pot to be 4000-5500 mPa.s;
s3, mixing 70 wt% of artificial graphite as a main negative electrode material, 24 wt% of an electrode material and 3.5 wt% of carbon black as an auxiliary negative electrode material by a dry method, adding deionized water, 2.5 wt% of sodium carboxymethylcellulose and styrene butadiene rubber, wherein the adding amount of the deionized water meets the requirement that the content of solid powder in the mixture is 50-60%, then carrying out vacuum stirring at a stirring speed of 1000r/min for 3 hours, uniformly stirring the mixture, and controlling the viscosity of the negative electrode slurry discharged from a boiler to be 1500-2500 mPa.s;
s4, uniformly coating the two sides of the anode slurry and the cathode slurry which are taken out of the pot on an aluminum current collector and a copper current collector, and controlling the running speed and baking temperature of the pole piece to be 2-2.5m/min and 115 ℃ to finish the manufacture of the anode and cathode pole pieces;
s5, mixing and proportioning 45 wt% of ethylene carbonate, 25 wt% of ethyl methyl carbonate, 13 wt% of diethyl carbonate, 11 wt% of lithium hexafluorophosphate, 2 wt% of lithium bis (oxalato) borate, 2 wt% of 1, 3-propane sultone and 2 wt% of ethylene carbonate to finish the preparation of the electrolyte;
s6, placing a separation film between the manufactured positive and negative pole pieces, overlapping the separation film with the pole lugs to form small cell monomers, overlapping the small cell monomers through a lamination process, connecting the small cell monomers in parallel to form the cell, coating the cell with the outer layer of the aluminum plastic film, and injecting the electrolyte to complete the preparation of the soft-pack laminated lithium ion battery.
Example 3
S1, mixing a positive electrode main material comprising 88 mass percent of lithium manganate, 4 mass percent of ternary (nickel cobalt lithium manganate) and 5 mass percent of lithium-rich manganese base with a glue solution by a wet method, stirring for 2 hours in vacuum at a stirring speed of 2200r/min, and uniformly stirring;
s2, after the anode material in the first stage is stirred, adding 1 wt% of carbon black, 0.5 wt% of carbon nano tubes, 0.5 wt% of acetyl trioctyl citrate, tributyl citrate and 1 wt% of polyvinylidene fluoride as an anode auxiliary material, and then stirring in vacuum at a stirring speed of 2000r/min for 2 hours, and controlling the viscosity of the anode slurry discharged from a pot to be 4000-5500 mPa.s;
s3, mixing 70 wt% of artificial graphite, 24 wt% of electrode material and 3.5 wt% of carbon black serving as auxiliary materials of the negative electrode by a dry method, adding deionized water, 2.5 wt% of sodium carboxymethylcellulose and styrene butadiene rubber, wherein the adding amount of the deionized water meets the requirement that the content of solid powder in the mixture is 50% -60%, then carrying out vacuum stirring at a stirring speed of 1000r/min for 3 hours, uniformly stirring, and controlling the viscosity of the negative electrode slurry discharged from a pot to be 1500-2500 mPa.s;
s4, uniformly coating the two sides of the anode slurry and the cathode slurry which are taken out of the pot on an aluminum current collector and a copper current collector, and controlling the running speed and baking temperature of the pole piece to be 2-2.5m/min and 115 ℃ to finish the manufacture of the anode and cathode pole pieces;
s5, mixing and proportioning 45 wt% of ethylene carbonate, 25 wt% of ethyl methyl carbonate, 13 wt% of diethyl carbonate, 11 wt% of lithium hexafluorophosphate, 2 wt% of 1, 3-propane sultone, 2 wt% of ethylene carbonate and 2 wt% of triphenyl phosphite to finish the preparation of the electrolyte;
s6, placing a separation film between the manufactured positive and negative pole pieces, overlapping the separation film with the pole lugs to form small cell monomers, overlapping the small cell monomers through a lamination process, connecting the small cell monomers in parallel to form the cell, coating the cell with the outer layer of the aluminum plastic film, and injecting the electrolyte to complete the preparation of the soft-pack laminated lithium ion battery.
Example 4
S1, mixing a positive electrode main material comprising 88 mass percent of lithium manganate, 4 mass percent of ternary (nickel cobalt lithium manganate) and 5 mass percent of lithium-rich manganese base with a glue solution by a wet method, stirring for 2 hours in vacuum at a stirring speed of 2200r/min, and uniformly stirring;
s2, after the anode material in the first stage is stirred, adding 1 wt% of carbon black, 0.5 wt% of carbon nano tubes, 0.5 wt% of acetyl trioctyl citrate, tributyl citrate and 1 wt% of polyvinylidene fluoride as an anode auxiliary material, and then stirring in vacuum at a stirring speed of 2000r/min for 2 hours, and controlling the viscosity of the anode slurry discharged from a pot to be 4000-5500 mPa.s;
s3, mixing 70 wt% of artificial graphite, 24 wt% of electrode material and 3.5 wt% of carbon black serving as auxiliary materials of the negative electrode by a dry method, adding deionized water, 2.5 wt% of sodium carboxymethylcellulose and styrene butadiene rubber, wherein the adding amount of the deionized water meets the requirement that the content of solid powder in the mixture is 50% -60%, then carrying out vacuum stirring at a stirring speed of 1000r/min for 3 hours, uniformly stirring, and controlling the viscosity of the negative electrode slurry discharged from a pot to be 1500-2500 mPa.s;
s4, uniformly coating the two sides of the anode slurry and the cathode slurry which are taken out of the pot on an aluminum current collector and a copper current collector, and controlling the running speed and baking temperature of the pole piece to be 2-2.5m/min and 115 ℃ to finish the manufacture of the anode and cathode pole pieces;
s5, mixing and proportioning 45 wt% of ethylene carbonate, 25 wt% of ethyl methyl carbonate, 13 wt% of diethyl carbonate, 11 wt% of lithium hexafluorophosphate, 2 wt% of lithium bis (oxalato) borate, 2 wt% of 1, 3-propane sultone, 1 wt% of ethylene carbonate and 1 wt% of triphenyl phosphite to finish the preparation of the electrolyte;
s6, placing a separation film between the manufactured positive and negative pole pieces, overlapping the separation film with the pole lugs to form small cell monomers, overlapping the small cell monomers through a lamination process, connecting the small cell monomers in parallel to form the cell, coating the cell with the outer layer of the aluminum plastic film, and injecting the electrolyte to complete the preparation of the soft-pack laminated lithium ion battery.
Comparative example 1
S1, carrying out wet mixing on 97 wt% of lithium manganate serving as a main anode material and a glue solution, stirring for 2 hours in vacuum at a stirring speed of 2200r/min, and uniformly stirring;
s2, after the anode material in the first stage is stirred, adding 1 wt% of carbon black, 0.5 wt% of carbon nano tubes, 0.5 wt% of acetyl trioctyl citrate, tributyl citrate and 1 wt% of polyvinylidene fluoride as an anode auxiliary material, and then stirring in vacuum at a stirring speed of 2000r/min for 2 hours, and controlling the viscosity of the anode slurry discharged from a pot to be 4000-5500 mPa.s;
s3, mixing 70 wt% of artificial graphite, 24 wt% of electrode material and 3.5 wt% of carbon black serving as auxiliary materials of the negative electrode by a dry method, adding deionized water, 2.5 wt% of sodium carboxymethylcellulose and styrene butadiene rubber, wherein the adding amount of the deionized water meets the requirement that the content of solid powder in the mixture is 50% -60%, then carrying out vacuum stirring at a stirring speed of 1000r/min for 3 hours, uniformly stirring, and controlling the viscosity of the negative electrode slurry discharged from a pot to be 1500-2500 mPa.s;
s4, uniformly coating the two sides of the anode slurry and the cathode slurry which are taken out of the pot on an aluminum current collector and a copper current collector, and controlling the running speed and baking temperature of the pole piece to be 2-2.5m/min and 115 ℃ to finish the manufacture of the anode and cathode pole pieces;
s5, mixing and proportioning 45 wt% of ethylene carbonate, 25 wt% of ethyl methyl carbonate, 13 wt% of diethyl carbonate, 11 wt% of lithium hexafluorophosphate, 2 wt% of lithium bis (oxalato) borate, 2 wt% of 1, 3-propane sultone and 2 wt% of triphenyl phosphite to finish the preparation of the electrolyte;
s6, placing a separation film between the manufactured positive and negative pole pieces, overlapping the separation film with the pole lugs to form small cell monomers, overlapping the small cell monomers through a lamination process, connecting the small cell monomers in parallel to form the cell, coating the cell with the outer layer of the aluminum plastic film, and injecting the electrolyte to complete the preparation of the soft-pack laminated lithium ion battery.
Comparative example 2
S1, carrying out wet mixing on 97 wt% of lithium manganate serving as a positive electrode main material and a glue solution, carrying out vacuum stirring for 2 hours at a stirring speed of 2200r/min, and uniformly stirring;
s2, after the anode material in the first stage is stirred, adding 1 wt% of carbon black, 0.5 wt% of carbon nano tubes, 0.5 wt% of acetyl trioctyl citrate, tributyl citrate and 1 wt% of polyvinylidene fluoride as an anode auxiliary material, and then stirring in vacuum at a stirring speed of 2000r/min for 2 hours, and controlling the viscosity of the anode slurry discharged from a pot to be 4000-5500 mPa.s;
s3, mixing 70 wt% of artificial graphite, 24 wt% of electrode material and 3.5 wt% of carbon black serving as auxiliary materials of the negative electrode by a dry method, adding deionized water, 2.5 wt% of sodium carboxymethylcellulose and styrene butadiene rubber, wherein the adding amount of the deionized water meets the requirement that the content of solid powder in the mixture is 50% -60%, then carrying out vacuum stirring at a stirring speed of 1000r/min for 3 hours, uniformly stirring, and controlling the viscosity of the negative electrode slurry discharged from a pot to be 1500-2500 mPa.s;
s4, uniformly coating the two sides of the anode slurry and the cathode slurry which are taken out of the pot on an aluminum current collector and a copper current collector, and controlling the running speed and baking temperature of the pole piece to be 2-2.5m/min and 115 ℃ to finish the manufacture of the anode and cathode pole pieces;
s5, mixing and proportioning 45 wt% of ethylene carbonate, 25 wt% of ethyl methyl carbonate, 13 wt% of diethyl carbonate, 11 wt% of lithium hexafluorophosphate, 2 wt% of lithium bis (oxalato) borate, 2 wt% of 1, 3-propane sultone, 1 wt% of ethylene carbonate and 1 wt% of triphenyl phosphite to complete preparation of the electrolyte;
s6, placing a separation film between the manufactured positive and negative pole pieces, overlapping the separation film with the pole lugs to form small cell monomers, overlapping the small cell monomers through a lamination process, connecting the small cell monomers in parallel to form the cell, coating the cell with the outer layer of the aluminum plastic film, and injecting the electrolyte to complete the preparation of the soft-pack laminated lithium ion battery.
Results of the experiment
The manganese-based lithium ion soft-packaging laminated battery obtained in the above examples 1 to 4 and comparative examples 1 and 2 were subjected to normal temperature cycle, high temperature cycle and low temperature cycle, respectively, and the capacity retention rate of the battery after cycling at each temperature was measured, and the results are shown in fig. 3 to 5.
Wherein, fig. 3 is a 25 ℃ normal temperature cycle result chart, fig. 4 is a 45 ℃ high temperature cycle result chart, and fig. 5 is a-10 ℃ low temperature cycle result chart. As can be seen from fig. 3 and 4, the capacity retention rate of the manganese-based lithium ion soft-package laminated battery of the embodiments 1 to 4 is greater than 92.91% when the battery is cycled to 283 weeks at normal temperature and greater than 89.74% when the battery is cycled to 189 weeks at high temperature, and compared with the pure lithium manganate lithium ion battery, the capacity retention rates of the battery in normal temperature cycle and high temperature cycle are respectively improved by 18.47% and 23.21%.
As can be seen from fig. 5, the capacity retention rate of the manganese-based lithium ion soft-packed laminate batteries of example 4 and comparative example 2 was 99.15% at the time of low-temperature cycling to 10 weeks, which is improved by 45.72% compared to the manganese-based lithium ion soft-packed laminate batteries of comparative example 1 and examples 1 to 3.
As shown in fig. 6, the manganese-based lithium ion soft pack laminated batteries obtained in examples 1 to 4 and comparative examples 1 and 2 were subjected to interfacial disassembly after full charge, and as a result, in fig. 6, (a) is the battery of example 1, (b) is the battery of example 2, (c) is the battery of example 3, (d) is the battery of example 4, (e) is the battery of comparative example 1, and (f) is the battery of comparative example 2, it is apparent from fig. 6 that the surfaces of the negative electrode sheets of the manganese-based lithium ion soft pack laminated batteries of examples 4 and comparative examples 2 are golden yellow, and no lithium precipitation occurs.
The manganese-based lithium ion soft-package laminated battery in the embodiment 4 not only has a larger improvement in normal temperature and high temperature cycle performance compared with a pure lithium manganate lithium ion battery, but also has a better low-temperature charging performance compared with the electrolyte ratios in the embodiments 1 to 3, and realizes both high and low temperature performance.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Moreover, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Claims (10)

1. The manganese-based lithium ion soft-package laminated battery is characterized by comprising an electric core and electrolyte, wherein the electric core comprises a positive pole piece and a negative pole piece, and the positive pole piece comprises a positive current collector and a positive coating coated on the positive current collector;
the positive coating comprises the following components in percentage by mass: 85-95% of lithium manganate, 1-8% of nickel cobalt lithium manganate and 1-8% of lithium-rich manganese base.
2. The manganese-based lithium ion soft laminate battery according to claim 1, wherein the electrolyte comprises, in mass percent: 30-45% of ethylene carbonate, 10-25% of methyl ethyl carbonate, 5-15% of diethyl carbonate, 5-15% of lithium hexafluorophosphate, 0.5-5% of lithium bis (oxalato) borate, 0.5-5% of 1, 3-propane sultone, 0.5-5% of ethylene carbonate and 0.5-5% of triphenyl phosphite.
3. The manganese-based lithium ion soft laminate battery according to claim 1, wherein the negative electrode coating comprises, in mass percent: 60-90% of artificial graphite and 8-40% of electrode material.
4. A method for preparing a manganese-based lithium ion laminate soft pack battery according to any one of claims 1 to 3, comprising:
mixing the components of the positive coating according to a ratio to obtain positive slurry;
mixing the components of the negative coating to obtain negative slurry;
respectively coating the positive electrode slurry and the negative electrode slurry on the positive current collector and the negative current collector to obtain a positive electrode piece and a negative electrode piece;
mixing the components of the electrolyte according to a ratio to obtain the electrolyte;
preparing the positive pole piece and the negative pole piece to obtain a battery core;
and coating the battery core with an aluminum-plastic film, and injecting the electrolyte to obtain the manganese lithium ion soft-package laminated battery.
5. The preparation method of claim 4, wherein the mixing of the positive coating components in proportion to obtain the positive slurry comprises:
mixing the lithium manganate, the nickel cobalt lithium manganate and the lithium-rich manganese base with a glue solution according to a ratio by a wet method, and carrying out first stirring;
and after the first stirring is finished, adding the positive electrode binder, the positive electrode conductive agent and the positive electrode additive according to the proportion, and carrying out second stirring to obtain the positive electrode slurry.
6. The method according to claim 5, wherein the first stirring condition is: stirring for 1-3 hours in vacuum at a stirring speed of 2000-2400 r/min;
the second stirring conditions are as follows: stirring for 1-3 hours in vacuum at a speed of 1800-2200 r/min.
7. The production method according to claim 5 or 6, wherein the pot viscosity of the positive electrode slurry is 4000 to 5500 mPa.s.
8. The preparation method according to claim 4, wherein the mixing of the negative electrode coating components to obtain a negative electrode slurry comprises:
and (2) mixing the artificial graphite serving as the main negative electrode material, the electrode material and 0.5-5 wt% of negative electrode conductive agent serving as an auxiliary negative electrode material by a dry method, adding deionized water and 0.5-5 wt% of negative electrode binder, and stirring at a stirring speed of 800-1200 r/min in vacuum for 2-4 hours to obtain the negative electrode slurry.
9. The production method according to claim 7 or 8, wherein the pot viscosity of the negative electrode slurry is 1500 to 2500 mPa.s.
10. The preparation method according to claim 4, wherein the coating of the positive electrode slurry and the negative electrode slurry on the positive electrode current collector and the negative electrode current collector, respectively, comprises:
and respectively uniformly coating the positive electrode slurry and the negative electrode slurry on the positive electrode current collector and the negative electrode current collector on two sides, controlling the running speed of a pole piece to be 2-2.5m/min, and controlling the baking temperature to be 100-130 ℃.
CN202210397084.1A 2022-04-15 2022-04-15 Manganese-based lithium ion soft-package laminated battery and preparation method thereof Pending CN114709397A (en)

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