CN109616635B - Viscoelastic raw material of battery pole piece, raw material preparation method and pole piece preparation method - Google Patents

Viscoelastic raw material of battery pole piece, raw material preparation method and pole piece preparation method Download PDF

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CN109616635B
CN109616635B CN201811465859.4A CN201811465859A CN109616635B CN 109616635 B CN109616635 B CN 109616635B CN 201811465859 A CN201811465859 A CN 201811465859A CN 109616635 B CN109616635 B CN 109616635B
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pole piece
preparation
battery pole
raw material
viscoelastic
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CN109616635A (en
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丁波
高桥勉
李思文贤
黄飞
杨清宇
陈飞
曹翊
车勇
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Beijing Enli Power Technology Co ltd
Enli Energy Technology Anhui Co ltd
Enli Energy Technology Nantong Co ltd
Enpower Energy Technology Co ltd
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Enli Energy Technology Anhui Co ltd
Enli Energy Technology Nantong Co ltd
Enpower Energy 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • 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
    • H01M10/36—Accumulators not provided for in groups H01M10/05-H01M10/34
    • 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
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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
    • 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
    • H01M4/56—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of lead
    • H01M4/57—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of lead of "grey lead", i.e. powders containing lead and lead oxide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621—Binders
    • H01M4/622—Binders being polymers
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • 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 invention discloses a viscoelastic raw material of a battery pole piece, a raw material preparation method and a pole piece preparation method, and belongs to the field of battery manufacturing. The thick film pole piece is produced through the unique viscoelastic raw material design with the solid content of 40-80% and the viscoelastic degree of 1000-5000 MPa. The automatic manufacturing of the battery pole piece is completed through the processes of high-speed mixing of raw materials → kneading of the mixed raw materials → extrusion molding → membrane preparation → dry coating and rolling molding → pole piece preparation and the like. Compared with the existing kneading and open milling process, the scheme increases the loading range of the active substances of the battery pole piece to 0.1-0.7g/cm2The amount of auxiliary materials is reduced in the manufacturing process; not only degree of automation is high, has still improved the uniformity of production efficiency and pole piece.

Description

Viscoelastic raw material of battery pole piece, raw material preparation method and pole piece preparation method
Technical Field
The invention relates to the field of battery manufacturing, in particular to a viscoelastic raw material of a battery pole piece, a raw material preparation method and a pole piece preparation method.
Background
Resource-based fossil fuels have remained a major source of human power to date. Carbon emission caused by the heavy use of the carbon is a main cause of the current global warming effect. As one of the important solutions, it is urgent to develop and utilize renewable energy sources including solar energy and wind energy for power generation. However, these natural energy sources, including solar energy, wind energy, tidal energy, etc., are intermittent, and the amount of electric energy generated is heavily dependent on natural factors such as weather, season, time, and place. These unstable electrical energy, if incorporated directly into the grid, can severely interfere with the normal operation of the grid. The adoption of the large-scale energy storage system can effectively solve the problem, and intermittent energy generated by renewable natural resources can be accessed into a power grid through the storage and release of the energy storage system, so that a user end can obtain stable, safe and efficient clean energy.
At present, the main energy storage technologies include electrochemical energy storage, mechanical energy storage, chemical energy storage, electrical energy storage, phase change energy storage, and the like. Compared with other energy storage modes, the electrochemical energy storage technology has the characteristics of high efficiency, low investment, safe use, flexible application and the like, and is most in line with the development direction of current energy. Among various electrochemical storage methods, the secondary battery is most convenient to use and maintain. However, the current mature secondary battery systems are almost not suitable for large-scale energy storage application. The traditional lead-acid and cadmium-nickel batteries contain a large amount of harmful heavy metal elements, can cause serious environmental pollution in the production and waste stages when being applied in a large scale, have strict requirements on environmental temperature, are only suitable for indoor operation environments, and have short service life and low cost performance; the nickel-metal hydride battery adopts expensive rare metal, is difficult to meet the cost requirement of large-scale electricity storage in terms of resources and price, and has poor high-temperature performance and low working voltage. The all-vanadium redox flow battery adopts noble metals and also has expensive ion exchange membranes, and the anode electrolyte and the cathode electrolyte have the problems of toxicity, corrosivity, low energy conversion efficiency and the like; the sodium-sulfur battery has extremely high working temperature and high price, and the liquid sulfur and the metal sodium also have strong corrosivity on the alumina diaphragm, thereby easily causing combustion accidents. The water system ion battery adopts neutral saline solution as electrolyte, which not only avoids the flammability problem of organic electrolyte, but also overcomes the defects of high pollution, short service life (such as lead-acid battery) and high price (nickel-hydrogen battery) of the traditional water system battery, has the characteristics of safety, low cost, long service life, environmental protection, recoverability and the like, is a brand new novel battery, and is an ideal system with large-scale energy storage technical requirements.
With the wide application of the energy storage battery in new energy industries such as photovoltaic industry, wind power industry and the like, the energy storage battery has a wide development prospect; in the existing battery pole piece forming process, the slurry drawing and coating process is mostly adopted, the active substance loading capacity of the produced pole piece is small, the using amount of auxiliary materials is large, and if the kneading and milling process is used, the required pole piece loading capacity can be achieved.
For aqueous ion, there are also some production processes, for example, CN108232195A discloses a method for forming a pole piece of an aqueous ion battery based on a polytetrafluoroethylene binder, which comprises: step 1) taking ceramic powder and an inorganic carbon source conductive agent used by a water-based ion battery electrode as raw materials, taking water as a solvent, adding polytetrafluoroethylene as a binder, and performing ball milling to obtain uniform slurry; step 2) filtering the obtained slurry to obtain a filter cake, and further drying the obtained filter cake to obtain dry powder; step 3) granulating and sieving the obtained dry powder to obtain granular powder with uniform granularity; and 4) preparing the battery pole pieces in batches by using the obtained granular powder by a dry pressing method. The invention adopts a mode of ball milling slurry preparation and combined granulation, the obtained powder is granular, the flowability problem of the powder caused by the binder is greatly improved, the pole piece forming is easy to control, and the method is suitable for preparing the thick pole piece by adopting dry pressing forming. But it is mainly that the key lies in the viscoelastic raw materials, and viscoelastic raw materials has given approximate performance, but, in the technology, can not solve the problem of safe operation among the prior art, production efficiency is low.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems of small loading range of active substances of the battery pole piece, large using amount of auxiliary materials, low production efficiency and poor consistency in the prior art, the invention provides a viscoelastic raw material of the battery pole piece, a raw material preparation method and a pole piece preparation method, which reduce the using amount of the auxiliary materials and increase the loading range of the active substances of the battery pole piece; the battery pole piece is prepared by the dry coating process, so that the automation degree is high, and the production efficiency and the consistency of the pole piece are improved.
2. Technical scheme
The purpose of the invention is realized by the following technical scheme.
A viscoelastic raw material of a battery pole piece comprises the following substances,
lead powder with the mass ratio of 0.5-5 percent and indissolvable and slightly soluble salt of 60-89.5 percent of lead, wherein the indissolvable and slightly soluble salt is one or a mixture of more than two of lead oxide, lead sulfate, lead carbonate, lead phosphate, lead hydrogen phosphate and lead chromate;
the conductive agent accounts for 6-30% of the mass ratio, and is one or a mixture of more than two of active carbon, carbon black, carbon fiber, carbon foam, acetylene black, Keqin black, KS-6, SFG-6, SP, mesoporous carbon, carbon nano tubes, graphite and graphene;
0.2 to 5 percent of additive by mass, wherein the additive is one or a mixture of more than two of calcium sulfate, barium sulfate, calcium hydroxide, ferric hydroxide, magnesium hydroxide and the like;
3-15% of a binder in a mass ratio, wherein the binder is one or a mixture of polyethylene oxide, polypropylene oxide, polyacrylonitrile, polyimide, polyester, polytetrafluoroethylene, a fluorinated polymer, polydivinyl polyethylene glycol, polyethylene glycol diacrylate and polyethylene glycol dimethacrylate.
A preparation method of a viscoelastic raw material of a battery pole piece comprises the following steps,
step 1, putting the raw materials of the battery pole pieces required to be prepared according to the proportion into a mixer for uniform mixing;
step 2, putting the uniformly mixed raw materials into a kneader, adding a solvent, and kneading into a mass;
and 3, kneading and adding a binder required by the anode and cathode materials to prepare the viscoelastic raw material.
Furthermore, the speed of the mixer in the step 1 is set to be 50rpm-1000rpm, and the mixing time is 2min-30 min;
further, kneading the mixture in the kneader of the step 2 at a speed of 10rpm to 50rpm for 10min to 60 min;
furthermore, the solid content of the viscoelastic raw material generated in the step 3 is 40-80%, and the viscoelastic degree is 1000-5000 MPa.
Furthermore, the solvent in step 2 is one or more of N-methyl pyrrolidone, acetone, ethanol, propanol, deionized water, isopropanol, etc.
A preparation method of a battery pole piece comprises the following steps:
step 1, preparing a viscoelastic raw material, wherein any one of the steps is adopted to prepare the viscoelastic raw material;
step 2, preparing the membrane, namely putting the viscoelastic raw material into an extruder for extrusion, and rolling and molding the electrode membrane by using a pre-roller after extrusion;
and 3, coating and roll forming, wherein the prepared membrane pole piece is coated and roll formed to prepare the required battery pole piece.
Further, in step 2, the extrusion outlet of the extruder is selected to have a rectangular shape with a length of 50mm to 300mm and a width of 2mm to 30 mm.
Furthermore, the thickness of the electrode film sheet formed by pre-rolling is 0.1mm-30mm, and the width is 50mm-500 mm.
Furthermore, the step 3 of pole piece coating and roll forming specifically comprises the following steps:
A) the method comprises the following steps Putting the prepared membrane into a roll squeezer to carry out coating roll forming with a current collector;
B) the method comprises the following steps Dynamically baking the battery pole piece while moving forwards on baking equipment;
C) the method comprises the following steps Rolling and flattening the pole piece subjected to coating roll forming;
D) the method comprises the following steps Punching and molding the flattened pole piece on a punching machine, wherein the carrying capacity of the pole piece is 0.1g/cm2-0.7g/cm2。
Furthermore, the current collector in the step A is in a roll shape, the width of the current collector is 120mm-500mm, and the thickness of the current collector is 0.1mm-0.5 mm.
Further, the step a rolling parameters were set as: the roller speed is 0.1m/min-6m/min, and the roller gap is set as follows: 0.5mm-3 mm.
Further, the baking temperature in the step B is set to be 60-200 ℃.
Furthermore, the roll speed of the step C is 0.1m/min-6m/min, and the roll gap is set as follows: 0.5mm-3 mm.
Furthermore, the size of the pole piece punched by the punching machine in the step D is as follows: 100mm-200mm long, 100mm-200mm wide and 0.5mm-3mm thick.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
the capacity of the active substance of the pole piece produced by the dry coating process reaches 0.1-0.7g/cm2The loading range of the active substances of the pole piece in the prior art is only 0.3-0.5g/cm2Compared with the existing loading range, the loading range is increased by 57.1%, so that the dry coating process is adopted, the loading range of the active substances is increased, the consistency of the loading capacity and the surface state of the active substances of the produced single-specification battery pole piece is effectively ensured, the production efficiency of the pole piece is improved by 37.5%, and the competitive advantage of an enterprise is enhanced.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Based on the problems of large consumption of auxiliary materials of the battery pole piece, low production efficiency and poor consistency in the prior art, the scheme designs the corresponding preparation method of the visco-elastic raw materials and the raw materials of the battery pole pieceA method and a pole piece preparation method, which ensure that the active material loading capacity of the battery pole piece reaches 0.1-0.7g/cm2And the production efficiency and the consistency of the pole pieces are improved. The scheme for manufacturing the visco-elastic raw material for producing the battery pole piece can greatly increase the carrying capacity of the pole piece, and the implementation scheme is as follows,
a viscoelastic raw material of a battery pole piece comprises the following substances,
lead powder with the mass ratio of 0.5-5 percent and indissolvable and slightly soluble salt of 60-89.5 percent of lead, wherein the indissolvable and slightly soluble salt is one or a mixture of more than two of lead oxide, lead sulfate, lead carbonate, lead phosphate, lead hydrogen phosphate and lead chromate;
the conductive agent accounts for 6-30% of the mass ratio, and is one or a mixture of more than two of active carbon, carbon black, carbon fiber, carbon foam, acetylene black, Keqin black, KS-6, SFG-6, SP, mesoporous carbon, carbon nano tubes, graphite and graphene;
0.2 to 5 percent of additive by mass, wherein the additive is one or a mixture of more than two of calcium sulfate, barium sulfate, calcium hydroxide, ferric hydroxide, magnesium hydroxide and the like;
3-15% of a binder in a mass ratio, wherein the binder is one or a mixture of polyethylene oxide, polypropylene oxide, polyacrylonitrile, polyimide, polyester, polytetrafluoroethylene, a fluorinated polymer, polydivinyl polyethylene glycol, polyethylene glycol diacrylate and polyethylene glycol dimethacrylate.
The above raw materials are prepared into viscoelastic raw materials by the following preparation method,
step 1, putting the raw materials of the battery pole pieces required to be prepared according to the proportion into a mixer for uniform mixing; setting the speed of the mixer to be 50-1000 rpm, and mixing for 2-30 min;
step 2, putting the uniformly mixed raw materials into a kneader, adding a solvent, and kneading into a mass; kneading the mixture for 10min to 60min at the speed of 10rpm to 50rpm of the kneader; the solvent is one or more of N-methyl pyrrolidone, acetone, ethanol, propanol, deionized water, isopropanol, etc.
And 3, kneading and adding a binder required by the anode and cathode materials to prepare the viscoelastic raw material. The solid content of the generated viscoelastic raw material is 40-80%, and the viscoelastic degree is 1000-5000 MPa.
The preparation method for manufacturing the battery pole piece by correspondingly adopting the viscoelastic raw material comprises the following steps:
step 1, preparing a viscoelastic raw material, wherein any one of the steps is adopted to prepare the viscoelastic raw material;
step 2, preparing the membrane, namely putting the viscoelastic raw material into an extruder for extrusion, and rolling and molding the electrode membrane by using a pre-roller after extrusion; the extrusion outlet of the extruder is selected to be a rectangle with the size of 50mm-300mm in length and 2mm-30mm in width. The thickness of the pre-roller roll-formed electrode diaphragm is 0.1mm-30mm, and the width is 50mm-500 mm.
And 3, coating and roll forming, wherein the prepared membrane pole piece is coated and roll formed to prepare the required battery pole piece.
The pole piece coating roll forming step specifically comprises:
A) the method comprises the following steps Putting the prepared membrane into a roll squeezer to carry out coating roll forming with a current collector; the current collector is in a roll shape, the width of the current collector is 120mm-500mm, and the thickness of the current collector is 0.1mm-0.5 mm. The rolling parameters were set as: the roller speed is 0.1m/min-6m/min, and the roller gap is set as follows: 0.5mm-3 mm.
B) The method comprises the following steps Dynamically baking the battery pole piece; the baking temperature is set to 60-200 ℃.
C) The method comprises the following steps Rolling and flattening the pole piece subjected to coating roll forming; the roller speed is 0.1m/min-6m/min, and the roller gap is set as follows: 0.5mm-3 mm.
D) The method comprises the following steps Carrying out punching molding on the flattened pole piece on a punching machine, wherein the size of the pole piece is as follows: 100mm-200mm long, 100mm-200mm wide and 0.5mm-3mm thick, and the loading capacity of the pole piece is 0.1g/cm2-0.7g/cm2。
The sticky elastic raw material is adopted in the scheme, the battery pole piece is produced, the consistency of the battery pole piece can be guaranteed, the using amount of auxiliary materials can be reduced, and the range of the loading capacity of active substances of the battery pole piece is increased. High production efficiency, good consistency, high quality and low cost.
Example 1
Specific embodiments, the following
(1) Preparing raw materials: weighing 5% of lead powder, 60% of lead sulfate, 30% of conductive agent active carbon, SP and 2% of barium sulfate additive raw materials, putting the raw materials into a high-speed mixer, and uniformly mixing, wherein the speed of the high-speed mixer is set to be 300rpm, and the mixing time is 6 min; putting the uniformly mixed raw materials into a kneader, adding a certain amount of deionized water, and kneading at the speed of 36rpm for 30 min; then adding a binder required by the anode and cathode materials, and 3% of polyethylene oxide by mass ratio, kneading for 10min at the speed of 18rpm to prepare a raw material with certain formability; the solid content is 60 percent, and the viscoelasticity is 3000 MPa;
(2) preparing a membrane: forming the raw material into a film with the width of 230mm and the thickness of 8mm by using an extruder device;
(3) preparing a pole piece: setting parameters of the coating machine: the first nip was 0.55mm, roll speed, 0.5m/min → second nip, 0.92mm, roll speed 0.4m/min, roll temperature 25 ℃, oven temperature 150 ℃ → third nip (Act).2nd-0.3) mm, i.e. 0.3mm smaller than the second nip, at a roll speed of 3.2 m/s; punching and molding the flattened pole piece on a punching machine, wherein the size of the pole piece is 120mm in length, 120mm in width and 1.1mm in thickness, and the carrying capacity of the pole piece is 0.14g/cm2。
Example 2
The raw material preparation and the membrane preparation are the same as S1; preparing a pole piece: setting parameters of the coating machine: the primary press roll gap is 0.72mm, the roll speed is 0.5m/min → the secondary press roll gap is 1.55mm, the roll speed is 0.4m/min, the roll temperature is 25 ℃, the oven temperature is 150 ℃ → the tertiary press roll gap is 1.29mm, and the roll speed is 3.2 m/s; punching and molding the flattened pole piece on a punching machine, wherein the size of the pole piece is 120mm in length, 120mm in width and 1.45mm in thickness, and the carrying capacity of the pole piece is 0.3g/cm2。
Example 3
The raw material preparation and the membrane preparation are the same as S1; preparing a pole piece: setting parameters of the coating machine: the primary nip roll gap is 0.9mm, the roll speed is 0.5m/min → the secondary nip roll gap is 2.5mm, the roll speed is 0.4m/min, the roll temperature is 25 ℃, the oven temperature is 150 ℃ → the tertiary nip roll gap is 1.7mm, and the roll speed is 3.2 m/s; the flattened pole piece is placed on a punching machinePunching to obtain pole piece with length 120mm, width 120mm and thickness 2.2mm, wherein the pole piece has a loading capacity of 0.6g/cm2。
Example 4
(1) Preparing raw materials: weighing raw materials of lead powder with the mass fraction of 0.5%, lead oxide with the mass fraction of 89.5%, conductive agent graphite with the mass fraction of 6% and calcium hydroxide additive with the mass fraction of 0.2%, and uniformly mixing the raw materials in a high-speed mixer, wherein the speed of the high-speed mixer is set to be 50rpm, and the mixing time is 30 min; putting the uniformly mixed raw materials into a kneader, adding a certain amount of N-methyl pyrrolidone, and kneading at the speed of 10rpm for 60 min; then adding a binder required by the anode and cathode materials, polyimide with the mass ratio of 3.8%, kneading for 20min at the speed of 25rpm to prepare a raw material with certain formability; the solid content is 40 percent, and the viscoelasticity is 1000 MPa;
(2) preparing a membrane: preparing the raw materials into a film with the width of 50mm and the thickness of 30mm by using an extruder device;
(3) preparing a pole piece: setting parameters of the coating machine: the primary nip was 0.5mm, the roll speed was 0.1m/min → the secondary nip was 1mm, the roll speed was 6m/min, the roll temperature was 25 ℃, the oven temperature was 200 ℃ → the tertiary nip (Act).2nd-0.3) mm, i.e. 0.3mm smaller than the second nip, at a roll speed of 3 m/s; punching and molding the flattened pole piece on a punching machine, wherein the size of the pole piece is 100mm in length, 100mm in width and 3mm in thickness, and the carrying capacity of the pole piece is 0.7g/cm2。
Example 5
(1) Preparing raw materials: weighing raw materials of lead powder with the mass fraction of 2 percent, lead hydrogen phosphate with the mass fraction of 70 percent, acetylene black serving as a conductive agent with the mass fraction of 8 percent and magnesium hydroxide additive with the mass fraction of 5 percent, and uniformly mixing the raw materials in a high-speed mixer, wherein the speed of the high-speed mixer is set to be 1000rpm, and the mixing time is 2 min; putting the uniformly mixed raw materials into a kneader, adding a certain amount of acetone, and kneading at the speed of 50rpm for 10 min; then adding a binder required by the anode and cathode materials, and a fluorinated polymer with the mass ratio of 15%, kneading for 10min at the speed of 45rpm to prepare a raw material with certain formability; the solid content is 80 percent, and the viscoelasticity is 5000 MPa;
(2) preparing a membrane: preparing the raw materials into a film with the width of 500mm and the thickness of 0.1mm by using an extruder device;
(3) preparing a pole piece: setting parameters of the coating machine: the primary nip was 3mm, the roll speed was 6m/min → the secondary nip was 0.8mm, the roll speed was 0.1m/min, the roll temperature was 25 ℃, the oven temperature was 200 ℃ → the tertiary nip (Act).2nd-0.3) mm, i.e. 0.3mm smaller than the second nip, at a roll speed of 0.1 m/s; punching and molding the flattened pole piece on a punching machine, wherein the size of the pole piece is 200mm in length, 200mm in width and 0.5mm in thickness, and the carrying capacity of the pole piece is 0.1g/cm2。
The invention and its embodiments have been described above schematically, without limitation, and the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Therefore, if a person skilled in the art receives the teachings of the present invention, without inventive design, a similar structure and an embodiment to the above technical solution should be covered by the protection scope of the present patent. Furthermore, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Several of the elements recited in the product claims may also be implemented by one element in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.

Claims (15)

1. The viscoelastic raw material of the battery pole piece is characterized in that: comprises the following materials which are prepared by the following steps,
lead powder with the mass ratio of 0.5-5 percent and indissolvable and slightly soluble salt of 60-89.5 percent of lead, wherein the indissolvable and slightly soluble salt is one or a mixture of more than two of lead sulfate, lead carbonate, lead phosphate, lead hydrogen phosphate and lead chromate;
the conductive agent accounts for 6-30% of the mass ratio, and is one or a mixture of more than two of activated carbon, carbon black, carbon fiber, mesoporous carbon, carbon nano tube, graphite and graphene;
0.2 to 5 percent of additive by mass, wherein the additive is one or a mixture of more than two of calcium sulfate, barium sulfate, calcium hydroxide, ferric hydroxide and magnesium hydroxide;
3-15% of binder, wherein the binder is one or a mixture of polyethylene oxide, polypropylene oxide, polyacrylonitrile, polyimide, polyester, fluorinated polymer, polydivinyl polyethylene glycol, polyethylene glycol diacrylate and polyethylene glycol dimethacrylate.
2. A preparation method of a viscoelastic raw material of a battery pole piece comprises the following steps,
step 1, based on the types and the proportions of the raw materials of the battery pole piece in the claim 1, putting the corresponding substances into a mixer for uniformly mixing;
step 2, putting the uniformly mixed raw materials into a kneader, adding a solvent, and kneading into a mass;
and 3, kneading and adding a binder required by the anode and cathode materials to prepare the viscoelastic raw material.
3. The preparation method of the viscoelastic raw material for the battery pole piece, according to claim 2, is characterized in that: in the step 1, the speed of the mixer is set to be 50rpm-1000rpm, and the mixing time is 2min-30 min.
4. The preparation method of the viscoelastic raw material for the battery pole piece, according to claim 2, is characterized in that: kneading the mixture in the kneader in the step 2 at a speed of 10rpm to 50rpm for 10min to 60 min.
5. The preparation method of the viscoelastic raw material for the battery pole piece, according to claim 2, is characterized in that: the solid content of the viscoelastic raw material generated in the step 3 is 40-80%, and the viscoelastic degree is 1000-5000 MPa.
6. The preparation method of the viscoelastic raw material for the battery pole piece according to claim 2, is characterized in that: and 2, the solvent is one or a mixture of N-methyl pyrrolidone, acetone, ethanol, propanol, deionized water and isopropanol.
7. A preparation method of a battery pole piece comprises the following steps:
step 1, preparing a viscoelastic material by the steps of claim 1 or 2 or 4 or 5 or 6;
step 2, preparing the membrane, namely putting the viscoelastic raw material into an extruder for extrusion, and rolling and molding the electrode membrane by using a pre-roller after extrusion;
and 3, coating and roll forming, wherein the prepared membrane pole piece is coated and roll formed to prepare the required battery pole piece.
8. The preparation method of the battery pole piece according to claim 7, characterized in that: in the step 2, the extrusion opening of the extruder is selected to be a rectangle with the size of 50mm-300mm in length and 2mm-30mm in width.
9. The preparation method of the battery pole piece according to claim 7, characterized in that: the thickness of the pre-roller roll-formed electrode diaphragm is 0.1mm-30mm, and the width is 50mm-500 mm.
10. The preparation method of the battery pole piece according to claim 7, characterized in that: the step 3 of pole piece coating roll forming specifically comprises the following steps:
A) the method comprises the following steps Putting the prepared membrane into a roll squeezer to carry out coating roll forming with a current collector;
B) the method comprises the following steps Baking the battery pole piece;
C) the method comprises the following steps Rolling and flattening the pole piece subjected to coating roll forming;
D) the method comprises the following steps Punching and molding the flattened pole piece on a punching machine, wherein the carrying capacity of the pole piece is 0.1g/cm2-0.7g/cm2。
11. The preparation method of the battery pole piece according to claim 10, characterized in that: and step A, the current collector is in a roll shape, the size is 120mm-500mm in width, and the thickness is 0.1mm-0.5 mm.
12. The preparation method of the battery pole piece according to claim 10, characterized in that: step A rolling parameters are set as follows: the roller speed is 0.1m/min-6m/min, and the roller gap is set as follows: 0.5mm-3 mm.
13. The preparation method of the battery pole piece according to claim 10, characterized in that: and the baking temperature of the step B is set to be 60-200 ℃.
14. The preparation method of the battery pole piece according to claim 10, characterized in that: step C, the roller speed is 0.1m/min-6m/min, and the roller gap is set as follows: 0.5mm-3 mm.
15. The preparation method of the battery pole piece according to claim 10, characterized in that: d, punching the pole piece by using a punching machine with the size as follows: 100mm-200mm long, 100mm-200mm wide and 0.5mm-3mm thick.
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