CN114220940A - Positive plate of lithium primary battery containing graphite worms and preparation method thereof - Google Patents

Positive plate of lithium primary battery containing graphite worms and preparation method thereof Download PDF

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CN114220940A
CN114220940A CN202111595590.3A CN202111595590A CN114220940A CN 114220940 A CN114220940 A CN 114220940A CN 202111595590 A CN202111595590 A CN 202111595590A CN 114220940 A CN114220940 A CN 114220940A
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parts
graphite
primary battery
slurry
stirring
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潘文硕
梁辉
何献文
郑立宏
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Huizhou Huiderui Lithium Bettery Technology Co ltd
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Huizhou Huiderui Lithium Bettery 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
    • H01M4/06—Electrodes for primary cells
    • 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
    • H01M4/06—Electrodes for primary cells
    • H01M4/08—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention belongs to the field of chemical batteries, and discloses a lithium primary battery positive plate containing graphite worms and a preparation method thereof, wherein the lithium primary battery positive plate comprises slurry coated on a lithium primary battery positive current collector, and the slurry comprises the following components in parts by weight: the material comprises, by weight, 100 parts of manganese dioxide serving as an active material, 1-10 parts of a conductive agent, 1-10 parts of a binder I, 1-10 parts of a binder II and 10-50 parts of deionized water, wherein the conductive agent is graphite worms. The graphite worms are prepared by instantaneous high-temperature heating of graphite after intercalation treatment, have larger specific surface area, and can form a conductive network after being dispersed by a proper process when being used as a conductive agent, thereby achieving the purpose of improving the conductivity of the positive electrode of the lithium primary battery; the graphite worm has the advantages of low price, easy obtainment of raw materials, simple manufacturing process and lower cost. The invention has the technical effects that: the lithium primary battery positive electrode has the advantages of less types of used conductive agents, simplified preparation process, lower manufacturing cost and good conductive performance.

Description

Positive plate of lithium primary battery containing graphite worms and preparation method thereof
Technical Field
The invention relates to the technical field of chemical batteries, in particular to a positive plate of a lithium primary battery containing graphite worms and a preparation method thereof.
Background
With the rapid development of portable electronic devices, lithium primary batteries (primary batteries using metal lithium or lithium alloy as a negative electrode material) are widely used in various fields such as industry, medicine, civil use, and military use due to their high specific energy, high specific power, and good storage properties. In the prior art, in order to improve the conductivity of the positive electrode of the lithium primary battery, a conductive agent is added, and the conductive agent mainly comprises conductive carbon black, conductive graphite and carbon fiber. The conductive carbon black and the conductive graphite have low cost but poor conductive effect and are generally required to be used in a composite way; carbon fibers have good conductive effects, but are expensive, which leads to increased manufacturing costs.
Chinese patent application CN110352524A discloses expanded graphite worm-protected metal fluoride and metal chloride cathode active materials for lithium batteries comprising a plurality of particles or coatings of the cathode active material (metal fluoride or metal chloride) and an expanded graphite worm layer consisting of interconnected graphite flakes and pores between the flakes, wherein (a) the graphite worms are selected from the group consisting of expanded natural graphite, expanded artificial graphite, expanded meso-carbon microspheres, expanded coke, expanded meso-pitch, expanded carbon or graphite fibers, or combinations thereof; (b) the cathode active material particles or coating have a size of from 0.4nm to 10 μm and are in an amount of from 1% to 99% by weight, based on the total weight of the combined graphite worms and cathode active material; and (c) some of the pores contain particles or a coating of the cathode active material. The graphite worms are used as cathodes of lithium batteries.
Disclosure of Invention
Aiming at the technical problem of the positive electrode conductive material of the lithium primary battery, the invention provides a positive electrode plate of the lithium primary battery containing graphite worms and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a lithium primary battery positive plate that contains graphite worm, is including coating the thick liquids on lithium primary battery anodal mass flow body, its characterized in that: the slurry comprises the following components in parts by weight: the material comprises, by weight, 100 parts of manganese dioxide serving as an active material, 1-10 parts of a conductive agent, 1-10 parts of a binder I, 1-10 parts of a binder II and 10-50 parts of deionized water, wherein the conductive agent is graphite worms.
Further: in the positive plate of the lithium primary battery containing the graphite worms, the density of the graphite worms is 0.03-0.10 g/cm 3; the specific surface area is 20-40 m 2/g. And 4-7 parts of preferred graphite worms. The addition amount of graphite worms is small, and the conductivity of the positive electrode is poor; the graphite worms are added in a large amount, the proportion of active substances (manganese dioxide) is reduced, and the discharge capacity of the battery is reduced.
The binder I is at least one of sodium carboxymethylcellulose, styrene-butadiene rubber and an aqueous dispersion of acrylonitrile multipolymer compound.
The binder II is polytetrafluoroethylene.
The invention also provides a method for preparing the positive plate of the lithium primary battery, which comprises the following steps:
uniformly mixing a binder I and deionized water;
adding manganese dioxide and graphite worms into the solution prepared in the step, and uniformly stirring and mixing;
adding the binder II into the mixture, and stirring and mixing the mixture to form slurry;
uniformly coating the slurry on a positive current collector of the primary lithium battery and drying;
and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry.
Adding graphite worms into the solution prepared in the step (1) in proportion, stirring at a high speed for 0.5-1.5 h, then adding manganese dioxide for 2-3 times, stirring at a high speed for 14-16 min after each addition, and finally mixing and stirring at a high speed for 1-2 h. The step two is with the dispersion speed of mixer 1000 ~ 3000 rpm/min.
The planetary stirrer is used for the stirrer. The viscosity of the slurry in the step (3) is 5000-. Through the process, the graphite worms can be uniformly dispersed in the slurry, and a conductive network is favorably formed.
Compared with the prior art, the positive plate of the lithium primary battery containing the graphite worms comprises slurry coated on a positive current collector of the lithium primary battery, and is characterized in that: the slurry comprises the following components in parts by weight: the material comprises, by weight, 100 parts of manganese dioxide serving as an active material, 1-10 parts of a conductive agent, 1-10 parts of a binder I, 1-10 parts of a binder II and 10-50 parts of deionized water, wherein the conductive agent is graphite worms. The graphite worms are prepared by instantaneous high-temperature heating of graphite after intercalation treatment, have larger specific surface area, and can form a conductive network after being dispersed by a proper process when being used as a conductive agent, thereby achieving the purpose of improving the conductivity of the positive electrode of the lithium primary battery; and the graphite worm raw material is low in price and easy to obtain, the manufacturing process is simple, and the cost is lower. Therefore, the technical effects of the invention are as follows: the lithium primary battery positive electrode has the advantages of less types of used conductive agents, simplified preparation process, lower manufacturing cost and good conductive performance.
Detailed Description
The main point of the invention is that the graphite worms with low price and easy availability as raw materials are used as conductive agents, and the graphite worms are prepared by instantaneous high-temperature heating of graphite after intercalation treatment, have larger specific surface area, and can form a conductive network after being dispersed by a proper process when being used as the conductive agents, thereby achieving the purpose of improving the conductivity of the positive electrode of the lithium primary battery. The present invention will be further described with reference to the following examples, which are not intended to limit the present invention, and the selection of the raw materials can be made according to the circumstances without substantially affecting the results.
Example 1
Adding 6 parts of an aqueous dispersion adhesive of an acrylonitrile multi-component copolymer compound into 30 parts of deionized water, and uniformly mixing to prepare a solution; adding 6 parts of graphite worms and 100 parts of manganese dioxide into the solution prepared in the step, and stirring and mixing uniformly; and thirdly, adding 4 parts of polytetrafluoroethylene binder into the sample prepared in the second step, and stirring and mixing to form the slurry. Uniformly coating the slurry on a positive current collector of the primary lithium battery and drying; and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry to manufacture the positive electrode sheet. The components in the steps are all in parts by weight. The density of the graphite worms is 0.03-0.10 g/cm3(ii) a The specific surface area is 20-40 m2(ii) in terms of/g. Adding graphite worms into the solution prepared in the step I in proportion, stirring at a high speed for 0.5-1.5 h, then adding manganese dioxide for 2-3 times,and (4) stirring at a high speed for 14-16 min after each addition, and finally mixing and stirring at a high speed for 1-2 h. The step two is with the dispersion speed of mixer 1000 ~ 3000 rpm/min. The planetary stirrer is used for the stirrer. The viscosity of the slurry in the step (3) is 5000-.
Example 2
Adding 8 parts of an aqueous dispersion adhesive of an acrylonitrile multi-component copolymer compound into 30 parts of deionized water, and uniformly mixing to prepare a solution; adding 4 parts of graphite worms and 100 parts of manganese dioxide into the solution prepared in the step, and stirring and mixing uniformly; and adding 3 parts of polytetrafluoroethylene binder into the sample prepared in the step II, and stirring and mixing to form the slurry. Uniformly coating the slurry on a positive current collector of the primary lithium battery and drying; and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry to manufacture the positive electrode sheet. The components in the steps are all in parts by weight. The density of the graphite worms is 0.03-0.10 g/cm3(ii) a The specific surface area is 20-40 m2(ii) in terms of/g. Adding graphite worms into the solution prepared in the step (1) in proportion, stirring at a high speed for 0.5-1.5 h, then adding manganese dioxide 2-3 times, stirring at a high speed for 14-16 min after each addition, and finally mixing and stirring at a high speed for 1-2 h. The step two is that the dispersion speed of the stirrer is 1000-3000 rpm/min. The planetary stirrer is used for the stirrer. The viscosity of the slurry in the step (3) is 5000-.
Example 3
The method comprises the steps of adding 1 part of sodium carboxymethyl cellulose binder into 40 parts of deionized water, uniformly mixing, and adding 0.2 part of styrene butadiene rubber binder to prepare a solution; adding 7 parts of graphite worms and 100 parts of manganese dioxide into the solution prepared in the step, and stirring and mixing uniformly; and adding 3 parts of polytetrafluoroethylene binder into the sample prepared in the step II, and stirring and mixing to form the slurry. Uniformly coating the slurry on a positive current collector of the primary lithium battery and drying; and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry to manufacture the positive electrode sheet. The components in the steps are all in parts by weight. The density of the graphite worms is 0.03-0.10 g/cm3(ii) a The specific surface area is 20-40 m2(ii) in terms of/g. Adding stones into the solution prepared in the step of the first step in proportionAnd (3) stirring the black worms at a high speed for 0.5-1.5 h, then adding manganese dioxide for 2-3 times, stirring at a high speed for 14-16 min after each addition, and finally mixing and stirring at a high speed for 1-2 h. The step two is with the dispersion speed of mixer 1000 ~ 3000 rpm/min. The planetary stirrer is used for the stirrer. The viscosity of the slurry in the step (3) is 5000-.
Example 4
Adding 5 parts of an aqueous dispersion adhesive of an acrylonitrile multi-component copolymer compound into 25 parts of deionized water, and uniformly mixing to prepare a solution; adding 4 parts of graphite worms and 100 parts of manganese dioxide into the solution prepared in the step, and stirring and mixing uniformly; and adding 3 parts of polytetrafluoroethylene binder into the sample prepared in the step II, and stirring and mixing to form the slurry. Uniformly coating the slurry on a positive current collector of the primary lithium battery and drying; and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry to manufacture the positive electrode sheet. The components in the steps are all in parts by weight. The density of the graphite worms is 0.03-0.10 g/cm3(ii) a The specific surface area is 20-40 m2(ii) in terms of/g. Adding graphite worms into the solution prepared in the step (1) in proportion, stirring at a high speed for 0.5-1.5 h, then adding manganese dioxide 2-3 times, stirring at a high speed for 14-16 min after each addition, and finally mixing and stirring at a high speed for 1-2 h. The step two is that the dispersion speed of the stirrer is 1000-3000 rpm/min. The planetary stirrer is used for the stirrer. The viscosity of the slurry in the step (3) is 5000-.
Example 5
Adding 7 parts of an aqueous dispersion adhesive of an acrylonitrile multi-component copolymer compound into 25 parts of deionized water, and uniformly mixing to prepare a solution; adding 4 parts of graphite worms and 100 parts of manganese dioxide into the solution prepared in the step, and stirring and mixing uniformly; and thirdly, adding 4 parts of polytetrafluoroethylene binder into the sample prepared in the second step, and stirring and mixing to form the slurry. Uniformly coating the slurry on a positive current collector of the primary lithium battery and drying; and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry to manufacture the positive electrode sheet. The components in the steps are all in parts by weight. The density of the graphite worms is 0.03-0.10 g/cm3(ii) a The specific surface area is 20-40m 2/g. Adding graphite worms into the solution prepared in the step (1) in proportion, stirring at a high speed for 0.5-1.5 h, then adding manganese dioxide 2-3 times, stirring at a high speed for 14-16 min after each addition, and finally mixing and stirring at a high speed for 1-2 h. The step two is that the dispersion speed of the stirrer is 1000-3000 rpm/min. The planetary stirrer is used for the stirrer. The viscosity of the slurry in the step (3) is 5000-.
Example 6
Adding 0.8 part of sodium carboxymethylcellulose binder into 35 parts of deionized water, uniformly mixing, and adding 0.4 part of styrene butadiene rubber binder to prepare a solution; adding 8 parts of graphite worms and 100 parts of manganese dioxide into the solution prepared in the step, and stirring and mixing uniformly; and thirdly, adding 4 parts of polytetrafluoroethylene binder into the sample prepared in the second step, and stirring and mixing to form the slurry. Uniformly coating the slurry on a positive current collector of the primary lithium battery and drying; and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry to manufacture the positive electrode sheet. The components in the steps are all in parts by weight. The density of the graphite worms is 0.03-0.10 g/cm3(ii) a The specific surface area is 20-40 m2(ii) in terms of/g. Adding graphite worms into the solution prepared in the step (1) in proportion, stirring at a high speed for 0.5-1.5 h, then adding manganese dioxide for 2-3 times, stirring at a high speed for 14-16 min after each addition, and finally mixing and stirring at a high speed for 1-2 h. The step two is that the dispersion speed of the stirrer is 1000-3000 rpm/min. The planetary stirrer is used for the stirrer. The viscosity of the slurry in the step (3) is 5000-.
Example 7
The method comprises the steps of adding 0.7 part of sodium carboxymethyl cellulose binder into 40 parts of deionized water, uniformly mixing, and adding 0.3 part of styrene butadiene rubber binder to prepare a solution; adding 5 parts of graphite worms and 100 parts of manganese dioxide into the solution prepared in the step, and stirring and mixing uniformly; and thirdly, adding 4 parts of polytetrafluoroethylene binder into the sample prepared in the second step, and stirring and mixing to form the slurry. Uniformly coating the slurry on a positive current collector of the primary lithium battery and drying; and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry to manufacture the positive electrode sheet. The components in the steps are in parts by weight. The density of the graphite worms is 0.03-0.10 g/cm3(ii) a The specific surface area is 20-40 m2(ii) in terms of/g. Adding graphite worms into the solution prepared in the step (1) in proportion, stirring at a high speed for 0.5-1.5 h, then adding manganese dioxide for 2-3 times, stirring at a high speed for 14-16 min after each addition, and finally mixing and stirring at a high speed for 1-2 h. The step two is that the dispersion speed of the stirrer is 1000-3000 rpm/min. The planetary stirrer is used for the stirrer. The viscosity of the slurry in the step (3) is 5000-.
Example 8
Adding 6 parts of an aqueous dispersion adhesive of an acrylonitrile multi-component copolymer compound into 25 parts of deionized water, and uniformly mixing to prepare a solution; adding 7 parts of graphite worms and 100 parts of manganese dioxide into the solution prepared in the step, and stirring and mixing uniformly; and adding 5 parts of polytetrafluoroethylene binder into the sample prepared in the step II, and stirring and mixing to form the slurry. Uniformly coating the slurry on a positive current collector of the primary lithium battery and drying; and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry to manufacture the positive electrode sheet. The components in the steps are all in parts by weight. The density of the graphite worms is 0.03-0.10 g/cm3(ii) a The specific surface area is 20-40 m2(ii) in terms of/g. Adding graphite worms into the solution prepared in the step (1) in proportion, stirring at a high speed for 0.5-1.5 h, then adding manganese dioxide 2-3 times, stirring at a high speed for 14-16 min after each addition, and finally mixing and stirring at a high speed for 1-2 h. The step two is that the dispersion speed of the stirrer is 1000-3000 rpm/min. The planetary stirrer is used for the stirrer. The viscosity of the slurry in the step (3) is 5000-.
Example 9
The method comprises the steps of adding 2 parts of sodium carboxymethyl cellulose binder into 35 parts of deionized water, uniformly mixing, and adding 1 part of styrene butadiene rubber to prepare a binder solution; adding 6 parts of graphite worms and 100 parts of manganese dioxide into the solution prepared in the step, and stirring and mixing uniformly; and adding 3 parts of polytetrafluoroethylene binder into the sample prepared in the step II, and stirring and mixing to form the slurry. Uniformly coating the slurry on a positive current collector of the primary lithium battery and drying; fifthly, coating the dried positive electrode current collector warp with the slurryRolling and cutting into positive plate. The components in the steps are all in parts by weight. The density of the graphite worms is 0.03-0.10 g/cm3(ii) a The specific surface area is 20-40 m2(ii) in terms of/g. Adding graphite worms into the solution prepared in the step (1) in proportion, stirring at a high speed for 0.5-1.5 h, then adding manganese dioxide for 2-3 times, stirring at a high speed for 14-16 min after each addition, and finally mixing and stirring at a high speed for 1-2 h. The step two is that the dispersion speed of the stirrer is 1000-3000 rpm/min. The planetary stirrer is used for the stirrer. The viscosity of the slurry in the step (3) is 5000-.
Example 10
Adding 5 parts of an aqueous dispersion adhesive of an acrylonitrile multi-component copolymer compound into 25 parts of deionized water, and uniformly mixing to prepare a solution; adding 4 parts of graphite worms and 100 parts of manganese dioxide into the solution prepared in the step, and stirring and mixing uniformly; and thirdly, adding 6 parts of polytetrafluoroethylene binder into the sample prepared in the second step, and stirring and mixing to form the slurry. Uniformly coating the slurry on a positive current collector of the primary lithium battery and drying; and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry to manufacture the positive electrode sheet. The components in the steps are all in parts by weight. The density of the graphite worms is 0.03-0.10 g/cm3(ii) a The specific surface area is 20-40 m2(ii) in terms of/g. Adding graphite worms into the solution prepared in the step (1) in proportion, stirring at a high speed for 0.5-1.5 h, then adding manganese dioxide 2-3 times, stirring at a high speed for 14-16 min after each addition, and finally mixing and stirring at a high speed for 1-2 h. The step two is that the dispersion speed of the stirrer is 1000-3000 rpm/min. The planetary stirrer is used for the stirrer. The viscosity of the slurry in the step (3) is 5000-.
Comparative example 1
Adding 6 parts of an aqueous dispersion adhesive of an acrylonitrile multi-component copolymer compound into 30 parts of deionized water, and uniformly mixing to prepare a solution; adding 4 parts of acetylene black, 2 parts of graphite and 100 parts of manganese dioxide into the solution prepared in the step, and uniformly stirring and mixing; and thirdly, adding 4 parts of polytetrafluoroethylene binder into the sample prepared in the second step, and stirring and mixing to form the slurry. Uniformly coating the slurry on a positive current collector of the primary lithium battery and drying; and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry to manufacture the positive electrode sheet. The components in the steps are all in parts by weight.
Comparative example 2
Adding 0.6 part of sodium carboxymethyl cellulose into 40 parts of deionized water, uniformly mixing, and then adding 0.2 part of styrene butadiene rubber to prepare a solution; adding 3 parts of acetylene black, 4 parts of graphite and 100 parts of manganese dioxide into the solution prepared in the step, and stirring and mixing uniformly; and adding 3 parts of polytetrafluoroethylene binder into the sample prepared in the step II, and stirring and mixing to form the slurry. Uniformly coating the slurry on a positive current collector of the primary lithium battery and drying; and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry to manufacture the positive electrode sheet. The components in the steps are all in parts by weight.
Comparative example 3
Adding 6 parts of an aqueous dispersion adhesive of an acrylonitrile multi-component copolymer compound into 25 parts of deionized water, and uniformly mixing to prepare a solution; adding 12 parts of graphite worms and 100 parts of manganese dioxide into the solution prepared in the step, and stirring and mixing uniformly; and adding 5 parts of polytetrafluoroethylene binder into the sample prepared in the step II, and stirring and mixing to form the slurry. Uniformly coating the slurry on a positive current collector of the primary lithium battery and drying; and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry to manufacture the positive electrode sheet. The components in the steps are all in parts by weight.
The positive plates obtained in the above examples 1 to 10 and comparative examples 1 to 3 were used to finally prepare a lithium manganese CR123A battery, which includes a case with an open end, a lithium battery core disposed in the case, and a cap assembly fitted into the open end of the case; the lithium battery core is formed by winding a positive plate, a negative plate and a diaphragm together, wherein the positive plate and the negative plate are provided with tabs for leading out electrodes. Electrolyte is filled in the shell; the preparation method of the lithium manganese CR123A battery comprises the following steps: electric core coiling, lithium cell core go into shell and rolling slot, laser welding block, roll over the lid, pour into electrolyte into, annotate and roll over lid, gland, battery and seal, mound and seal after the liquid, annotate and roll over the lid after the liquid and refer to and carry the block with U type anchor clamps, push it to the shell opposite side, the shell side is equipped with limiting die, guarantees that the block after rolling over the lid is located the shell oral area, and is parallel with the shell oral area, and utmost point ear bends and stacks simultaneously. The pier sealing process refers to pressing the cover group downwards to reduce the beam waist width, and the laser welding of the cover cap refers to the welding connection of the lug and the cover cap. The positive electrode sheets obtained in examples 1 to 10 and comparative examples 1 to 3 were finally used to prepare lithium manganese CR123A batteries for discharge test, and the test results were obtained
As shown in the following list:
Figure BDA0003430423340000071
Figure BDA0003430423340000081
as can be seen from the table, the conductive effect of the common conductive agent (composite use) can be achieved by using the present invention as in examples 1 to 10, and the manufacturing cost is low. Comparative example 3 the discharge performance was inferior to that of the examples, since the discharge performance was lowered due to the decrease of the ratio of the active material (manganese dioxide) caused by the excessive amount of the graphite worms added.
The above-mentioned embodiments are merely illustrative of the present invention, which is not limited to any specific form disclosed, and modifications, equivalents and other applications of the technical solutions of the present invention should be considered as the protection scope of the present invention.

Claims (10)

1. The utility model provides a lithium primary battery positive plate that contains graphite worm, is including coating the thick liquids on lithium primary battery anodal mass flow body, its characterized in that: the slurry comprises the following components in parts by weight: the material comprises, by weight, 100 parts of manganese dioxide serving as an active material, 1-10 parts of a conductive agent, 1-10 parts of a binder I, 1-10 parts of a binder II and 10-50 parts of deionized water, wherein the conductive agent is graphite worms.
2. The composition of claim 1The positive plate of the lithium primary battery of the graphite worm is characterized in that: the density of the graphite worms is 0.03-0.10 g/cm3(ii) a The specific surface area is 20-40 m2/g。
3. The positive electrode sheet for a graphite-worm-containing lithium primary battery according to claim 1, characterized in that: 4-7 parts of graphite worms.
4. The positive electrode sheet for a graphite-worm-containing lithium primary battery according to claim 1, characterized in that: the binder I is at least one of sodium carboxymethylcellulose, styrene-butadiene rubber and an aqueous dispersion of acrylonitrile multipolymer compound.
5. The positive electrode sheet for a graphite-worm-containing lithium primary battery according to claim 1, characterized in that: the binder II is polytetrafluoroethylene.
6. A method for preparing a positive plate of a lithium primary battery according to any one of claims 1 to 5, comprising the steps of:
uniformly mixing a binder I and deionized water;
adding manganese dioxide and graphite worms into the solution prepared in the step, and uniformly stirring and mixing;
adding the binder II into the mixture, and stirring and mixing the mixture to form slurry;
uniformly coating the slurry on a positive current collector of the primary lithium battery and drying;
and fifthly, rolling and slitting the dried positive electrode current collector coated with the slurry.
7. The method of claim 6, wherein: adding graphite worms into the solution prepared in the step (1) in proportion, stirring at a high speed for 0.5-1.5 h, then adding manganese dioxide for 2-3 times, stirring at a high speed for 14-16 min after each addition, and finally mixing and stirring at a high speed for 1-2 h.
8. The method of claim 7, wherein: the step two is with the dispersion speed of mixer 1000 ~ 3000 rpm/min.
9. The method of claim 7, wherein: the planetary stirrer is used for the stirrer.
10. The method of claim 6, wherein: the viscosity of the slurry in the step (3) is 5000-.
CN202111595590.3A 2021-12-23 2021-12-23 Positive plate of lithium primary battery containing graphite worms and preparation method thereof Pending CN114220940A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1537339A (en) * 2001-10-08 2004-10-13 �����ɷ� Electrochemical cell
CN107611407A (en) * 2017-09-21 2018-01-19 江门市宏力能源有限公司 A kind of positive pole of lithium manganese battery formula and preparation method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1537339A (en) * 2001-10-08 2004-10-13 �����ɷ� Electrochemical cell
CN107611407A (en) * 2017-09-21 2018-01-19 江门市宏力能源有限公司 A kind of positive pole of lithium manganese battery formula and preparation method

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