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CN-121983525-A - High-ion-conductivity lithium manganese button cell positive electrode material and preparation method and application thereof

CN121983525ACN 121983525 ACN121983525 ACN 121983525ACN-121983525-A

Abstract

The invention provides a lithium manganese button cell anode material with high ion conductivity, a preparation method and application thereof. The method comprises the steps of (1) ageing manganese dioxide serving as an anode active material, (2) preparing dry powder, (3) preparing binder slurry, (4) adding the binder slurry obtained in the step (3) into the dry powder obtained in the step (2) to stir, pouring out powder, and (5) adding the powder obtained in the step (4) into a roller rubber mixing mill to mix, crushing and sieving to obtain the anode material. XRD diffraction analysis of the positive electrode material shows that the manganese dioxide crystal form of the powder is beta-manganese dioxide. The secondary particles of the powder were found to be rod-shaped by SEM electron microscopy. The process has the advantages that the liquid absorption rate and the ion conduction capacity of the prepared anode powder cake are improved by doping the carbon nano tube, and the product performance is improved.

Inventors

  • YE MINHUA
  • YE JIAHUI

Assignees

  • 松栢投资有限公司
  • 松柏(广东)电池工业有限公司

Dates

Publication Date
20260505
Application Date
20250916

Claims (10)

  1. 1. The preparation method of the lithium manganese button cell positive electrode material with high ion conduction capacity is characterized by comprising the following steps: (1) Aging the manganese dioxide serving as the positive electrode active material, namely putting the manganese dioxide into a baking furnace, baking at 375-420 ℃ for 10-15 hours, taking out, and cooling to room temperature; (2) Preparing dry powder, namely mixing manganese dioxide obtained in the step (1), acetylene black, graphite conductive material and carbon nano tube powder, and adding the mixture into a stirrer for stirring to obtain dry powder; (3) Preparing adhesive slurry, namely mixing polytetrafluoroethylene emulsion and carbon nano tube slurry, and stirring until the mixture is uniform to obtain adhesive slurry; (4) Adding the binder slurry obtained in the step (3) into the dry powder obtained in the step (2) to stir, and pouring out the powder; (5) And (3) adding the powder obtained in the step (4) into a roller rubber mixing mill, crushing, and sieving to obtain the positive electrode material.
  2. 2. The method of claim 1, wherein the temperature of the oven in step (1) is 380 ℃ and the time of the oven is 12 hours.
  3. 3. The method of claim 1, wherein the weight ratio of manganese dioxide, acetylene black, graphite conductive material and carbon nanotube powder in step (2) is 68.8-103.2:2.4-3.6:4-6:0.4-0.6, preferably the weight ratio of manganese dioxide, acetylene black, graphite conductive material and carbon nanotube powder in step (2) is 86:3:5:0.5.
  4. 4. The method according to claim 1, wherein the stirring conditions in the step (2) are set to a high stirring blade speed of 500-1000 rpm, a high stirring blade speed of 2500-3500 rpm, and stirring for 5-30 min, and preferably the stirring conditions in the step (2) are set to a high stirring blade speed of 800 rpm, a high stirring blade speed of 3000 rpm, and stirring for 20min.
  5. 5. The method according to claim 1, wherein the polytetrafluoroethylene emulsion/carbon nanotube slurry weight ratio in the step (3) is 3:1, preferably the tetrafluoroethylene emulsion has a solid content of 60% -65%, the carbon nanotube slurry is a carbon nanotube aqueous slurry, the carbon nanotube aqueous slurry has a carbon nanotube weight ratio of 4% -6%, more preferably the tetrafluoroethylene emulsion has a solid content of 60%, and the carbon nanotube aqueous slurry has a carbon nanotube weight ratio of 5%.
  6. 6. The method of claim 1, wherein the weight ratio of the dry powder to the binder slurry in step (4) is 93-96:5-7, and preferably the weight ratio of the dry powder to the binder slurry in step (4) is 94.5:6.
  7. 7. The preparation method of the rubber composition according to claim 1, wherein the stirring in the step (4) is carried out for 50min according to the rotating speed set in the step (2), the temperature of the roller in the step (5) is set to 300 ℃, the rubber mixing times are 5-6, and the mesh passing number is 30-80 mesh.
  8. 8. A positive electrode material prepared by the preparation method according to any one of claims 1 to 7.
  9. 9. A lithium manganese button cell is characterized in that, the lithium manganese button cell comprising the positive electrode material of claim 8.
  10. 10. Use of the positive electrode material according to claim 8 for the preparation of lithium manganese button cells.

Description

High-ion-conductivity lithium manganese button cell positive electrode material and preparation method and application thereof Technical Field The invention relates to a high-ion-conductivity lithium manganese button cell anode material, a preparation method and application thereof. Background With the development of technology and the progress of society, the variety and number of electronic products in daily contact with people are greatly increased. The operation of the electronic product is not separated from the battery, and the button-type primary lithium-manganese battery is widely applied to the medical field and the remote control technical field. And as the demand of people increases, higher requirements are put on the performance of the primary lithium-manganese battery. The conventional button-type primary lithium-manganese battery cannot well meet the current consumer demand for high-pulse, high-current and high-capacity button-type primary lithium-manganese batteries. Therefore, the high-pulse button-type primary lithium-manganese battery has extremely broad market prospect in the aspects of remote control equipment, flash lamps and the like. Based on the current situation, the invention provides a preparation process and a method of powder of a positive electrode powder cake of a button-type primary lithium-manganese battery with more excellent performance. Disclosure of Invention The invention aims to provide a preparation method of a lithium-manganese button cell positive electrode material with high ion conductivity, which is powder with stronger ion conductivity and is more suitable for manufacturing a positive electrode powder cake of a high-pulse cell, thereby being beneficial to manufacturing a button primary lithium-manganese cell with power discharge characteristics, a stable discharge platform and higher capacity, and meeting the current requirements of the button primary lithium-manganese cell with high pulse, high current and high capacity. In order to achieve the purpose, the adopted technical scheme is that the preparation method of the lithium manganese button cell anode material with high ion conduction capacity comprises the following steps: (1) Aging the manganese dioxide serving as the positive electrode active material, namely putting the manganese dioxide into a baking furnace, baking at 375-420 ℃ for 10-15 hours, taking out, and cooling to room temperature; (2) Preparing dry powder, namely mixing manganese dioxide obtained in the step (1), acetylene black, graphite conductive material and carbon nano tube powder, and adding the mixture into a stirrer for stirring to obtain dry powder; (3) Preparing adhesive slurry, namely mixing polytetrafluoroethylene emulsion and carbon nano tube slurry, and stirring until the mixture is uniform to obtain adhesive slurry; (4) Adding the binder slurry obtained in the step (3) into the dry powder obtained in the step (2) to stir, and pouring out the powder; (5) And (3) adding the powder obtained in the step (4) into a roller rubber mixing mill, crushing, and sieving to obtain the positive electrode material. Preferably, the temperature of the baking oven in the step (1) is 380 ℃ and the baking time is 12 hours. Preferably, the weight ratio of manganese dioxide, acetylene black, graphite conductive material and carbon nanotube powder in the step (2) is 68.8-103.2:2.4-3.6:4-6:0.4-0.6, and more preferably, the weight ratio of manganese dioxide, acetylene black, graphite conductive material and carbon nanotube powder in the step (2) is 86:3:5:0.5. Preferably, the stirring condition in the step (2) is set to be that the speed of the large stirring blade is set to be 500-1000 revolutions per minute, the speed of the high-speed stirring blade is set to be 2500-3500 revolutions per minute, and then stirring is carried out for 5-30 minutes, and more preferably, the stirring condition in the step (2) is set to be that the speed of the large stirring blade is set to be 800 revolutions per minute, the speed of the high-speed stirring blade is set to be 3000 revolutions per minute, and then stirring is carried out for 20 minutes. Preferably, the weight ratio of polytetrafluoroethylene emulsion to carbon nano tube slurry in the step (3) is 3:1. Preferably, the tetrafluoroethylene emulsion contains 60% -65% of solid matter, the carbon nanotube slurry is carbon nanotube aqueous slurry, and the weight percentage of carbon nanotubes in the carbon nanotube aqueous slurry is 4% -6%. More preferably, the tetrafluoroethylene emulsion has a solid content of 60%, and the carbon nanotube aqueous slurry has a weight percentage of 5%. Preferably, the weight ratio of the dry powder to the binder slurry in the step (4) is 93-96:5-7. More preferably, the weight ratio of the dry powder to the binder slurry in step (4) is 94.5:6. Preferably, in the step (4), stirring is performed at the rotation speed set in the step (2) for 50min. Preferably, in the step (5), the roll