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Positive pole piece for high-power lithium-manganese dioxide battery and preparation method of positive pole piece

A positive pole piece, manganese dioxide technology, applied in the direction of electrode manufacturing, battery electrodes, electrode heat treatment, etc., can solve the problems of inability to apply high current pulse discharge, poor mass transfer characteristics of lithium ions, and affect voltage output, etc., to achieve excellent High-current discharge performance, reducing particle agglomeration, and improving adhesion

Inactive Publication Date: 2020-10-13
SICHUAN PANOVASIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Conventional button-type lithium-manganese dioxide batteries mostly adopt the method of pressing or pasting to prepare the positive pole piece. The sheet is too thick, the porosity is too low, the ohmic polarization is large, and the mass transfer characteristics of lithium ions are not good, which leads to an increase in the battery voltage drop during high-current discharge, which affects the voltage output, and cannot be applied to the scene of high-current pulse discharge.

Method used

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  • Positive pole piece for high-power lithium-manganese dioxide battery and preparation method of positive pole piece

Examples

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Embodiment 1

[0036] A preparation method for a lithium-manganese dioxide battery positive electrode sheet, said method comprising the following steps:

[0037] Mix and grind 80% electrolytic manganese dioxide, 5% graphite, 5% conductive carbon black, and 10% polyvinylidene fluoride, and dry for 2 hours; add N-methylpyrrolidone to the mixed powder, and mix thoroughly to prepare a positive electrode slurry The solid content of the slurry is 36%; the positive electrode slurry is coated on a coating machine and vacuum-dried at 110° C. for 12 hours; the dried electrode sheet is rolled into a 110 μm thick electrode sheet with a roller press to obtain Lithium-manganese dioxide battery positive pole piece;

Embodiment 2

[0039] A preparation method for a lithium-manganese dioxide battery positive electrode sheet, said method comprising the following steps:

[0040] Mix and grind 80% electrolytic manganese dioxide, 5% graphite, 5% conductive carbon black, and 10% polyvinylidene fluoride, and dry for 2 hours; add N-methylpyrrolidone to the mixed powder, and mix thoroughly to prepare a positive electrode slurry The solid content of the slurry is 40%; the positive electrode slurry is coated on a coating machine and vacuum-dried at 110° C. for 12 hours; the dried electrode sheet is rolled into a 150 μm thick electrode sheet with a roller press to obtain Lithium-manganese dioxide battery positive pole piece;

Embodiment 3

[0042] A preparation method for a lithium-manganese dioxide battery positive electrode sheet, said method comprising the following steps:

[0043] Mix and grind 80% electrolytic manganese dioxide, 5% graphite, 5% conductive carbon black, and 10% polyvinylidene fluoride, and dry for 2 hours; add N-methylpyrrolidone to the mixed powder, and mix thoroughly to prepare a positive electrode slurry The solid content of the slurry is 40%; the positive electrode slurry is coated on a coating machine and dried in vacuum at 120°C for 12 hours; the dried pole piece is rolled into a pole piece with a thickness of 190 μm by a roller press to obtain Lithium-manganese dioxide battery positive pole piece;

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Abstract

The invention discloses a positive pole piece for a high-power lithium-manganese dioxide battery and a preparation method of the positive pole piece. The method comprises the following steps: performing heat treatment on electrolytic manganese dioxide serving as an active substance, mixing the electrolytic manganese dioxide with a conductive agent and a binder, performing grinding, heating and drying, adding N-methyl pyrrolidone, and stirring and mixing to obtain a positive pole mixture; and uniformly coating the surface of a current collector with the positive electrode mixture by using a coating machine, drying, and pressing to 0.1-0.3 mm by using a roller press to obtain the positive electrode piece for the high-power lithium-manganese dioxide battery. The method is simple in process, the capacity characteristic and the large-current pulse discharge performance of the lithium-manganese dioxide battery can be greatly improved by controlling the thickness and the porosity of the electrode, and the requirements of the high-power-manganese dioxide battery are met.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a positive pole piece for a high-power lithium-manganese dioxide battery and a preparation method thereof. Background technique [0002] Lithium-manganese dioxide battery belongs to lithium primary battery. It is prepared by using metal lithium as negative electrode, solid salt or salt dissolved in organic solvent as electrolyte, and electrolytic manganese dioxide after heat treatment as positive electrode. It has a wide range of applications, mainly used for electronic calculators, radios, flashlights, electric toys, watches and survival equipment, smart water and electricity meters, positioning transmitters and power supplies for instrument memory devices. [0003] With the gradual popularization of IoT technology, the demand for batteries matching IoT chips or terminals is also increasing. Different from traditional electrical appliances, IoT devices are mostly used...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/131H01M4/1391H01M4/1395H01M4/04
CPCH01M4/0402H01M4/043H01M4/0471H01M4/131H01M4/134H01M4/1391H01M4/1395Y02E60/10
Inventor 王铭高剑谭铁宁
Owner SICHUAN PANOVASIC TECH