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Positive electrode of lithium-manganese button cell and preparation method of positive electrode

A button battery, lithium-manganese technology, applied in the field of electrochemistry, can solve the problems affecting wide application and low output performance of large current, and achieve the effect of smooth diffusion process, improved discharge capacity and enhanced activity

Inactive Publication Date: 2018-09-04
FUJIAN NANPING NANFU BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the existing lithium battery is that the battery capacity and high current output performance are low, which seriously affects its wide application

Method used

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  • Positive electrode of lithium-manganese button cell and preparation method of positive electrode
  • Positive electrode of lithium-manganese button cell and preparation method of positive electrode

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Effect test

preparation example Construction

[0025] A method for preparing a positive electrode of a lithium-manganese button cell, comprising the steps of:

[0026] S1: sintering electrolytic manganese dioxide in a sintering furnace at 350-440°C for 10-20h;

[0027] S2: fully mix the sintered manganese dioxide with graphite, acetylene black, and polytetrafluoroethylene;

[0028] S3: through dry mixing, wet mixing, tableting, granulation, tableting, drying and other processes to prepare positive electrode sheets.

[0029] The present invention adopts the above components, and according to the conventional lithium-manganese button battery positive electrode production process, through dry mixing, wet mixing, tableting, granulation, tableting, drying and other processes, the positive electrode sheet of lithium battery is prepared, and combined with the negative electrode lithium , The diaphragm is assembled into a CR2032 lithium manganese button cell.

[0030] During the experiment, the inventor unexpectedly found that t...

Embodiment 1

[0035] Example 1: Sinter electrolytic manganese dioxide in a sintering furnace at 375° C. for 12 hours, and mix the sintered manganese dioxide by manganese dioxide: graphite: acetylene black: polytetrafluoroethylene=92%: 4%: 2 The ratio of %: 2% is fully mixed, and prepared into a positive electrode sheet through dry mixing, wet mixing, tableting, granulation, tableting, drying, etc., with metal lithium as the negative electrode, the diaphragm is a glass fiber diaphragm, and 1mol / L high chlorine Lithium oxide (LiClO4) / propylene carbonate (PC) + ethylene glycol dimethyl ether (DME) (volume ratio 1:1) as the electrolyte, assembled into a CR2032 lithium battery in a dry room with a low dew point and -30 degrees.

Embodiment 2

[0036] Embodiment 2: Sinter electrolytic manganese dioxide in a sintering furnace at 405° C. for 16 h, and sinter the manganese dioxide by manganese dioxide: graphite: acetylene black: polytetrafluoroethylene=92%: 4%: 2 The ratio of %: 2% is fully mixed, and prepared into a positive electrode sheet through dry mixing, wet mixing, tableting, granulation, tableting, drying, etc., with metal lithium as the negative electrode, the diaphragm is a glass fiber diaphragm, and 1mol / L high chlorine Lithium oxide (LiClO4) / propylene carbonate (PC) + ethylene glycol dimethyl ether (DME) (volume ratio 1:1) as the electrolyte, assembled into a CR2032 lithium battery in a dry room with a low dew point and -30 degrees.

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Abstract

The invention discloses a positive electrode of a lithium-manganese button cell and a preparation method of the positive electrode. The positive electrode comprises the following positive active materials of manganese dioxide, graphite, acetylene black and polytetrafluoroethylene, wherein the manganese dioxide is subjected to high-temperature heat treatment, and alpha-MnO2 and gamma-MnO2 crystal structures contained in the manganese dioxide are transformed into a gamma-MnO2 and beta-MnO2 mixed crystal structure, so that the ratio of the beta-MnO2 crystal structure in the mixed crystal structure reaches 60-80%, the content of crystal water in the manganese dioxide is also correspondingly reduced, the activity of the manganese dioxide subjected to heat treatment is greatly strengthened and the capacity and the high-current discharge capacity of the cell are greatly improved.

Description

technical field [0001] The invention relates to a battery material preparation technology, in particular to a positive electrode of a lithium-manganese button battery and a preparation method thereof, belonging to the field of electrochemistry. Background technique [0002] Lithium-manganese dioxide button battery is a kind of energy storage battery developed in the 1970s. Because of its high specific energy, long life, small self-discharge, high cost performance, and no pollution, it has shown great promise in applications. Huge advantages have been widely used in calculators, electronic watches, car remote keys, communication devices, etc. With the development of electronic information technology, higher requirements are put forward for the performance of batteries in all aspects, especially the requirements for discharge capacity and power density of batteries are getting higher and higher. The disadvantage of the existing lithium battery is that the battery capacity and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/583H01M4/62H01M4/60H01M10/058C01B32/20
CPCC01B32/20H01M4/505H01M4/583H01M4/60H01M4/625H01M10/058Y02E60/10Y02P70/50
Inventor 常海涛余佑锋苏盛陈进添施继琴
Owner FUJIAN NANPING NANFU BATTERY
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