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Ferrous disulfide/carbon composite cathode material of primary lithium battery and preparation method and application thereof

A technology of iron disulfide and positive electrode materials, which is applied in the direction of battery electrodes, secondary batteries, electrochemical generators, etc., and can solve the problems of low conductivity of iron disulfide materials, poor high-current discharge characteristics, and low battery discharge efficiency, etc. Problems, achieve good high current discharge characteristics, increase the effective specific surface area, and improve the effect of electronic conductivity

Inactive Publication Date: 2011-08-17
ZHONGYIN NINGBO BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium-iron disulfide battery positive electrode materials are generally directly obtained from natural pyrite after impurity removal and crushing. The obtained iron disulfide material has low conductivity and relatively low effective specific surface area, and the resulting battery has low discharge efficiency. High, high current discharge characteristics are not good

Method used

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  • Ferrous disulfide/carbon composite cathode material of primary lithium battery and preparation method and application thereof
  • Ferrous disulfide/carbon composite cathode material of primary lithium battery and preparation method and application thereof
  • Ferrous disulfide/carbon composite cathode material of primary lithium battery and preparation method and application thereof

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Embodiment 1

[0023] Embodiment 1: iron disulfide / carbon composite positive electrode material for a primary lithium battery, in which the iron disulfide / carbon composite positive electrode material contains 55% by mass of iron disulfide and 45% by mass of carbon element.

[0024] The preparation method of iron disulfide / carbon composite positive electrode material for primary lithium battery has the following steps:

[0025] (1) Mix carbon black (abbreviated as CB) or acetylene black with water at a mass ratio of 1:20 to obtain a suspension; ultrasonically disperse the obtained suspension with an ultrasonic power of 800 watts and keep After 5 hours, add pyrite to the suspension, wherein the mass ratio of pyrite to carbon black or acetylene black is 60:40, and after stirring for 8 hours, a mixed paste is obtained; the carbon source material can also be carbon A mixture of black and acetylene black.

[0026] (2) Heat the mixed paste obtained in step (1) to 90°C under the protection of nitro...

Embodiment 2

[0030] Embodiment 2: Iron disulfide / carbon composite positive electrode material for a primary lithium battery. The iron disulfide / carbon composite positive electrode material contains 80% by mass of iron disulfide and 20% by mass of carbon element.

[0031] The preparation method of iron disulfide / carbon composite positive electrode material for primary lithium battery has the following steps:

[0032] (1) Mix activated carbon (abbreviated as AC) or mesoporous carbon with ethanol or methanol or acetone at a mass ratio of 1:40 to obtain a suspension; ultrasonically disperse the obtained suspension with an ultrasonic power of 600 watts, keep 4 hours, add pyrite in the suspension, wherein the mass ratio of pyrite to activated carbon or mesoporous carbon is 85:15, after stirring for 5 hours, a mixed paste is obtained; carbon black material can be It is a mixture of activated carbon and mesoporous carbon, and the dispersant can also be a mixture of two or three of ethanol, methano...

Embodiment 3

[0035] Embodiment 3: Iron disulfide / carbon composite positive electrode material for a primary lithium battery. The iron disulfide / carbon composite positive electrode material contains 98% by mass of iron disulfide and 2% by mass of carbon element.

[0036] The preparation method of iron disulfide / carbon composite positive electrode material for primary lithium battery has the following steps:

[0037](1) After mixing carbon nanotubes (abbreviated as MCNTs) or graphene sheets or glucose (abbreviated as GC) or sucrose or starch or p-aminobenzoic acid and N-methylpyrrolidone in a mass ratio of 1:100 , to obtain a suspension; the obtained suspension was ultrasonically dispersed, and the ultrasonic power was 700 watts, and kept for 3 hours, and pyrite was added to the suspension, wherein pyrite and carbon nanotubes or graphene sheets The mass ratio is 98:2, and the mass ratio of pyrite to glucose or sucrose or starch or p-aminobenzoic acid is 97:3. After stirring for 8 hours, a mi...

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Abstract

The invention discloses a ferrous disulfide / carbon composite cathode material of primary lithium battery, wherein the mass percentage of ferrous disulfide is 50-99.5 percent, and the mass percentage of carbon is 0.5-50 percent. The preparation method comprises the steps of: (1) mixing a carbon source material with dispersant in mass ratio of 1:(20-120) to obtain suspension; adding pyrite to the suspension, wherein the mass ratio of the pyrite to the carbon source is (90-99.5):(0.5-10), then mixing for 1-10h to obtain mixed paste; and (2), heating the mixed paste obtained from the step 1 to reach the temperature of 50-150 DEG C under the protection of an inert gas, keeping the temperature for 1-40h, then heating to reaching the temperature of 250-400 DEG C, keeping the temperature for 1-20h, then cooling to the room temperature, and obtaining granular ferrous disulfide / carbon composite cathode material of the primary lithium battery through ball-milling and sieving. The invention has the advantage that the battery prepared by the composite cathode material has higher large-current discharge performance and remarkably improved discharge plateau potential.

Description

technical field [0001] The invention relates to a primary battery electrode material, in particular to a primary lithium battery iron disulfide / carbon composite positive electrode material and a preparation method and application thereof. Background technique [0002] The lithium-iron disulfide battery is a lithium battery composed of iron disulfide as the positive electrode material, metal lithium as the negative electrode material, and an organic electrolyte. The lithium-iron disulfide primary battery is a room temperature discharge battery with a rated voltage of 1.5 V, which matches the current general electrical appliances and can directly replace the traditional 1.5 V aqueous solution battery (such as Zn / HgO, Zn / Ag 2 O, Zn / MnO 2 battery, etc.). Its positive electrode material, iron disulfide, has very excellent characteristics, has low solubility in organic electrolytes, and can maintain its electrochemical reactivity. The theoretical specific capacity of one dischar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397H01M4/136H01M10/0525
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 倪文彬马祖华冯远强李海波郁宇骏
Owner ZHONGYIN NINGBO BATTERY CO LTD
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