Iron disulfide positive electrode material and preparation method thereof

A technology of iron disulfide and positive electrode materials, applied in the direction of positive electrodes, nanotechnology for materials and surface science, battery electrodes, etc., can solve problems such as poor high-current discharge performance, high battery open circuit voltage, and large particle size. Achieve the effect of improving conductivity, stable voltage platform and smooth surface

Pending Publication Date: 2020-07-17
东莞市天球实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the positive electrode material used for lithium-iron disulfide batteries is usually natural iron disulfide, which is purified from pyrite, because natural iron disulfide often contains impurities such as chromium, lead and its oxides. , and the particle size is large, the open circuit voltage of the battery assembled directly with natural iron disulfide is too high, and there is also the problem of poor high-current discharge performance

Method used

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  • Iron disulfide positive electrode material and preparation method thereof
  • Iron disulfide positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1), take 100g of natural iron disulfide and place it in a ball mill tank, and at a stirring speed of 200r / min, stirring for 3h, ball mill the natural iron disulfide into fine particles with an average particle size of 10 μm;

[0030] 2) Put the ball-milled iron disulfide granular iron into a mixing tank, add 1L of 0.3mol / L dilute hydrochloric acid, stir for 4 hours at a stirring speed of 300r / min, and filter the stirred mixture with distilled water to wash;

[0031] 3), add 1L of 1.4mol / L dilute sulfuric acid solution to the iron disulfide particles obtained in step 2), mix and stir in a stirring tank, the stirring speed is 300r / min, the stirring time is 4h, and suction filtration is carried out after the stirring is completed;

[0032] 4) The precipitate after suction filtration was washed with distilled water and absolute ethanol in sequence, and after washing, it was baked in a vacuum environment at 100° C. for 3 hours to obtain iron disulfide after removing impuriti...

Embodiment 2

[0037] 1), take 100g of natural iron disulfide and place it in a ball mill tank, and at a stirring speed of 200r / min, stirring for 3h, ball mill the natural iron disulfide into fine particles with an average particle size of 10 μm;

[0038] 2) Put the ball-milled iron disulfide particles into a mixing tank, add 1L of 0.3mol / L dilute hydrochloric acid, stir for 4 hours at a stirring speed of 300r / min, and filter the stirred mixture with distilled water to wash;

[0039] 3), add 1L of 1.4mol / L dilute sulfuric acid solution to the iron disulfide particles obtained in step 2), mix and stir in a stirring tank, the stirring speed is 300r / min, the stirring time is 4h, and suction filtration is carried out after the stirring is completed;

[0040] 4) The precipitate after suction filtration was washed with distilled water and absolute ethanol in sequence, and after the washing was completed, it was baked in a vacuum environment at 100° C. for 3 hours to obtain iron disulfide after rem...

Embodiment 3

[0045] 1), take 100g of natural iron disulfide and place it in a ball mill tank, and at a stirring speed of 200r / min, the stirring time is 3h, and ball mill the natural iron disulfide into fine particles with an average particle size of 10 μm;

[0046] Put the ball-milled iron disulfide particles into a stirring tank, add 1L of 0.3mol / L dilute hydrochloric acid, stir for 4 hours at a stirring speed of 300r / min, suction filter the stirred and mixed mixture, and wash with distilled water;

[0047] 3), add 1L of 1.4mol / L dilute sulfuric acid solution to the iron disulfide particles obtained in step 2), mix and stir in a stirring tank, the stirring speed is 300r / min, the stirring time is 4h, and suction filtration is carried out after the stirring is completed;

[0048] 4) The precipitate after suction filtration was washed with distilled water and absolute ethanol in sequence, and after the washing was completed, it was baked in a vacuum at 100° C. for 2.5 hours to obtain iron disul...

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Abstract

The invention discloses an iron disulfide positive electrode material and a preparation method thereof. The iron disulfide positive electrode material comprises iron disulfide, the surface of the irondisulfide is coated with a metal oxide, and a conductive agent is mixed in the iron disulfide, wherein the mass percent of the iron disulfide is 88%-95%, the mass percent of the conductive agent is 3%-8%, and the mass percent of the metal oxide is 0.5%-4%; the metal oxide is at least one of MgO, ZnO, CuO or TiO2, and the conductive agent is at least one of graphene and carbon nanotubes. The irondisulfide positive electrode material provided by the invention solves the problem that the open-circuit voltage of a battery assembled by the natural iron disulfide is too high.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an iron disulfide cathode material and a preparation method thereof. Background technique [0002] With the development of electronic technology and information technology, the requirements for batteries are getting higher and higher, especially for the capacity of batteries. Common primary batteries include zinc-manganese batteries, alkaline batteries and silver oxide batteries. Zinc-manganese batteries contain heavy metals, which do not conform to the concept of sustainable development; alkaline batteries are the most commonly used batteries on the market, but they have a short shelf life and poor high-current discharge capacity; silver oxide batteries have stable operating voltage and good high-current discharge capacity. But the cost is high. The sulfide has good stability, and the primary battery made of this material as the positive electrode active material has a long ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M6/14B82Y30/00
CPCH01M4/5815H01M4/625H01M4/628H01M6/14B82Y30/00H01M2004/028
Inventor 黄理博李军黄天候
Owner 东莞市天球实业有限公司
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