Production of positive active material of lithium battery

A cathode active material, lithium battery technology, applied in electrode manufacturing, iron sulfide, etc., can solve problems such as high open circuit voltage

Inactive Publication Date: 2005-07-27
HUIZHOU CITY DESAY LITHIUM BATTERY S & T CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lead, carbon and a small amount of reducing agent make up the active material of the cathode. The addition of reducing agent can effectively reduce some impurities or other substances with relatively high electrode potential. However, the potential of these impurities or high electrode potential substances is reduced. But some undesired species will still be present, resulting in a high open circuit voltage

Method used

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  • Production of positive active material of lithium battery
  • Production of positive active material of lithium battery
  • Production of positive active material of lithium battery

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0018] The selected pyrite in the present embodiment will pass through crushing and sieving, 75% will pass through 200 mesh sieve (particle size is not more than 0.076mm), and 25% will pass through 325 mesh sieve (particle size is not more than 0.044mm). The purity is 99.44%, the sulfur content is 53.15%, and the iron content is 46.50%. Its impurity content is SiO 2 content is less than 0.1, MgO content is not more than 0.1%, Al 2 o 3 The content of CaO is less than 0.15%, the content of CaO is not more than 0.1%, and the content of acid-soluble iron is 0.38%.

[0019] The heat treatment method adopts a dynamic treatment method, that is, the pyrite is put into a rotary furnace for heat treatment.

[0020] The internal heating type rotary furnace is used to heat the pyrite alternately in dynamic and static state under certain rotation co...

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Abstract

The method includes selecting pyrite: purity is 90-99.44%; sulfur content is 48.1-53.15%; iron content is 42.09-46.50. Impurity content: Sio <0.1-1%; Mgo is less than or equal to 0.1-1%; Al2O3<0.15-1%; Cao is less than or equal to 0.1-1%; acid soluble iron 0.38-1%. The selected pyrite is through breaking, screen sizing (75% passes through 200 mesh screen, 25% passes through 325 mesh screen). Then it will be heat treated at certain condition. After heat treatment it will be cooled until it is below 80deg.C.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a preparation method of iron disulfide as a positive electrode active material of a lithium battery. Background technique [0002] Lithium-iron disulfide battery is a lithium battery with iron disulfide as the positive electrode active material and metal lithium as the negative electrode active material. The diaphragm between the positive and negative electrodes is made of polypropylene and polyethylene composite film (referred to as PP film), the electrolyte is a non-aqueous system, and the electrolyte is LiClO 4 、LiPF 6 、LiCF 3 SO 3 , The positive electrode current collector is made of metal aluminum mesh, the negative electrode current collector is made of nickel-plated steel strip, and the outer shell is made of nickel-plated steel shell. FeS 2 The theoretical capacity is 890mAh g -1 , is relatively high in the positive electrode material; and the theoreti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/12H01M4/04
CPCY02E60/12Y02E60/10
Inventor 刘建华何献文杨建锋
Owner HUIZHOU CITY DESAY LITHIUM BATTERY S & T CO LTD
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