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Method of preparing pyrite powder as electrode material of high-energy lithium-iron battery

A technology of pyrite powder and battery electrodes, which is applied in the field of preparing high-energy lithium-iron battery electrode material pyrite powder, can solve the problems of low discharge platform and large self-discharge, and achieve high current discharge platform, small self-discharge, Good liquid absorption effect

Active Publication Date: 2009-05-06
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, battery manufacturers generally use pyrite powder directly purchased from the market as one of the electrode cathode materials for batteries without any treatment. The battery made of untreated raw pyrite powder has the problems of concave peak voltage, low discharge platform and large self-discharge

Method used

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  • Method of preparing pyrite powder as electrode material of high-energy lithium-iron battery
  • Method of preparing pyrite powder as electrode material of high-energy lithium-iron battery
  • Method of preparing pyrite powder as electrode material of high-energy lithium-iron battery

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Embodiment Construction

[0017] Directly use untreated pyrite powder, its main component is about 94% iron disulfide (FeS 2 ), and the rest are As and Fe - ,Co 2- , Ni 2+ , S - ; It is used as an anode material for lithium-iron batteries. The reason why lithium-iron batteries made with this anode material has the problems of concave peak voltage and low discharge platform; mainly because untreated pyrite powder has the following problems: The problems in aspects are: one is that the content of iron disulfide in pyrite powder is low; the other is that untreated pyrite powder has poor thermal stability; the third is that the packing density of pyrite powder is low; the fourth is the absorption of pyrite powder volume is low. In the first step of the method, the pyrite powder is baked at 100°C to 400°C for 2 to 5 hours in a vacuum state; it is mainly beneficial to increase the iron disulfide content of the pyrite powder, and the impurities + will be oxidized to produce SO 2 Volatilize. And then imp...

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Abstract

Iron buff powder for high energy lithium metal battery electrodes starts with baking the metal powder in 100deg.C- 400deg.C temperature for 2-5 hours in sealed vacuum container, then in the inert gas further heating 10-20 hours in 500deg.C-600deg.C temperature, cooling to normal temperature and ball grinding for 3-5 hours, sorting out those above 300 Deg C and sealing it. It has higher purity ratio and thermostatic feature, with low inner resistance, quick reaction speed, high big current discharge platform, without concave peak voltage.

Description

technical field [0001] The invention relates to a method for processing positive active materials of a high-energy lithium-iron battery, in particular to a method for preparing pyrite powder, an electrode material of a high-energy lithium-iron battery. Background technique [0002] The primary high-energy lithium-iron battery has achieved tremendous development in recent years, especially the development of electronic appliances such as digital cameras, which provides broad prospects and also puts forward higher and higher requirements: high specific energy, good safety, green Environmental protection, small self-discharge and smaller and lighter. [0003] The improvement of the performance of a high-energy lithium iron battery mainly depends on the improvement of the pyrite powder (the main component is iron disulfide) in the positive electrode of the electrode. At present, battery manufacturers generally use pyrite powder directly purchased from the market as one of the e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04
Inventor 李青海吴照伍
Owner SHANDONG GOLDENCELL ELECTRONICS TECH