Impurity removal method for positive active material of lithium-ferrous disulfide battery

A positive electrode active material, ferrous disulfide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of battery electrical performance impact, not in line with economic principles, acid is not easy to remove, etc.

Active Publication Date: 2015-12-16
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Li / FeS 2 As a high-energy lithium primary battery, once the internal short circuit occurs, the heat generation may increase sharply due to the increase of the short-circuit current, resulting in Li / FeS 2 The occurrence of safety incidents of battery explosion and fire
[0004] In order to remove metal impurity ions in natural pyrite, the Chinese invention patent application with publication number CN102396088A discloses a method for removing impurities from electrodes with an acid solution, but this method has the problem that the newly introduced acid is not easy to remove after pickling , if the acid stays in the electrode, it will affect the Li / FeS 2 The electrical performance of the battery is affected; in addition, in the process of baking to remove a large amount of water, the water will react with the ferrous disulfide powder to regenerate Fe 2+ or Fe 3+ Impurities
The Chinese invention patent application with the publication number CN102473896A discloses the method of adding a chelating agent to the electrolyte to remove the impurities introduced into the battery cell, but in this method, whether the addition of the chelating agent to the battery will affect the electrical performance, storage performance or safety performance of the battery To eliminate these doubts, it will take a lot of manpower, material resources and time to verify, so it does not conform to the principle of economy

Method used

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  • Impurity removal method for positive active material of lithium-ferrous disulfide battery

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The positive electrode active material of the lithium-iron disulfide battery is subjected to impurity removal treatment, and the steps are as follows:

[0027] Commercially available ferrous disulfide powder is used as the positive electrode active material of the lithium-ferrous disulfide battery; in order to simulate the influence of the ferrous disulfide powder being damp during use, the ferrous disulfide powder is placed at a humidity of 75% ± 5 %, placed in an environment with a temperature of 25°C±5°C for 5 days;

[0028] The mixed solvent (DOL:DME=75wt%:25wt%) of gained ferrous disulfide powder is carried out Soxhlet extraction with ethylene glycol dimethyl ether and 1,3-dioxolane, and the temperature of Soxhlet extraction method is 80 ℃;

[0029] Then vacuum-dry the ferrous disulfide powder: bake the ferrous disulfide powder under the vacuum condition of 100° C. until the moisture content is below 0.1 wt%.

[0030] The ferrous disulfide powder after the impuri...

Embodiment 2

[0032] The positive electrode active material of the lithium-iron disulfide battery is subjected to impurity removal treatment, the method and steps are basically the same as those in Example 1, the difference is that:

[0033] 1. In the mixed solvent of ethylene glycol dimethyl ether and 1,3-dioxolane, the weight percentage of ethylene glycol dimethyl ether is 45%, and the weight percentage of 1,3-dioxolane is 55%;

[0034] 2. The temperature of the Soxhlet extraction method is 70°C;

[0035] 3. The temperature for vacuum drying the ferrous disulfide powder is 70°C.

Embodiment 3

[0037] The positive electrode active material of the lithium-iron disulfide battery is subjected to impurity removal treatment, the method and steps are basically the same as those in Example 1, the difference is that:

[0038] 1. In the mixed solvent of ethylene glycol dimethyl ether and 1,3-dioxolane, the weight percentage of ethylene glycol dimethyl ether is 35%, and the weight percentage of 1,3-dioxolane is 65%;

[0039] 2. The temperature of the Soxhlet extraction method is 90°C;

[0040] 3. The temperature for vacuum drying the ferrous disulfide powder is 150°C.

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Abstract

The invention belongs to the technical field of primary lithium batteries, and discloses an impurity removal method for a positive active material of a lithium-ferrous disulfide battery. The method comprises the steps as follows: the positive active material containing ferrous disulfide powder is provided; the positive active material is extracted by an organic solvent; impurities are removed from the positive active material; the active material is subjected to vacuum drying; and an organic solvent is glycol dimethyl ether and/or 1,3-dioxolame. The impurities in the positive active material of the lithium-ferrous disulfide battery are extracted directly by a solvent component for preparing electrolyte, so that a new impurity is not introduced into the battery; the positive active material does not contact a lot of water to generate a Fe<2+> or Fe<3+> impurity; the extracted positive active material can be directly used after being dried; the problems that the electrical property, the storage property or the safety performance and the like of the battery are not affected by adding an additive to the battery are overcome; and the impurity removal method is relatively economical and applicable.

Description

technical field [0001] The invention belongs to the technical field of lithium primary batteries, and relates to a treatment technology for the positive active material of a lithium-ferrous disulfide battery, in particular to a method for removing impurities from the positive active material of a lithium-ferrous disulfide battery. Background technique [0002] Lithium-iron disulfide (Li / FeS 2 ) battery is a low-voltage lithium battery, and its operating voltage platform is 1.5V. Therefore, it can be interchanged with alkaline manganese (Zn / MnO 2 ) batteries, nickel-metal hydride batteries, carbon batteries, zinc-silver batteries as energy sources for ordinary portable consumer electronic devices. Lithium-iron disulfide batteries have a higher ratio than alkaline manganese (Zn / MnO) of the same size 2 ) batteries, nickel-metal hydride batteries, carbon batteries or zinc-silver batteries have a much larger discharge specific capacity, and are environmentally friendly, light i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5815H01M10/0525Y02E60/10
Inventor 祝媛程琛王彦斌刘建华刘金成
Owner EVE ENERGY CO LTD
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