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Natural iron lithium disulfide cathode material and production method

A technology of lithium iron disulfide and positive electrode materials, which is applied in battery electrodes, electrode manufacturing, structural parts, etc., can solve the problems of low voltage platform and low concave voltage, and achieve the effects of improving discharge effect, easy large-scale amplification, and stable process route

Active Publication Date: 2011-06-01
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] But on the whole, none of the above processes is aimed at FeS 2 Solve the problems of low voltage platform and concave voltage in the discharge of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 100 g of commercially available natural iron disulfide mineral fine powder (with an average particle size of 25 μm) was ball milled under nitrogen protection until the average particle size reached 5 μm. Then mix 100g of distilled water together with 0.1g of analytically pure lithium hydroxide, and form a suspension after stirring evenly. The suspension was heated in a water bath and kept at 80°C for 4h. Then pour out the slurry, and dry the slurry in a vacuum oven less than 0.01MPa at 80°C. Then the dried material was calcined at 300° C. for 4 h under the protection of nitrogen. The calcined material is crushed and sieved to make lithiated iron disulfide powder.

Embodiment 2

[0035] 1 kg of commercially available natural iron disulfide mineral fine powder (with an average particle size of 50 μm) was ball milled under the protection of argon until the average particle size reached 10 μm. Then mix 20kg of distilled water together with 50g of analytically pure lithium hydroxide, and form a suspension after stirring evenly. The suspension was heated in a water bath and kept at 100 °C for 10 h. Then pour out the slurry, and dry the slurry at 120° C. in a vacuum oven less than 0.01 MPa. Then the dried material was calcined at 450° C. for 0.5 h under the protection of argon gas. The calcined material is crushed and sieved to make lithiated iron disulfide powder.

Embodiment 3

[0037] 10 kg of commercially available natural iron disulfide mineral fine powder (with an average particle size of 35 μm) was ball milled under nitrogen protection until the average particle size reached 8 μm. Then mix with 100g of analytically pure lithium hydroxide into 50kg of distilled water, and stir to form a suspension. The suspension was heated in a water bath and kept at 95°C for 6h. Then pour out the slurry, and dry the slurry at 100° C. in a vacuum oven less than 0.01 MPa. The dried material was calcined at 375° C. for 1 h under the protection of argon gas. The calcined material is crushed and sieved to make lithiated iron disulfide powder.

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Abstract

The invention discloses natural iron lithium disulfide cathode materials. Lithium compounds are uniformly coated on the surface of the material crystals, and lithium ions are led to permeate into the surface layer of the iron disulfide cathode materials through high temperature heat treatment so as to cause lithium to be inserted into part of the iron disulfide cathode materials. A production method comprises the following steps: natural iron disulfide mineral concentration powders are milled and crushed under protection of inert gas; the crushed natural iron disulfide mineral concentration powders and analytically pure soluble lithium compounds are mixed into distilled water together according to a weight ratio of 0.1 to 5:100 to form suspension liquid, and the weight ratio of all the solid matters and the distilled water is 1:1 to 20; the suspension liquid is uniformly stirred and is heated in water bath for 4 to 10 h under constant temperature of 80 DEG C to 100 DEG C; slurry is poured out, and is dried in a vacuum oven; then the dried materials are calcined for 0.5 h to 4 h under the protection of the inert gas and temperature of 300 DEG C to 450 DEG C; and the calcined materials are made into powders through crushing and sieving. The invention can efficiently improve the discharge effect of the materials, and overcomes the polarization at the start of discharge.

Description

technical field [0001] The invention relates to a lithium / iron disulfide battery cathode material and a surface treatment method thereof, in particular to a natural iron disulfide lithiated cathode material. Background technique [0002] The primary lithium / iron disulfide battery (referred to as lithium-iron battery) has the characteristics of large discharge current, common use with the existing 1.5V alkaline zinc-manganese battery, and high capacity, and is suitable for use in digital products in modern society. Its structure uses metal lithium as the negative electrode and iron disulfide as the positive electrode. Among them, the main factor affecting the performance of the battery is the positive iron disulfide (FeS 2 )Material. [0003] FeS 2 When used as a positive electrode material for a lithium battery, lithium ions need to be inserted between the lattices. Electrode discharge is the process of lithium insertion: [0004] 2Li + +2e - +FeS 2 → Li 2 FeS 2 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/04
CPCY02E60/12Y02E60/10
Inventor 梁广川郝德利
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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