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Synthesis method of FeS2 composite positive electrode material, and battery

A composite positive electrode material and synthesis method technology, applied in the field of synthesis of FeS2 composite positive electrode materials, can solve the problems of high open circuit voltage, hindrance to industrialization development, low discharge performance, etc., and achieve the effects of prolonging life, facilitating transmission, and high specific capacity

Active Publication Date: 2017-12-15
东莞市天球实业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the lithium battery using iron disulfide as the positive electrode material has the problems of high open circuit voltage and low discharge performance during discharge, which hinders its further industrial development.

Method used

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  • Synthesis method of FeS2 composite positive electrode material, and battery
  • Synthesis method of FeS2 composite positive electrode material, and battery
  • Synthesis method of FeS2 composite positive electrode material, and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment one: a kind of FeS 2 Composite positive electrode material, the composite positive electrode material is coated with FeS by metal powder 2 powder, where the FeS 2 The mass percentage content of the powder is 98%, the mass percentage content of the metal powder is 2%, and the metal powder is zinc powder.

[0026] Its preparation steps are as follows:

[0027] (1) Weighing 1.44g of ferrous oxalate, 3g of thiourea and 0.03g of PVP was dissolved in 50mL of deionized water to form a mixed solution;

[0028] (2) Stir the mixed solution at a constant temperature in a water bath at 60° C. for 1 hour, then add 3.72 g of disodium EDTA and 0.96 g of sulfur powder, keep stirring, adjust the pH of the solution to 7 with ammonia water, and form a sol;

[0029] (3) After the sol is formed, it is heated to 70° C. and stirred for 3 hours to obtain a wet gel, which is dried at 120° C. under vacuum for 8 hours to obtain a dry gel;

[0030] (4) Place the obtained xerogel in ...

Embodiment 2

[0035] Embodiment two: a kind of FeS 2 Composite positive electrode material, the composite positive electrode material is coated with FeS by metal powder 2 powder, where the FeS 2 The mass percentage content of the powder is 98%, the mass percentage content of the metal powder is 2%, and the metal powder is copper powder.

[0036] Its preparation steps are as follows:

[0037] (1) Take by weighing 2.68g of ferrous citrate, 1.5g of thiourea and 0.027g of PVP dissolved in 50mL of deionized water to form a mixed solution;

[0038] (2) Stir the mixed solution at a constant temperature in a 55°C water bath for 0.5h, then add 3.84g of citric acid and 1.28g of sulfur powder, keep stirring, adjust the pH of the solution to 7.5 with ammonia water, and form a sol;

[0039] (3) After the sol is formed, it is heated to 80° C. and stirred for 2 hours to obtain a wet gel, which is dried at 140° C. under vacuum for 6 hours to obtain a dry gel;

[0040] (4) Place the obtained xerogel in ...

Embodiment 3

[0044] Embodiment three: a kind of FeS 2 Synthesis method and battery of composite positive electrode material, the composite positive electrode material is coated with FeS by metal powder 2 powder, where the FeS 2 The mass percentage content of the powder is 98%, the mass percentage content of the metal powder is 2%, and the metal powder is silver powder.

[0045] Its preparation steps are as follows:

[0046] (1) Take by weighing 1.74g of ferrous acetate, 2.25g of thiourea and 0.02g of PVP dissolved in 50mL of deionized water to form a mixed solution;

[0047] (2) Stir the mixed solution at a constant temperature in a water bath at 50° C. for 1 hour, then add 3.72 g of disodium EDTA and 0.16 g of sulfur powder, keep stirring, adjust the pH of the solution to 8 with ammonia water, and form a sol;

[0048] (3) After the sol is formed, heat it up to 75°C and stir for 2.5 hours to obtain a wet gel, and dry the obtained wet gel at 130°C under vacuum for 10 hours to obtain a dr...

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Abstract

The invention discloses a synthesis method of a FeS2 composite positive electrode material, and a battery. The method comprises the following steps: dispersing a ferrous salt of an organic acid, thiourea, PVP and a chelating agent in a solvent, carrying out a polymerization reaction to form sol, further generating gel, carrying out heat treatment and grinding to prepare FeS2 powder, adding metal powder with the mass percentage of 0.1-2%, and carrying out surface coating in order to obtain the FeS2 composite positive electrode material. The battery comprises the composite positive electrode material synthesized through the method. The synthesized composite positive electrode material has the characteristics of high purity, small particle size, fast ion diffusion rate and high specific capacity, and effectively controls the open circuit voltage of the produced battery to be lower than 1.83 V; and the metal powder is used to coat iron disulfide, so the electric conductivity of the positive electrode material is enhanced, the rate performances are improved, the erosion of an electrolyte to the material is alleviated, the life of the battery is prolonged, and the discharge performance of the battery at a heavy current is effectively improved.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium primary batteries, in particular to a FeS 2 Synthesis method and battery of composite cathode material. Background technique [0002] Lithium-iron disulfide battery is a high-energy, light-weight, and environmentally friendly primary lithium battery. It can be used in a wide temperature range and can be used in the temperature range of -40 to 60 ° C. Among them, the low-temperature performance is particularly outstanding, and the energy density is high. The positive electrode material of the battery is two The theoretical capacity of iron sulfide is 890mAh / g, and the capacity of a single AA (No. 5) battery is higher than 3000mAh. When used in heavy-duty applications, the performance is 4 to 10 times that of ordinary batteries. Currently, it is mainly used in digital products, mobile In electrical appliances such as telephones, wireless equipment, medical equipment, game cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M6/14
CPCH01M4/362H01M4/5815H01M4/626H01M4/628H01M6/14
Inventor 黄理博
Owner 东莞市天球实业有限公司
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