Method for preparing lithium-iron disulfide battery anode piece

A technology of iron disulfide batteries and positive plates, which is applied to the electrodes of primary batteries, etc., and can solve the problems of insufficient high-power discharge performance and other problems

Active Publication Date: 2013-04-17
ZHONGYIN NINGBO BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to avoid the heat generated in the crushing process from causing FeS 2 over-oxidation, this method can only get coarse-grained FeS 2 Material
However, the lithium-iron disulfide battery produced in this way has insufficient performance in terms of open circuit voltage, discharge platform, and high-power discharge performance.

Method used

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  • Method for preparing lithium-iron disulfide battery anode piece
  • Method for preparing lithium-iron disulfide battery anode piece
  • Method for preparing lithium-iron disulfide battery anode piece

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preparation example Construction

[0027] The invention provides a method for preparing a lithium-iron disulfide battery positive plate, which contains the following steps in sequence: fine-grained FeS 2 powder, coarse particle size FeS 2 The powder is heat-treated in an inert gas atmosphere, the treatment temperature is 200°C-300°C, and the time is 1-5 hours; the fine-grained FeS 2 The particle size distribution range is 0.1~1μm; the coarse particle size FeS 2 The particle size distribution range is 10~60μm. Q2: The heat-treated fine-grained FeS 2 The powder is dispersed in the dispersant, stirred at a speed of 10-50r / min, and ultrasonically dispersed for 1-5 hours at the same time, the ultrasonic power is 300-800W, and the ultrasonic temperature is 20°C-40°C to obtain a mixed suspension; the dispersion The agent is N-methylpyrrolidone, acetone, isobutanol or a mixture of two or three of them; the fine particle size FeS 2 The range of mass ratio to dispersant is 1:5~1:10. Dissolve the binder in the dissol...

Embodiment 1

[0033] Weigh fine-grained FeS with a particle size distribution of 0.1-1 μm 2 Coarse particle size FeS with 50g powder and particle size distribution of 10~60μm 2 950 g of powder was heated at 300° C. for 3 hours in a vacuum oven filled with nitrogen. Heat-treated fine-grained FeS 2 The powder is dispersed in a beaker containing 500g of isobutanol, stirred at a speed of 50r / min at a temperature of 40°C, and ultrasonically dispersed at a power of 800W for 3 hours to obtain FeS 2 Suspension. Weigh 55g of styrene-butadiene rubber, disperse it in another beaker containing 550g of isobutanol, stir at a speed of 40r / min for 3 hours, and obtain a uniform solution after completely dissolving. FeS 2 The suspension was transferred to the homogeneous solution 10 times and dispersed with stirring at 30r / min; after the transfer was completed, continue to stir at a speed of 30r / min for 2 hours to obtain FeS 2 viscous suspension. Weigh 31g of acetylene black, and heat-treated coarse pa...

Embodiment 2

[0035] Weigh fine-grained FeS with a particle size distribution of 0.1-1 μm 2 100g powder, coarse particle size FeS with particle size distribution of 10~60μm 2 900 g of powder was heated at 250° C. for 1 hour in a vacuum oven filled with nitrogen. Heat-treated fine-grained FeS 2 The powder is dispersed in a beaker containing 500g of N-methylpyrrolidone, stirred at a speed of 20r / min at a temperature of 20°C, and ultrasonically dispersed at a power of 300W for 1 hour to obtain FeS 2 Suspension. Weigh 33g of polyvinylidene fluoride, disperse it in another beaker containing 400g of N-methylpyrrolidone, stir at a speed of 20r / min for 1 hour, and obtain a uniform solution after completely dissolving. FeS 2 The suspension was transferred to the homogeneous solution 20 times and dispersed with stirring at 20r / min; after the transfer, continue to stir at a speed of 20r / min for 1 hour to obtain FeS 2 viscous suspension. Take by weighing carbon black 55g, and through heat-treated...

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Abstract

The invention provides a method for preparing a lithium-iron disulfide battery anode piece. The method comprises the steps that FeS2 is taken as an active anode material, the size distribution of FeS2 respectively ranges from 0.1um to 1 um and from 10 um to 60 um, and firstly FeS2 is subjected to heat treatment in an inert gas at the temperature from 200 DEG C to 300 DEG C until elemental sulfur content in FeS2 is not higher than 0.3%; then FeS2 with fine granularity is subjected to ultrasonic dispersion at the temperature from 20 DEG C to 40 DEG C with power in a range from 300 W to 800 W; the obtained turbid liquid is added into a binding agent solution, and then the solution is integrally transferred to a mixture of FeS2 with coarse granularity and a conductive agent, and the mixture is uniformly stirred; and finally the anode piece is formed by the obtained anode paste according to working procedures of coating, press rolling and piece making, and then a lithium-iron disulfide battery is further prepared. A mass ratio of the FeS2 with fine granularity to the FeS2 with coarse granularity ranges from 1:99 to 1:4. According to the lithium-iron disulfide battery prepared by the method, the open-circuit voltage of the battery is reduced, the discharge platform is lifted, and the high-power discharge performance is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium battery materials, and in particular relates to a preparation method of a positive electrode sheet of a lithium-iron disulfide battery. Background technique [0002] The lithium-iron disulfide primary battery is a lithium battery that consists of iron disulfide, a conductive agent and a binder, a positive electrode, a lithium metal or a lithium metal-based alloy as a negative electrode, and an organic solvent and an inorganic salt as an electrolyte. Its rated voltage is 1.5V, which is different from traditional 1.5V aqueous solution batteries (such as Zn / HgO, Zn / Ag 2 O, Zn / MnO 2 Batteries, etc.) can be used interchangeably, and have excellent performance in terms of energy density, high-power characteristics, and storage life. FeS 2 Its natural reserves are abundant and environmentally friendly, its solubility in organic electrolytes is low, and it can maintain high electrochemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/08
Inventor 倪文彬钱靖
Owner ZHONGYIN NINGBO BATTERY CO LTD
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