Positive electrode material Fe<x>Co<1-x>S<2> powder of thermal battery and preparation method for powder

A kind of positive electrode material, 0 prone to thermal decomposition reaction, expensive, capacitance drop and other problems

Active Publication Date: 2017-08-08
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But due to FeS 2 The discharge capacity of the battery is low, and it does not match the lithium alloy negative electrode. The no-load voltage of the monomer is only about 2.0V, which is not conducive to further improving the specific energy of the battery; and as the positive electrode active material FeS 2 The decomposition temperature of the battery is about 540°C. At the working temperature of the hot battery (about 500°C), thermal decomposition reactions are prone to occur, resulting in a decrease in capacitance and cannot be discharged for a long time
CoS 2 Although the conductivity is high and the thermal stability is good, the capacity is low and can only be obtained by artificial synthesis, which is expensive and has poor performance stability

Method used

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  • Positive electrode material Fe&lt;x&gt;Co&lt;1-x&gt;S&lt;2&gt; powder of thermal battery and preparation method for powder
  • Positive electrode material Fe&lt;x&gt;Co&lt;1-x&gt;S&lt;2&gt; powder of thermal battery and preparation method for powder
  • Positive electrode material Fe&lt;x&gt;Co&lt;1-x&gt;S&lt;2&gt; powder of thermal battery and preparation method for powder

Examples

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preparation example Construction

[0058] The specific embodiment part of the present invention provides thermal battery anode material Fe x co 1-x S 2 Powder and preparation method thereof, described method such as figure 1 shown, including the following steps:

[0059] (1) raw material iron source and cobalt source are mixed in proportion and made mixed solution;

[0060] (2) Add a precipitating agent to the mixed solution prepared in step (1) and fully stir to carry out a precipitation reaction, and the precipitate obtained in the reaction is washed and filtered to obtain a precipitate;

[0061] (3) The precipitate obtained in step (2) is vacuum-dried to obtain a homogeneously mixed Fe x co 1-x S dry powder;

[0062] (4) Fe in step (3) x co 1-x S dry powder is mixed with excess S powder, and under a protective atmosphere, a compound reaction is carried out to obtain S-containing Fe x co 1-x S 2 Powder;

[0063] (5) Fe containing S obtained in step (4) x co 1-x S 2 The powder is desulfurized un...

Embodiment 1

[0066] This example provides Fe 0.5 co 0.5 S 2 The preparation method of powder, described method comprises the following steps:

[0067] (1) Weigh 139g FeSO 4 ·7H 2 O and 140.5 g CoSO 4 ·7H 2 O is used as the initial raw material, and the two are dissolved in the medium at room temperature at the same time and stirred to make it completely dissolved;

[0068] (2) slowly add 288g precipitating agent Na in the mixed solution that step (1) makes 2 S·9H 2 O, fully stirred at a rate of 130rad / min for 6h during this period to obtain black precipitate Fe 0.5 co 0.5 S, and the precipitate is washed and filtered, and the Ba 2+ After the aqueous solution, no white precipitate is produced, and the precipitate is obtained;

[0069] (3) The precipitate obtained in step (2) was vacuum-dried at 120°C for 21 hours to obtain a homogeneously mixed Fe 0.5 co 0.5 S dry powder;

[0070] (4) Fe in step (3) 0.5 co0.5 S dry powder and 64g sublimated S powder were mixed and placed in a...

Embodiment 2

[0075] This example provides Fe 0.7 co 0.3 S 2 The preparation method of powder, described method comprises the following steps:

[0076] (1) Weigh 194.6g FeSO 4 ·7H 2 O and 84.3 g CoSO 4 ·7H 2 O is used as the initial raw material, and the two are dissolved in the medium at room temperature at the same time and stirred to make it completely dissolved;

[0077] (2) slowly add 288g precipitating agent Na in the mixed solution that step (1) makes 2 S·9H 2 O, fully stirred at a rate of 100rad / min for 10h during this period to obtain a black precipitate Fe 0.7 co 0.3 S, and the precipitate is washed and filtered, and the Ba 2+ After the aqueous solution, no white precipitate is produced, and the precipitate is obtained;

[0078] (3) The precipitate obtained in step (2) was vacuum-dried at 120°C for 20 hours to obtain a homogeneously mixed Fe 0.7 co 0.3 S dry powder;

[0079] (4) Fe in step (3) 0.7 co 0.3 S dry powder and 64g sublimated S powder were mixed and place...

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Abstract

The invention provides positive electrode material Fe<x>Co<1-x>S<2> powder of a thermal battery and preparation method for the powder. In the Fe<x>Co<1-x>S<2> powder, x is greater than 0 and less than 1. The positive electrode material Fe<x>Co<1-x>S<2> powder of the thermal battery is prepared by combination of advantages of two kinds of positive electrode materials of CoS<2> and FeS<2> by a method in combination of chemical deposition and high-temperature solid-phase reaction. The positive electrode material Fe<x>Co<1-x>S<2> powder of the thermal battery has the advantages of high capacity and high voltage platform of the FeS<2>, as well as the advantages of low electrical resistivity and thermal stability of CoS<2>, and is a novel positive electrode material of the thermal battery.

Description

technical field [0001] The field of preparation of thermal battery positive electrode materials of the present invention relates to a thermal battery positive electrode material Fe x co 1-x S 2 Powder and its preparation method. Background technique [0002] Thermal batteries are also called molten salt batteries. The electrolyte is a non-conductive solid at room temperature. Long-term storage and heating activation are its two major features, which are of great significance in both military and civilian fields. In the civilian field, it can be used as a power supply for fire alarms, geothermal heat with harsh environments and high temperatures, and various measuring instruments in the process of oil and gas drilling and exploration. [0003] Sulfides, chlorides and oxides are currently used as positive electrode materials for thermal batteries at home and abroad. Among the chlorides, nickel chloride is the main representative, but it has not been widely used because of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/08H01M4/58
CPCH01M4/08H01M4/5815
Inventor 朱永平胡静禇颖王学营赵丽利
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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