Solid solution type FexCo1-xS2 positive electrode material for thermal batteries, and preparation method of solid solution type FexCo1-xS2 positive electrode material

A fexco1-xs2, cathode material technology, applied in the field of material chemistry, can solve the problems of low content, uncontrolled component ratio, affecting the safety and reliability of thermal batteries, etc., achieve single component, reduce design difficulty, and change material chemistry. Effects on activity and thermodynamic stability

Active Publication Date: 2018-09-14
SHANGHAI INST OF SPACE POWER SOURCES
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Problems solved by technology

[0003] In traditional production applications, the preparation of composite positive electrodes is mostly done by simple powder mixing (such as patent number: 201510527112.7, a composite positive electrode material for thermal batteries and its preparation method), although FeS 2 -CoS 2 Composite cathode materials are superior to single-component cathodes in terms of electrochemical performance, but their disadvantage is that FeS 2 The first to decompose, affecting the safety and reliability of thermal batteries
Fe x co 1-x S 2 Solid solutions can be used similar to CoS 2 Synthetic high-temperature sintering method (such as Shenyang University of Science and Technology Journal 34 (2015) 01, discloses a thermal battery CoS 2 High temperature solid phase synthesis and discharge performance test method) to prepare, although the consistency of the solid solution prepared by this method is better, but the Fe in the product x co 1-x S 2 The content is low, and the proportion of components is not controlled

Method used

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  • Solid solution type FexCo1-xS2 positive electrode material for thermal batteries, and preparation method of solid solution type FexCo1-xS2 positive electrode material
  • Solid solution type FexCo1-xS2 positive electrode material for thermal batteries, and preparation method of solid solution type FexCo1-xS2 positive electrode material

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Embodiment 1

[0023] The target product is solid solution Fe for thermal batteries x co 1-x S 2 The weight ratio of the active components of the positive electrode material is: Fe accounts for 26%; Co accounts for 64%. First, according to the ratio of 60wt% Al powder, 18wt% Fe powder, and 42wt% Co powder, three kinds of powders were weighed, mixed and put into a ball mill for 12h, and the powders were taken out and placed in the Ar 2 Tumble dry under cover. The dried powder was packed into a quartz tube, and the Ar 2 Heating to 1000°C under protection for melting; melting the alloy with Ar 2 Spray it onto a copper roller that rotates at a high speed (500rpm) and is passed through with cooling water, so that the alloy is rapidly cooled to obtain a strip-shaped alloy product; the fragile alloy strip is crushed, and 100-200 mesh FeCoAl alloy is sieved. Heat 20wt% NaOH aqueous solution to 85°C, slowly add FeCoAl alloy into the NaOH solution according to the ratio of 100g / L and stir for 2 h...

Embodiment 2

[0025] The target product is solid solution Fe for thermal batteries x co 1-x S 2 The weight ratio of the active components of the positive electrode material is: Fe accounts for 34%; Co accounts for 55%. First, according to the ratio of 60wt% Al powder, 24wt% Fe powder, and 36wt% Co powder, three kinds of powders were weighed, mixed and put into a ball mill for 12 hours, and the powders were taken out and placed in the Ar 2 Tumble dry under cover. The dried powder was packed into a quartz tube, and the Ar 2 Heating to 1000°C under protection for melting; melting the alloy with Ar 2 Spray it onto a copper roller that rotates at a high speed (900rpm) and passes through cooling water, so that the alloy is rapidly cooled to obtain a strip-shaped alloy product; the fragile alloy strip is crushed, and 100-200 mesh FeCoAl alloy is sieved. Heat 20wt% NaOH aqueous solution to 90°C, slowly add FeCoAl alloy to the NaOH solution at a ratio of 100g / L and stir for 2 hours, so that the...

Embodiment 3

[0027] The target product is solid solution Fe for thermal batteries x co 1-x S 2 The weight ratio of the active components of the positive electrode material is: Fe accounts for 43%; Co accounts for 46%. Firstly, three kinds of powders were weighed according to the ratio of 60wt% Al powder, 30wt% Fe powder, and 30wt% Co powder, mixed them, put them into a V-shaped powder mixer, mixed them and dried them. The dried powder was packed into a quartz tube, and the Ar 2 Heating to 1000°C under protection for melting; melting the alloy with Ar 2 Spray it onto a copper roller that rotates at a high speed (1500rpm) and is passed through with cooling water, so that the alloy is rapidly cooled to obtain a strip-shaped alloy product; the fragile alloy strip is crushed, and 100-200-mesh FeCoAl alloy is sieved. Heat 20wt% NaOH aqueous solution to 85°C, slowly add FeCoAl alloy to the NaOH solution according to the ratio of 95g / L and stir for 2 hours, so that the Al in the alloy is fully...

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Abstract

The invention aims at providing a solid solution type FexCo1-xS2 positive electrode material for thermal batteries, and a preparation method of the solid solution type FexCo1-xS2 positive electrode material. The component contents of a Fe-Co alloy skeleton is precisely controlled by a Raney method, and a FexCo1-xS2 solid solution is synthesized by means of a high temperature solid phase vulcanization method. The preparation method provided by the invention can realize the precise regulation and control of the atomic ratio in a target product simply by changing a feeding proportion, and provides the performance-oriented positive electrode material in a customized way aiming at the electrical performance requirements of the thermal batteries. The solid solution type FexCo1-xS2 positive electrode material obtained by using the preparation method provided by the invention has the characteristics of being controllable in active component content, high in electrode potential, stable in voltage platform, small in polarization internal resistance and high in thermal stability; thermal decomposition temperature of the positive electrode material is not lower than 570 DEG C, and the actual discharge specific capacity is not lower than 1300 As / g.

Description

technical field [0001] The invention belongs to the field of material chemistry, in particular to a solid solution type Fe for thermal battery x co 1-x S 2 Cathode material and preparation method thereof. Background technique [0002] MS 2 (M=Fe, Co) is currently the most widely used cathode material for lithium-based thermal batteries. Among them, FeS 2 The electrode potential of the Li negative electrode is 2.2V (compared to CoS 2 0.1V higher), the theoretical capacity is 1206As / g, slightly higher than CoS 2 The 1045As / g is very conducive to improving the output voltage of the thermal battery and the specific energy of the battery mass. However, due to the FeS 2 The thermal stability of the thermal battery is poor, the decomposition is accelerated in the later stage of hot battery discharge, and the self-discharge rate of the battery is increased, which leads to increased capacity loss and shortened working time in the effective voltage platform. with FeS 2 Compar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M6/36
CPCH01M4/5815H01M6/36H01M2004/028
Inventor 韩婷婷程锦胡华荣叶丹宏罗重霄姜义田
Owner SHANGHAI INST OF SPACE POWER SOURCES
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