A kind of solid solution type Fexco1-xs2 cathode material for thermal battery and preparation method thereof

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...

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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

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