High-potential and high-power thermal battery cathode material and preparation method thereof

A technology of positive electrode materials and active positive electrode materials, which is applied in the field of high potential and high power thermal battery positive electrode materials and its preparation, can solve the problems of not significantly improving the conductivity of materials, hindering the degree of electrolyte infiltration, hindering electron movement, etc., and achieving excellent The effect of high-power pulse carrying capacity, high-power output capability, and high-current load-carrying capacity

CN109841821AActive Publication Date: 2019-06-04GUIZHOU MEILING POWER SUPPLY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-06-04
Patent Text Reader

Abstract

The invention discloses a high-potential and high-power thermal battery cathode material, which is prepared from the following raw materials by weight percentage: 50-95% of composite high-potential active cathode material, 4-49.5% of high-ionic-conductivity electrolyte and 0.5-20% of high-conductivity electronic conductive agent. The composite high-potential active cathode material is composed of,by weight percentage, 5-95% of FeF3 and 5-95% of FeF2. The high-ionic-conductivity electrolyte is LiF-NaF-LiCl or LiF-KF-LiCl eutectic molten salt. The thermal battery cathode material of the invention can significantly improve the monomer potential of thermal battery cathodes to more than 3.2V, significantly reduce the number of series monomers under high voltage, reduce the battery height, is not miscible with high-ionic-conductivity electrolyte, and has excellent high-power pulse carrying capacity, fast reaction characteristic and high-power load and fast activation capabilities.
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Description

technical field

[0001] The invention belongs to the technical field of thermal batteries, and in particular relates to a high-potential and high-power thermal battery cathode material and a preparation method thereof. Background technique

[0002] In various temperatures, climates and dynamic environments, thermal batteries have a maintenance-free shelf life of up to 20 years, because the ionic conductivity of the molten salt electrolyte used exceeds that of conventional lithium-ion battery electrolytes by many orders of magnitude, so its It can provide high-power output performance and ensure the power demand of power supply equipment. It is an ideal choice for military and aerospace electrical equipment batteries.

[0003] The existing thermal battery system is dominated by lithium-based negative electrodes, which include lithium-silicon alloys and lithium-boron alloys. The potential of lithium-silicon alloy to lithium is 157mV, while the potential of lithium-boron alloy ...

Examples

Embodiment 1

[0043] A high-potential and high-power thermal battery positive electrode material is prepared from the following raw materials according to weight percentage: 50% of composite high-potential active positive electrode material, 49.5% of high-ionic conductivity electrolyte, and 0.5% of high-conductivity electronic conductive agent; The composite high potential active cathode material is composed of 69.1% FeF by weight 3 and 30.9% FeF 2 Common composition, its preparation method is an in-situ synthesis method; the high ion conductivity electrolyte is a LiF-NaF-LiCl eutectic molten salt.

[0044] Further, using the in-situ synthesis method to prepare a composite high-potential active positive electrode material specifically includes the following steps:

[0045] (1) Fluorination: Fe 2 o 3 As a raw material, put it in a high-pressure reactor and mix it with HF solution at room temperature, let it stand, heat and keep it warm, and generate FeF 3 , the FeF was washed off with di...

Embodiment 2

[0053] A high-potential and high-power thermal battery positive electrode material is prepared from the following raw materials according to weight percentage: 95% of composite high-potential active positive electrode material, 4% of high-ionic conductivity electrolyte, and 1% of high-conductivity electronic conductive agent; The composite high potential active cathode material is composed of 65.3% FeF by weight 3 and 34.7% FeF2 Common composition, its preparation method is an in-situ synthesis method; the high ion conductivity electrolyte is a LiF-NaF-LiCl eutectic molten salt.

[0054] Further, using the in-situ synthesis method to prepare a composite high-potential active positive electrode material specifically includes the following steps:

[0055] (1) Fluorination: Fe 2 o 3 As a raw material, put it in a high-pressure reactor and mix it with HF solution at room temperature, let it stand, heat and keep it warm, and generate FeF 3 , the FeF was washed off with distilled...

Embodiment 3

[0063] A high-potential and high-power thermal battery positive electrode material is prepared from the following raw materials according to weight percentage: 55% of composite high-potential active positive electrode material, 25% of high-ionic conductivity electrolyte, and 20% of high-conductivity electronic conductive agent; Composite high-potential active cathode material consists of 90% FeF by weight 3 and 10% FeF 2 Common composition, the preparation method is a direct mixing method; the high ion conductivity electrolyte is LiF-KF-LiCl eutectic molten salt.

[0064] Further, the specific method for preparing the composite high-potential active positive electrode material by direct mixing is as follows: FeF 3 and FeF 2 The raw materials are fed into a high-energy ball mill according to weight percentage, and ball-milled for 3 minutes in a high-energy ball mill with a rotating speed of 600r / min.

[0065] Further, the ionic conductivity of the electrolyte with high ionic...