a fef 3 Composite cathode material and preparation method thereof

A composite positive electrode material and powder technology, which is applied in the field of FeF3 composite positive electrode material and its preparation, can solve the problems such as poor conductivity of materials, poor conductivity between material particles, and influence on the safety performance of thermal batteries. Swelling problem, large usable specific capacity, effect of high operating voltage

Active Publication Date: 2020-10-13
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a cathode material, metal fluoride can not only intercalate and extract lithium ions, but also react with lithium to store energy; this leads to excessive thermal reactions inside the thermal battery and produces more gas, which will not only affect the performance of the cathode material. structure, will also affect the safety performance of the thermal battery
Although the above two patents have improved the electrical conductivity in the metal fluoride cathode material to a certain extent, they have not improved the electrical conductivity between the material particles, and have not completely solved the problem of poor electrical conductivity of the material, nor have they solved the problem caused by the doping of carbon materials. CO 2 gas expansion problem

Method used

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  • a fef <sub>3</sub> Composite cathode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] a FeF 3 The preparation method of composite cathode material comprises the following steps:

[0028] (1) Take Fe(NO) 3 Dissolved in ethanol, stirred evenly, prepared solution A; took carbon nanotubes dissolved in ethanol, stirred evenly, prepared solution B;

[0029] (2) Mix solution A and solution B in proportion to form solution C, mix the fluoride solution and solution C at -5°C to 8°C, stir and react for 10 hours, and filter to obtain carbon-coated FeF 3 Precipitation; Among them, Fe(NO) in solution C 3 The mass ratio to carbon nanotubes is 100:1;

[0030] (3) Carbon coated FeF 3 The precipitate was placed in a vacuum drying oven, dried at 60°C for 8 hours, crushed, and passed through a 300-mesh sieve to obtain carbon-coated FeF 3 Positive electrode powder;

[0031] (4) Carbon-coated FeF 3 The positive electrode powder is mixed with 30% of its mass LiF and 2% to its mass of Li 2 ZrO 3 , ball milled at a rate of 100r / min for 4h to obtain FeF 3 Composite cat...

Embodiment 2

[0033] a FeF 3 The preparation method of composite cathode material comprises the following steps:

[0034] (1) Take FeCl 3 Dissolved in ethanol, stirred evenly, prepared solution A; dissolved graphene in ethanol, stirred evenly, prepared solution B;

[0035] (2) Mix solution A and solution B in proportion to form solution C, mix the fluoride solution and solution C at -5°C to 8°C, stir and react for 12 hours, and filter to obtain carbon-coated FeF 3 Precipitation; Among them, FeCl in solution C 3 The mass ratio to graphene is 100:6;

[0036] (3) Carbon coated FeF 3The precipitate was placed in a vacuum drying oven, dried at 100°C for 6 hours, crushed, and passed through a 200-mesh sieve to obtain carbon-coated FeF 3 Positive electrode powder;

[0037] (4) Carbon-coated FeF 3 The positive electrode powder is mixed with 5% of its mass LiCl and its mass of 10% Li 4 SiO 4 , ball milled at a rate of 100-1000r / min for 1-4h to obtain FeF 3 Composite cathode powder.

Embodiment 3

[0039] a FeF 3 The preparation method of composite cathode material comprises the following steps:

[0040] (1) Dissolve the ferric salt in ethanol and stir evenly to prepare solution A; dissolve the conductive agent in ethanol and stir uniformly to obtain solution B; wherein the ferric salt is Fe(NO) 3 , FeCl 3 The mixture, conductive agent is the mixture of graphene, KS-6 graphite;

[0041] (2) Mix solution A and solution B in proportion to form solution C, mix the fluoride solution and solution C at -5°C to 8°C, stir and react for 24 hours, and filter to obtain carbon-coated FeF 3 Precipitation; wherein, the mass ratio of the ferric salt to the conductive agent in solution C is 100:10;

[0042] (3) Carbon coated FeF 3 The precipitate was placed in a vacuum drying oven, dried at 150°C for 2 hours, crushed, and passed through a 100-mesh sieve to obtain carbon-coated FeF 3 Positive electrode powder;

[0043] (4) Carbon-coated FeF 3 The positive electrode powder is mixed...

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Abstract

The invention belongs to the technical field of a thermal battery material, and particularly relates to a FeF3 composite positive electrode material and a preparation method thereof. The FeF3 composite positive electrode material is a lithium-rich carbon layer-coated FeF3 composite material. The preparation method comprises the following steps of (1) taking and dissolving a ferric iron salt in ethyl alcohol, performing uniform stirring to prepare a solution A, taking and dissolving a conductive agent in the ethyl alcohol, and performing uniform stirring to prepare a solution B; (2) mixing thesolution A and the solution B to form a solution C according to a proportion, mixing a fluoride solution with the solution C under a low temperature, performing stirring reaction and filtering to obtain carbon-coated FeF3 precipitant; (3) drying, smashing and sieving the carbon-coated FeF3 precipitant to obtain carbon-coated FeF3 positive electrode powder; and (4) doping a halogen lithium salt anda lithium-based CO2 absorption agent into the carbon-coated FeF3 positive electrode powder, and performing ball-milling to obtain the FeF3 composite positive electrode powder. The FeF3 composite positive electrode powder provided by the invention is high in working voltage, large in specific capacity and good in conductivity and has a function of CO2 absorption, and the safety of the thermal battery is improved.

Description

technical field [0001] The invention belongs to the technical field of thermal battery materials, in particular to a FeF 3 Composite cathode material and preparation method thereof. Background technique [0002] Thermal battery is a heat-activated reserve battery. When stored at room temperature, the electrolyte is a non-conductive solid. When in use, an electric ignition head or a firing pin mechanism is used to ignite the heating agent inside, so that the electrolyte melts into an ion conductor and is activated. A reserve battery, the storage time is theoretically unlimited, and the actual measurable value is more than 17 years. Thermal batteries have low internal resistance, wide operating temperature range, long storage time, quick and reliable activation, and no maintenance, and have developed into an ideal power source for modern weapons. [0003] With the rapid development of the defense industry, the requirements for thermal batteries in various application fields ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M4/08H01M6/36
CPCH01M4/08H01M4/366H01M4/582H01M4/583H01M4/625H01M6/36H01M2004/028
Inventor 孟剑李云伟陈铤万伟华王京亮潘志鹏吴启兵
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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