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Preparation method of fluorinated nano-graphite as cathode material for lithium fluoride battery

A lithium carbon fluoride battery and positive electrode material technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of material performance impact, material embrittlement and cracking, and long graphene preparation process, so as to achieve guaranteed effect and improve fluorine The effect of content

Active Publication Date: 2021-07-13
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon tubes and graphene are typical one-dimensional tubular and two-dimensional layered nanomaterials. Carbon fluoride tubes and fluorinated graphene prepared by carbon tubes and graphene as precursors have good electrochemical properties, but graphene The preparation process is long and the output is low, which limits the preparation and application of fluorinated graphene materials to a certain extent.
The preparation conditions of carbon tubes are relatively harsh. The insertion of fluorine atoms during the fluorination process will cause the material to become brittle and cracked, and the original shape of the material cannot be maintained, which will have a certain impact on the performance of the material.

Method used

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  • Preparation method of fluorinated nano-graphite as cathode material for lithium fluoride battery
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  • Preparation method of fluorinated nano-graphite as cathode material for lithium fluoride battery

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Effect test

Embodiment 1

[0023] 1) Preparation of carbon precursor: Grind flake graphite and steel needles with magnetic stirring for 6 h under the protection of inert gas, cool down to room temperature after grinding, separate nano-graphite and steel needles by sieving, and perform high-temperature heat treatment on nano-graphite. During high temperature heat treatment, the heating rate from room temperature to treatment temperature is 5 ℃∙min -1 , the high temperature heat treatment temperature is 800 ℃, the treatment time is 2 h, and the carbon precursor is obtained;

[0024] 2) Fluorination: Spread the nano-graphite flat into the high-temperature reactor, blow nitrogen and start heating, the heating rate is 5 ℃ min -1 After one hour, the reaction was replaced by fluorine gas, the reaction temperature was 400 °C, and the reaction time was 7 h. After the reaction, the fluorine gas was replaced by nitrogen gas for 12 h and cooled to room temperature to obtain the fluorinated nano-graphite material F-...

Embodiment 2

[0026] 1) Preparation of carbon precursor: Grind flake graphite and steel needles with magnetic stirring for 5.7 h under the protection of inert gas, cool down to room temperature after grinding, separate nano-graphite and steel needles by sieving, and perform high-temperature heat treatment on nano-graphite. During high temperature heat treatment, the heating rate from room temperature to treatment temperature is 4.8 ℃∙min -1 , the high temperature heat treatment temperature is 780 ℃, the treatment time is 2.1 h, and the carbon precursor is obtained;

[0027] 2) Fluorination: spread the nano-graphite into the high-temperature reactor, pass nitrogen gas and start heating, the heating rate is 5 ℃ / min, and change to fluorine gas for reaction after one hour, the reaction temperature is 450 ℃, and the reaction time is 6.2 h, after the reaction, replace the fluorine gas with nitrogen for 12 h and cool down to room temperature to obtain the fluorinated nano-graphite material F-450-7...

Embodiment 3

[0029] 1) Preparation of carbon precursor: Grind flake graphite and steel needles with magnetic stirring under the protection of inert gas for 4.5 h to 7.5 h, cool down to room temperature after grinding, separate nano-graphite and steel needles by sieving, and then grind nano-graphite High temperature heat treatment, the heating rate from room temperature to treatment temperature during high temperature heat treatment is 5.2 ℃∙min -1 , the treatment temperature of high temperature heat treatment is 820 ℃, and the treatment time is 1.9 h to obtain the carbon precursor;

[0030] 2) Fluorination: Spread the nano-graphite flat into the high-temperature reactor, pass nitrogen gas and start heating, the heating rate is 5°C / min, and change to fluorine gas for reaction after one hour, the reaction temperature is 425°C, and the reaction time is 6.3 h, after the reaction, replace the fluorine gas with nitrogen for 12 h and cool down to room temperature to obtain the fluorinated nano-gr...

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Abstract

The invention discloses a preparation method of fluorinated nano-graphite, which is a positive electrode material of a lithium fluoride carbon battery, and belongs to the technical field of lithium battery positive electrode materials. Using magnetic stirring and grinding method to prepare nano-graphite as a precursor, using direct fluorination method, fluorine gas and nano-graphite material to generate intercalation compounds of two elements of carbon and fluorine at high temperature to obtain fluorinated nano-graphite material. The preparation process of the method is simple, the process conditions are relatively mild, and the prepared fluorinated nano-graphite has a stable structure. voltage lag problem. Fluorinated nano-graphite material is a kind of cathode material for lithium carbon fluoride battery with excellent performance.

Description

technical field [0001] The invention discloses a preparation method of fluorinated nano-graphite, which is a positive electrode material of a lithium fluoride carbon battery, and belongs to the technical field of lithium battery positive electrode materials. Background technique [0002] Lithium fluoride battery with metallic lithium as the negative electrode and carbon fluoride material as the positive electrode is known as the lithium primary battery with the largest specific energy. Compared with other lithium primary batteries, lithium fluoride batteries also have the characteristics of stable discharge platform, wide operating temperature range and low self-discharge. The largest application fields of lithium fluoride batteries are special industries such as military industry and aerospace. In addition, lithium fluoride batteries also have broad application prospects in civilian fields such as portable electronic equipment, electronic instruments, chip memory power sup...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/58H01M4/625Y02E60/10
Inventor 周晋王立赵增典李艳艳禚淑萍方治文刘超
Owner SHANDONG UNIV OF TECH
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