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Nanometer FeF3/C composite positive electrode material, preparation method thereof and lithium ion battery

A composite positive electrode material and lithium-ion battery technology, applied in the field of energy storage materials, can solve the problems of reversible specific capacity, rate performance and cycle performance to be improved, and achieve in-situ coating, excellent rate performance and high uniformity Effect

Inactive Publication Date: 2021-05-14
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]However, the electrode material obtained by the above scheme needs to be improved in terms of reversible specific capacity, rate performance and cycle performance

Method used

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  • Nanometer FeF3/C composite positive electrode material, preparation method thereof and lithium ion battery
  • Nanometer FeF3/C composite positive electrode material, preparation method thereof and lithium ion battery

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Experimental program
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Embodiment 1

[0044] This embodiment provides a nano-FeF 3 / C composite cathode material and preparation method thereof, the preparation method comprising the following steps:

[0045] (1) Ferrocene and polytetrafluoroethylene are mixed evenly in a ratio of 1:3 according to the mol ratio of iron and fluorine;

[0046] (2) The resulting mixed powder is transferred to a closed reaction kettle, and the reaction kettle is filled with argon;

[0047] (3) Heat-treat the closed reaction vessel under an argon atmosphere, raise the temperature to 600°C for 1 hour at a rate of 5°C / min, and obtain FeF after cooling. 3 / C cathode material.

[0048] figure 1 It is the FeF prepared in this example 3 / C positive electrode material XRD pattern, as can be seen from the figure, the diffraction peaks of the prepared sample are consistent with the FeF 3 (PDF#88-2023) has a high degree of agreement with the standard spectrum, confirming that FeF has been successfully obtained 3 , and there is no impurity ...

Embodiment 2

[0052] This embodiment provides a nano-FeF 3 / C composite cathode material and preparation method thereof, the preparation method comprising the following steps:

[0053] (1) Ferrous chloride, polytetrafluoroethylene are mixed evenly according to the ratio of 1:6 according to the mol ratio of iron and fluorine;

[0054] (2) The resulting mixed powder is transferred to an airtight reactor, and the reactor is filled with nitrogen;

[0055] (3) Heat-treat the closed reactor in a nitrogen atmosphere, heat up to 900°C at a rate of 30°C / min for 0.5h, and obtain FeF after cooling. 3 / C cathode material.

[0056] The obtained positive electrode material was used as the lithium ion battery positive electrode material for electrochemical performance testing, and the ratio of the electrode sheet was positive electrode material: acetylene black: PTFE (mass ratio) = 90:5:5. A CR2025 button cell was prepared with a lithium sheet as a reference electrode. In the voltage window of 1.2-4.5...

Embodiment 3

[0058] This embodiment provides a nano-FeF 3 / C composite cathode material and preparation method thereof, the preparation method comprising the following steps:

[0059] (1) Ferrocene, ferrous chloride, and polytetrafluoroethylene are uniformly mixed in a ratio of 1:1 according to the mol ratio of iron and fluorine; wherein, the mol ratio of ferrocene and ferrous chloride is 1:1 .

[0060] (2) The resulting mixed powder is transferred to an airtight reactor, and the reactor is filled with helium;

[0061] (3) Heat-treat the closed reactor in a nitrogen atmosphere, raise the temperature to 400°C for 12 hours at a rate of 1°C / min, and obtain FeF after cooling. 3 / C cathode material.

[0062] The obtained positive electrode material was used as the lithium ion battery positive electrode material for electrochemical performance testing, and the ratio of the electrode sheet was positive electrode material: acetylene black: PTFE (mass ratio) = 90:5:5. A CR2025 button cell was p...

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Abstract

The invention discloses a nanometer FeF3 / C composite positive electrode material, a preparation method thereof and a lithium ion battery. The method comprises the following steps: (1) putting reaction raw materials into a reaction kettle, filling the reaction kettle with protective gas, and sealing; wherein the reaction raw materials comprise an iron source and polytetrafluoroethylene; and (2) carrying out heat treatment on the sealed reaction kettle at the temperature of more than or equal to 400 DEG C to obtain the nano FeF3 / C composite positive electrode material. According to the invention, the property of sublimation of polytetrafluoroethylene at low temperature is utilized, and an iron source and a fluorine source are fully reacted by using a closed reaction kettle; the used polytetrafluoroethylene can provide a fluorine source and can be cracked to obtain the iron trifluoride composite positive electrode material with superfine nano-particles at the same time. The lithium ion battery positive electrode material provided by the invention has the advantages of high reversible specific capacity, excellent rate capability and good cycling stability.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and relates to lithium-ion battery positive electrode materials, in particular to a nano-FeF 3 / C composite positive electrode material and its preparation method and lithium ion battery. Background technique [0002] With the vigorous development of new energy vehicles, the lithium-ion battery industry has entered a stage of rapid development. The key materials that affect the performance of lithium-ion batteries mainly include positive electrode materials, negative electrode materials, and electrolytes. Among them, the positive electrode material is currently the main factor limiting battery performance, and it is also the main factor accounting for the high cost of lithium-ion batteries, which is close to 40%. [0003] Iron fluoride has the advantages of high specific capacity, high voltage and abundant natural resources, and has gradually become one of the most concerned ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/0525B82Y30/00
CPCH01M4/628H01M4/625H01M4/582H01M10/0525B82Y30/00H01M2004/028Y02E60/10
Inventor 谭强强夏青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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