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Iron fluoride/carbon composite positive electrode material, preparation method thereof and lithium ion battery

A technology of lithium ion battery and positive electrode material, which is applied in the direction of positive electrode, battery electrode, secondary battery, etc., can solve the problem that the reversible specific capacity and cycle performance of electrode material need to be improved.

Inactive Publication Date: 2021-04-23
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the electrode materials obtained by the above scheme have to be improved in terms of reversible specific capacity and cycle performance.

Method used

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  • Iron fluoride/carbon composite positive electrode material, preparation method thereof and lithium ion battery

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Embodiment 1

[0058] This embodiment provides a ferric fluoride / carbon composite positive electrode material and a preparation method thereof, and the preparation method specifically includes the following steps:

[0059] (1) ferrocene is placed on the upper strata of the airtight reactor, and the lower floor is hydrofluoric acid and toluene; wherein, the mol ratio of ferrocene and hydrofluoric acid is 1:3; the mol ratio of carbon in ferrocene and toluene is 1:0.5.

[0060] (2) Fill the closed reaction kettle with argon gas, heat treatment and reaction at 120°C for 10 hours, and collect the powder after the reaction;

[0061] (3) The obtained powder is heat-treated in an argon atmosphere, heated at a rate of 5°C / min to 250°C for 4 hours, and FeF is obtained 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 p...

Embodiment 2

[0064] This embodiment provides a ferric fluoride / carbon composite positive electrode material and a preparation method thereof, and the preparation method specifically includes the following steps:

[0065] (1) Ferrocene is placed in the upper layer of the airtight reactor, and the lower floor is hydrofluoric acid and octafluorotoluene; wherein, the mol ratio of ferrocene to hydrofluoric acid is 1:0.5; the carbon in ferrocene and octafluorotoluene The molar ratio is 1:2.

[0066] (2) Fill the closed reaction kettle with nitrogen, heat treatment and reaction at 90°C for 15 hours, and collect the powder after the reaction;

[0067] (3) The obtained powder is heat-treated in a nitrogen atmosphere, heated at a rate of 1°C / min to 150°C for 10 hours, and FeF is obtained after cooling. 3 / C cathode material.

[0068] The obtained positive electrode material was used as the lithium ion battery positive electrode material for electrochemical performance testing, and the ratio of the...

Embodiment 3

[0070] This embodiment provides a ferric fluoride / carbon composite positive electrode material and a preparation method thereof, and the preparation method specifically includes the following steps:

[0071] (1) ferrocene is placed in the upper layer of the airtight reactor, and the lower layer is hydrofluoric acid and toluene; wherein, the molar ratio of ferrocene to hydrofluoric acid is 1:6; ferrocene and toluene and / or octafluorotoluene The molar ratio of middle carbon is 1:0.1.

[0072] (2) Fill the closed reaction kettle with helium, heat treatment and reaction at 150°C for 2 hours, and collect the powder after the reaction;

[0073] (3) The obtained powder is heat-treated in a helium atmosphere, heated at a rate of 30°C / min to 150°C for 1 hour, and FeF is obtained after cooling. 3 / C cathode material.

[0074] The obtained positive electrode material was used as the lithium ion battery positive electrode material for electrochemical performance testing, and the ratio o...

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Abstract

The invention discloses an iron fluoride / carbon composite positive electrode material, a preparation method thereof and a lithium ion battery. The method comprises the following steps of: (1) reacting steam of a fluorine source and steam of a carbon-containing organic matter with an iron source to prepare a precursor; and (2) carrying out heat treatment on the precursor to obtain the iron fluoride / carbon composite positive electrode material. A fluorine source and a carbon source are introduced through gas-phase reaction, the powder morphology is controlled, and the high-performance iron fluoride positive electrode material is obtained. The lithium ion battery positive electrode material provided by the invention has the advantages of high reversible specific capacity and good cycling stability.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and relates to a positive electrode material of a lithium ion battery, in particular to an iron fluoride / carbon composite positive electrode material, a preparation method thereof and a 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...

Claims

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Application Information

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