A lithium-ion battery negative electrode based on lithium tetrathiofulvalene dicarboxylate and preparation method thereof

A technology of lithium tetrathiofulvalene dicarboxylate and tetrathiofulvalene dicarboxylic acid, applied in the field of lithium ion battery materials, can solve problems such as complicated preparation process, and achieve good conductivity and excellent cycle stability , the effect of conjugation

Active Publication Date: 2021-11-30
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

People such as Walker used 4,4-toluene dicarboxylate lithium as lithium ion battery negative pole, and this negative pole has 200 mAh / g reversible specific capacity, but this material preparation process is complicated (Journal ofMaterials Chemistry, 2011, 21, 1615- 1620.)

Method used

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  • A lithium-ion battery negative electrode based on lithium tetrathiofulvalene dicarboxylate and preparation method thereof
  • A lithium-ion battery negative electrode based on lithium tetrathiofulvalene dicarboxylate and preparation method thereof
  • A lithium-ion battery negative electrode based on lithium tetrathiofulvalene dicarboxylate and preparation method thereof

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Experimental program
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Embodiment 1 4

[0037] The preparation of embodiment 1 tetrathiofulvalene dicarboxylate methyl ester

[0038] Add 10 mL (0.165 mol) of carbon disulfide and 8.4 g (0.1 mol) of methyl propiolate as raw materials into 80 mL of anhydrous tetrahydrofuran, then add 20.2 g (0.1 mol) of catalyst tributylphosphine, under argon protection, in Reaction at -76 °C for 4 hours, vacuum drying at 80 °C for 6 hours after suction filtration, the crude product was chromatographed with a mixed solvent of cyclohexane and dichloromethane with a volume ratio of 2:1 to obtain tetrathiofulvalene di Methyl carboxylate 2.1 g.

Embodiment 2 4

[0039] The preparation of embodiment 2 tetrathiofulvalene dicarboxylic acids

[0040] Add 0.64 g (2 mmol) methyl tetrathiofulvalene dicarboxylate and 0.2 g (5 mmol) sodium hydroxide to 40 mL equal volume tetrahydrofuran and water mixed solvent, react at 90 °C for 4 hours, Cool to room temperature, remove THF by rotary evaporation, add aqueous hydrochloric acid to adjust the pH to 5, collect the precipitate by filtration, and vacuum-dry at 100 °C for 24 hours to obtain 0.54 g of tetrathiofulvalenedicarboxylic acid.

Embodiment 3 4

[0041] The preparation of embodiment 3 tetrathiofulvalene dicarboxylate lithium

[0042] Add 0.05 g (2.1 mmol) of lithium hydroxide to 20 mL of deionized water, then add 0.29 g (1 mmol) of tetrathiofulvalene dicarboxylic acid into the lithium hydroxide aqueous solution, stir at room temperature for 2 hours, and then The solution was freeze-dried for 24 hours to obtain 0.28 g of lithium tetrathiofulvalene dicarboxylate.

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a lithium ion battery negative electrode based on lithium tetrathiofulvalene dicarboxylate and a preparation method thereof. The present invention first uses carbon disulfide and methyl propiolate as raw materials, synthesizes methyl tetrathiofulvalene dicarboxylate under the catalysis of tributylphosphine, and then obtains tetrathiofulvalene dicarboxylate through hydrolysis, acidification and lithiation. lithium carboxylate. The prepared lithium tetrathiofulvalene dicarboxylate, conductive agent and binder are mixed and dispersed in N-methylpyrrolidone, then coated on copper foil, dried and sliced ​​to obtain tetrathiofulvalene dicarboxylate Lithium carboxylate negative electrode. The obtained negative electrode has the advantages of high discharge specific capacity, good cycle stability and the like.

Description

technical field [0001] The invention discloses a lithium-ion battery negative electrode based on lithium tetrathiofulvalene dicarboxylate and a preparation method thereof, belonging to the technical field of lithium-ion battery materials. Background technique [0002] Lithium-ion battery technology is considered to be one of the most ideal energy storage and conversion technologies. Lithium-ion batteries have the advantages of high energy density, light weight, and long cycle life, and are widely used in devices such as mobile phones, notebook computers, and digital cameras. With the development of electronic equipment and electric vehicles, the lithium-ion battery market has put forward higher requirements for safety, environmental protection and sustainability. The development of new electrode materials is of great significance to the development of lithium-ion batteries. [0003] Organic electrode materials are a new type of electrochemical energy storage materials, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/60H01M4/36H01M10/0525
CPCH01M4/362H01M4/60H01M10/0525Y02E60/10
Inventor 陈栋阳胡伟康林梅金
Owner FUZHOU UNIV
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