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Lithium terephthalate-graphene compound as well as preparation and application thereof

A technology of lithium terephthalate and terephthalic acid, which is applied in the field of lithium terephthalate-graphene composites and its preparation and application, can solve the problems of reversible capacity fading and poor cycle performance, and achieve avoidance of polymerization, The effect of excellent electrochemical performance and simple preparation method

Active Publication Date: 2017-01-11
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its cycle performance is not good, and its reversible capacity decays sharply to about 234mAhg after 50 cycles -1 (M. Armand, S. Grugeon, H. Vezin, S. Laruelle, P. Ribiere, P. Poizot and J. M. Tarascon, Nature Mater., 2009, 8, 120; H. Zhang, Q. Deng, A. Zhou, X. Liu and J. Li, J. Mater. Chem. A, 2014, 2, 5696)

Method used

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  • Lithium terephthalate-graphene compound as well as preparation and application thereof
  • Lithium terephthalate-graphene compound as well as preparation and application thereof
  • Lithium terephthalate-graphene compound as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Add 0.85g LiOH·H 2 O was dissolved in 25 mL of deionized water, 1.66 g of terephthalic acid was dissolved in 50 mL of ethanol, and then stirred at 70 °C, the terephthalic acid solution was gradually added dropwise to the LiOH solution. After continuing to reflux and stir for 8 hours to stop heating, the solution was centrifuged, and the obtained precipitate was washed with ethanol and deionized water with a volume ratio of 1:1, and then dried in a vacuum oven at 70°C for 12 hours to obtain white lithium terephthalate (PTAL ).

[0032] (2) 0.4g of natural graphite powder and 0.35g of NaNO 3 into a three-neck flask with a stirrer chip, then slowly drop 30mL of 98% H 2 SO 4 . The mixture was stirred under ice-water bath for 1 hour. Then, 1.8 g of potassium permanganate (purity 99%) was gradually added and stirred slowly for 3 hours. The thus formed mixture was reacted at room temperature for seven days. Subsequently, 40 mL of 5% H 2 SO 4 The aqueous solution w...

Embodiment 2

[0042] (1) 0.90g LiOH·H 2 O was dissolved in 25 mL of deionized water, 1.66 g of terephthalic acid was dissolved in 50 mL of methanol, and then stirred at 60 °C, the terephthalic acid solution was gradually added dropwise to the LiOH solution. Continue to reflux and stir for 8 hours, stop heating, centrifuge the solution, wash the obtained precipitate with methanol and deionized water with a volume ratio of 1:1, and then dry it in a vacuum oven at 60°C for 12 hours to obtain white lithium terephthalate.

[0043] (2) 0.4g of natural graphite powder and 0.35g of NaNO 3 into a three-neck flask with a stirrer chip, then slowly drop 30mL of 98% H 2 SO 4 . The mixture was stirred under ice-water bath for 1 hour. Then, 1.8 g of potassium permanganate (purity 99%) was gradually added and stirred slowly for 3 hours. The thus formed mixture was reacted at room temperature for seven days. Subsequently, 40 mL of 5% H 2 SO 4 The aqueous solution was added to the solution and stirre...

Embodiment 3

[0047] (1) 0.95g LiOH·H 2 O was dissolved in 25 mL of deionized water, 1.66 g of terephthalic acid was dissolved in 50 mL of N,N-dimethylformamide, and then stirred at 80 °C, the terephthalic acid solution was gradually added dropwise to the LiOH solution. Continue to reflux and stir for 8 hours, stop heating, centrifuge the solution, wash the obtained precipitate with N,N-dimethylformamide and deionized water with a volume ratio of 1:1, and then dry it in a vacuum oven at 80°C for 12 hours to obtain a white of lithium terephthalate.

[0048] (2) 0.4g of natural graphite powder and 0.35g of NaNO 3 into a three-neck flask with a stirrer chip, then slowly drop 30mL of 98% H 2 SO 4 . The mixture was stirred under ice-water bath for 1 hour. Then, 1.8 g of potassium permanganate (purity 99%) was gradually added and stirred slowly for 3 hours. The thus formed mixture was reacted at room temperature for seven days. Subsequently, 40 mL of 5% H 2 SO 4 The aqueous solution was ...

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Abstract

The invention belongs to the field of lithium ion battery materials and discloses a lithium terephthalate-graphene compound as well as preparation and application thereof. The preparation method comprises the following steps: adding terephthalic acid into a solvent, stirring and dissolving uniformly, then dropwise adding LiOH solution, refluxing, stirring and reacting, removing the solvent after reaction is finished, and cleaning and drying a product to obtain lithium terephthalate; dispersing lithium terephthalate and graphene into a solvent together, stirring and mixing uniformly, then carrying out ultrasonic treatment to obtain dirty solution, then heating the dirty solution to 400-500 DEG C in inert atmosphere, and carrying out heat treatment for 4-6 hours, so that the lithium terephthalate-graphene compound is obtained. The prepared product has a compound characteristic structure that a box structure of lithium terephthalate is taken as a matrix and flake graphene is uniformly embedded into the matrix and has excellent electrochemical properties when serving as a lithium ion battery anode material.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to a lithium terephthalate-graphene compound and its preparation and application. Background technique [0002] In recent years, lithium-ion batteries (LIBs) have been widely used in portable electronic devices, electric vehicles, and hybrid electric vehicles due to their high rate capability, long cycle life, and good safety. However, as an important part of LIBs, transition metal oxides, carbonaceous materials, tin-based materials, and silicon-based materials are generally used as anode materials. Since these anode materials involve high-temperature processing and are non-renewable resources, they cannot be used as renewable and sustainable electrode materials for lithium-ion batteries. Therefore, organic electrode materials with advantages of safety, flexibility, sustainability, and environmental friendliness have been widely explored for LIBs. [0003] ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/60H01M4/62H01M10/0525
CPCH01M4/364H01M4/60H01M4/625H01M10/0525Y02E60/10
Inventor 曾荣华南俊民舒东
Owner SOUTH CHINA NORMAL UNIVERSITY
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