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THAQ/graphene composite material and preparation method thereof as well as battery positive electrode and lithium ion battery

A composite material and graphene technology, applied in the field of electrochemistry, to achieve the effect of improving the molecular capacity of THAQ

Active Publication Date: 2014-01-15
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

THAQ (1,4,5,8-tetrahydroxy-9,10-anthraquinone) is an organic polyquinone compound, each molecule has six active potentials that can react with lithium ions, and its theoretical capacity is 855mAh / g, but the actually prepared THAQ (Acta Phys.-Chim.Sin., 2010, 26(1): 47-50) capacity is only 250mAh / g, far less than its theoretical capacity

Method used

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  • THAQ/graphene composite material and preparation method thereof as well as battery positive electrode and lithium ion battery
  • THAQ/graphene composite material and preparation method thereof as well as battery positive electrode and lithium ion battery

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preparation example Construction

[0025] The preparation method of this THAQ / graphene composite material, such as figure 1 As shown, including the following process steps:

[0026] S1. Add graphite oxide into water and sonicate for 0.5~3h to form a suspension with a concentration of 1.1~8.3g / L;

[0027] S2. Dissolve THAQ in an organic solvent, such as ethanol, isopropanol or tetrahydrofuran, configure a THAQ solution with a concentration of 1.2 to 1.9 g / L, and then pour the prepared THAQ solution into the suspension in step S1 , the mass ratio between THAQ and graphene oxide is 1 ~ 19:1, and vigorously stirred for 24 ~ 48h to prepare a mixed solution;

[0028] S3, reducing agent, such as, NaBH 4 、KBH 4 , hydrazine hydrate or ethylenediamine are slowly added to the mixed solution in step S2, stirred vigorously at room temperature for 24-48 hours, washed with water, filtered, and vacuum-dried at 60-100°C for 12-24 hours to obtain a THAQ / graphene composite material.

[0029] In step S1 of the preparation meth...

Embodiment 1~4

[0039] Embodiment 1~4 is the preparation method of THAQ / graphene composite material

Embodiment 1

[0041] (1) Preparation of graphite oxide:

[0042] Add 1g of graphite to a mixed acid solution consisting of 80ml of concentrated sulfuric acid and 15ml of concentrated nitric acid to form a mixed solution, keep the temperature of the mixed solution at 0°C and stir for 20 minutes;

[0043] Add 1 g of potassium permanganate to the mixture, and continue to keep the temperature of the mixture at 0°C and stir for 1 hour;

[0044] The mixture was heated to 85°C and kept for 1h;

[0045] Add deionized water to the mixture, and continue to incubate at 85°C for 1 hour; and

[0046] Add hydrogen peroxide to the mixture to remove potassium permanganate, filter with suction, wash the solid, and dry the solid to obtain graphite oxide.

[0047] (2) Add 200mg of graphite oxide into 100mL of water and sonicate for 0.5h to form a suspension,

[0048] (3) Dissolve 120 mg of THAQ in 100 mL of ethanol to obtain a THAQ solution, then pour the prepared THAQ solution into the suspension, and sti...

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Abstract

The invention discloses a THAQ / graphene composite material and a preparation method thereof as well as a battery positive electrode and a lithium ion battery, and belongs to the field of electrochemistry materials, wherein the THAQ / graphene composite material comprises 50-95wt% of THAQ and 5-50wt% of graphene. The THAQ / graphene composite material provided by the invention comprises grapheme with high conductivity, and thus electrons can be effectively and fast conducted to the THAQ molecular activity reaction center of the surface of the graphene, thereby being beneficial to the improvement on the exertion of the THAQ numerator capacity.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a THAQ / graphene composite material and a preparation method thereof. The invention also relates to a positive electrode of a battery using the THAQ / graphene composite material as the positive electrode active material, and a lithium ion battery using the positive electrode of the battery as the positive electrode. Background technique [0002] With the development of various new energy sources, the miniaturization of portable electronic devices and the extensive demand for large-capacity and high-power chemical power sources for electric vehicles. At present, most commercial lithium-ion batteries use inorganic cathode / graphite systems, and these cathode active materials are mainly lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide and mixed systems. Although this type of system has excellent electrochemical performance, it has many disadva...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/60H01M4/137H01M10/0525
CPCH01M4/13H01M4/60H01M4/625H01M10/0525Y02E60/10
Inventor 周明杰钟玲珑王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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