Preparation method of sulfur/graphene nano composite material, positive electrode of lithium ion battery and lithium ion battery

A nano-composite material, lithium-ion battery technology, applied in battery electrodes, nanotechnology, nanotechnology and other directions, can solve the problems of poor cycle stability and electrical conductivity, and achieve the effect of good cycle stability, easy storage, and not easy to be oxidized

Active Publication Date: 2016-11-23
信骅(上海)器材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention aims to solve technical problems such as cycle stability and poor conductivity of elemental sulfur as an electrode material, and provides a non-toxic, non-polluting, simple preparation process, low cost, and high yield composite material preparation method

Method used

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  • Preparation method of sulfur/graphene nano composite material, positive electrode of lithium ion battery and lithium ion battery
  • Preparation method of sulfur/graphene nano composite material, positive electrode of lithium ion battery and lithium ion battery
  • Preparation method of sulfur/graphene nano composite material, positive electrode of lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of graphite oxide: weigh 5.0g graphite and 3.75g NaNO respectively 3 Put it into a 1L beaker, stir vigorously, slowly add 150mL of concentrated sulfuric acid, stir for 0.5 hours, then slowly add 20g of KMnO 4 , Added in 0.5 hours, and continued to stir for 20 hours, the viscosity of the reactant increased, and the stirring was stopped to obtain a paste-like purple-red substance. After standing for 5 days, slowly add 500mL deionized water and 30mL H 2 o 2 At this time, the color of the solution becomes more obvious bright yellow. After the solution is fully reacted, it is centrifuged and washed to obtain graphite oxide.

[0039] Hydrothermal process: Dissolve 70mg graphene oxide in 80mL deionized water, add 9mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 3 hours, and then transferred to a reaction kettle, and reacted at a constant temperature of 220 ° C for 20 hours to obtain a three-dimensional columnar reduced graphene oxide,...

Embodiment 2

[0042] The preparation method of graphite oxide is with embodiment 1.

[0043] Hydrothermal process: Dissolve 70mg of graphene oxide in 80mL of deionized water, add 9mL of concentrated sulfuric acid, ultrasonically disperse for 3 hours, then transfer it to a reaction kettle, and react at a constant temperature of 160°C for 30 hours to obtain a three-dimensional columnar reduced graphene oxide. Wash collection.

[0044] Composite process: drop 0.02g of hydroxylamine hydrochloride into 40mL of water, add 2.8g of potassium thiosulfate, add 16mg of three-dimensional columnar reduced graphene oxide to the above mixed solution, soak at 15°C for 3 days, and then transfer it to the reaction kettle , react at a constant temperature of 90° C. for 24 hours, wash the product, dry it in vacuum at 60° C. for 4 hours, and collect the sulfur / graphene nanocomposite material.

Embodiment 3

[0046] The preparation method of graphite oxide is with embodiment 1.

[0047] Hydrothermal process: Dissolve 70mg of graphene oxide in 80mL of deionized water, add 9mL of concentrated sulfuric acid, ultrasonically disperse for 3 hours, then transfer it to a reaction kettle, and react at a constant temperature of 180°C for 20 hours to obtain a three-dimensional columnar reduced graphene oxide. Wash collection.

[0048] Composite process: drop 0.02g of hydroxylamine hydrochloride into 25mL of water, add 2.7g of potassium thiosulfate, add 19mg of three-dimensional columnar reduced graphene oxide to the above mixed solution, soak at 30°C for 2 days, and then transfer it to the reaction kettle , react at a constant temperature of 90° C. for 24 hours, wash the product, dry it in vacuum at 60° C. for 4 hours, and collect the sulfur / graphene nanocomposite material.

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Abstract

The invention discloses a preparation method of a sulfur / graphene nano composite material, a positive electrode of a lithium ion battery and the lithium ion battery. The preparation method comprises the steps of a hydrothermal procedure and a compounding procedure. A monomer sulfur and three-dimensional reduced graphene oxide composite material obtained by the preparation method greatly represents the advantages of two-dimensional graphene compounding in the prior art; all groups of a monomer sulfur and three-dimensional reduced graphene oxide have very strong chemical bonding forces and the monomer sulfur is not easy to fall off, so that the stability of the material is greatly increased; the material is applied to a positive electrode material of the lithium ion battery and has the advantages of good circulating stability, high specific energy density and the like.

Description

technical field [0001] The invention relates to the technical field of inorganic nanomaterials, in particular to a preparation method of a sulfur / graphene nanocomposite material, a positive electrode of a lithium ion battery, and a lithium ion battery. Background technique [0002] The main problems existing in my country's current battery industry are serious environmental pollution and resource waste. As a new type of energy storage tool, lithium-ion batteries have high energy density, high output power, small self-discharge, excellent cycle performance, wide operating temperature range, and large discharge area. Stable and high volume utilization, as a green battery, it is gradually being used in various fields and has become one of the alternative energy sources. [0003] Based on the research on cathode materials for lithium-ion batteries, carbon materials are currently attracting attention, but their low capacity cannot solve the problem of large energy consumption. As...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/38H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 黄家锐王伟谷翠萍
Owner 信骅(上海)器材有限公司
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