Lithium battery with polymer-coated sulfur/carbon composite material as anode

A carbon composite material and polymer technology, applied in the field of electrochemistry, can solve the problems of unsatisfactory polymer conductivity, poor retention, poor stability, etc., and achieve excellent high-rate charge and discharge performance, improve energy density, and inhibit dissolution. Effect

Inactive Publication Date: 2012-05-09
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a nutshell, these technologies mostly use the adsorption or coating of carbon materials to stabilize the material structure and improve the utilization rate of sulfur. However, when charging and discharging at a higher rate, the state of low specific capacity and poor stability has not been significantly improved.
Patent CN201010255445.6 disclose

Method used

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  • Lithium battery with polymer-coated sulfur/carbon composite material as anode
  • Lithium battery with polymer-coated sulfur/carbon composite material as anode
  • Lithium battery with polymer-coated sulfur/carbon composite material as anode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Preparation of polyaniline-coated sulfur / conductive carbon black composites and electrode sheets

[0031] Take by weighing 5.0 gram of sublimated sulfur and 5.0 gram of porous conductive carbon black (Ketjenblack EC600JD) and put into the agate ball mill jar, place the ball mill on the planetary ball mill after the agate ball mill jar is filled with high-purity argon in the glove box, the time is 2 hours, The rotational speed is 300 revolutions per minute. Then, the resulting mixture was transferred to a sealed container filled with an inert gas (argon), heat-treated in a muffle furnace, raised to 155° C. at a heating rate of 5° C. / min, and kept at this temperature for 12 hours. Obtain sulfur / conductive carbon black composite material.

[0032] Accurately weigh 4.0 g of the above-prepared sulfur / conductive carbon black composite material, put it into a three-necked flask filled with 250 ml of deionized water and 50 ml of acetone mixed solvent, ultrasonically and magneti...

Embodiment 2

[0037] The quality of step (1) sublimated sulfur and porous conductive carbon black (Ketjenblack EC600JD) in Example 1 was determined as 7.0 grams and 3.0 grams respectively, and the others were the same as in Example 1. Under the current density of 1.6 amps / g, the first week charge and discharge capacity test results are as follows: Figure 4 shown.

Embodiment 3

[0039] In embodiment 1 (1) step porous conductive carbon black (Ketjenblack EC600JD) is changed into microporous superconducting carbon black (BP2000), the electrolyte in embodiment 1 (4) step electrolyte is 1.0 mol / liter The lithium bis(trifluoromethylsulfonyl)imide is changed into the lithium trifluoromethanesulfonate solution of 1.0 mol / liter of electrolyte, and others are the same as in Example 1. Under the current density of 1.6 amps / g, the first week charge and discharge capacity test results are as follows: Figure 5 shown.

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Abstract

The invention relates to a lithium battery with a polymer-coated sulfur/carbon composite material as an anode. According to the invention, sublimed sulfur or sulfur powder and a conductive carbon material are mixed according to a mass ratio of 3:7-8:2; the mixture is subject to ball milling, such that a sulfur/carbon composite material is obtained; the composite material is dispersed in a solution, and a polymer monomer is added to the solution; under a low temperature and the protection of inert gas, an oxidizing agent is added for initiating polymerization; the material is centrifuged, washed, and dried; the obtained polymer-coated elemental sulfur/carbon composite material, acetylene black and PTFE are mixed; a dispersant is added to the mixture, and the mixture is sufficiently mixed by stirring; the mixture is rolled into a sheet, and is vacuum-dried under a temperature of 55 DEG C, such that an electrode sheet is obtained. The prepared electrode sheet is adopted as an anode, metal lithium is adopted as a cathode, and a solvent type organic solution system containing 0.2mol/L of a waterless lithium nitrate additive is adopted as electrolyte, and a battery is assembled. With the electrode material, the assembled lithium battery is advantaged in high specific capacity, good circulation stability, and excellent heavy-current charge/discharge performances. The preparation method is advantaged in simple process, low cost, and good repeatability.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to an electrode material preparation technology for preparing a lithium battery, in particular to a lithium battery in which a polymer-coated sulfur / carbon composite material prepared by in-situ polymerization is used as a positive electrode and a preparation method thereof. Background technique [0002] With the rapid development of transportation, communication and information industries, emerging products such as electric vehicles, notebook computers and mobile communication tools have put forward higher requirements for chemical energy. Lithium-sulfur battery is a new type of battery system with high energy density. It usually uses elemental sulfur or sulfur-containing composite materials as the positive electrode and metal lithium as the negative electrode. Its theoretical specific capacity is 1675 mAh / g, and its theoretical energy density is as high as 2600 watts. Hours / kg (J. ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M4/134H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 高学平李国春李国然叶世海
Owner NANKAI UNIV
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