Lithium sulfur battery

A technology for lithium-sulfur batteries and battery casings, applied in the field of lithium-sulfur batteries, can solve problems such as insufficient and outdated electrode materials

Inactive Publication Date: 2013-04-17
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current research on current collectors is obviously insufficient, far behind the research on electrode materials

Method used

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Examples

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Embodiment 1

[0027] Preparation of carbon carrier: For the preparation method of ordered tubular mesoporous carbon in the present invention, see A.-H.Lu et al., Adv.Mater.2003,15,1602 and A.-H.Lu et al., J. Am. Chem. Soc. 2010, 132, 14152. Using mesoporous silicon SBA-15 as a template, mix SBA-15, trimethylbenzene, furfuryl alcohol and oxalic acid evenly, after heat treatment at 50-90°C, carbonize at 500-800°C for 3-8h, and then remove silicon with NaOH, Ordered tubular mesoporous carbon was obtained, showing the characteristics of thin-walled double channels.

[0028] The production of sulfur-based composite materials: mechanically mix elemental sulfur and carbon materials at a mass ratio of 1:1.7, then heat to 155°C under the protection of an inert gas and keep it warm for 6h, then raise the temperature to 300°C and keep it warm for 1h, and get S / C composites with S content of 50wt%.

[0029] Electrode sheet production: put a 35-micron-thick copper foil (Huizhou United Copper Foil) cur...

Embodiment 2

[0032] The preparation of the electrode material is the same as in Example 1. Different from embodiment 1 is the current collector:

[0033] Use 15 micron carbon-coated aluminum foil (Pinen Technology) as the current collector, rinse with acetone before use. Then the prepared slurry is coated on it, and the sheet is dried and punched to obtain an electrode sheet. The battery assembly and testing were the same as in Example 1. Charge and discharge at 0.2C, the specific capacity of the first discharge is 1021mAhg -1 , the specific capacity after 100 cycles is only 527mAhg -1 , the reversible capacity fades seriously, and the Coulombic efficiency is <85%.

Embodiment 3

[0035] The preparation of the electrode material is the same as in Example 1. Different from embodiment 1 is the current collector:

[0036] Use 1.59 mm thick nickel foam (Liyuan new material) as the current collector, and put it in acetone for ultrasonic cleaning for 10 minutes before use. Then the prepared slurry is coated on it, and the sheet is dried and punched to obtain an electrode sheet. The battery assembly and testing were the same as in Example 1. Charge and discharge at 0.2C, the first discharge specific capacity is 1097mA h g -1 , the specific capacity after 40 cycles is 585mA h g -1 , the specific capacity can be maintained at 577mA h g after 100 cycles -1 , the attenuation is serious in the early stage, and the cycle performance is basically stable after 40 charges and discharges.

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Abstract

The invention provides a lithium sulfur battery taking a transition metal material as a current collector, which comprises a positive electrode, a negative electrode, an electrolyte, a diaphragm and a battery case, wherein the positive electrode is composed of the transition metal material current collector, a sulfur-based composite applied onto the current collector, a conductive agent and a bonding agent. The transition metal current collector adopted in the battery can be corroded by the electrolyte or oxidized during the charging / discharging process, so as to release transition metal ions, which can rapidly react with an intermediate product Sn2- of the lithium sulfur battery to generate a transition metal sulfide precipitate and further prevent the Sn2- from escaping. Meanwhile, the transition metal sulfide has outstanding electrochemical activity, can improve utilization rate of active sulfur, and further improves reversible capacity. Therefore, due to use of the transition metal current collector, the performance of the lithium sulfur battery is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, in particular to a current collector modified lithium-sulfur battery. Background technique [0002] With the emergence and development of electric vehicles, people have put forward higher and higher requirements for power batteries that can provide continuous energy. Lithium-sulfur batteries use metal lithium as the negative electrode and elemental sulfur as the positive electrode, and its theoretical energy density is as high as 2600W h kg -1 , is more than 5 times that of traditional lithium-ion batteries, so it is considered to be one of the most attractive power battery systems at present. However, due to the low utilization rate of active sulfur, low Coulombic efficiency, and serious reversible capacity fading of lithium-sulfur batteries, their practical applications are greatly limited. The root cause of these problems lies in the electrical insulation of elemental sulfur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/66
CPCY02E60/10
Inventor 李文翠陆安慧韩飞李多
Owner DALIAN UNIV OF TECH
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