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Cathode for lithium sulfur battery and method for preparing thereof

A technology for lithium-sulfur batteries and positive electrodes, which is applied in the field of positive electrodes for lithium-sulfur batteries and its preparation, and can solve problems such as limitations

Inactive Publication Date: 2015-05-06
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are limitations in expressing a charge / discharge capacity that is as stable and as high as the actual demand level

Method used

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  • Cathode for lithium sulfur battery and method for preparing thereof
  • Cathode for lithium sulfur battery and method for preparing thereof
  • Cathode for lithium sulfur battery and method for preparing thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0043] In the initial stage of lithium-sulfur batteries, the positive electrode is S (S 8 ) and the anode is lithium metal (Li). When starting to discharge, S 8 Receive Li and generate lithium polysulfide Li 2 S 8 . Li 2 S 8 Participate in the reaction and dissolve in the electrolyte at the same time. At the end of discharge, Li 2 S remains at the positive pole. Relative to the electrolyte (1M LiTFSI in TEGDME), Li 2 S 8 The saturated solubility is about 6M.

[0044] First, in the reaction [42S+6Li 2 S=6Li 2 S 8 ] in the preparation of Li according to the stoichiometric ratio of 6M 2 S 8 (additional active substance) liquid. In TEGDME the solvent was 1M LiTFSI and stirring was carried out at 50°C for 12 hours. Hereinafter, where the dissolved Li 2 S 8 The electrolyte will be referred to as "PS electrolyte".

[0045] If Li is added in an amount of 10 μmol 2 S 8 The liquid is added to the electrolyte (performed in a small cell experiment used to evaluate th...

preparation example 2

[0048] Preparation of 0.25M, 1M and 3M PS (Li 2 S 8 ) electrolyte.

[0049] Mix 10ml of 1M LiTFSI in TEGDME / DIOX (1 / 1) with 0.2MLiNO 3 Li in solution 2 A mixture of S (45.95 g / mol) and S (32.06 g / mol) powders was mixed to provide a stoichiometric composition. The stoichiometric composition is based on the reaction formula (7xS+xLi 2 S=xLi 2 S 8 ). After stirring at 50°C for 12 hours, the powder did not dissolve for the 3M PS electrolyte. The solubility is determined to be lower because DIOX is mixed in the solvent and LiTFSI and LiNO 3 Salt is already dissolved in the electrolyte.

[0050] battery assembly

[0051] Case 1. (Add PS electrolyte, 1M)

[0052] The positive electrode was prepared such that the mixing ratio of fine sulfur powder: VGCF (vapour-grown carbon fiber): PvdF (polyvinylidene fluoride) was 6:2:2 and the sulfur loading was 4.0 mg / cm 2 .

[0053] The diaphragm uses a PE diaphragm and a carbon sheet (conductive structure) and is used as a reaction ...

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Abstract

Disclosed is a cathode for a lithium sulfur battery comprising a sulfur-containing active material, an electrolyte in which a lithium salt is dissolved in an ether-based solvent, and an additional liquid active material in the form of Li2Sx (0<x≰9) dissolved in the electrolyte, and a lithium sulfur battery using the same. The lithium sulfur battery of the present invention has a loading amount of cathode sulfur that is increased to at least about 13.5 mg / cm2 and a structural energy density that is increased from about 265 Wh / kg to at least about 355 Wh / kg as compared with a conventional battery.

Description

technical field [0001] The present invention relates to a positive electrode (cathode, cathode) for a lithium-sulfur battery and a method for preparing the same, and more particularly, to a method having a maximum per weight by using an electrolyte in which an additional active material is dissolved. Lithium-sulfur batteries with high energy density. Background technique [0002] As the technology of portable electronic devices advances, demands for lightweight and high-capacity batteries have increased. As a secondary battery meeting this demand, a lithium-sulfur battery using a sulfur-based material as a positive electrode active material has been developed. [0003] This lithium-sulfur battery is a secondary battery that uses (1) a sulfur-based material having an S-S bond (sulfur-sulfur bond) as a positive electrode active material and (2) in which an alkali metal such as lithium or a metal ion such as lithium ion occurs The intercalated or deintercalated carbon-based m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/052
CPCH01M4/13H01M4/362H01M4/5815H01M10/052H01M4/38H01M4/382H01M4/663H01M10/0568H01M2300/0028H01M10/0569Y02E60/10H01M4/136H01M10/39H01M4/58
Inventor 金元根李允智李俊基
Owner HYUNDAI MOTOR CO LTD