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Structure of complex cathode using Li2S

A positive electrode and mixture technology, applied in the field of positive electrode structure, can solve problems such as the collapse of positive electrode structure

Inactive Publication Date: 2015-11-25
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, any of the above-mentioned techniques cannot fundamentally solve the collapse of the cathode structure caused by volume expansion and contraction during repeated charge / discharge cycles.

Method used

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  • Structure of complex cathode using Li2S
  • Structure of complex cathode using Li2S
  • Structure of complex cathode using Li2S

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 5

[0077] Examples 1 to 5 : Carbon and Li as active material 2 Compound of S

[0078] Because Li 2 S is sensitive to moisture, so perform dry compounding in moisture-controlled areas.

[0079] Will Li 2 S and conductive material for powder compounding. Will Li 2 S powder was crushed to an average particle diameter of 5 μm and Li 2 S powder and selected conductive materials were filled into dry composite devices at 86:14 wt%.

[0080] The treatment was performed at 300 revolutions per minute (RPM) for 6 minutes, maintaining a powder loading of 70% or greater (step 1). 6 g of additional conductive material and 20 g of the binder of choice were mixed together per 100 g of powder compounded by step 1 . 50 g of the mixture were mixed with 60 g of xylene solvent (step 2). Put the mixture of step 2 into a ball mill and mix for about 3 hours to obtain a slurry (step 3). The slurry of step 3 is applied to a set thickness (for example, 20 μm) on the current collector (step 4). ...

experiment example

[0097] Experimental example : Charge / discharge evaluation

[0098] By using a sulfur cathode fabricated according to the present disclosure, a lithium metal anode as a counter electrode, and a lithium bis(trifluoromethanesulfonyl)imide (LiTFSi) salt dissolved in tetraglyme dioxide ( A 2032 coin-type battery was manufactured using an electrolyte in tetraethyleneglycoldimethyletherdioxide (TEGDME / DIOX), and the discharge capacity was evaluated by repeating charging / discharging 100 times.

[0099] In the case of coin-type batteries using the electrodes of Example and Comparative Example 2, which were in a discharged state just after manufacture, the discharge capacity was tested after charging. In the case of the battery using the electrode of Comparative Example 1, the coin-type battery was in a charged state immediately after manufacture, and the discharge capacity was tested immediately.

[0100] Table 4

[0101]

[0102] The Examples showed a greater increase in disc...

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Abstract

A method for manufacturing a cathode of a lithium-sulfur secondary battery includes powder-complexing of Li2S as a mother particle and a conducting material as a daughter particle. The powder complexed and a binder are mixed in a solvent to form a mixture, additional conducting material is added to the mixture, and then the mixture is further mixed. The mixture is placed in a ball mill and then mixed for 0.2-24 hours in the ball mill to obtain a slurry. The slurry is coated on a collector to a thickness of 0.005-0.2 mm. The coated slurry is dried with hot air at a temperature higher than ambient.

Description

technical field [0001] This disclosure relates to Li 2 The positive electrode structure of S powder. More specifically, the present disclosure relates to Li covered with a conductive material complex (mixed, complex) 2 A positive electrode structure of S powder capable of maintaining the structure of the active material in a state of volume expansion, thereby improving lithium-sulfur batteries by preventing the collapse of the positive electrode structure caused by volume expansion after repeated charge / discharge cycles lifespan. Background technique [0002] Typically, the sulfur cathode is solid sulfur in the fully charged state and Li in the discharged state. 2 S. Li 2 The volume of S corresponds to 180% of the sulfur volume. The positive electrode structure of lithium-sulfur batteries collapses due to volume expansion and contraction caused by repeated charging and discharging. Conventional lithium-sulfur batteries use sulfur powder as the active material for the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136
CPCH01M4/136H01M4/1397H01M4/043H01M4/0471H01M4/0483H01M4/366H01M4/661H01M4/5815H01M4/622H01M4/625H01M4/0404Y02E60/10H01M4/58H01M4/62H01M10/05H01M10/052H01M2004/028
Inventor 李豪泽孙参翼
Owner HYUNDAI MOTOR CO LTD