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Method of producing thick sulphur cathodes for li-s batteries

A battery and cathode technology, applied in the field of Li-S batteries, can solve the problems of reducing the active surface and low utilization of high-load electrodes

Pending Publication Date: 2021-07-30
MONASH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In silicon anodes or sulfur cathodes, a fairly high proportion of binder is required to hold the electrodes together (5-30%), which effectively reduces a large portion of the active surface via the usual method of using a dissolved binder system ——This is the main reason for the low utilization of highly loaded electrodes

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  • Method of producing thick sulphur cathodes for li-s batteries
  • Method of producing thick sulphur cathodes for li-s batteries
  • Method of producing thick sulphur cathodes for li-s batteries

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Embodiment Construction

[0054] The following detailed description of the invention refers to the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the following description to refer to the same or like parts.

[0055] The present invention provides a method of producing thick sulfur cathodes which overcomes the limitations of prior art methods. The method described above overcomes the above drawbacks by forming 'bridging' bonds between particles. A key feature is that the electrodes produced by this method consist of particles not covered by the binder, resulting in an open structure with accessible sulfur and carbon, which enables the high discharge capacity of Li-S coin cells, where Sulfur load 4-18mgs / cm 2 . The sulfur particles and carbon particles of the produced cathode are connected by "bridging" bonds, making the resulting microstructure significantly different from that produced by state-of-the-art techniques in which the particl...

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Abstract

A method of producing Sulfur cathodes for Li-S batteries utilising dry mixing of constituents (sulphur, carbon and binder) or semi-dry mixing. The resultant structure binds the neighbouring particles without covering them, i.e. by attaching a few parts of a particle to other neighbouring particles provides a solution for the successful cycling of thick and ultra-thick sulfur cathodes. Such an approach provides a robust thick cathode where particles are strongly bonded with minimal surface coverage with the polymer providing sufficient room to expand during lithiation. Bridging bonds are formed within the cathodes.

Description

technical field [0001] The present invention relates to Li-S batteries, and more particularly to a method of producing thick sulfur cathodes with high electron mobility and ion mobility. Background technique [0002] Li-S batteries are considered as a potential replacement for rechargeable Li-ion battery technology. This is because the theoretical energy density of these batteries is 2600 Wh / kg, which is much larger than that of Li-ion batteries (~200 Wh / kg). An additional advantage of Li-S batteries is also due to the relative cheapness and abundance of all components: Li (metal-anode), sulfur and carbon (cathode). However, to achieve a battery-level energy content closer to that of a Li-ion battery, the amount of sulfur in the electrode must be increased, otherwise the battery cannot take advantage of its large theoretical energy density. Current production of sulfur cathodes in particular can provide >3-4mgs / cm 2 The approach with thicker sulfur cathodes has been ha...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/133H01M4/136H01M4/1397H01M4/58H01M10/052
CPCH01M4/136H01M4/364H01M4/58H01M2004/028H01M4/625H01M4/1397H01M4/622H01M10/052Y02E60/10H01M4/38H01M4/139H01M4/13H01M4/623H01M4/587H01M4/0404H01M4/382H01M10/4235H01M2300/0037H01M10/0567H01M10/0568H01M10/0569H01M4/5815H01M50/431H01M50/449
Inventor 马赫多赫特·沙伊巴尼迈纳克·马宗达
Owner MONASH UNIV
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