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Lithium/sulfur battery with increased capacity and associated production process

A battery, organic sulfur technology, used in lithium batteries, electrode manufacturing, battery electrodes, etc.

Pending Publication Date: 2021-01-26
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, despite the improvements in cycle stability obtained with prior art methods, there is still a need for batteries with high capacity and increased cycle rates

Method used

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  • Lithium/sulfur battery with increased capacity and associated production process
  • Lithium/sulfur battery with increased capacity and associated production process
  • Lithium/sulfur battery with increased capacity and associated production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0502] The preparation of embodiment 1-sulfur / CNT composite material

[0503] Sulfur / CNT composites (or "compounds") were prepared according to the method described in patent application WO 2016 / 102865.

[0504] Nanotubes (Graphstrength C100 from Arkema) and solid sulfur (50-800 microns) were introduced into the first stage of a Buss MDK 30 (L / D=15) co-kneader equipped with discharge extrusion screw and pelletizing device. in the hopper.

[0505] The nominal temperature values ​​in the co-kneader are as follows: Zone 1: 140°C; Zone 2: 130°C.

[0506] At the outlet of the die, the mixture consisting of 87% by weight of sulfur and 13% by weight of nanotubes is in the form of pellets obtained by granulation, which are cooled with air. The composite is characterized by a 1.55 g / cm 3 Density and 1.05g / cm 3 the apparent density. Another feature unique to this composite is the heat of fusion of sulfur (ΔH fus Values ​​are measured between 90 and 130°C). For starting sulfur, ΔH...

Embodiment 2

[0508] Example 2 - Preparation of the sulfur-based cathode of reference 1

[0509] A mixture of (S / CNT):carbon black:PVDF=60:30:10 was mixed in N-methyl-2-pyrrolidone to form an ink. Inks of semi-fluid consistency were deposited directly onto carbon paper in thin layers and dried at 60°C for 3 hours. The mass of sulfur active material was then calculated by evaluating the percent deposition according to the above report. The sulfur active mass value is usually in every 1cm 2 Between 0.8mg and 2mg.

[0510] Cell components: separator, cathode, dried under vacuum at 80 °C for 24 h, then assembled in a glove box.

Embodiment 3

[0511] Example 3 - Preparation of an electrode of reference 2 based on the active material of example 1 on aluminum foil

[0512] An ink was formed according to Example 2 and then deposited onto aluminum foil by a doctor blade type technique (eg doctor blade). The film thus obtained was dried in an oven at 120° C. for 20 minutes to obtain a cathode.

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Abstract

The invention relates to a battery comprising an anode, a separator, a cathode comprising a composite material based on sulfur and on carbon-containing material, and a catholyte comprising at least one organosulfur species contributing to the capacity of the cathode. The invention also relates to a process for producing such a battery.

Description

technical field [0001] The present invention relates to the field of batteries, and more particularly to high energy density and high power sulfur based batteries. In particular, the invention relates to batteries comprising composite materials comprising sulfur and carbon, which have improved performance. The invention also relates to methods of making such batteries. Background technique [0002] The development of rechargeable batteries with high energy density is of great technical and commercial significance. Such batteries have been equipped with portable electronic systems (such as Li-ion batteries) or hybrid vehicles (such as Ni-MH batteries). However, due to the increasing energy demand for electronics, transportation and network storage applications, there is a greater need for batteries with ever larger storage and discharge capacities. [0003] Sulfur-based batteries, such as lithium / sulfur (Li / S) batteries or Li / S batteries, are considered as promising altern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/60H01M4/62H01M10/052H01M10/054H01M10/0568
CPCH01M4/364H01M4/38H01M4/381H01M4/382H01M4/60H01M4/602H01M4/622H01M4/625H01M10/052H01M10/054H01M10/0568Y02E60/10Y02P70/50H01M4/62H01M4/13H01M4/136H01M4/0471H01M4/583H01M10/36H01M2300/0025
Inventor A.科兹亨科P-T.斯考伦P-G.施密特M.阿诺蒂
Owner ARKEMA FRANCE SA