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Lithium sulphide battery and method of producing the same

A lithium sulfide and chemical power supply technology, applied in the manufacture of electrolyte batteries, electrode manufacturing, lithium batteries, etc.

Active Publication Date: 2008-02-20
JOHNSON MATTHEY PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] Use a mixture of lithium sulfide and elemental sulfur as a positive electrode depolarizer substance (electroactive material) and solve the problems inherent in using a material capable of reversibly intercalating lithium ions as a negative electrode (cycle life and production cost)

Method used

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  • Lithium sulphide battery and method of producing the same
  • Lithium sulphide battery and method of producing the same
  • Lithium sulphide battery and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Lithium sulfide, 98% (Sigma-Aldrich, UK) and sublimed sulfur, 99.5% (FisherScientific, UK) in a high-speed mill (Microtron MB550) at a mass ratio of 90:10 in an atmosphere of dry argon (moisture content 20 to 25 ppm) Grind down for 15 to 20 minutes. A ground mixture of lithium sulfide and sulfur was placed in a flask, and the electrolyte was added to the flask. A 1M solution of lithium trifluoromethanesulfonate (available from 3M Company, St. Paul, MN) in sulfolane (99.8%, GC standard, available from Sigma-Aldrich, UK) was used as the electrolyte. The mass ratio of liquid to solid is 10:1. The contents of the flask were mixed with a magnetic stirrer for 24 hours at room temperature. The liquid phase was separated from the insoluble solid phase by filtration. Analyze sulfur in the form of sulfides as well as total sulfur content. The total sulfur content in the initial electrolyte was also analyzed and considered.

[0063] Analysis results:

[0064] Total sulfur co...

Embodiment 2

[0074] An electrolyte solution of polysulfides (1M sulfolane solution of lithium trifluoromethanesulfonate) was prepared as described in Example 1, and the total sulfur content and sulfides were analyzed by chemical methods. Li 2 The mass ratio of S to S is 50:50.

[0075] Analysis results:

[0076] Total sulfur content in initial electrolyte, % mass ratio 25.8±0.1

[0077] In the electrolyte after reacting with a mixture of sulfur and lithium sulfide

[0078] Total sulfur content, % 31.8±0.1

[0079] In the electrolyte after reacting with a mixture of sulfur and lithium sulfide

[0080] Sulfide sulfur content, % 0.96±0.05

[0081] The composition and concentration of lithium polysulfide in the electrolyte after reacting with the mixture of sulfur and lithium sulfide were calculated by analyzing the results.

[0082] Calculation results:

[0083] Polysulfide Composition: Li 2 S 6.25

[0084] Concentration: 0.96%

Embodiment 3

[0086] An electrolyte solution of polysulfides (1M sulfolane solution of lithium trifluoromethanesulfonate) was prepared as described in Example 1, and the total sulfur content and sulfides were analyzed by chemical methods. Li 2 The mass ratio of S to S is 10:90.

[0087] analysis results;

[0088] Total sulfur content in initial electrolyte, % mass ratio 25.8±0.1

[0089] In the electrolyte after reacting with a mixture of sulfur and lithium sulfide

[0090] Total sulfur content, % 29.9

[0091] In the electrolyte after reacting with a mixture of sulfur and lithium sulfide

[0092] Sulfur content of sulfide, % 0.7

[0093] The composition and concentration of lithium polysulfide in the electrolyte after reacting with the mixture of sulfur and lithium sulfide were calculated by analyzing the results.

[0094] Calculation results:

[0095] Polysulfide Composition: Li 2 S 5.86

[0096] Concentration: 0.7%

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Abstract

There is disclosed a chemical source of electrical energy comprising a positive electrode (cathode) made of an electrically conductive material, a mixture of lithium sulphide and sulphur, a permeable separator or membrane, and a negative electrode (anode) made of an electrically conductive material or a material that is able reversibly to intercalate lithium ions, wherein an aprofic electrolyte comprising at least one lithium salt in at least one solvent is provided between the electrodes.

Description

technical field [0001] The present invention relates to electrochemical power engineering, especially chemical power sources (batteries), which include the use of oxidation-reduction pairs Li + / Li 0 The negative electrode (anode), using the oxidation-reduction pair S 0 / S -2 positive electrode (cathode), and a non-aqueous aprotic electrolyte. Embodiments of the invention also relate to the composition of positive depolarizer species. Background of the invention [0002] Various patents and published patent applications are referred to by explicit reference throughout this application. The patents and published patent applications mentioned in this application are incorporated by reference into the present disclosure to more fully describe the state of the art in the field to which this invention pertains. [0003] Electroactive materials that can be made into battery structures are called electrodes. In a pair of electrodes used in a battery, the electrode at the end ...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M4/02H01M4/04H01M4/133H01M4/136H01M4/58H01M10/052H01M10/058H01M10/0583H01M10/36
CPCH01M4/581H01M4/133Y02E60/122H01M2004/028H01M4/5815H01M4/0404H01M10/052H01M10/058H01M4/136H01M10/0583Y02E60/10Y02P70/50
Inventor 弗拉迪米尔·克洛什尼特斯叶莲娜·卡拉塞娃
Owner JOHNSON MATTHEY PLC
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