Lis battery with low solvating electrolyte

Abstract

A lithium sulfur battery with a low solvating electrolyte at an amount of less than 2 [mu]l per mg sulfur. The electrolyte comprises dioxolane and hexylmethylether, as well as a Li salt, for example LiTSFi. The electrolyte is free from lithium nitrate, LiNO3.

Description

technical field [0001] The present invention relates to lithium sulfur (LiS) batteries with weakly solvated electrolytes. Background technique [0002] For liquid-containing lithium-sulfur (LiS) batteries, a common approach is to use electrolytes in which most of the electrochemically active sulfur, especially polysulfides, is dissolved. [0003] In U.S. Pat. No. 7,354,680 assigned to Sion Power Corporation, examples are disclosed, particularly disclosing 3 h 6 o 2 ), open-chain ethers such as dimethoxyethane (DME) and cyclic ethers such as LiN(CF 3 SO 2 ) 2 (Lithium salt of bis(trifluoromethane)sulfonylimide, also known as LiTFSI). In addition, the electrolyte also contains lithium nitrate LiNO as an additive 3 . This latter additive is generally believed to prevent rapid degradation of battery performance due to polysulfide migration. However, one of the problems with this technique is the generation of gas. [0004] Alternatives include poorly solvated electroly...

AI Technical Summary

Problems solved by technology

In this paper, a value close to 1 ml of electrolyte per gram of sulfur is shown to be necessary in order to compete with Li-ion technology on an energy density basis, but this low value is considered challenging

However, no practical technical solutions have been proposed so far

Especially for electrochemical cells with electrolyte quantities as low as 2ml / g electrolyte, or even lower, no satisfactory technical solutions have been found so far

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