Lithium battery electrolyte and lithium battery using electrolyte

Abstract

The invention discloses a lithium battery electrolyte comprising a quaternaries ionic liquid. The quaternaries ionic liquid comprises cations and anions. The cations are N-alkyl quaternary ammonium salts. The anions are one of halide salt ions, tetrafluoroborate anions, hexafluorophosphoric acid anions, bis (trifluoromethanesulfonyl) imide anions, lactic acid anions, methyl benzene sulfonate anions, acetyl imide anions, saccharin anions, amino acid anions, Sulfuric acid ester anions, succinic acid di-iso-octyl sulfonate anions, 4,5-dinitroimidazole anions, and 5-nitrotetrazolato anions. The quaternaries ionic liquid included in the electrolyte of the invention can be used as wide temperature battery catalyst, and enables the high temperature lithium battery to have consistent high performance discharge capability from normal temperature to high temperature. Meanwhile, the invention also discloses a lithium battery containing the electrolyte.

Description

technical field [0001] The invention relates to an electrolyte solution for a lithium battery and a lithium battery using the electrolyte solution, in particular to an electrolyte solution for a lithium / thionyl chloride battery or a lithium / manganese dioxide battery or a lithium / carbon fluoride battery and using the electrolyte liquid lithium battery. Background technique [0002] Lithium batteries are widely used in instrumentation, memory power supply, military, oil drilling and other fields due to their high energy, low self-discharge rate, long storage life and environmental protection. [0003] Taking lithium / thionyl chloride batteries as an example, the operating temperature range of ordinary lithium / thionyl chloride batteries is usually -40°C to +85°C, while high-temperature lithium / thionyl chloride batteries used in oil drilling can reach 150°C, 180°C or even 200°C high temperature. In the design of this type of high-temperature battery, in the past, the ability to...

AI Technical Summary

Problems solved by technology

In the design of this type of high-temperature battery, in the past, the ability to use at high temperature was achieved only by reducing the amount of active material on the basis of the design of ordinary batteries. In the actual discharge process, there will be a large difference in the discharge capacity at room temperature and high temperature. In some cases, there are even phenomena such as unstable discharge voltage platform and tailing at high temperatures, which seriously affect the performance of high-temperature lithium batteries.

[0004] Also in lithium batteries of other systems (such as lithium / manganese dioxide, lithium / carbon fluoride batteries), there is also the problem of inconsistent discharge performance in different temperature zones, which is manifested in low temperature (0°C) and high temperature (+60°C) discharge The time capacity and load voltage deviate greatly from normal discharge, which will affect the use of instruments and meters powered by such batteries

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