Electrolyte solution and lithium-ferrous disulfide battery containing same

Abstract

The invention discloses electrolyte solution used for a lithium-ferrous disulfide battery. The electrolyte solution comprises electrolyte and an electrolyte solvent, wherein the electrolyte comprises bistrifluoromethanesulfonimide lithium salt, the electrolyte solvent comprises at least one of 1, 3-dioxolame, glycol dimethyl ether and propylene carbonate. The electrolyte solution provided by the invention is formed by the combination of the specific electrolyte and the electrolyte solvent, is mainly used in the lithium-ferrous disulfide battery, is low in cost and can solve the problem that the existing lithium-ferrous disulfide battery cannot discharge electricity or has low discharge capacity at below 40 DEG C, so as to remarkably improve the discharge performance of the lithium-ferrous disulfide battery at below 40 DEG C. Furthermore, the invention also discloses the lithium-ferrous disulfide battery containing the lithium-ferrous disulfide battery, and the lithium-ferrous disulfide battery has good discharge performance.

Description

technical field [0001] The invention relates to an electrolyte and a lithium battery containing the electrolyte, in particular to an electrolyte for a lithium-ferrous disulfide battery and a lithium-ferrous disulfide battery made from the electrolyte. Background technique [0002] Lithium-ferrous disulfide batteries are developing rapidly. The primary batteries have large specific energy, green environmental protection, long storage life and broad market prospects. Especially in the development of high-power electronic appliances such as digital cameras, portable monitoring instruments for medical use, and outdoor product applications. However, all such batteries currently on the market have the problem of poor low temperature performance. [0003] Replacing lithium trifluoromethanesulfonate (PFM-LI) with lithium iodide (LiI) is discussed in U.S. Patent Publication No. US5514491 to improve battery electrical performance and reduce cost, and the electrolyte solvent includes ...

AI Technical Summary

Problems solved by technology

[0004] U.S. Patent Publication No. US20060046154 discusses improved low-temperature discharge performance using an electrolyte comprising an electrolyte of lithium iodide (LiI) and lithium trifluoromethanesulfonate (PFM-LI), but shows near the start of high-power discharge at low temperatures sharp drop in voltage

[0005] U.S. Patent Publication No. US7722988B2 discloses that 0.5 mol / L LiI is dissolved in 60-70 volume % 1,3-dioxolane (DIOX) and one or more ether mixtures such as ethylene glycol dimethyl ether (DME) The battery in the electrolyte increases the low-temperature discharge capacity without affecting the discharge capacity at room temperature, but discharges at 200mA at a temperature of -40°C or below, and only releases about 30% of the capacity

[0006] Chinese Patent Publication No. 102751499A mentions that by adding better conductive materials to the positive electrode and adding additives such as N,N-dimethyltrifluoroacetamide to the electrolyte, the lithium-ferrous disulfide battery can be used in a wider range of high 1. It has good discharge performance in a low temperature environment. It is mentioned in the third preferred embodiment that it can release 90% of the capacity at a low temperature of -40°C (compared with the normal temperature discharge capacity), but it cannot release 100% of the capacity.