Special modified negative pole material for thermal battery and preparation method thereof

Abstract

The invention discloses a special modified negative pole material for a thermal battery. The special modified negative pole material is powder material comprising LiSi alloy and molten salt eutectoid, the LiSi alloy is 95-98% by the weight, the molten salt eutectoid is 2-5% by weight, and the molten salt eutectoid is in a lithium chloride-potassium bromide-lithium fluoride system. The surface structure of the LiSi alloy is modified by adding the molten salt eutectoid, thereby further enhancing the compatibility between the LiSi alloy and isolation material for the thermal battery, expanding a diffusion channel of lithium ions and further improving the high-power transient output capability of the thermal battery. The special modified negative pole material is mainly applied in the high-power transient output thermal battery. In addition, the invention further discloses a preparation method of the special modified material for the thermal battery.

Description

technical field [0001] The invention belongs to the technical field of thermal batteries, and in particular relates to a special modified negative electrode material for thermal batteries; in addition, the invention also relates to a preparation method of the negative electrode material. Background technique [0002] The thermal battery is a kind of thermally activated reserve battery that uses the heating system of the battery itself to heat and melt the non-conductive solid-state salt electrolyte into an ionic conductor and enter the working state. The internal electrolyte of the thermal battery is a eutectic melt composed of two or more inorganic salts. At room temperature, the electrolyte is a non-conductive solid; when in use, the electric ignition head inside the battery is ignited by an external current, thereby igniting the heating inside the battery. materials, the internal temperature of the battery rises rapidly, causing the molten salt electrolyte to melt and con...

AI Technical Summary

Problems solved by technology

LiSi alloy has been widely used as the negative electrode material of thermal battery, but the mass percentage content of lithium in LiB alloy is as high as 68%-70% compared with the new material, and the mass percentage content of lithium in LiSi alloy is only 42.5%-45.5%. The amount of lithium is moderate, and the specific energy of the thermal battery is difficult to further improve

Moreover, the current application of LiB alloys is still in the laboratory stage, and many technical problems, such as pits in the initial voltage of LiB alloy low-temperature discharge, and long activation time, have not been completely resolved.