Multipurpose ultralow-temperature charging-discharging lithium ion battery and a preparation method thereof

Abstract

The invention provides a multipurpose ultralow-temperature charging-discharging lithium ion battery and a preparation method thereof. The multipurpose ultralow-temperature charging-discharging lithium ion battery comprises a casing and a battery cell coiled or stacked inside the casing, wherein the positive electrode sheet current collector of the battery cell is an aluminum foil 15 to 30[mu]um thick; the two sides of the aluminum foil are coated with nano-scale lithium iron phosphate and a plurality of composite conductive agent and adhesive coatings; the negative electrode sheet current collector of the battery cell is a copper foil 6 to 20[mu]m thick; the two sides of the copper foil are coated with mesophase carbon microspheres or hard carbon or artificial graphite similar to hard carbon and having high charge-discharge performance, and a plurality of composite conductive agent and adhesive coatings; a highly air-permeable membrane is disposed between the positive electrode sheet and the negative electrode sheet and has a thickness between 20[mu]m and 30[mu]m; the casing is filled with a non-aqueous organic electrolyte; and the top side of the casing is provided with a positive electrode tab and negative electrode tab. The lithium ion battery can be normally discharged even at the temperature below 60 degrees centigrade, can be charged even at the temperature below 30 degrees centigrade or lower, and can be cyclically used for a long time at a low temperature.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a multi-purpose ultra-low temperature charge-discharge lithium-ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have entered thousands of households, and everyone enjoys the convenience and speed that lithium-ion batteries bring to life all the time. From mobile phones, PADs, computers, wearable devices, electric bicycles to electric cars, it is full of every aspect of daily life. In addition to the fields of daily life, lithium-ion batteries are used in power tools, communication base stations, solar street lights, off-grid energy storage power stations, troops, etc. [0003] Although lithium-ion batteries are widely used and easy to use, general lithium-ion batteries can only be used at a minimum temperature of minus 20 degrees, and cannot work normally at lower temperatures, let alone charge them below zero degree...

AI Technical Summary

Problems solved by technology

[0003] Although lithium-ion batteries are widely used and easy to use, general lithium-ion batteries can only be used at a minimum temperature of minus 20 degrees, and cannot work normally at lower temperatures, let alone charge them below zero degrees. Poor low-temperature performance severely limits its use area

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