Preparation method of ultralow-temperature electronic cigarette lithium ion battery

Abstract

The invention discloses a preparation method of an ultra-low temperature flexible package electronic cigarette lithium ion battery, which comprises the following steps: winding a prepared positive pole part, a negative pole part and an isolating membrane together by a winding machine to form a roll core, the used PE membrane with the diaphragm thickness of 20 mu m having the porosity of 48%; and putting the obtained roll core into an aluminum-plastic film, injecting an electrolyte into the battery cell after baking, and then performing formation, secondary sealing and capacity grading on the prepared battery cell to obtain the lithium ion battery. According to the invention, the positive electrode adopts the graphene modified lithium cobalt oxide material; the graphene can be uniformly dispersed among lithium cobalt oxide positive electrode material particles, and the graphene on the surface of the lithium cobalt oxide positive electrode plays a role in fixing O atoms on the surface ofthe material, so that the structure of the material is stabilized, the decomposition of an electrolyte on the surface of the lithium cobalt oxide positive electrode is inhibited, and the cycle performance, especially the low-temperature cycle performance, of the material is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery preparation and relates to a preparation method of an ultra-low temperature electronic cigarette lithium ion battery. Background technique [0002] Since the advent of lithium-ion batteries in the 1990s, because of their advantages such as high energy density, good cycle life, and no memory effect, they have been continuously promoted and applied in 3C digital products, energy storage power stations, new energy vehicles, aerospace and other fields. , becoming the most widely used battery. However, lithium-ion batteries also have their own defects. The discharge capacity of the battery under low temperature conditions is significantly lower than that at room temperature, especially in ultra-low temperature (-40°C) environments. It tends to condense, the conductivity decreases, and the internal resistance of the battery increases. It is difficult for lithium ions to be embedded in the negative el...

AI Technical Summary

Problems solved by technology

However, lithium-ion batteries also have their own defects. The discharge capacity of the battery under low temperature conditions is significantly lower than that at room temperature, especially in ultra-low temperature (-40°C) environments. It tends to condense, the conductivity decreases, and the internal resistance of the battery increases. It is difficult for lithium ions to be embedded in the negative electrode during charging, and metal lithium deposits are formed on the surface, making the battery unusable. In severe cases, it will also form a safety hazard, causing safety problems such as combustion and explosion

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