Preparation method for lithium ion battery

Abstract

The invention provides a preparation method for a lithium ion battery. The method comprises the following steps: 1) mixing an anode active material, a conductive agent, a binder and a fluorine-containing surfactant at a mass ratio of (80%-97%): (1%-10%): (1%-10%): (0.5%-10%) with a dissolvent, preparing the mixture into an anode sizing agent; coating the anode sizing agent onto an anode current collector, drying, rolling and slitting, thereby obtaining an anode pole piece; 2) mixing a cathode active material, a conductive agent, a binder and a fluorine-containing surfactant at a mass ratio of (80%-97%): (1%-10%): (1%-10%): (0.5%-10%) with a dissolvent, preparing the mixture into a cathode sizing agent; coating the cathode sizing agent onto a cathode current collector, drying, rolling and slitting, thereby obtaining a cathode pole piece; and 3) utilizing the anode pole piece, the cathode pole piece, the diaphragm and the electrolyte to assemble the lithium ion battery.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of batteries, and in particular relates to a preparation method of a lithium ion battery. [0003] 【Background technique】 [0004] Under the condition of the same volume, the higher the compaction density of the pole piece, the higher the capacity of the lithium-ion battery and the greater the energy density. However, high compaction density will directly affect the wettability of the electrolyte of the battery pole piece, resulting in poor liquid absorption and liquid retention performance, which in turn affects the migration rate of electrolyte ions in the pole piece, which not only limits the gram capacity of the active material , It will also have a negative impact on the efficiency, internal resistance and cycle performance of the battery. In addition, the high compaction density will also lead to poor liquid injection effect of the battery, increase the number of secondary liquid injections, a...

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Problems solved by technology

In addition, the addition of surfactants will also increase the viscosity of the electrolyte to a certain extent, which may have negative effects

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