Lithium ion battery core and preparation method thereof

Abstract

The invention discloses a lithium ion battery core and a preparation method thereof. The lithium ion battery core comprises a current collector, anode or cathode material, carbonizing medium, diaphragm composite material and porous polymer glue. The preparation method comprises the following steps: mixing and filling bonding agent, electrode material and conducting agent in the multi-penetration hole of the current collector; drying, die-casting and calcining; coating the porous polymer glue on the surface of the current collector after cooling; drying to obtain anode or cathode composite material; coating the porous polymer glue on the surface of the diaphragm composite material; drying; overlapping and casting the porous polymer glue, the anode or cathode composite material and the porous polymer glue to obtain the lithium ion battery core. Through adopting the above manner, according to the lithium ion battery core and the preparation method thereof provided by the invention, the cyclical stability is improved, the lithium ion battery core has better mechanical property and bending-resistant performance, the stripping phenomenon of electrode material is efficiently retarded, the communication and the electric conduction between electrode materials and isolated layers are promoted, each surface of the electrode layer is well protected, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a lithium-ion battery cell and a preparation method thereof. Background technique [0002] The lithium-ion battery cell includes at least one layer of positive electrode material and negative electrode material. The positive electrode material and the negative electrode material are connected by a separator, which is generally obtained by coating the electrode material on the metal foil of the current collector through an adhesive. The disadvantage of this preparation method is that the bonding surface between the electrode material and the traditional current collector is relatively weak, the mechanical reliability is reduced, and the two are prone to separation, which limits the bending rate of the electrode material. Electrode materials cannot be fully utilized, and high-density composite materials cannot be obtained, resulting in reduced capacity, increased inter...

AI Technical Summary

Problems solved by technology

Even with thinner electrode composite materials, small curvature changes cannot be achieved, limiting the structure and shape of battery products such as rolled batteries

The mutual constraints of these existing technologies have caused parameters such as internal resistance, life, energy density and capacity of batteries in the prior art to be substantially improved.

Images