Lithium ion battery

Abstract

The invention relates to a lithium ion battery, which comprises at least one group of positive electrode layer and a negative electrode layer, wherein the positive electrode layer and the negative electrode layer are connected through a diaphragm, the positive electrode layer or the negative electrode layer comprises a current collecting body, an electrode material and a porous ion conducting polymer glue layer, the current collecting body is in a multi-seeping-hole electric conductive three-dimensional reticular structure, the electrode material is filled in the seeping holes of the current collecting body, the porous ion conducting polymer glue layer is coated on the current collecting body containing the electrode material. In the lithium ion battery, the positive electrode layer or the negative electrode layer comprises the current collecting body and the electrode material, in addition, the current collecting body realizes the three-dimensional reticular combination with the electrode material through a multi-seeping-hole framework of the current collecting body, so the utilization rate of the electrode material can be improved, and in addition, the lithium ion battery with higher specific energy density and capacity can be obtained.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular to a lithium ion battery. Background technique [0002] A conventional lithium ion battery includes at least one set of positive electrode layers and negative electrode layers, and the positive electrode layers and the negative electrode layers are connected by a separator. The manufacturing process of the electrode composite material of the positive and negative layers is as follows: coating the electrode material on the metal foil with a binder and forming it. The disadvantages of this process are: (1) Due to the use of more binders in the coating process, some electrode materials cannot be fully utilized, and electrode composite materials with high areal density cannot be obtained; (2) Electrode active materials and current collectors The bonding force between them is relatively poor, and the electrode peeling phenomenon is easy to occur, resulting in the reduction of ...

AI Technical Summary

Problems solved by technology

The disadvantages of this process are: (1) Due to the use of more binders in the coating process, some electrode materials cannot be fully utilized, and high surface density electrode composite materials cannot be obtained; (2) Electrode active materials and current collectors The bonding force between them is relatively poor, and the phenomenon of electrode peeling is prone to occur, resulting in the reduction of its mechanical reliability, and at the same time, the bending rate of the electrode composite material is limited.

Even with thinner electrode composite materials in conventional technology, small curvature changes cannot be achieved in practical processing and manufacturing processes

Images