Other

Qiangli Gao

Xin Hui Zhang

Haitao Xu

Yanchuan Guo

Ying Cui

Yuanfen Hu

Rongfu Li

Keli Chen

The invention relates to a composite gel polymer Li-ion battery and its producing method. The Li-ion battery cell includes a three-layer composite layer of positive electrode current collector, positive electrode active material and gel polymer electrolyte obtained by a two-layer one-step coating process; a two-layer composite layer of negative electrode current collector and negative electrode active material obtained by a single-layer coating process or a negative electrode two-layer composite layer coated with a little polyurethane adhesive(s) on the surface. The gel polymer Li-ion battery cell is obtained by laminating the resultant two composite layers. The gel polymer Li-ion battery cell has a small thickness and a compact structure, and is laminated closely and easy for preparation and industrial automatic production. The Li battery prepared by the method has a uniform structure, a low internal resistance, a high uniformity, a good unity, and a high safety.

Method of producing a gel polymer Li-ion battery

The present invention relates to a gel polymer Li-ion battery electrode slice and a method for preparing the same. The electrode slice comprises a two-layer composite structure of electrode active material/gel electrolyte or a three-layer composite structure of electrode active material/gel electrolyte/electrode active material. The method includes preparation and filtration of gel polymer Li-ion battery electrode slurry and gel polymer electrolyte slurry and a multi-layer one-step coating process, and includes the following steps: a) grinding an electrode active material, and adding an adhesive, a surfactant, a dispersant thereto to obtain a raw slurry of the electrode active material; b) filtering the raw slurry of the electrode active material to obtain a uniform, fine precoating slurry; c) dispersing a monomer, a curing agent of the gel electrolyte and a polymer Li battery electrolyte into a solvent, and filtering the resultant dispersion to obtain a precoating gel electrolyte slurry; and d) coating directly the precoating slurries obtained in steps b) and c) on a composite film of current collector and polyester by a multi-layer one-step coating process to obtain a battery electrode slice of a two-layer composite structure of electrode active material/gel electrolyte or of a three-layer composite structure of electrode active material/gel electrolyte/electrode active material.

Gel polymer Li-ion battery electrode slice and preparing method thereof

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Dalian, China

Qiangli Gao