Lithium ion polymer electrolyte film and manufacturing method of lithium ion cell comprising the film

Abstract

The invention relates to a lithium ion polymer electrolyte membrane and a preparation method of a lithium ion battery containing the electrolyte membrane. In the present invention, a polymer matrix with high amorphous phase is prepared by free radical copolymerization with PEO macromonomer, ethylenic small monomer, and azobisisobutyronitrile, and the matrix is ​​compounded with lithium salt and fast ion conductor nanopowder Finally, the lithium ion polymer electrolyte membrane is made by casting method, the electrolyte membrane has good mechanical properties, stable chemical properties, and high electrical conductivity; then lithium iron phosphate is used as the positive electrode material, and the electrolyte membrane is used as the separator to make the lithium ion polymer electrolyte membrane. Battery; the battery has good electrochemical performance, large capacity, long cycle life, safe and reliable charging and discharging process. The production process in the invention is simple, the yield is high, and the cost is low. The prepared positive and negative plates have uniform texture and uniform product performance, and are convenient to be combined into a battery pack to work.

Description

(1) Technical field [0001] The invention relates to the technical field of rechargeable lithium-ion batteries, in particular to a lithium-ion polymer electrolyte membrane and a preparation method thereof, and also to a manufacturing method of a lithium-ion battery containing the lithium-ion polymer electrolyte membrane. (2) Background technology [0002] Lithium-ion batteries refer to the general term for lithium-ion intercalation compounds as cathode materials. The charging and discharging process of lithium-ion batteries is the intercalation and deintercalation process of lithium ions. The research on lithium-ion batteries began in the 1980s. In 1990, Japan developed LiCoO with petroleum coke as the negative electrode. 2 Lithium-ion secondary battery as the positive electrode, and commercialized, its appearance can be regarded as a leap in the history of secondary batteries. Lithium-ion intercalation compounds, such as LiCoO, are commonly used as cathode materials for li...

AI Technical Summary

Problems solved by technology

Polyoxyethylene (PEO) has good mechanical properties and chemical stability, and is one of the polymer electrolyte systems that are expected to be commercialized. However, after the metal salt is dissolved in PEO, it is easy to form a crystalline complex, and its conductivity is low. Far from meeting the needs of the application

[0004] Cathode materials are also one of the key technologies for the development of high-performance lithium-ion battery materials, but LiCoO, which has been commercially applied 2 Scarce, expensive and toxic, LiNiO 2 Preparation is difficult, and there are safety issues, while LiMn 2 o 4 The cycle performance and high temperature performance are difficult to meet the requirements

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