Bellcore method

To date, several polymer hosts have been used in GPEs that include PEG, PPO, PAN, PMMA, poly(vinyl chloride) (PVC), PVdF, poly(vinylidene fluoride-hexafluoro propylene) (PVdF-HFP), etc. Furthermore, the Bellcore method and phase inversion method have been developed for the preparation of GPEs. The Bellcore process is critical and developed from the fabrication of PVdF-HFP copolymers. It involves the plasticization of PVdF-HFP copolymers, subsequent plasticizer removal, and the final reswelling in an electrolyte solution. Low-boiling solvents, such as diethyl ether or methanol, are successfully employed to remove dibutyl phthalate (DBF) from the polymer matrix, leaving a pore structure in the polymer layers which is then refilled with the liquid electrolyte during the cell activation process (Song et af, 1999). 

The test methods used to evaluate the corrosion of materials and plant components are described in Bellcore Technical Advisories (TAs), Technical References (TRs), and Generic Requirements (GRs). Many of the tests in these documents include and reference ASTM, UL, ANSI/NEMA, and MIL standards. Some of the test methods are specific to the telecommunication industry and can be found only in TAs, TRs, and GR s. Manufacturing and purchase of telecommunication plant components are based on these documents, thus, available to the manufacturers and to companies that sell them. The methods used for in-plant testing are described in Bell System Practices (BSPs) and licensed Bellcore documents. ... 

Repeater Housings for Tl, TIC, TID and TIG Carrier Systems, Bellcore TR-TSY-006, Bellcore, Livingston, NJ, 1984. [70] Military Standard MIL 883C, Test Method 1.4, Moisture Resistance, 1981. 

Originally, the Bellcore Company adopted a tedious method to prepare polymer electrolyte membranes. The main disadvantage of the method is that the plasticizer added as porogenic agent is very difficult to remove, producing serious adverse effects on the quality of the SEI film and electrochemical performance of the prepared lithium-ion batteries. Its industrial application was never realized in production. 

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