COSOLVENT ELECTROLYTES FOR ELECTROCHEMICAL DEVICES

摘要

A system and method for stabilizing electrodes against dissolution and/or hydrolysis including use of cosolvents in liquid electrolyte batteries for three purposes: the extension of the calendar and cycle life time of electrodes that are partially soluble in liquid electrolytes, the purpose of limiting the rate of electrolysis of water into hydrogen and oxygen as a side reaction during battery operation, and for the purpose of cost reduction.

主权项

1. A rechargeable electrochemical cell, comprising:
a positive electrode; a negative electrode; and an electrolyte having a total electrolyte volume V including a first quantity of water comprising a first fraction V1 of said total electrolyte volume V and including a second quantity of one or more organic cosolvents together comprising a second fraction V2 of said total electrolyte volume V; wherein V1/V>0.02; wherein V2>V1; wherein a particular one electrode of said electrodes includes a transition metal cyanide coordination compound (TMCCC) material; and wherein said electrolyte is a single phase.