Abstract
If an electrochemical energy storage device, which contains tetracyanoborate anions in the electrolyte, is accidentally charged with much higher voltage, it won't explode, because of a self-blocking mechanism. Firstly, voltage (E) more positive than 2.2V (vs. Ag|AgCl reference electrode) kills the conductivity of single layer graphene and electrochemical reactions stop. Secondly, at E>2.2V tetracyanoborate anion polymerizes to a dielectric polymer polycyanoborani, which electrically isolates graphite or porous carbon grains from current collectors.
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