Energy Storage Quiz 3

LIB Safety, Capacitors, Supercapacitors, Fuel Cells

Thermal runaway failure

External heat source that can cause electrolyte to melt the system

What can cause an internal short?

Dendritic Li metal can go through the separator, causing separator failure

Most common failure runaway

Electrolyte can break down in cell, and gas can escape and combust, causing partial decomposition of cathode and burning graphite

What temperature does a separator typically melt at?

130C

Shutdown separator

At a certain temperature, all pores collapse in the separator

How does a shutdown separator work?

Since it’s a non-porous substance, no ion conductivity occurs, stopping energy release if there is a short

Ceramic coated separator, how does it differ from a shutdown separator?

Have temperature buffer to fight shorting, without shutting down the system

What is the underlying issue of why separators fail at high temperatures?

Pores collapsing - is an issue