9. Solid Polymer Electrolytes from Hydro-Québec

Crosslinked solid polymer electrolytes (SPE)

Patent

Epoxy (oxiranes) crosslinking with amines

Jeffamines (polyetheramines linked to amines – low temp crosslinking agents)

HydroQuebec

Karim Zaghib – director of the institute

Glycidyl methacrylate/poly(ethylene glycol) methyl methacrylate random copolymer before crosslinking with ethylenediamine.

Hydro-Québec has been a leading solid polymer electrolyte (SPE) innovation engine for more than 20 years. It has already licensed legitimate solid battery technologies to electric car manufacturers such as Bluecar and Dongshi Kingpower. While initially limited to LFP cathodes and 80C operating temperature, current SPE technology extends to high voltage NCM, NCA or LCO cathodes and can operate at a lower temperature of 40C. SPE electrolytes are also stable with lithium metal electrodes guaranteeing higher energy densities than lithium ion cells with conventional liquid electrolytes.

Cycle life of solid state batteries with SPE is governed by the electrochemical stability of the polymer during cycling. Since most such polymers are crosslinked in order to improve their mechanical and electrochemical properties, residual crosslinking agent may often remain in the SPE during battery operation. This may cause undesired side reactions and accelerate deterioration of SPE. In this patent, Hydro-Québec discloses a crosslinking strategy which improves electrochemical stability.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s