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Block Copolymer Cathode Binder to Simultaneously Transport Electronic Charge and Ions
IB-3025

APPLICATIONS OF TECHNOLOGY:

ADVANTAGES:

ABSTRACT:

A Berkeley Lab team led by Nitash Balsara has developed a highly efficient lithium ion battery in which a single inactive material—a polymeric binding agent—serves as a binder that holds active cathode materials together and as a two-lane conductor that simultaneously carries lithium ions and electronic charge.

Using click chemistry, a modular organic synthesis method, Balsara and his team synthesized a binding agent called poly(3-hexyl thiophene)-b-poly(ethylene oxide), or P3HT-PEO. As a binder, P3HT-PEO acts like a glue that holds the active particles of the cathode (e.g., LiFePO4) in place. It also performs as a highway for electronic charge and lithium ions. Chemically, P3HT-PEO is described as a block copolymer that has a sandwich-like structure with alternating P3HT and PEO domains that conduct electronic charge and ions, respectively. Thus, a single material performs all the supporting functions required in a battery electrode.

P3HT is a semiconductor that can only transport electronic charge under specific conditions (applied potentials) offering batteries a novel mechanism for shutdown by blocking the electronic charge. This is an important additional feature that, in principle, can be used to engineer an “intelligent” lithium battery designed to charge rapidly with a built-in mechanism; to protect against overcharging; or turn itself off to prevent catastrophic discharge.

DEVELOPMENT STAGE:  Bench-scale prototype. 

STATUS:  Patent pending.  Available for licensing or collaborative research.

FOR MORE INFORMATION:
Javier, A.E., Patel, S.N., Hallinan Jr., D.T., Srinivasan, V., Balsara, N.P. “Simultaneous Electronic and Ionic Conduction in a Block Copolymer: Application in Lithium Battery Electrodes,” Angewandte Chemie International Edition 2011, Volume 50, pp. 9848-9851.

SEE THESE OTHER BERKELEY LAB TECHNOLOGIES IN THIS FIELD:

Lower Cost, Nanoporous Block Copolymer Battery Separator, IB-3024

Non-Cross-Linked Gel Polymer Electrolytes for Lithium Ion Batteries, JIB-2731

Precise Control of Nanoparticle Self-Assembly over Multiple Length Scales, JIB-2662

REFERENCE NUMBER: IB-3025

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