Abstract
New types of energy storage are needed in conjunction with the deployment of solar, wind and other volatile renewable energy sources and their integration with the electric grid. No existing energy storage technology can economically provide the power, cycle life and energy efficiency needed to respond to the costly short-term transients that arise from renewables and other aspects of grid operation. Here we demonstrate a new type of safe, fast, inexpensive, long-life aqueous electrolyte battery, which relies on the insertion of potassium ions into a copper hexacyanoferrate cathode and a novel activated carbon/polypyrrole hybrid anode. The cathode reacts rapidly with very little hysteresis. The hybrid anode uses an electrochemically active additive to tune its potential. This high-rate, high-efficiency cell has a 95% round-trip energy efficiency when cycled at a 5C rate, and a 79% energy efficiency at 50C. It also has zero-capacity loss after 1,000 deep-discharge cycles. © 2012 Macmillan Publishers Limited. All rights reserved.
| Original language | English (US) |
|---|---|
| Journal | Nature Communications |
| Volume | 3 |
| Issue number | 1 |
| DOIs | |
| State | Published - Oct 23 2012 |
| Externally published | Yes |
Bibliographical note
KAUST Repository Item: Exported on 2020-10-01Acknowledged KAUST grant number(s): KUS-l1-001-12
Acknowledgements: We thank Matt T. McDowell for transmission electron microscope characterization and Nian Liu for his help in drawing the full cell schematic. We also acknowledge support from the King Abdullah University of Science and Technology (KAUST) Investigator Award (no. KUS-l1-001-12).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
