Highly Conductive Two-Dimensional Metal-Organic Frameworks for Resilient Lithium Storage with Superb Rate Capability.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 32833424.
- Also identified by DOI 10.1021/acsnano.0c05200.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Redox-active organic cathode materials have drawn growing attention because of the broad availability of raw materials, eco-friendliness, scalable production, and diverse structural flexibility. However, organic materials commonly suffer from fragile stability in organic solvents, poor electrochemical stability in charge/discharge processes, and insufficient electrical conductivity. To address these issues, using Cu(II) salt and benzenehexathiolate (BHT) as the precursors, we synthesized a robust and redox-active 2D metal-organic framework (MOF), [Cu<sub>3</sub>(C<sub>6</sub>S<sub>6</sub>)]<sub><i>n</i></sub>, namely, Cu-BHT. The Cu-BHT MOFs have a highly conjugated structure, affording a high electronic conductivity of 231 S cm<sup>-1</sup>, which could further be increased upon lithiation in lithium-ion battery (LIB) applications. A reversible four-electron reaction reveals the Li storage mechanism of the Cu-BHT for a theoretical capacity of 236 mAh g<sup>-1</sup>. The as-prepared Cu-BHT cathode delivers an excellent reversible capacity of 175 mAh g<sup>-1</sup> with ultralow capacity deterioration (0.048% per cycle) upon 500 cycles at a high current density of 300 mA g<sup>-1</sup>. Therefore, we believe this work would provide a practical strategy for the development of high-power energy storage materials.