A One-Dimensional π-d Conjugated Coordination Polymer for Sodium Storage with Catalytic Activity in Negishi Coupling.

π-d Conjugated coordination polymers (CCPs) have attracted much attention for various applications, although the chemical states and structures of many CCPs are still blurry. Now, a one-dimensional (1D) π-d conjugated coordination polymer for high performance sodium-ion batteries is presented. The chemical states of the obtained coordination polymer are clearly revealed. The electrochemical process undergoes a three-electron reaction and the structure transforms from C=N double bonds and NiII to C-N single bonds and NiI , respectively. Our unintentional experiments provided visual confirmation of NiI . The existence of NiI was further corroborated by its X-ray absorption near-edge structure (XANES) and its catalytic activity in Negishi cross-coupling.

A highly conductive conjugated coordination polymer for fast-charge sodium-ion batteries: reconsidering its structures.

Conjugated coordination polymers (CCPs), showing high conductivity, can be expected to be possibly applied in batteries, which, however, have not been well studied. Furthermore, CCPs are so unique that most of their chemical structures have not been well determined. Herein, a highly conductive CCP is reported for sodium-ion batteries, which shows high rate performance and high capacity retention of 84% even at 30C. What's more, the chemical structure is successfully revealed based on the structure variation during the electrochemical redox process.