Cyclen-linked benzoquinone based carbonyl network polymer for high-performance lithium organic battery

Carbonyl polymers for cathodes of lithium batteries have attracted wide attention owing to their diverse and finely tuned structures. However, the problem of poor cycling performance caused by the dissolution of the carbonyl polymer electrodes in the electrolyte hinders their further development. Here, we design and report a cyclen-linked benzoquinone based carbonyl network polymer (NP4), which when used as the cathode material in lithium organic batteries, exhibits a specific capacity of 260.7 mA h g−1 at a current density of 20 mA g−1. Compared to the previously reported carbonyl linear polymer NP2, the stable network chemical structure of NP4 allows excellent capacity retention (80 % after 4000 cycles at 500 mA g−1). These results demonstrate that polymer NP4 with a network chemical structure exhibits excellent battery performance as a lithium battery cathode. This work shows that NP4 is a good cathode material for lithium batteries and opens a wide range of prospects for energy storage in carbonyl network polymers.