Synthesis of three dimensional extended conjugated polyimide and application as sodium-ion battery anode

• Three dimensional extended conjugated polyimides have been facilely prepared.
• The capacitance of obtained polymer is 88.8 mAh g−1 after 1000 cycles at 5.0 A g−1.
• Synergistic effect exists in electron withdrawing amide groups and triazine rings.
• As-made polyimide is a promising candidate for Na-ion battery anode.

Two covalent polyimides with different conjugated subunits have been synthesized as sodium-ion batteries anode. The melamine and two commercially available dianhydrides have been adopted as building blocks to fabricate 3D extended covalent frameworks, which are consisted of electron withdrawing amide groups and triazine rings to coordination with Na ions. The results revealed that cross-linked polymer exhibits excellent durability and rate capacity (88.8 mAh g−1 at a current density of 5.0 A g−1 after 1000 cycles), which provides a promising candidate for high performance Na-ion battery anode.

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