Conjugated microporous polymer derived N, O and S co-doped sheet-like carbon materials as anode materials for high-performance lithium-ion batteries

Abstract

Rational design and preparation of nitrogen (N), oxygen (O), and sulfur (S) co-doped materials with distinguished electrochemical performance in lithium-ion batteries are highly sensible. In this study, layered structure carbon material (PTPAO@600) with co-doped N, O and S elements is prepared by carbonizing conjugated microporous polymers (CMPs) as a precursor. When PTPAO@600 electrode material employed as anode of LIBs, and evaluated its properties in electrochemical aspects. After cycling for 800 times under 0.1 A g−1, PTPAO@600 electrode has shown powerful reversible specific capacity of 1142.5 mAh g−1, and excellent rate capability of 275 mAh g−1 at 2.0 A g−1 large current density. Long-cycle performance for 1000 charge/discharge cycles shows that the capacity is retained at 490.9 mAh g−1 under 1.0 A g−1, revealing its high stability. Such high lithium storage performance is mainly attributed to rich heteroatom co-doping, larger specific surface area and high Li+ diffusion coefficient. The superior electrochemical performance makes the PTPAO@600 a anode material with potential in secondary batteries.