3D red phosphorus/sheared CNT sponge for high performance lithium-ion battery anodes

By Yuan, Tao; Ruan, Jiafeng; Peng, Chengxin; Sun, Hao; Pang, Yuepeng; Yang, Junhe; Ma, Zi-Feng; Zheng, Shiyou
Published in Energy Storage Materials 2018

Abstract

Phosphorus (P) is considered one of the most attractive anodic materials for lithium-ion batteries (LIBs) owing to its high theoretical specific capacity (2596 mAh g?1). Nevertheless, it suffers from intrinsic poor conductivity (10?12 S m?1) and large volume expansion ( 440%) during the lithiation process, leading to low reaction dynamics and serious capacity decay upon cycling. In this work, red P confined in a three-dimensional (3D) sheared carbon nanotube (SCNT) conductive sponge is prepared, showing high capacity and long cyclability as anodes for LIBs. The resultant 3D P-SCNT composite delivers a stable capacity of 1600 mAh g?1 at a current density of 0.1 A g?1 and a reversible high-rate capacity as high as 782 mAh g?1 at 2 A g?1 even after 3000 cycles, owing to the robust support of the SCNT framework and stable chemical bonds between the evenly distributed red P and SCNT.

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