3D phosphorus-carbon electrode with aligned nanochannels promise high-areal-capacity and cyclability in lithium-ion battery

By Yan, Yuhua; Xu, Hongyi; Peng, Chengxin; Zhang, Pengcheng; Yang, Junhe; Zheng, Shiyou
Published in Applied Surface Science 2019

Abstract

Despite of poor electrical conductivity and large volume expansion, low mass loading of phosphorus-based electrode severely decrease overall gravimetric/volumetric energy density, impeding its practical application in lithium ion batteries (LIBs). Herein, we construct a high-areal-capacity P@rGO-ACW electrode by warping phosphorus with rGO and confining in 3D microchanneled carbon matrix (P@rGO-ACW). The conductive 3D carbon scaffold (ACW) derived from natural wood acts as integrated porous current collector to accelerate the electrons/ions transport, while the vertical-alignment microchannels confine phosphorus and accommodate its volume expansion. The unique feature of phosphorus?carbon electrode with 3D aligned nanochannels allows for a considerable improvement in high-areal-capacity and cyclability even in case of high mass loading. As expected, the P@rGO-ACW electrode can deliver a superior lithium storage capacity of 12.5 Ah cm?2 at a current of 0.5 mA cm?2 and a stable cycling performance of 9.5 Ah cm?2 at 1.0 mA cm?2 with a phosphorus mass loading of 16.6 mg cm?2. Our approach provides a versatile methodology to explore high mass-loading electrode towards developing high energy LIBs.

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