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

摘要

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.