N-Doped Carbon–WS₂ Nanosheet Composites for Lithium-Ion Storage

Abstract

Constructing a hierarchical nanostructure has been regarded as one of the most useful strategies to improve the cycling stability and rate performance of anode. Herein, hierarchical N-doped carbon combined with ultrathin WS2 nanosheets (N-C/WS2) was fabricated through a simple chelation coordination method and sulfuration treatment. Ultrathin WS2 nanosheets with few layers were embedded in the porous conductive carbon nanosheet structure, which not only restricted the aggregation of WS2 nanosheets but also enhanced the ion/electron transfer kinetics during the charge–discharge procedure. Owing to the robust interaction between WS2 nanosheets and N-doped carbon, the as-prepared N-C/WS2 exhibited excellent cycling stability and rate performance in lithium-ion storage. Specifically, N-C/WS2 anodes delivered an excellent retention capacity of 600 mAh g–1 after 500 cycles at 1.0 A g–1. This work provides a facile strategy to fabricate a three-dimensional hierarchical carbon hybrid composed of metal sulfides for energy storage and conversion fields.

Interpenetrated N-rich MOF derived vesicular N-doped carbon for high performance lithium ion battery

“…To seek competitive electrode materials, juggling high capacity, high rate and long life is urgently needed. Various metal-organic frameworks (MOFs) [1][2][3][4] and MOF-derived materials, such as metal oxides, [5][6][7][8][9][10][11][12][13][14][15] metal sulfides, 16,17 metal phosphides, [18][19][20] and various carbon composites, [5][6][7][8][9][10][11][12][13][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] provide sensational appealing for high performance LIBs. Among them, nitrogen-doped carbon (N/C) materials are the most attractive due to their excellent electrical conductivity, tunable chemical and electronic structures, and significantly enhanced stability, modified by N-doping.…”

“…Among them, nitrogen-doped carbon (N/C) materials are the most attractive due to their excellent electrical conductivity, tunable chemical and electronic structures, and significantly enhanced stability, modified by N-doping. [5][6][7][8][9][10][11][12][13][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] These merits have been epitomized in recent excellent work. [5][6][7][8][9][10][11][12][13][21][22][23][24][25][26][27][28][29][30][31][32][33][34]…”

“…[5][6][7][8][9][10][11][12][13][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] These merits have been epitomized in recent excellent work. [5][6][7][8][9][10][11][12][13][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]…”

“…Among them, nitrogen-doped carbon (N/C) materials are the most attractive due to their excellent electrical conductivity, tunable chemical and electronic structures, and significantly enhanced stability, modified by N-doping. 5–13,21–38 These merits have been epitomized in recent excellent work. 5–13,21–38 For example, Huang et al reported N-doped carbon nanofiber webs which can deliver a high reversible capacity of ca.…”

“…5–13,21–38 These merits have been epitomized in recent excellent work. 5–13,21–38 For example, Huang et al reported N-doped carbon nanofiber webs which can deliver a high reversible capacity of ca. 943 mA h g −1 at a current density of 2 A g −1 and moderate stability to the 600th cycle.…”