Facile fabrication and electrochemical properties of high-quality reduced graphene oxide/cobalt sulfide composite as anode material for lithium-ion batteries

Abstract

A simple and efficient ultrasound-assisted wet chemical-synthesized rGO/cobalt sulfide anode exhibits high lithium storage capacity and excellent rate capability.

Hollow nanospheres of mesoporous Co 9 S 8 as a high-capacity and long-life anode for advanced lithium ion batteries

“…After 100 cycles at 200 mA g À 1 , the reversible capacity of Co 9 S 8 -650 is $ 1122 mA h g À 1 (Figure S5), much better than the previous reports (Table S1) [7,[15][16][17][18][19][20][21][22][23][24][25][26][27][28]. For example, roselike Co 9 S 8 microparticles assembled by numerous nanosheets [17], only showed a discharge capacity of 123 mA h g À 1 after 30 cycles at 50 mA g À 1 .…”

“…Electrochemical measurements show their outstanding lithiumstorage performance, $1414 mA h g À 1 after 100 cycles at a current density of 100 mA g À 1 . This result is much higher than those in literature [15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Intriguingly, the cycling of these hollow nanospheres presents a typical capacity recovery, which was observed in many transitional metal oxides but less understood [11,14,29].…”

“…Cobalt sulfides as an anode have been receiving attention recently, due to their high electronic conductivity, good thermal stability and high theoretical capacity [7,[15][16][17][18][19][20][21][22][23][24][25][26][27][28]. For instance, rose-like Co 9 S 8 architectures composed of randomly dispersed nano-sheets [17], presented a reversible capacity of 123 mA h g À 1 after 30 cycles at 50 mA g À 1 .…”

Synthesis of nickel and cobalt sulfide nanoparticles using a low cost sonochemical method

“…The phase diagram of the Co-S system is complicated due to the coexistence of strongly reducible cobalt and oxidizable sulfur ion [34]. Cobalt sulfides are reported to have potential applications as catalysts [35, 36], capable of splitting water to produce hydrogen [37], magnetic materials [34, 38], counter electrodes for solar cells [39, 40, 41], anode materials for advanced lithium ion batteries [42, 43, 44] and high-performance supercapacitors [45, 46, 47, 48]. …”

“…More recently, Hoodles et al [35] prepared Co 9 S 8 by heating Co 3 O 4 in a stream of 9.8% H 2 S in H 2 . Milder routes for the synthesis of nanosized cobalt sulfides have been developed during the last decade, like decomposition of cobalt−thiourea complexes [33, 50], wet chemical methods [36, 41, 42], microwave assisted methods [32, 48], and in the first place the hydrothermal/solvothermal method [34, 39, 43, 46, 47, 49, 50, 51, 52]. It should be mentioned that You et al report significant advantages of CoS prepared by a microwave synthesis when compared to counterparts prepared by the solvothermal method [48].…”