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

Porous carbon-wrapped mesoporous Co9S8 fibers as stable anode for Li-Ion Batteries

“…The strong intense peak can be associated with reduction of Co9S8 to metallic Co. [34] In addition, there is a weak peak centered at 0.7 V, which is assigned to the formation of solid electrolyte interphase (SEI) and the decomposition of the electrolyte. [35] In the first anodic scan, the strong peak at 2.04 V is likely ascribed to the sulfuration of metallic Co. [36] Such peak almost exists in the subsequent scans although slightly shifted to higher potential range, manifesting the good reversibility of the electrodes. Figure 5b shows the typical voltage profiles of the Co 9 S 8 @C composites at a current density of 0.1 C (1 C = 539 mA g -1 ) with a cut-off voltage rang of 0.01-3.0 V versus Li + /Li.…”

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].…”

Fabrication of NiFe2O4/C hollow spheres constructed by mesoporous nanospheres for high-performance lithium-ion batteries

“…Lithium ion batteries (LIBs), one of the most promising energy storage systems, have been attracted much attention because of their environmental benignity, high energy density, high power density and long cycle life [1,2]. Recently, various transition metal oxides such as Co 3 O 4 [2][3][4][5], Fe 2 O 3 [6][7][8][9][10], Fe 3 O 4 [11], SnO 2 [12][13][14][15], CoMn 2 O 4 [16], NiCo 2 O 4 [17][18][19], MnFe 2 O 4 [20,21], NiFe 2 O 4 [22][23][24][25] and etc.…”