One-Pot Synthesized Amorphous Cobalt Sulfide With Enhanced Electrochemical Performance as Anodes for Lithium-Ion Batteries

Abstract

In order to solve the poor cycle stability and the pulverization of cobalt sulfides electrodes, a series of amorphous and crystalline cobalt sulfides were prepared by one-pot solvothermal synthesis through controlling the reaction temperatures. Compared to the crystalline cobalt sulfide electrodes, the amorphous cobalt sulfide electrodes exhibited superior electrochemical performance. The high initial discharge and charge capacities of 2,132 mAh/g and 1,443 mAh/g at 200 mA/g were obtained. The reversible capacity was 1,245 mAh/g after 200 cycles, which is much higher than the theoretical capacity. The specific capability was 815 mAh/g at 800 mA/g and increased to 1,047 mAh/g when back to 100 mA/g, indicating the excellent rate capability. The outstanding electrochemical performance of the amorphous cobalt sulfide electrodes could result from the unique characteristics of more defects, isotropic nature, and the absence of grain boundaries for amorphous nanostructures, indicating the potential application of amorphous cobalt sulfide as anodes for lithium-ion batteries.

The Review of Hybridization of Transition Metal-Based Chalcogenides for Lithium-Ion Battery Anodes

“…A novel amorphous MoS 2 /MoO 3 anode exhibited high specific capacity and cycling stability [ 83 ]. Compared to the crystal CoS anode, amorphous CoS exhibited much higher specific capacity and rate capability [ 10 ]. The amorphous CoO buffer was introduced to accommodate the volume expansion of CoO nanosheets, by which the CoO nanosheets/CoO film exhibited better electrochemical performance than CoO nanosheets [ 12 ].…”

“…As a representative of the conversion reaction, transition metal chalcogenides, as one of the most promising alternatives to carbon-based anodes, have been extensively explored, exhibiting high specific capacity and outstanding rate performance [ 10 , 11 , 12 ]. For practical application, the drawbacks of volume expansion and low conductivity for these anode materials during the cycling process should be further resolved.…”

Nanocarbon in Sodium‐ion Batteries – A Review. Part 1: Zero‐dimensional Carbon Dots

“…ious applications such as supercapacitors, batteries and catalysis [107,110]. However, they have limited use due to its large volume expansion, poor cycling stability and sluggish electrode kinetics.…”

Designing CoS2-Mo2C and CoS2-W2C hybrids for high-performance supercapacitors and hydrogen evolution reactions

“…Cobalt sulfides, encompassing various chemical stoichiometric ratios (e.g., Co x S y , CoS, CoS 2 , Co 3 S 4 , Co 9 S 8 , and Co 4 S 3 ), and their heterojunctions have been extensively explored in electrochemical applications. 27,28 The intrinsic drawbacks of traditional cobalt sulfide materials, including intrinsically low conductivity, tendency for agglomeration, and suboptimal speed performance and cycling stability, are primarily attributed to the hindered ion and electron diffusion/transportation kinetics. These challenges can be tackled using various strategies.…”