Facile Synthesis of Molybdenum Disulfide/Carbon Nanocomposites in Polyacrylic Acid Hydrogel as Anode for Lithium‐Ion Batteries

Abstract

Molybdenum disulfide (MoS2)/carbon nanocomposites are grown in a polyacrylic acid (PAA) hydrogel system via a facile hydrothermal process and carbonization of PAA by heat treatment under an argon atmosphere. The content of the MoS2 electrode material can be controlled effectively by adjusting the immersing time of the MoS2 precursor with PAA hydrogel. The MoS2/carbon nanocomposites containing MoS2 nanosheets are uniformly embedded in a 3D interconnected network carbon matrix. The unique network structure as a nano/microreactor to produce MoS2 nanosheets contributes to suppressing the aggregation of MoS2 nanosheets and improving the conductivity of nanocomposites. The MoS2/carbon nanocomposites demonstrate a good cycling stability and superior rate performance.

Hierarchical Hollow‐Nanocube Ni−Co Skeleton@MoO3/MoS2 Hybrids for Improved‐Performance Lithium‐Ion Batteries

“…Additionally,t he discharge platformso ft he NCM-NC and M-NF electrodes shift to lower voltages at high current density,w hich implies that more electrons are congested on the surfaceo ft he electrode (FigureS6b,c in the Supporting Information). [36] The specific capacity of the hollow NiÀ Co skeletons essentially remained stable during the first 200 cycles. Figure 6c displays the cycling performance of NCM-NC,M -NF,a nd NiÀCo skeleton electrodes at ac urrent density of 0.2 Ag À1 over the voltage range of 0.01-3.0 V. The M-NF electrode exhibits as lowly increasing trend during the first 155 cycles because the M-NF electrode is gradually activated.A fter 150 cycles, the M-NF electrode displays ad ramatically decreasing trend due to the gradual accumulationo fv olumee xpansion as ar esult of structural collapse( Figure S7 ai nt he Supporting Information).…”

“…[25] By comparison with the preparation detailso fN i ÀCo PBAs in previous reports ( Table S1 in the Supporting Information), and in combination with experimental verification ( Figure S1 a-c in the Supporting Information), we concluded that the as-prepared NiÀCo PBAs with much smallerp articles izes might be assignedt ot he differencei n the concentrationo ft he solutions and masses of the reagents. [36] Owing to the nanoscale Kirkendall effect, [37] the NiÀCo PBAs changed to larger sizes and hollow structuresa fter selfassembly. [36] Owing to the nanoscale Kirkendall effect, [37] the NiÀCo PBAs changed to larger sizes and hollow structuresa fter selfassembly.…”

“…The CV curveso fN CM-NC electrodes were measured at 0.2 mV s À1 between0 .01 and 3.0 V. As shown in Figure 5a 9)]. (11)] and decomposition of the SEI film, [36] and the last peak located at about 2.33 Vi sl inked with the intercalation and deintercalation of Li 2 Sa nd S[ Eq. In the first charging process, the crucial anodic peak of 1.3-1.8 Vb elongs to the transformation of Mo to MoS 2 [Eq.…”

“…[25,34,35] In addition, the formation mechanism of NiÀCo PBAs (Ni 3 (2)- (5). [36] Owing to the nanoscale Kirkendall effect, [37] the NiÀCo PBAs changed to larger sizes and hollow structuresa fter selfassembly.…”

“…[13,36] The value of b was defined by the slope of plots of log (i)v ersus log (v). [13,36] The value of b was defined by the slope of plots of log (i)v ersus log (v).…”