Research Article Issue
Highly dispersed Co-Mo sulfide nanoparticles on reduced graphene oxide for lithium and sodium ion storage
Nano Research 2020, 13 (1): 188-195
Published: 02 January 2020

A novel hybrid, highly dispersed spinel Co-Mo sulfide nanoparticles on reduced graphene oxide (Co3S4/CoMo2S4@rGO), is reported as anode for lithium and sodium ion storage. The hybrid is synthesized by one-step hydrothermal method but exhibits excellent lithium and sodium storage performances. The as-synthesized Co3S4/CoMo2S4@rGO presents reversible capacity of 595.4 mA·h·g-1 and 408.8 mA·h·g-1 after 100 cycles at a current density of 0.2 A·g-1 for lithium and sodium ion storages, respectively. Such superior performances are attributed to the unique composition and structure of Co3S4/CoMo2S4@rGO. The rGO provides a good electronically conductive network and ensures the formation of spinel Co3S4/CoMo2S4 nanoparticles, the Co3S4/CoMo2S4 nanoparticles provide large reaction surface for lithium and sodium intercalation/deintercalation, and the spinel structure allows fast lithium and sodium ion diffusion in three dimensions.

Research Article Issue
Infiltrating lithium into carbon cloth decorated with zinc oxide arrays for dendrite-free lithium metal anode
Nano Research 2019, 12 (3): 525-529
Published: 23 November 2018

Lithium metal anode for batteries has attracted extensive attentions, but its application is restricted by the hazardous dendritic Li growth and dead Li formation. To address these issues, a novel Li anode is developed by infiltrating molten Li metal into conductive carbon cloth decorated with zinc oxide arrays. In carbonate-based electrolyte, the symmetric cell shows no short circuit over 1, 500 h at 1 mAdcm-2, and stable voltage profiles at 3 mAdcm-2 for ~ 300 h cycling. A low overpotential of ~ 243 mV over 350 cycles at a high current density of 10 mAdcm-2 is achieved, compared to the seriously fluctuated voltage and fast short circuit in the cell using bare Li metal. Meanwhile, the asymmetric cell withstands 1, 000 cycles at 10 C (1 C = 167 mAhdg-1) compared to the 210 cycles for the cell using bare Li anode. The excellent performance is attributed to the well-regulated Li plating/stripping driven from the formation of LiZn alloy on the wavy carbon fibers, resulting in the suppression of dendrite growth and pulverization of the Li electrode during cycling.

total 2