Building High Rate Capability and Ultrastable Dendrite-Free Organic Anode for Rechargeable Aqueous Zinc Batteries.

Aqueous zinc-ion batteries (ZIBs) are an alternative energy storage system for large-scale grid applications compared with lithium-ion batteries, when the low cost, safety, and durability are taken into consideration. However, the reliability of the battery systems always suffers from the serious challenge of the large Zn dendrite formation and "dead Zn," thus bringing out the inferior cycling stability, and even cell shorting. Herein, a dendrite-free organic anode, perylene-3,4,9,10-tetracarboxylic diimide (PTCDI) polymerized on the surface of reduced graphene oxide (PTCDI/rGO) utilized in ZIBs is reported.

Biomass-Derived P/N-Co-Doped Carbon Nanosheets Encapsulate CuP Nanoparticles as High-Performance Anode Materials for Sodium-Ion Batteries.

Biomass-derived approaches have been accepted as a practical way for the design of transitional metal phosphides confined by carbon matrix (TMPs@C) as energy storage materials. Herein, we successfully synthesize P/N-co-doped carbon nanosheets encapsulating CuP nanoparticles (CuP@P/N-C) by a feasible aqueous reaction followed by a phosphorization procedure using sodium alginate as the biomass carbon source. Cu-alginate hydrogel balls can be squeezed into two-dimensional (2D) nanosheets through a freeze-drying process.

Constructing the Efficient Ion Diffusion Pathway by Introducing Oxygen Defects in MnO for High-Performance Aqueous Zinc-Ion Batteries.

Mn-based cathodes are admittedly the most promising candidate to achieve the practical applications of aqueous zinc-ion batteries because of the high operating voltage and economic benefit. However, the design of Mn-based cathodes still remains challenging because of the vulnerable chemical architecture and strong electrostatic interaction that lead to the inferior reaction kinetics and rapid capacity decay. These intrinsic drawbacks need to be fundamentally addressed by rationally decorating the crystal structure.

MoP hollow nanospheres encapsulated in 3D reduced graphene oxide networks as high rate and ultralong cycle performance anodes for sodium-ion batteries.

Molybdenum phosphide (MoP), regarded as a promising anode material for sodium-ion batteries due to its superior conductivity and high theoretical specific capacity, still suffers from rapid capacity decay because of a large volume change and weak diffusion kinetics. Hollow nano-structures will be an effective solution to alleviate structural strain and improve cycling stability. Yet the preparation of MoP needs a high temperature phosphorization procedure which would cause agglomeration and structure collapse, making it difficult to achieve hollow nano-structures.

In Situ Synthesis of CuCoS@N/S-Doped Graphene Composites with Pseudocapacitive Properties for High-Performance Lithium-Ion Batteries.

To satisfy the demand of high power application, lithium-ion batteries (LIBs) with high power density have gained extensive research effort. The pseudocapacitive storage of LIBs is considered to offer high power density through fast faradic surface redox reactions rather than the slow diffusion-controlled intercalation process. In this work, CuCoS anchored on N/S-doped graphene is in situ synthesized and a typical pseudocapacitive storage behavior is demonstrated when applied in the LIB anode.

Coupled flower-like BiS and graphene aerogels for superior sodium storage performance.

A hierarchically structured BiS/graphene aerogel composite is constructed that shows excellent sodium storage properties. Specifically, the composite delivers a stable reversible capacity of 397 mA h g at 100 mA g after 50 cycles and 348 mA h g at 1 A g after 120 cycles. Furthermore, even at a high current density of 2 A g, a reversible capacity of 336 mA h g is achieved.