We report a novel succinonitrile (SN)-based electrolyte SN–DLi–FEC (SN–LiTFSI–LiODFB–FEC), which shows excellent compatibility with the Li-metal anode.

A novel progressive concentration gradient cathode material, LiNi0.7Co0.13Mn0.17O2, with superior capacity and cycling stability is reported for the first time.

Owing to the thinness and large lateral size, 2D Si materials exhibit very promising prospects as the high-performance anodes of lithium-ion batteries (LIBs). However, the facile synthesis of ultrathin 2D Si nanosheets (Si-NSs) and their efficient application still remain a great challenge. Herein, the fabrication of ultrathin Si-NSs with the average thickness of <2 nm is demonstrated using a unique etching-reduction protocol. After hybridizing with graphene, the as-prepared Si-NSs@rGO material delivers ultrahigh rate capability (2395.8 mAh g −1 at 0.05 A g −1 and 1727.3 mAh g −1 at 10 A g −1 ), long cycling lifespan (1000 cycles at 2 A g −1 with a capacity decay rate of 0.05% per cycle) and high average Coulombic efficiency (99.85% during 1000 cycles). The superior performance is attributed to the ultrathinness of Si-NSs that greatly improves the diffusivity and reversibility of Li + ions. This work provides a strategy for fabricating a high-rate-capability anode material to meet the growing demand for high power density LIBs.

No abstract

No abstract

No abstract

No abstract

Mitigating the mechanical degradation and enhancing the ionic/electronic conductivity are critical but challengeable issues toward improving electrochemical performance of conversion‐type anodes in rechargeable batteries. Herein, these challenges are addressed by constructing interconnected 3D hierarchically porous structure synergistic with Nb single atom modulation within a Co3O4 nanocage (3DH‐Co3O4@Nb). Such a hierarchical‐structure nanocage affords several fantastic merits such as rapid ion migration and enough inner space for alleviating volume variation induced by intragrain stress and optimized stability of the solid‐electrolyte interface. Particularly, experimental studies in combination with theoretical analysis verify that the introduction of Nb into the Co3O4 lattice not only improves the electron conductivity, but also accelerates the surface/near‐surface reactions defined as pesudocapacitance behavior. Dynamic behavior reveals that the ensemble design shows huge potential for fast and large lithium storage. These features endow 3DH‐Co3O4@Nb with remarkable battery performance, delivering ≈740 mA h g−1 after ultra‐long cycling of 1000 times under a high current density of 5 A g−1. Importantly, the assembled 3DH‐Co3O4@Nb//LiCoO2 pouch cell also presents a long‐lived cycle performance with only ≈0.059% capacity decay per cycle, inspiring the design of electrode materials from both the nanostructure and atomic level toward practical applications.