NiCo‐Layered Double Hydroxide to Composite with Sulfur as Cathodes for High‐Performance Lithium‐Sulfur Batteries

Abstract

Lithium‐sulfur (Li−S) batteries have become a research focus for high‐energy‐density rechargeable batteries owing to the considerable theoretical energy density. However, the polysulfide shuttle and sluggish kinetics in lithium‐sulfur (Li−S) chemistry lead to low sulfur utilization, large polarization and rapid capacity decay, posing a fatal threat to the commercialization of Li−S batteries. Herein, we etched zeolitic imidazolate framework‐67 (ZIF‐67) with Ni2+ to manufacture NiCo‐LDH, which is used as a sulfur host material for lithium‐sulfur (Li−S) batteries. Benefited from the closely packed nano‐clusters and the hollow structure, the NiCo‐LDH could not only inhibit the lithium polysulfides (LiPSs) diffusion but also accelerate the redox reactions. Owing to these properties, the corresponding Li−S batteries exhibit a superior capacity (1540 mAh g−1 at 0.1 C) and high rate performance (485 mAh g−1 at 5.0 C). This work shows a promising way for layered double hydroxide as cathodes for Li−S batteries.

N‐doped Nanocarbon Inserted NiCo‐LDH Nanoplates on NF with High OER/ORR Performances for Zinc‐Air Battery

“…However, the oxygen elements are lessened. This is probably because with the size decrease of NiCo‐LDH flakes grown on the surface of NCM, its surficial activity of NiCo‐LDH is largely promoted, leading to lots of oxygen vacancies during the hydrothermal reaction [39] . In addition, due to the densely coverage of NiCo‐LDH/NCM on NF, the Ni content is slightly decreased in NiCo‐LDH/NCM@NF relative to NiCo‐LDH/NCM.…”

“…This is probably because with the size decrease of NiCo-LDH flakes grown on the surface of NCM, its surficial activity of NiCo-LDH is largely promoted, leading to lots of oxygen vacancies during the hydrothermal reaction. [39] In addition, due to the densely coverage of NiCo-LDH/NCM on NF, the Ni content is slightly decreased in NiCo-LDH/NCM@NF relative to NiCo-LDH/ NCM. On the other side, the formation of oxygen vacancies results in the significant binding energy (BE) variation of Ni and Co since the formation of the large number of dangling bonds.…”

The Critical Role of Fillers in Composite Polymer Electrolytes for Lithium Battery

“…Moreover, solid-state electrolytes exhibit excellent mechanical strength and chemical neutrality, which can reduce the side reactions with lithium metal and inhibit the growth of lithium dendrites [ 3 , 4 ]. Therefore, solid-state electrolytes are considered as a promising route for the preparation of lithium batteries with high safety performance, high stability and high energy density [ 5 , 6 ].…”

Synthesis of the Ni2P–Co Mott–Schottky Junction as an Electrocatalyst to Boost Sulfur Conversion Kinetics and Application in Separator Modification in Li-S Batteries

“…To address the above challenges, new nanostructured carbon materials have been widely used as separator modifiers and this has led to the improved rate and cycle performance of batteries. , However, the cycle performance is still unsatisfactory due to the insufficient amount of polar sites needed for polysulfide adsorption . Recently, a large amount of efforts have been made to synthesize new separator modifying materials, such as heteroatom-doped carbon materials, , metal carbides, metal oxides, spinels, and perovskites, which can interact strongly with polysulfides.…”