The commercialization of lithium‐sulfur (Li‐S) batteries is greatly hindered due to serious capacity fading caused by the polysulfide shuttling effect. Optimizing the structural configuration, enhancing reaction kinetics of the sulfur cathode, and increasing areal sulfur loading are of great significance for promoting the commercial applications of Li‐S batteries. Herein, the multifunctional polysulfide scavengers based on nitrogen, sulfur co‐doped carbon cloth (DCC), which is supported by flower‐like MoS2 (1T‐2H) decorated with BaMn0.9Mg0.1O3 perovskite particle (PrNP) and carbon nanotubes (CNTs), namely, DCC@MoS2/PrNP/CNTs, are delicately designed and synthesized. The physical confinement, chemical coupling, and catalysis conversion for active sulfur are achieved simultaneously in this polysulfide motif. Due to these merits, the as‐fabricated self‐supported DCC@MoS2/PrNP/CNTs/S manifests an excellent reversible areal capacity of 4.75 mAh cm−2 with an ultrahigh sulfur loading of 5.2 mg cm−2 at the 50th cycle. The outstanding cycling stability is obtained upon 800 cycles with a large reversible capacity of 871 mAh g−1 and a negligible fading rate of 0.02% per cycle at a rate of 1.0 C, suggesting its promising prospects for the commercial success of high‐performance Li‐S batteries toward flexible electronic devices and energy storage equipment.
A crucial
challenge for the commercialization of Ni-rich layered
cathodes (LiNi0.88Co0.09Al0.03O2) is capacity decay during the cycling process, which originates
from their interfacial instability and structural degradation. Herein,
a one-step, dual-modified strategy is put forward to in situ synthesize
the yttrium (Y)-doped and yttrium orthophosphate (YPO4)-modified
LiNi0.88Co0.09Al0.03O2 cathode material. It is confirmed that the YPO4 coating
layer as a good ion conductor can stabilize the solid–electrolyte
interface, while the formative strong Y–O bond can bridle TM–O
slabs to intensify the lattice structure in the state of deep delithium
(>4.3 V). In particular, both the combined advantages effectively
withstand the anisotropic strain generated upon the H2–H3 phase
transition and further alleviate the crack generation in unit-cell
dimensions, assuring a high-capacity delivery and fast Li+ diffusion kinetics. This dual-modified cathode shows advanced cycling
stability (94.1% at 1C after 100 cycles in 2.7–4.3 V), even
at a high cutoff voltage and high rate, and advanced rate capability
(159.7 mAh g–1 at 10C). Therefore, it provides a
novel solution to achieve both high capacity and highly stable cyclability
in Ni-rich cathode materials.
High Ni-low Co layered oxides are considered as the most promising next generation cathode material for high energy density lithium ion battery in order to fulfil the demand of 300...
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