Rational Design of the Lotus‐Like N‐Co₂VO₄‐Co Heterostructures with Well‐Defined Interfaces in Suppressing the Shuttle Effect and Dendrite Growth in Lithium–Sulfur Batteries

Abstract

The shuttle effect caused by soluble lithium polysulfides (LiPSs) and intrinsic slow electrochemical transformation from LiPSs to Li2S/Li2S2 will induce undesirable cycling performance, which is the primary obstruct limiting the practical applications of lithium–sulfur (Li–S) batteries. Here a convenient method is designed to fabricate the 2D louts‐like N‐Co2VO4‐Co heterostructures with well‐abundant interfaces and oxygen vacancies (Vo), endowing the materials with both “sulfiphilic” and “lithiophilic” features. When employed as the modification layer coated on commercial Celgard 2400 separator, the as‐prepared N‐Co2VO4‐Co/PP with synergistic adsorption‐electrocatalysis effects achieves desirable sulfur electrochemistry, thus showing a high initial discharge capacity of 1466.4 mAh g−1 at 0.1 C and stable cycle life with a fade rate of 0.03% per cycle over 1000 cycle at 3.0 C. Moreover, a superior areal capacity of 12.84 mAh cm−2 is preserved under high sulfur loading of 14.3 mg cm−2.

A Facile Immobilization Strategy for Soluble Phosphazene to Actualize Stable and Safe Lithium–Sulfur Batteries

“…The LSBs with H-CMP@SP separator deliver the highest discharge capacity with the lowest polarization benefiting from its fast redox kinetics. [31] The cycle performance at 0.2 C was investigated to expound on the improvement in cycle stability of LSBs with the H-CMP@SP coating (Figure 5a). The LSBs with the PP separator deliver a capacity of 1095.5 mA h g -1 at the initial cycle but only 414.6 mA h g -1 remained after 100 cycles with a lowcapacity retention of only 37.8% owing to the severe shuttle effect.…”

A Review on Engineering Transition Metal Compound Catalysts to Accelerate the Redox Kinetics of Sulfur Cathodes for Lithium–Sulfur Batteries

“…Different modifications may present different advantages, so composite modifications should be developed to comprehensively improve the performance of sulfur catalysts. This can include constructing compounds with both multi-metals and multi-anions, doping heterostructure composites, compositing bimetallic TMCs and heterostructure, such as N-doped Co 2 VO 4 -Co heterostructure [ 184 ].…”