Lithium-sulfur batteries (LSBs) are among the most encouraging competitors for the next-generation energy storage system, nevertheless, the shuttle effect resulted from the soluble lithium polysulfides (LiPSs) and slow chemical kinetics hinder the pragmatic application of LSBs. To address those issues, herein, a uniform three-dimensional (3D) structure constructing carbon nanofibers (CNF) with polar Mo 2 C nanoparticles (Mo 2 C@CNF) was designed and coated onto one side of pristine conventional polypropylene separator (Mo 2 C@CNF/PP). The Mo 2 C@CNF with high electrical conductivity not only chemically constrained the LiPSs by chemical trapping, but also catalyzed the conversion of LiPSs to Li 2 S 2 /Li 2 S. Cells with Mo 2 C@CNF/PP separator presented a high specific capacity of 732.9 mAh g À 1 ; 500 mAh g À 1 was kept, due to sluggish capacity decay (0.063 % per cycle), after 500 cycles. Judging from the outstanding electrochemical performance of batteries with the Mo 2 C@CNF/PP separator, the proposal is an enlightening strategy for the advancement highperformance LSBs.

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In order to reduce the weight of the car, which made molded plastic door through rotational molding process. According to characteristics of rotational molding process, design plastic doors structure using UG software. By contrast the design of traditional sheet metal door, introduces the rotational molding process several key technologies of structure design of door from the simple molding, doors internal strengthening of structures and accessories.