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    Molecular 'capturing' and 'seizing' MoS2/TiN interlayers suppress polysulfide shuttling and self-discharge of Li-S batteries

    Year: 2020

    Journal: Energy Storage Mater., Volume 27, MAY, page 333–341

    Authors: Waqas, Muhammad; Han, Yupei; Chen, Dongjiang; Ali, Shamshad; Zhen, Cheng; Feng, Chao; Yuan, Botao; Han, Jiecai; He, Weidong

    Organizations: Science & Technology Support Funds of Sichuan Province [2016GZ0151]; Fundamental Research Funds for the Chinese Central Universities [ZYGX2015Z003]

    Keywords: Lithium sulfur batteries; Shuttle effect; Self-discharge; Microfiber glass filter; Interlayer

    With high energy density and low cost, lithium sulfur (Li-S) batteries own the potential to be next-generation electrochemical storage/conversion devices. However, their cyclic stability and life span are considerably impaired by polysulfide shuttling and self-discharge. Here, we design a microfiber glass filter-molybdenum disulfide/carbon-titanium nitride (mu FGF-MoS2/C-TiN) interlayer for suppressing the shuttle of polysulfides and selfdischarge of Li-S batteries. TiN in the interlayer molecularly captures high-order polysulfide Li2S8 with an adsorption energy up to -6.48 eV, the largest high-order polysulfide absorption value ever reported. The mu FGF-MoS2 layer mechanically seizes polysulfides with interconnected torturous mesopores by functioning as a molecular sieve. With a sulfur loading of 4.5 mg cm(-2), the Li-S batteries based on mu FGF-MoS2/C-TiN exhibit remarkable over-1000-cycle stability with an only 0.05% capacity decay per cycle and deliver an initial discharge capacity of 1000 mAh g(-1) at 1C. The self-discharge is alleviated with an insignificant 10.3% capacity loss after a 30-day rest.
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