Dispersing single-layered Ti3C2TX nanosheets in hierarchically-porous membrane for high-efficiency Li+ transporting and polysulfide anchoring in Li-S batteries

ZIF-67 on Sulfur-Functionalized Graphene Oxide for Lithium–Sulfur Batteries

“…17−20 Among those host materials, carbon-based electrode materials, such as porous carbon, 21 carbon nanotubes (CNTs), 22 graphene oxide (GO), 23,24 and their hybrids, 25−27 have shown absolute dominance due to the sufficient chemically active sites, good electrical conductivity, high mechanical strength, excellent resistance to volume expansion, and so on. 8,20,28 In 2011, sulfur-functionalized GO (GO-S) as a Li−S battery cathode was explored, which showed a high reversible capacity and Coulombic efficiency attributed to the C−S functional groups. 24 In the same year, MIL-100 (Cr) (the framework of chromium trimers and carboxylate moieties) was first employed as the electrode material for Li−S batteries, obtained with 1150−1170 mA h g −1 capacity at the first cycle and 500 mA h g −1 after 59 cycles at 0.1 C. 29 Recently, Pang et al designed a ZIF-67-S-PPy nanocomposite with a hollow structure as a cathode for Li−S batteries, 30 exhibiting a higher specific capacity and cycling performance (faded to 599.8 mAh g −1 at 0.1 C for 200 cycles), attributed to the binding force between Li 2 S x and Co 2+ , electroconductivity of PPy, and hollow structure of ZIF-67.…”

“…Many facts have proved that the ideal electrode materials for Li–S batteries must maintain a porous structure to embed/immobilize S and provide pathways for Li ions, meanwhile maintaining a close contact with S to facilitate electron transport. − Among those host materials, carbon-based electrode materials, such as porous carbon, carbon nanotubes (CNTs), graphene oxide (GO), , and their hybrids, − have shown absolute dominance due to the sufficient chemically active sites, good electrical conductivity, high mechanical strength, excellent resistance to volume expansion, and so on. ,, In 2011, sulfur-functionalized GO (GO-S) as a Li–S battery cathode was explored, which showed a high reversible capacity and Coulombic efficiency attributed to the C–S functional groups . In the same year, MIL-100 (Cr) (the framework of chromium trimers and carboxylate moieties) was first employed as the electrode material for Li–S batteries, obtained with 1150–1170 mA h g –1 capacity at the first cycle and 500 mA h g –1 after 59 cycles at 0.1 C .…”

Insights into the Pseudocapacitive Behavior of Sulfurized Polymer Electrodes for Li–S Batteries

“…This results in accumulation of sulfurspecies on the top surface of the cathode after repeated cycles resulting in loss of electric contact, blockage of ion transport into the cathode, increased electrode resistance, deactivated internal active materials, and fast cell failure. Sulfur/carbon (S/C) composites have been suggested as a strategy to tackle these material challenges, [1][2][3]5,6,[8][9][10][11][12][13][14][15][16][17] where carbon simultaneously serves as conductive agent, strong adsorbent or even a compartment impeding the dissolution of long-chain LiPS during cycling. At the cell-level, the specific energy of S/C composites is limited by 1) carbon "dead weight," [18,19] 2) high carbon porosity, necessitating larger amounts of electrolytes to sufficiently wet the cathode, adding weight to the cell and diminishing the specific energy, [19] and 3) low S-loadings (<5 mg cm −2 ).…”

In Situ Separator Modification with an N-Rich Conjugated Microporous Polymer for the Effective Suppression of Polysulfide Shuttle and Li Dendrite Growth

“…Many methods such as cathode construction, anode engineering, functional separators, and electrolyte additives have been used for inhibiting LiPS shuttle and Li dendrite growth. − Among all of the strategies, designing functional separators is effective and convenient. − Diverse materials including carbon materials, , metal compounds, − metal–organic frameworks (MOFs), , and clay minerals − have been used for modifying conventional separators. The functional separators can efficiently suppress LiPS shuttle or Li dendrite growth, yet rarely address the two issues simultaneously. , …”

“…The functional separators can efficiently suppress LiPS shuttle or Li dendrite growth, yet rarely address the two issues simultaneously. 26,27 Conjugated microporous polymers (CMPs) have inherent π-conjugated structures and nanopores. 28−30 CMPs have extended π-conjugated structures, superior chemical stability, designable molecular structure, and high specific surface area.…”