title: Synergistic Design of Cathode Region for the High-Energy-Density Li-S Batteries.
abstract: The synergistic design of cathode region was conducted to minimize the shuttle effect of polysulfides and decrease the loading of inactive components in order to acquire high-energy-density lithium-sulfur (Li-S) batteries. The well-designed cathode region presented two special characteristics: one was the intertwined nanofibers interlayer based on ultrafine TiO2nanocrystal uniformly embedded within N-doping porous carbon; the other was the lightweight and three-dimensional current collector of fibrous cellulose paper coated by reduced graphene oxide. In consequence, the decent reversible capacity of 874.8 mA h g-1was acquired at 0.1 C with a capacity retention of 91.83% after 100 cycles. Besides, the satisfactory capacity of 670 mA h g-1was delivered after 300 cycles at 1 C with the small decay rate of only 0.08%. Because of higher capacity and lower loading of inactive component in cathode region, the energy density of cell increased more than five times compared with unmodified cell. Moreover, to further enhance the energy density, the high-sulfur-loading electrode was fabricated. A good areal capacity of 4.27 mA h cm-2was retained for the cell with the active material of 4 mg cm-2and the cycle stability was also well-maintained. In addition, due to the flexibility of interlayer and current collector, Li-S full cell (in pouch cell format) was easily curved. Therefore, the synergistic design for cathode region, which combines the flexible and mass-produced interlayer and current collector together, provides an effective access to Li-S batteries with high energy density and flexibility for practical application.
authors.affiliation: Faculty of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University , Changchun 130024, China.
authors.forename: Chao-Ying
authors.initials: CY
authors.lastname: Fan
authors.affiliation: Faculty of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University , Changchun 130024, China.
authors.forename: Si-Yu
authors.initials: SY
authors.lastname: Liu
authors.affiliation: Faculty of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University , Changchun 130024, China.
authors.forename: Huan-Huan
authors.initials: HH
authors.lastname: Li
authors.affiliation: Faculty of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University , Changchun 130024, China.
authors.forename: Hai-Feng
authors.initials: HF
authors.lastname: Wang
authors.affiliation: Faculty of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University , Changchun 130024, China.
authors.forename: Han-Chi
authors.initials: HC
authors.lastname: Wang
authors.affiliation: Faculty of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University , Changchun 130024, China.
authors.forename: Xing-Long
authors.initials: XL
authors.lastname: Wu
authors.affiliation: Faculty of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University , Changchun 130024, China.
authors.forename: Hai-Zhu
authors.initials: HZ
authors.lastname: Sun
authors.affiliation: Faculty of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University , Changchun 130024, China.
authors.forename: Jing-Ping
authors.initials: JP
authors.lastname: Zhang
keywords: Li−S batteries; TiO2 interlayer; cathode region; high energy density; lightweight current collector