The effect of a solid electrolyte interphase on the mechanism of operation of lithium–sulfur batteries

2015 ◽  
Vol 3 (39) ◽  
pp. 19873-19883 ◽  
Author(s):  
E. Markevich ◽  
G. Salitra ◽  
A. Rosenman ◽  
Y. Talyosef ◽  
F. Chesneau ◽  
...  
Keyword(s):  
Solid State ◽  
Solid Electrolyte ◽  
Solid Electrolyte Interphase ◽  
Surface Films ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

The formation of surface films on sulfur–carbon cathodes is responsible for a quasi-solid-state mechanism of sulfur lithiation in the micropores.

scholarly journals A chemically stabilized sulfur cathode for lean electrolyte lithium sulfur batteries

2020 ◽  
Vol 117 (26) ◽  
pp. 14712-14720 ◽  
Author(s):  
Chao Luo ◽  
Enyuan Hu ◽  
Karen J. Gaskell ◽  
Xiulin Fan ◽  
Tao Gao ◽  
...  
Keyword(s):  
Solid State ◽  
Energy Density ◽  
Solid Electrolyte ◽  
Solid Electrolyte Interphase ◽  
Carbon Matrix ◽  
High Energy ◽  
High Energy Density ◽  
Lithium Sulfur Batteries ◽  
Low Sulfur ◽  
Lithium Sulfur

Lithium sulfur batteries (LSBs) are promising next-generation rechargeable batteries due to the high gravimetric energy, low cost, abundance, nontoxicity, and high sustainability of sulfur. However, the dissolution of high-order polysulfide in electrolytes and low Coulombic efficiency of Li anode require excess electrolytes and Li metal, which significantly reduce the energy density of LSBs. Quasi-solid-state LSBs, where sulfur is encapsulated in the micropores of carbon matrix and sealed by solid electrolyte interphase, can operate under lean electrolyte conditions, but a low sulfur loading in carbon matrix (<40 wt %) and low sulfur unitization (<70%) still limit the energy density in a cell level. Here, we significantly increase the sulfur loading in carbon to 60 wt % and sulfur utilization to ∼87% by dispersing sulfur in an oxygen-rich dense carbon host at a molecular level through strong chemical interactions of C–S and O–S. In an all-fluorinated organic lean electrolyte, the C/S cathode experiences a solid-state lithiation/delithiation reaction after the formation of solid electrolyte interphase in the first deep lithiation, completely avoiding the shuttle reaction. The chemically stabilized C/S composite retains a high reversible capacity of 541 mAh⋅g−1(based on the total weight of the C/S composite) for 200 cycles under lean electrolyte conditions, corresponding to a high energy density of 974 Wh⋅kg−1. The superior electrochemical performance of the chemical bonding-stabilized C/S composite renders it a promising cathode material for high-energy and long-cycle-life LSBs.

Novel SeS2 doped Li2S-P2S5 solid electrolyte with high ionic conductivity for all-solid-state lithium sulfur batteries

2020 ◽  
Vol 380 ◽  
pp. 122419 ◽  
Author(s):  
Zhijun Wu ◽  
Zhengkun Xie ◽  
Akihiro Yoshida ◽  
Xiaowei An ◽  
Zhongde Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Ionic Conductivity ◽  
Solid Electrolyte ◽  
High Ionic Conductivity ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

All-solid-state lithium–sulfur batteries based on a newly designed Li7P2.9Mn0.1S10.7I0.3 superionic conductor

2017 ◽  
Vol 5 (13) ◽  
pp. 6310-6317 ◽  
Author(s):  
Ruo-chen Xu ◽  
Xin-hui Xia ◽  
Shu-han Li ◽  
Sheng-zhao Zhang ◽  
Xiu-li Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Ionic Conductivity ◽  
Solid Electrolyte ◽  
High Energy ◽  
Electrochemical Stability ◽  
Superionic Conductor ◽  
High Ionic Conductivity ◽  
Lithium Sulfur Batteries ◽  
Good Cycling Stability ◽  
Lithium Sulfur

A lithium superionic conductor of Li7P2.9Mn0.1S10.7I0.3 as solid electrolyte was successfully prepared via high-energy milling, possessing high ionic conductivity and excellent electrochemical stability. The prepared all solid state LSBs shows a large capacity of 796 mA h g−1 with good cycling stability.

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