Highly Safe Electrolyte Enabled via Controllable Polysulfide Release and Efficient Conversion for Advanced Lithium-Sulfur Batteries.,Small

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Highly Safe Electrolyte Enabled via Controllable Polysulfide Release and Efficient Conversion for Advanced Lithium-Sulfur Batteries.
Small ( IF 13.0 ) Pub Date : 2020-01-09 , DOI: 10.1002/smll.201905737
Ben Tang _{1,

2} , Han Wu ₁ , Xiaofan Du ₁ , Xiangyang Cheng ₁ , Xing Liu ₁ , Zhe Yu ₁ , Jinfeng Yang _{1,

2} , Min Zhang ₁ , Jianjun Zhang ₁ , Guanglei Cui ₁

Affiliation

Conventional lithium-sulfur batteries often suffer from fatal problems such as high flammability, polysulfide shuttling, and lithium dendrites growth. Here, highly-safe lithium-sulfur batteries based on flame-retardant electrolyte (dimethoxyether/1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether) coupled with functional separator (nanoconductive carbon-coated cellulose nonwoven) to resolve aforementioned bottle-neck issues are demonstrated. It is found that this flame-retardant electrolyte exhibits excellent flame retardancy and low solubility of polysulfide. In addition, Li/Li symmetrical cells using such flame-retardant electrolyte deliver extraordinary long-term cycling stability (less than 10 mV overpotential) for over 2500 h at 1.0 mA cm-2 and 1.0 mAh cm-2 . Moreover, bare sulfur cathode-based lithium-sulfur batteries using this flame retardant electrolyte coupled with nanoconductive carbon-coated cellulose separator can retain 83.6% discharge capacity after 200 cycles at 0.5 C. Under high charge/discharge rate (4 C), lithium-sulfur cells still show high charge/discharge capacity of ≈350 mAh g-1 . Even at an elevated temperature of 60 °C, discharge capacity of 870 mAh g-1 can be retained. More importantly, high-loading bare sulfur cathode (4 mg cm-2 )-based lithium-sulfur batteries can also deliver high charge/discharge capacity over 806 mAh g-1 after 56 cycles. Undoubtedly, the strategy of flame retardant electrolyte coupled with carbon-coated separator enlightens highly safe lithium-sulfur batteries at a wide range of temperature.

中文翻译：

通过可控的多硫化物释放和高效转化来实现高级锂硫电池的高度安全电解液。

常规的锂硫电池经常遭受致命的问题，例如高易燃性，多硫化物穿梭和锂枝晶生长。此处，基于具有阻燃性电解质（二甲氧基醚/ 1,1,2,2-四氟乙基2,2,3,3-四氟丙基醚）和功能性隔板（纳米导电碳包覆纤维素无纺布）的高安全性锂硫电池解决了上述瓶颈问题。发现该阻燃电解质表现出优异的阻燃性和多硫化物的低溶解度。此外，使用此类阻燃电解质的Li / Li对称电池在1.0 mA cm-2和1.0 mAh cm-2下可在2500小时内提供出色的长期循环稳定性（低于10 mV超电势）。此外，使用这种阻燃电解质和纳米导电碳涂层纤维素隔膜的裸露硫磺阴极基锂硫电池，在0.5 C下200次循环后，仍可保持83.6％的放电容量。在高充放电速率（4 C）下，锂硫电池仍然显示≈350mAh g-1的高充电/放电容量。即使在60°C的高温下，也可以保持870 mAh g-1的放电容量。更重要的是，经过56次循环后，高负载裸硫阴极（4 mg cm-2）基锂硫电池也可以提供超过806 mAh g-1的高充电/放电容量。毫无疑问，阻燃电解质与碳涂层隔板相结合的策略可以在很宽的温度范围内启发高度安全的锂硫电池。

更新日期：2020-02-07

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