TiS2–Polysulfide Hybrid Cathode with High Sulfur Loading and Low Electrolyte Consumption for Lithium–Sulfur Batteries,ACS Energy Letters

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TiS2–Polysulfide Hybrid Cathode with High Sulfur Loading and Low Electrolyte Consumption for Lithium–Sulfur Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-02-07 00:00:00 , DOI: 10.1021/acsenergylett.7b01321
Sheng-Heng Chung ₁ , Liu Luo ₁ , Arumugam Manthiram ₁

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Sulfur cathodes have a high theoretical capacity of 1675 mAh g^–1, making the lithium–sulfur batteries a promising technology for future energy-storage devices. However, their commercial viability is faced with challenges arising from intrinsic electrochemical instabilities and inappropriate cell fabrication parameters. We report here the feasibility of employing TiS₂ as a conductive polysulfide adsorbent, which allows the use of a high amount of electrochemically active polysulfides in building a TiS₂–polysulfide hybrid cathode. The hybrid cathode exhibits long cycle stability at a C/5 rate over 200 cycles with a high areal capacity and energy density of, respectively, 10 mAh cm^–2 and 20 mWh cm^–2, exceeding those of commercial LiCoO₂. Such an enhanced electrochemical performance is obtained in cells with a high sulfur content (65 wt %), high sulfur loading (12 mg cm^–2), high sulfur mass (12 mg/cathode), and a low electrolyte/sulfur ratio of just 5 μL mg^–1.

中文翻译：

高硫负荷和低电解质消耗的TiS _2-多硫化物混合阴极，用于锂硫电池

硫阴极的理论容量高达1675 mAh g ^–1，这使得锂硫电池成为未来储能设备的有希望的技术。然而，它们的商业可行性面临着固有的电化学不稳定性和不合适的电池制造参数所带来的挑战。我们在这里报告了将TiS ₂用作导电多硫化物吸附剂的可行性，该可行性允许在构建TiS _2-多硫化物杂化阴极时使用大量电化学活性多硫化物。混合阴极在200个循环中以C / 5速率表现出长循环稳定性，其高面积容量和能量密度分别为10 mAh cm ^–2和20 mWh cm ^–2，超过了商业LiCoO ₂。在具有高硫含量（65 wt％），高硫负载量（12 mg cm ^–2），高硫质量（12 mg /阴极）和低电解质/硫比的电池中获得了如此增强的电化学性能5μL毫克^–1。

更新日期：2018-02-07

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