Towards practical cells: combined use of titanium black as a cathode additive and sparingly solvating electrolyte for high-energy-density lithium–sulfur batteries
| Autor: | Kaoru Dokko, Masayoshi Watanabe, Mayeesha Marium, Jiali Liu, Binshen Wang, Kazuhide Ueno, Shanglin Li |
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| Rok vydání: | 2021 |
| Předmět: |
Battery (electricity)
Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology chemistry.chemical_element Electrolyte engineering.material Cathode law.invention Contact angle chemistry.chemical_compound Fuel Technology Chemical engineering Coating chemistry law engineering Sulfolane Faraday efficiency Titanium |
| Zdroj: | Sustainable Energy & Fuels. 5:1821-1831 |
| ISSN: | 2398-4902 |
| Popis: | The lithium–sulfur (Li–S) battery is considered one of the most promising technologies for next-generation energy storage. To realise its practical applications, electrodes with high areal sulfur loading, low-cost raw materials, and easily accessible fabrication processes are essential. Herein, we demonstrated the effectiveness of a commercially available black pigment, titanium black (TiB), as a multi-functional additive for sulfur electrodes. Benefiting from the amphipathic nature of TiB, it was easy to obtain a homogenous coating on a current collector (>4 mg cm^(−2)) by applying a traditional slurry containing aqueous carboxymethyl cellulose/styrene-butadiene rubber as a binder. Contact angle measurements revealed much better electrolyte wettability for the electrode with the addition of TiB. Combined with a sparingly solvating electrolyte based on sulfolane and Li[N(SO_2CF_3)_2], the electrode showed excellent cycling performance and high coulombic efficiency at a relatively high current density. Finally, pouch cells were fabricated with a low electrolyte/sulfur (E/S) ratio of 3.2 μL mg^(−1), and a high energy density of 280 W h kg^(−1) was achieved. Subsequent investigation of the gassing behaviour revealed that swelling of the charged cells at 60 °C was suppressed for half a month. This study may pave the way for designing Li–S batteries with practical utility. |
| Databáze: | OpenAIRE |
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