Electrochemical Na-insertion/extraction properties of SnO thick-film electrodes prepared by gas-deposition

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• 作者：Masahiro Shimizu ; Hiroyuki Usui ; Hiroki Sakaguchi
• 关键词：SnO anode ; Na-ion battery ; Thick-film electrode ; Electrolyte additive ; Gas-deposition method
• 刊名：Journal of Power Sources
• 出版年：15 February, 2014
• 年：2014
• 卷：248
• 期：Complete
• 页码：378-382
• 全文大小：828 K

文摘

SnO thick-film electrodes for Na-ion battery anodes were prepared for the first time by a gas-deposition method, and we investigated the influence of fluoroethylene carbonate as an electrolyte additive on their anode performances. The SnO electrode showed high reversible capacities of 580聽mA聽h聽g^鈭? and 260聽mA聽h聽g^鈭? at the first cycle and at the 20th cycle, respectively, in an additive-free electrolyte. The cycle performance obtained was much higher than that of an Sn electrode. These results indicate that Na₂O formed in the first Na-insertion process played a role as a matrix to alleviate a stress generated by drastic volumetric changes during alloying/dealloying reactions of Sn with Na. When we used fluorothylene carbonate as an additive, the SnO electrode achieved 250聽mA聽h聽g^鈭? at the 50th cycle with a good capacity retention. The excellent cycle performance originates from a facile Na-ion transfer through a surface layer formed between the electrode and the electrolyte because the surface layer derived from additive prevents from making itself thicker by suppressing decomposition of the electrolyte.