Toothpaste-like Electrode: A Novel Approach to Optimize the Interface for Solid-State Sodium-Ion Batteries with Ultralong Cycle Life

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• 作者：Lilu Liu ; Xingguo Qi ; Qiang Ma ; Xiaohui Rong ; Yong-Sheng Hu ; Zhibin Zhou ; Hong Li ; Xuejie Huang ; Liquan Chen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：December 7, 2016
• 年：2016
• 卷：8
• 期：48
• 页码：32631-32636
• 全文大小：457K
• ISSN：1944-8252

文摘

A non-sintered method with toothpaste electrode for improving electrode ionic conductivity and reducing interface impedance is introduced in solid-state rechargeable batteries. At 70 °C, this novel solid-state battery can deliver a capacity of 80 mAh g^–1 in a voltage range of 2.5–3.8 V at 0.1C rate using layered oxide Na_0.66Ni_0.33Mn_0.67O₂, Na-β″-Al₂O₃ and sodium metal as cathode, electrolyte and anode, respectively. Moreover, the battery shows a superior stability and high reversibility, with a capacity retention of 90% after 10 000 cycles at 6C rate and a capacity of 79 mAh g^–1 is recovered when the current rate is returned to 0.1C. Furthermore, a very thick electrode with active material mass loading of 6 mg cm^–2 also presents a reasonable electrochemical performance. These results demonstrate that this is a promising approach to solve the interface problem and would open a new route in designing the next generation solid-state battery.