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Sn/C composite anodes for bulk-type all-solid-state batteries
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DOI：10.1016/j.electacta.2021.139104.png)
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Abstract
En 中文
A simple method of realizing all-solid-state lithium batteries (ASS-LIBs), employing a Sn/C composite anode and glassy solid electrolyte LiI-Li3PS4 (LPSI), possessing desirable capacity and cycle life, is proposed. The composite anode, containing Sn/C, LPSI, and carbon fiber, is synthesized via a straightforward, one-step, manual grinding. Potentiodynamic cycling with galvanostatic acceleration (PCGA) analysis and cyclic voltammetry of Sn/C vertical bar LPSI vertical bar Li cells demonstrate that electrochemical processes of graphite are promoted by integrating it with Sn. The improvement appears as increased battery capacity in galvanostatic charge-discharge cycling. The Sn/C vertical bar LPSI vertical bar Li exhibits a capacity of 400 mAh g(-1) in the 1st cycle at 0.033C, which is about 83% of the nominal capacity of the composite. Throughout the course of 30 cycles, the cell retains a capacity above 320 mAh g(-1) and a coulombic efficiency above 98%. The retention of its high capacity suggests that the pulverization of Sn was physically suppressed by using solid-state materials, i.e. LPSI and graphite. It is demonstrated that the combination of LPSI electrolyte and Sn/C enables a simple and time-efficient preparation of ASS-LIBs with stable and safe performance. (C) 2021 Elsevier Ltd. All rights reserved.
Keywords:
All-solid-state lithium ion batteries
Tin-carbon anode
Glassy electrolytes
Lithium thiophosphate