Development and Implementation of a New Solid-State Battery Testing Tool
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Date
2020-05
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Publisher
The Ohio State University
Abstract
Since lithium-ion batteries have become the sought-after battery in today's market, they can be found in many devices we use every day such as cell phones, laptops, and electric vehicles. One major issue with this advancement is that there has not been much progression in the cell design of all solid-state batteries. Therefore, I propose to design a new solid-state battery cell that will facilitate electrochemical reaction between electrodes and solid electrolyte by allowing high pressure and heat to be externally applied. In addition, the new cell design will need to maintain a gas-tight seal around the components to allow researchers the ability to test air sensitive materials. My goal is to produce a design that will outperform the current commercial solid-state battery cell, while maintaining a smaller design for more practical laboratory use. In particular, the aim of mechanical design is to achieve a pressure on the battery components that is larger than 20 MPa. This high pressure would be exerted by a hydraulic press once the three compounds have been placed in the battery cell. After repeated mechanical designs and fabrication of a prototype, 303 MPa could be achieved on the battery components while heating to 200°C and confirming an air-tight sealing of the cell. The new cell is also more compact with a decrease in dimensions by approximately 30%, making use easier inside of an Argon-filled glovebox. In addition, the proper quantity of composite LiNbO3-LiCoO2 cathode, Li10GeP2S12 electrolyte, and indium anode has been identified to build a functional cell. The tooling can also facilitate better heat transfer to the battery compounds while also achieving a higher working temperature. The results have shown that using 303 MPa on the battery compounds while applying 200°C for 45 minutes, can achieve an open circuit voltage of 3.6 volts vs LiIn/Li+ and a specific capacity of 100 g/mAh.
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Keywords
Solid electrolyte, Solid-State battery, Battery testing tool, Battery performance