Boosting Performance of Lithium Metal Batteries by Optimizing Multiple Interactions in Single-Ion Conducting Polymer Electrolytes with Salt Additives
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초록
내용
Lithium metal batteries offer high theoretical capacity and low redox potential, but they face safety problems due to the formation of uneven dendrites on the lithium metal. Thus, it is important to have high Li transference number for the suppression of dendrite growth. Even though Single-Ion Conducting Polymer Electrolytes (SIPEs) are considered one method to achieve this, they generally show low ion conductivity. To overcome such an issue, we propose salt-in-SIPE (SiSIPE) that combine SIPE and Li salt with NMA as a plasticizer. In this study, we confirmed the interaction between LITFSI and NMA, and this interaction inhibits the crystallinity and decomposition of NMA. Electrochemical tests demonstrated a high voltage stability of 4.4 V in LSV and a high critical current density of up to 0.6 mA/cm2. The enhanced performance of SiSIPE were demonstrated in both Li symmetric cells (0.1 mA cm-2, 700 hours) and LiFePO4 full cells (1 C-rate, 400 cycles, 80% retention).