A new type of composite electrolyte with high performance for room-temperature solid-state lithium battery
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Solid-state lithium batteries require the high energy density, easy processing and flexibility of electrolyte membranes. However, the low-temperature ionic conductivity and high interfacial impedance are still hindering the further application. Therefore, we developed the solution pouring method by using lithium bis(oxalate)borate (LiBOB) to prepare the PEO/LiBOB/LLZTO solid electrolyte for room-temperature solid-state lithium battery. Compared with the traditional LiPF6 as a lithium additive, the solid-state electrolytes with LiBOB as additive hold higher ionic conductivity and electrochemical window. Moreover, the fabricated solid-state LiFePO4|Li batteries own higher specific capacity and excellent cycle performance at room temperature (165.9 mAh g−1 with capacity retention of 84.6% after 100 cycles). The large volume of LiBOB could effectively decrease the crystallization state of PEO to improve the conductivity of Li+ ion by the increase in the amorphous region in the whole polymer electrolyte system. This study offers a feasible strategy of preparing solid electrolytes for room-temperature solid-state lithium battery with high performance.
This work was supported financially by The National Key R&D Program of China (No. 2016YFB0100201), Science Foundation of China University of Petroleum, Beijing (C201604, No. 2462014YJRC003), and State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University (No. 201703).
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Conflict of interest
The authors declare that they have no conflict of interest.
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