Affiliation:
1. Central Research Institute of Electric Power Industry 240-0196 Yokosuka Japan
Abstract
AbstractAll‐oxide solid‐state sodium batteries (AOSSSBs), which are composed of oxide electrolytes and oxide active materials with sodium‐ion carriers, have attracted attention because of their high safety and material abundance. However, the operating voltage of AOSSSBs is inevitably low because the number of active materials available for use in AOSSSBs is restricted by undesirable reactions at electrolyte/electrode interfaces during high‐temperature fabrication. Herein, we fabricate AOSSSBs using a Na superionic conductor‐type solid electrolyte Na3Zr2(SiO4)2(PO4) (NZSP), a Na superionic conductor‐type negative active material NaTi2(PO4)3, and a mixed‐phosphate cathode active material Na4Ni3(PO4)2(P2O7) by a Na2B4O7 ⋅ 10H2O‐assisted low‐temperature fabrication technique. The obtained NaTi2(PO4)3/NZSP/Na4Ni3(PO4)2(P2O7) batteries exhibit an average discharge voltage of 3.1 V, which is the highest voltage ever reported in AOSSSBs. In addition, Na2B4O7 ⋅ 10H2O‐containing NZSP electrolytes show a wider electrochemical window in comparison with the pristine NZSP, enabling the batteries to endure a wide voltage operation (a capacity retention of 71 % after 10 cycles of charge/discharge in 0–5.1 V).
Funder
New Energy and Industrial Technology Development Organization
Subject
Electrochemistry,Electrical and Electronic Engineering,Energy Engineering and Power Technology
Cited by
1 articles.
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