Low‐Cost Hollow Mesoporous Polymer Spheres and All‐Solid‐State Lithium,Sodium Batteries |
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Authors: | Weidong Zhou Hongcai Gao John B Goodenough |
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Institution: | Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX, USA |
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Abstract: | A practical, low‐cost synthesis of hollow mesoporous organic polymer (HMOP) spheres is reported. The electrochemical properties of Li+/Na+‐electrolyte membranes with these spheres substituting for oxide filler particles in poly(ethylene oxide) (PEO)‐filler composite are explored. The electrolyte membranes are mechanically robust, thermally stable to over 250 °C, and block dendrites from a metallic‐lithium/sodium anode. The Li+/Na+ transfer impedance across the lithium/sodium–electrolyte interface is initially acceptable at 65 °C and scavenging of impurities by the porous‐spheres filler lowers this impedance relative to that with Al2O3. All‐solid‐state Li/LiFePO4 and Na/NaTi2(PO4)3 cells give stable discharge capacity of ≈130 and 80 mAh g?1, respectively, at 0.5 C and 65 °C for 100 cycles. |
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Keywords: | hollow polymer spheres lithium/sodium ions batteries solid state electrolytes |
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