阳极
材料科学
法拉第效率
钠离子电池
离子电导率
钠
氧化物
离子
电解质
复合数
无机化学
快离子导体
阴极
化学
复合材料
电极
冶金
物理化学
有机化学
标识
DOI:10.1002/slct.202200620
摘要
A composite solid electrolyte based on PEO-NaTFSI (polyethylene oxide-sodium bis(trifluoromethanesulfonyl)imide) and Na3Zr2Si2PO12 is fabricated for all-solid-state Na−S battery (ASSB). When the molar ratio of EO (ethylene oxide of PEO) to Na+ (sodium ion of NaTFSI) is 20 and the amount of Na3Zr2Si2PO12 is 30 wt%, a highest ionic conductivity of 3.14×10−4 S cm−1 and the sodium ion transference number of 0.66 are achieved at 60 °C. Harnessing the electrolyte's improved sodium ion transport abilities enables ASSB's assembled with a sulfur cathode and sodium metal anode to exhibit highly reversible current-rates and capacity retention. At 0.2 C and 60 °C, the battery delivers a superior discharge capacity of 1110.0 mAh g−1 in the first cycle and maintains 666.8 mAh g−1 after 60 cycles with a stable Coulombic efficiency near 100 %.
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