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Synthesis and electrochemical performance of (100-x)Li7P3S11-xLi3SI composite solid electrolyte for all-solid-state lithium batteries
Journal of Industrial and Engineering Chemistry ( IF 5.9 ) Pub Date : 2021-01-15 , DOI: 10.1016/j.jiec.2021.01.009
Su-Yeon Jung , Rajesh Rajagopal , Kwang-Sun Ryu

Li7P3S11 (LPS) solid electrolytes have great advantages, such as high lithium-ion conductivity, and can easily fabricate to make bulk-type all-solid-state lithium batteries. However, LPS has a disadvantage because of large interfacial resistance with lithium, which give a limitation for all-solid-state battery. In this study, (100-x)Li7P3S11-x Li3SI (x = 0. 2 and 5) solid electrolyte composites are prepared by mechanical ball milling process. Various physiochemical analysis was carried out to confirm the proper mixing of Li7P3S1 and Li3SI solid electrolytes. The addition of Li3SI solid electrolyte, effectively influence the ionic conductivity and electrochemical properties of the Li7P3S1 solid electrolyte. The prepared Li7P3S11/Li3SI solid electrolyte composites are stable against the lithium metal anode even after 100 h charge-discharging process and has stable potential window up to 10 V. In particular, 98Li7P3S11-2Li3SI solid electrolyte based ASSLBs shows the highest capacity, of 110 mA/g at the current density of 7.5 mA g−1 (0.05 C). The charge – discharge cycle stability test also proved the Li3SI mixing to Li7P3S11 helped to maintain the capacity retention value of ∼100 % after 10 cycles. Therefore, the Li3SI into the Li7P3S11 electrolyte helps improve the electrochemical performance.



中文翻译:

全固态锂电池用(100-x)Li 7 P 3 S 11 -xLi 3 SI复合固体电解质的合成及电化学性能

Li 7 P 3 S 11(LPS)固体电解质具有很大的优势,例如高锂离子传导性,并且可以容易地制造以制造块状全固态锂电池。然而,由于与锂的大的界面电阻,LPS具有缺点,这限制了全固态电池。在这项研究中,通过机械球磨工艺制备了(100-x)Li 7 P 3 S 11 -x Li 3 SI(x  =  0. 2和5)固体电解质复合材料。进行了各种理化分析,以确定Li 7 P 3 S 1和Li 3的正确混合SI固体电解质。Li 3 SI固体电解质的加入有效地影响了Li 7 P 3 S 1固体电解质的离子电导率和电化学性能。所制备的锂7 P 3小号11 /栗3 SI固体电解质复合物是对即使经过100负极的金属锂稳定 ħ充放电过程,并且具有稳定的电位窗长达10  V.特别地,98Li 7 P 3小号11 -基于2Li 3 SI固体电解质的ASSLBs 在7.5的电流密度下显示出110 mA / g的最高容量 mA g -1(0.05 C)。充放电循环稳定性测试还证明,将Li 3 SI与Li 7 P 3 S 11混合可以使10个循环后的容量保持率保持在约100%。因此,将Li 3 SI注入Li 7 P 3 S 11电解质中有助于改善电化学性能。

更新日期:2021-02-01
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