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通過雙摻雜增強(qiáng)Li7P2.9Sb0.1S10.65O0.15I0.2電解質(zhì)用于高性能全固態(tài)鋰硫電池

編號:CYYJ03476

篇名:通過雙摻雜增強(qiáng)Li7P2.9Sb0.1S10.65O0.15I0.2電解質(zhì)用于高性能全固態(tài)鋰硫電池

作者:趙博生 陳鵬 高學(xué)平

關(guān)鍵詞: 鋰硫電池 硫化物固體電解質(zhì) 放電比容量 離子導(dǎo)電性 空氣穩(wěn)定性 離子電導(dǎo)率 電極界面 鋰枝晶

機(jī)構(gòu): Institute of New Energy Material Chemistry

摘要: Sulfide solid electrolyte is a promising candidate for the development of high-energy lithium-sulfur(Li-S)batteries.However,the concurrent improvement of ionic conductivity,bulk air stability,and compatibility of the electrolyte/electrode interface of sulfide solid electrolyte remains a huge challenge.Herein,we propose a dual-source doping(Sb2O3and LiI)strategy to prepare a multifunctional sulfide solid electrolyte.Sb2O3can broaden the transmission path of lithium ions and improve the bulk stability,and LiI can inhibit the generation of lithium dendrites and reduce the electrolyte/electrode resistance.Therefore,the sulfide solid electrolyte can be strengthened in terms of its bulk and interface,thus exhibiting a high ionic conductivity of 1.69×10-3S cm-1at 30℃,high air stability,and high electrochemical stability with lithium metal.On this basis,the as-prepared all-solid-state Li-S batteries(ASSLSBs)can exhibit a high specific discharge capacity after being cycled at 0.05 C for 100 cycles at room temperature(833 mA h g-1)or 60℃(949 mA h g-1).This work provides a rational scheme for the preparation of practical sulfide solid electrolytes and high-performance ASSLSBs.

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