Suppression Mechanisms of the Solid-Electrolyte Interface Formation at the Triple-Phase Interfaces in Thin-Film Li-Ion Batteries
Suppression Mechanisms of the Solid-Electrolyte Interface Formation at the Triple-Phase Interfaces in Thin-Film Li-Ion Batteries
复制标题
薄膜锂离子电池三相界面固体电解质界面形成的抑制机制
DOI：
10.1021/acsami.1c05090
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Itoh Mitsuru
中科院分区：
文献类型：
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作者：
Yasuhara Sou;Yasui Shintaro;Teranishi Takashi;Sakata Osami;Hoshina Takuya;Tsurumi Takaaki;Majima Yutaka;Itoh Mitsuru
锂离子电池（LIB）中充电/放电的副反应在电极表面上产生固体电解质界面（SEI），导致电池寿命的降低。SEI形成的抑制已经引起了人们对获得更长的可循环LIB的关注。我们的研究小组以前曾报道，在具有优异的循环性和超高速充电性的LIB中，在由BaTiO 3、LiCoO 2和电解质界面组成的三相界面（TPI）处观察到很少的SEI。在TPI的SEI形成的抑制机制的调查应产生重要的信息，了解不良的副反应。因此，我们通过制备外延薄膜和评价电化学处理后样品的表面，探索了抑制SEI形成的机制。X射线光电子能谱（XPS）和扫描电子显微镜（SEM）的结果表明，在TPIs处，LiPF 6的分解受到抑制，说明通过LiPF 6分解生成PF 5有助于SEI的形成。
Side reactions of the charge/discharge in Li-ion batteries (LIBs) generate a solid-electrolyte interface (SEI) onto an electrode surface, resulting in the degradation of the lifetime of a cell. The suppression of SEI formations has attracted much attention for achieving longer cyclable LIBs. Our research group has previously reported that few SEI were observed at triple-phase interfaces (TPIs) consisting of BaTiO3, LiCoO2, and electrolyte interfaces in LIBs with excellent cyclability and ultrahigh-speed chargeability. An investigation on the suppression mechanisms of SEI formations at TPIs should yield important information on understanding the undesirable side reactions. Therefore, we have explored the suppression mechanisms of SEI formations by preparing epitaxial thin films and evaluating the surface of the samples after the electrochemical treatment. The results of X-ray photoelectron spectroscopy and scanning electron microscopy with energy-dispersive X-ray analysis measurements suggested that the decomposition of LiPF6was suppressed at TPIs, implying that the generation of PF5via the decomposition of LiPF6contributed to SEI formation.