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Increasing Poly(ethylene oxide) Stability to 4.5 V by Surface Coating of the Cathode
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-02-25 , DOI: 10.1021/acsenergylett.9b02739 Kaihui Nie 1, 2 , Xuelong Wang 1 , Jiliang Qiu 1, 2 , Yi Wang 3 , Qi Yang 1 , Jingjing Xu 1 , Xiqian Yu 1, 2, 4 , Hong Li 1, 2, 4 , Xuejie Huang 1 , Liquan Chen 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-02-25 , DOI: 10.1021/acsenergylett.9b02739 Kaihui Nie 1, 2 , Xuelong Wang 1 , Jiliang Qiu 1, 2 , Yi Wang 3 , Qi Yang 1 , Jingjing Xu 1 , Xiqian Yu 1, 2, 4 , Hong Li 1, 2, 4 , Xuejie Huang 1 , Liquan Chen 1
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Successfully commercialized poly(ethylene oxide) (PEO)-based solid polymer batteries (SPBs) are expected to continuously play a key role in the next generation of high-energy density lithium-ion battery technologies. However, the introduction of high-voltage cathodes, accompanied by safety concerns such as PEO decomposition and the associated gas release, is worthy of more attention. This study employs in situ DEMS to study the gassing behavior of LiCoO2|PEO-LiTFSI|Li SPBs. The experiments, together with theory calculations, reveal that a surface catalytic effect of LiCoO2 is the root cause of the unexpected H2 gas release of PEO-based SPBs at 4.2 V. The surface coating of LiCoO2 with a stable solid electrolyte Li1.4Al0.4Ti1.6(PO4)3 (LATP) can mitigate such a surface catalytic effect and therefore extend the stable working voltage to >4.5 V. The crossover effect of HTFSI, which is generated at the cathode side due to oxidation/dehydration of PEO and reacts with lithium at the anode side, is proposed to explain the H2 generation behavior.
中文翻译：
通过阴极的表面涂层将聚环氧乙烷的稳定性提高到4.5 V
有望成功实现商业化的基于聚环氧乙烷（PEO）的固态聚合物电池（SPB）在下一代高能量密度锂离子电池技术中继续发挥关键作用。但是，高压阴极的引入以及诸如PEO分解和相关气体释放等安全隐患值得更多关注。本研究采用原位DEMS来研究LiCoO 2 | PEO-LiTFSI | Li SPB的析气行为。实验以及理论计算表明，LiCoO 2的表面催化作用是4.2 V下PEO基SPB意外释放H 2气体的根本原因。具有稳定的固体电解质Li 1.4的LiCoO 2表面涂层Al 0.4 Ti 1.6（PO 4）3（LATP）可以减轻这种表面催化作用，因此可以将稳定的工作电压扩展到> 4.5V。HTFSI的交叉作用是由于阴极的氧化/脱水而在阴极侧产生的。提出了PEO与阳极侧的锂发生反应的方法，以解释H 2的生成行为。
更新日期：2020-02-25
中文翻译：
通过阴极的表面涂层将聚环氧乙烷的稳定性提高到4.5 V
有望成功实现商业化的基于聚环氧乙烷（PEO）的固态聚合物电池（SPB）在下一代高能量密度锂离子电池技术中继续发挥关键作用。但是，高压阴极的引入以及诸如PEO分解和相关气体释放等安全隐患值得更多关注。本研究采用原位DEMS来研究LiCoO 2 | PEO-LiTFSI | Li SPB的析气行为。实验以及理论计算表明，LiCoO 2的表面催化作用是4.2 V下PEO基SPB意外释放H 2气体的根本原因。具有稳定的固体电解质Li 1.4的LiCoO 2表面涂层Al 0.4 Ti 1.6（PO 4）3（LATP）可以减轻这种表面催化作用，因此可以将稳定的工作电压扩展到> 4.5V。HTFSI的交叉作用是由于阴极的氧化/脱水而在阴极侧产生的。提出了PEO与阳极侧的锂发生反应的方法，以解释H 2的生成行为。
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