Effect of Surface Chemical Bonding States on Lithium Intercalation Properties of Surface‐Modified Lithium Cobalt Oxide
Effect of Surface Chemical Bonding States on Lithium Intercalation Properties of Surface‐Modified Lithium Cobalt Oxide
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DOI：
10.1002/batt.201800122
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发表时间：
2019-05
影响因子：
5.7
通讯作者：
Jun-ichi Hata;M. Hirayama;Kota Suzuki;N. Dupré;D. Guyomard;R. Kanno
中科院分区：
文献类型：
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作者：
Jun-ichi Hata;M. Hirayama;Kota Suzuki;N. Dupré;D. Guyomard;R. Kanno
了解表面改性嵌锂阴极和有机电解质之间的界面反应有助于设计锂离子电池的高功能阴极。这里，LiCoO 2阴极和ZrO 2 − x表面层之间的化学键合状态通过使用不同离子能量的脉冲电弧等离子体沉积来控制。分析了复合材料的嵌锂性能和界面结构的变化。通过ZrO 2 − x和LiCoO 2之间的相互作用形成的Zr−O−Co改性表面在高压操作（2.8-4.5 V）下提供了优异的上级循环稳定性。 X射线光电子能谱表明，Zr−O−Co表面形成了高度粘附的ZrOxFy作为阴极电解质中间相（CEI）。ZrO 2 −x/LiCoO 2界面的化学键合状态影响ZrO 2 − x与电解质物质的反应性以及CEI的结构，这可能决定锂嵌入阴极的电池性能。
Understanding interfacial reactions between surface‐modified lithium intercalation cathodes and organic electrolytes facilitates the design of highly functional cathodes for lithium‐ion batteries. Here, the chemical bonding state between a LiCoO2cathode and a ZrO2−xsurface layer is controlled by pulsed arc plasma deposition using different ion energies. The lithium intercalation properties and interfacial structure changes are subsequently analyzed. The Zr−O−Co‐modified surface formed by interaction between ZrO2−xand LiCoO2provides superior cycle stability under high‐voltage operation (2.8–4.5 V). X‐ray photoemission spectroscopy clarifies that the Zr−O−Co surface forms highly adhesive ZrOxFyas a cathode electrolyte interphase (CEI). The chemical bonding state at the ZrO2−x/LiCoO2interface affects the reactivity of ZrO2−xwith electrolyte species as well as the architecture of the CEI, which may determine the cell performances of lithium intercalation cathodes.