High Voltage-Stabilized Graphdiyne Cathode Interface,Small

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High Voltage-Stabilized Graphdiyne Cathode Interface
Small ( IF 13.0 ) Pub Date : 2021-08-08 , DOI: 10.1002/smll.202102066
Qian Chang _{1,

2} , Fan Wang ₂ , Zicheng Zuo ₂ , Feng He ₂ , Yao Zhao ₂ , Fuyi Wang ₂ , Yuliang Li ₂

Affiliation

Suppressing the irreversible interfacial reactions is an important scientific bottleneck in the development of stable high-energy-density lithium-ion battery. The interfacial chemistry of graphdiyne (GDY) on the high-voltage cathode of LiNi_0.5Mn_1.5O₄ (LNMO) shows a very interesting process, in which the sp-hybridization carbon atoms chemically scavenge the hydrofluoric acid (HF) and in situ form the fluorinated GDY interface. It first turns the harmful HF into profit, and greatly enhances the interfacial stability and restrains the side reaction on the cathode under high working voltage. The GDY-coated LNMO cathode obviously alleviates the electrolyte degradation, achieves high Coulombic efficiency and reliability. Due to atomic-level selectivity and chemical trapping of HF by GDY, it effectively suppresses the dissolution of Mn, Ni elements. These results highlight the unparalleled advantages of GDY in the formation of high stable interfaces and protection of high-energy-density electrodes.

中文翻译：

高压稳定石墨炔阴极接口

抑制不可逆界面反应是发展稳定的高能量密度锂离子电池的重要科学瓶颈。石墨二炔 (GDY) 在 LiNi _0.5 Mn _1.5 O ₄高压阴极上的界面化学(LNMO) 显示了一个非常有趣的过程，其中 sp 杂化碳原子化学清除氢氟酸 (HF) 并原位形成氟化 GDY 界面。它首先将有害的HF转化为利润，大大提高了界面稳定性，抑制了高工作电压下阴极的副反应。GDY 涂层的 LNMO 正极明显减轻了电解液的降解，实现了高库仑效率和可靠性。由于原子级选择性和 GDY 对 HF 的化学捕获，它有效地抑制了 Mn、Ni 元素的溶解。这些结果突出了GDY在形成高稳定界面和保护高能量密度电极方面无与伦比的优势。

更新日期：2021-09-23

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