Interfacial Design for a 4.6 V High-Voltage Single-Crystalline LiCoO2 Cathode,Advanced Materials

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Interfacial Design for a 4.6 V High-Voltage Single-Crystalline LiCoO2 Cathode
Advanced Materials ( IF 27.4 ) Pub Date : 2021-12-08 , DOI: 10.1002/adma.202108353
Jiaxun Zhang ₁ , Peng-Fei Wang ₁ , Panxing Bai ₁ , Hongli Wan ₁ , Sufu Liu ₁ , Singyuk Hou ₁ , Xiangjun Pu ₁ , Jiale Xia ₁ , Weiran Zhang ₂ , Zeyi Wang ₁ , Bo Nan ₃ , Xiyue Zhang ₁ , Jijian Xu ₁ , Chunsheng Wang ₁

Affiliation

Single-crystalline cathode materials have attracted intensive interest in offering greater capacity retention than their polycrystalline counterparts by reducing material surfaces and phase boundaries. However, the single-crystalline LiCoO₂ suffers severe structural instability and capacity fading when charged to high voltages (4.6 V) due to Co element dissolution and O loss, crack formation, and subsequent electrolyte penetration. Herein, by forming a robust cathode electrolyte interphase (CEI) in an all-fluorinated electrolyte, reversible planar gliding along the (003) plane in a single-crystalline LiCoO₂ cathode is protected due to the prevention of element dissolution and electrolyte penetration. The robust CEI effectively controls the performance fading issue of the single-crystalline cathode at a high operating voltage of 4.6 V, providing new insights for improved electrolyte design of high-energy-density battery cathode materials.

中文翻译：

4.6 V 高压单晶 LiCoO2 阴极的界面设计

单晶阴极材料通过减少材料表面和相界来提供比多晶阴极材料更大的容量保持率，引起了人们的浓厚兴趣。然而，单晶 LiCoO ₂在充电至高电压（4.6 V）时由于Co元素溶解和O损失、裂纹形成以及随后的电解质渗透而遭受严重的结构不稳定和容量衰减。在此，通过在全氟化电解质中形成坚固的阴极电解质界面 (CEI)，在单晶 LiCoO _{2中沿 (003) 平面进行可逆平面滑动}由于防止元素溶解和电解质渗透，阴极受到保护。稳健的 CEI 有效控制了单晶正极在 4.6 V 高工作电压下的性能衰减问题，为改进高能量密度电池正极材料的电解质设计提供了新的见解。

更新日期：2021-12-08

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