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Sol/Antisolvent Coating for High Initial Coulombic Efficiency and Ultra-stable Mechanical Integrity of Ni-Rich Cathode Materials
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-09-27 , DOI: 10.1021/acsami.2c10613 Xiaoqing Zhang 1, 2 , Jianwei Xiong 1 , Fengzhen Chang 1 , Zhuijun Xu 1 , Zheng Wang 2 , Philip Hall 2, 3 , Ya-Jun Cheng 1 , Yonggao Xia 1, 4
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-09-27 , DOI: 10.1021/acsami.2c10613 Xiaoqing Zhang 1, 2 , Jianwei Xiong 1 , Fengzhen Chang 1 , Zhuijun Xu 1 , Zheng Wang 2 , Philip Hall 2, 3 , Ya-Jun Cheng 1 , Yonggao Xia 1, 4
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The Ni-rich cathode holds great promise for high energy density lithium-ion batteries because of its high capacity and operating voltage. However, crucial problems such as cation disorder, structural degradation, side reactions, and microcracks become serious with increasing nickel content. Herein, a novel and facile sol/antisolvent coating modification of Ni-rich layered oxide LiNi0.85Co0.1Mn0.05O2 (NCM) is developed where we use ethanol to disperse the nanosized LiBO2 to form the sol and adopt tetrahydrofuran (THF) as antisolvent to prepare the cluster of nanoparticles to be coated on the surface of NCM. The coating thickness can be tuned through the THF addition amount. The LiBO2 nanorod deposition is formed as well over the crack of the NCM cathode, likely acting as a patch to repair the original defect of the intrinsic crack. The uniform LiBO2 nanospherical particle coating together with LiBO2 nanorod wrapping provides a double protection against electrolytes. Compared with the raw material, LiBO2-coated LiNi0.85Co0.1Mn0.05O2 (LiBO2-coated NCM) exhibits a high initial Coulombic efficiency of 90.3% at 0.2 C between 2.8 and 4.3 V vs Li+/Li, a superior rate capability, enhanced fast charge property at 3 C, and restricted microcrack formation. This simple in-site modification and repairing technology guarantees a good mechanical integrity of the polycrystalline Ni-rich cathode.
中文翻译：
用于富镍正极材料的高初始库仑效率和超稳定机械完整性的溶胶/抗溶剂涂层
富镍正极因其高容量和高工作电压而有望成为高能量密度锂离子电池。然而，随着镍含量的增加，阳离子无序、结构降解、副反应和微裂纹等关键问题变得越来越严重。在此，我们开发了一种新颖且简便的溶胶/抗溶剂涂层改性富镍层状氧化物 LiNi 0.85 Co 0.1 Mn 0.05 O 2 (NCM)，我们使用乙醇分散纳米级 LiBO 2形成溶胶并采用四氢呋喃 (THF)作为抗溶剂来制备纳米颗粒簇以涂覆在NCM表面上。涂层厚度可以通过 THF 添加量进行调整。立博2纳米棒沉积也在 NCM 阴极的裂纹上形成，可能充当修补本征裂纹的原始缺陷的补丁。均匀的 LiBO 2纳米球形颗粒涂层与 LiBO 2纳米棒包裹一起提供了对电解质的双重保护。与原材料相比，LiBO 2包覆的LiNi 0.85 Co 0.1 Mn 0.05 O 2 (LiBO 2包覆的NCM)在0.2 C、2.8和4.3 V vs Li +之间表现出90.3%的高初始库仑效率/Li，优异的倍率性能，增强的 3 C 快速充电性能，并限制微裂纹的形成。这种简单的现场修改和修复技术保证了多晶富镍阴极的良好机械完整性。
更新日期：2022-09-27
中文翻译：
用于富镍正极材料的高初始库仑效率和超稳定机械完整性的溶胶/抗溶剂涂层
富镍正极因其高容量和高工作电压而有望成为高能量密度锂离子电池。然而，随着镍含量的增加，阳离子无序、结构降解、副反应和微裂纹等关键问题变得越来越严重。在此，我们开发了一种新颖且简便的溶胶/抗溶剂涂层改性富镍层状氧化物 LiNi 0.85 Co 0.1 Mn 0.05 O 2 (NCM)，我们使用乙醇分散纳米级 LiBO 2形成溶胶并采用四氢呋喃 (THF)作为抗溶剂来制备纳米颗粒簇以涂覆在NCM表面上。涂层厚度可以通过 THF 添加量进行调整。立博2纳米棒沉积也在 NCM 阴极的裂纹上形成，可能充当修补本征裂纹的原始缺陷的补丁。均匀的 LiBO 2纳米球形颗粒涂层与 LiBO 2纳米棒包裹一起提供了对电解质的双重保护。与原材料相比，LiBO 2包覆的LiNi 0.85 Co 0.1 Mn 0.05 O 2 (LiBO 2包覆的NCM)在0.2 C、2.8和4.3 V vs Li +之间表现出90.3%的高初始库仑效率/Li，优异的倍率性能，增强的 3 C 快速充电性能，并限制微裂纹的形成。这种简单的现场修改和修复技术保证了多晶富镍阴极的良好机械完整性。
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