摘要
为提升尖晶石相LiNi_(0.5)Mn_(1.5)O_(4)正极材料在深度荷电状态下的界面稳定性,采用原子层沉积法在单晶LiNi_(0.5)Mn_(1.5)O_(4)正极材料表面可控沉积了纳米级Al_(2)O_(3)层。改性后的LiNi_(0.5)Mn_(1.5)O_(4)正极材料表现出优异的长循环耐腐蚀性能(1C电流密度下循环500次的容量保持率高达94.7%)。进一步的表界面解析结果表明:原子层沉积技术构建的纳米级Al_(2)O_(3)包覆层能够明显抑制材料本体与电解液的腐蚀反应,降低过渡金属离子的不可逆溶解与析出;另外,基于HF表面刻蚀产生的AlF_(3)具有增强的耐刻蚀性能,可显著提升LiNi_(0.5)Mn_(1.5)O_(4)正极材料在长循环及高电压下的服役性能。
To improve the interfacial stability of spinel phase LiNi_(0.5)Mn_(1.5)O_(4)cathode material in deeply charged state,a nanoscale Al_(2)O_(3)film was deposited on the surface of single-crystal LiNi_(0.5)Mn_(1.5)O_(4) by atomic layer deposition in a controlled manner.The modified cathode material exhibits excellent long-cycle performance and corrosion resistance(with capacity retention rate up to 94.7%after 500 cycles at 1C).The surface and interface analysis shows that the nanoscale Al_(2)O_(3)coating deposited by atomic layer deposition technology can significantly inhibit the corrosion reaction between material and electrolyte,and also constrain the irreversible dissolution and precipitation of transition metal ions.In addition,AlF3 produced by HF surface etching can enhance corrosion resistance of LiNi_(0.5)Mn_(1.5)O_(4)cathode material,which can thus improve its long-cycle performance and the service performance at high voltage.
作者
李倩
赵妍
崔雅茹
王硕然
黄娜
李常林
王文培
马红周
杜金晶
何喜红
翁雅青
LI Qian;ZHAO Yan;CUI Yaru;WANG Shuoran;HUANG Na;LI Changlin;WANG Wenpei;MA Hongzhou;DU Jinjing;HE Xihong;WENG Yaqing(School of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,Shaanxi,China;Institute of Applied Chemistry,Jiangxi Academy of Sciences,Nanchang 330012,Jiangxi,China)
出处
《矿冶工程》
CAS
北大核心
2024年第4期8-12,共5页
Mining and Metallurgical Engineering
基金
国家重点研发计划(2023YFC3905904)
陕西省自然科学基金(2020JQ-679,2019JLM-36)
陕西省重点实验室项目(20JS064)
陕西省区域创新能力引导计划(2022QFY10-05)。
