The spinel LiNi_(0.5)Mn_(1.5)O_(4)(LNMO)cathode active materials(CAMs)are considered a promising alternative to commercially available cathodes such as layered and polyanion oxide cathodes,primarily due to their notab...The spinel LiNi_(0.5)Mn_(1.5)O_(4)(LNMO)cathode active materials(CAMs)are considered a promising alternative to commercially available cathodes such as layered and polyanion oxide cathodes,primarily due to their notable safety and high energy density,particularly in their single-crystal type.Nevertheless,the industrial application of the LNMO CAMs is severely inhibited due to the interfacial deterioration and corrosion under proton-rich and high-voltage conditions.This study successfully designed and synthesized two typical types of crystal facets-exposed single-crystal LNMO CAMs.By tracking the electrochemical deterioration and chemical corrosion evolution,this study elucidates the surface degradation mechanisms and intrinsic instability of the LNMO,contingent upon their crystal facets.The(111)facet,due to its elevated surface energy,is found to be more susceptible to external attack compared to the(100)and(110)facets.Our study highlights the electrochemical corrosion stability of crystal plane engineering for spinel LNMO CAMs.展开更多
以不同的镍源和锰源采用共沉淀法制备LiNi_(0.5)Mn_(1.5)O_(4)正极材料,利用X射线衍射(XRD)、扫描电子显微镜(SEM)和电化学测试等手段,对制备的LiNi_(0.5)Mn_(1.5)O_(4)材料进行表征和分析。结果表明:以硫酸镍和硫酸锰为原料制得LiNi_(0...以不同的镍源和锰源采用共沉淀法制备LiNi_(0.5)Mn_(1.5)O_(4)正极材料,利用X射线衍射(XRD)、扫描电子显微镜(SEM)和电化学测试等手段,对制备的LiNi_(0.5)Mn_(1.5)O_(4)材料进行表征和分析。结果表明:以硫酸镍和硫酸锰为原料制得LiNi_(0.5)Mn_(1.5)O_(4)材料的XRD谱图没有杂质峰,SEM图像显示颗粒细小且分散均匀,电化学测试显示在0.2C下首次放电比容量为115.83 m Ah/g,相比于其他镍源和锰源制备的LiNi_(0.5)Mn_(1.5)O_(4)材料,具有更优的电化学性能。展开更多
基金supported by the National Natural Science Foundation of China (52374311)the National Natural Science Foundation of Shaanxi (2022KXJ-146)+3 种基金the Fundamental Research Funds for the Central Universities (D5000230091)Open project of Shaanxi Laboratory of Aerospace Power (2022ZY2-JCYJ-01-09)full-depth-sea battery project (No.2020-XXXX-XX-246-00)the Youth Innovation Team of Shaanxi Universities。
文摘The spinel LiNi_(0.5)Mn_(1.5)O_(4)(LNMO)cathode active materials(CAMs)are considered a promising alternative to commercially available cathodes such as layered and polyanion oxide cathodes,primarily due to their notable safety and high energy density,particularly in their single-crystal type.Nevertheless,the industrial application of the LNMO CAMs is severely inhibited due to the interfacial deterioration and corrosion under proton-rich and high-voltage conditions.This study successfully designed and synthesized two typical types of crystal facets-exposed single-crystal LNMO CAMs.By tracking the electrochemical deterioration and chemical corrosion evolution,this study elucidates the surface degradation mechanisms and intrinsic instability of the LNMO,contingent upon their crystal facets.The(111)facet,due to its elevated surface energy,is found to be more susceptible to external attack compared to the(100)and(110)facets.Our study highlights the electrochemical corrosion stability of crystal plane engineering for spinel LNMO CAMs.
文摘以不同的镍源和锰源采用共沉淀法制备LiNi_(0.5)Mn_(1.5)O_(4)正极材料,利用X射线衍射(XRD)、扫描电子显微镜(SEM)和电化学测试等手段,对制备的LiNi_(0.5)Mn_(1.5)O_(4)材料进行表征和分析。结果表明:以硫酸镍和硫酸锰为原料制得LiNi_(0.5)Mn_(1.5)O_(4)材料的XRD谱图没有杂质峰,SEM图像显示颗粒细小且分散均匀,电化学测试显示在0.2C下首次放电比容量为115.83 m Ah/g,相比于其他镍源和锰源制备的LiNi_(0.5)Mn_(1.5)O_(4)材料,具有更优的电化学性能。
