LiFePO4包覆的Li1.2Mn0.54Ni0.13Co0.13O2锂离子电池正极材料：增强的库伦效率和循环性能

HFCAS OpenIR

	LiFePO4包覆的Li1.2Mn0.54Ni0.13Co0.13O2锂离子电池正极材料：增强的库伦效率和循环性能
其他题名	LiFePO4-Coated Li1.2Mn0.54Ni0.13Co0.13O2 as Cathode Materials with High Coulombic Efficiency and Improved Cyclability for Li-Ion Batteries
	2017-01-01
发表期刊	物理化学学报
ISSN	1000-6818
摘要	采用简单水溶液法制备LiFePO4包覆的Li1.2Mn0.54Ni0.13Co0.13O2富锂正极材料，包覆后的材料分别经过400℃或500℃煅烧处理5 h。测试结果显示，400℃煅烧处理的包覆样品在0.1C（1C=300 mA·g-1）电流密度下充放电时，首次库仑效率可以高达91.9%，同时，首次放电比容量可达到295.0 mAh·g-1。此外，该包覆样品还具有良好的循环性能，在1C电流密度下循环100次放电比容量仍可保持在206.7 mAh·g-1。进一步的研究发现LiFePO4的包覆不仅可以提高Li1.2Mn0.54Ni0.13Co0.13O2富锂材料的首次库仑效率和循环稳定性能，而且还能够有效抑制材料在充放电过程中的电压衰减。上述电化学性能的有效提升主要归因于LiFePO4包覆层可以阻碍Li1.2Mn0.54Ni0.13Co0.13O2富锂材料与电解液之间的直接接触，减少副反应的发生，增强材料表面的结构稳定性，同时还可以为富锂材料提供额外的可逆容量。
其他摘要	In this work, we present a new design for a surface protective layer formed by a facile aqueous solution process in which a nano-architectured layer of LiFePO4 is grown on a Li-rich cathode material, Li1.2Mn0.54Ni0.13Co0.13O2. The coated samples are then calcined at 400 or 500℃ for 5 h. The sample after calcination at 400℃ demonstrates a high initial columbic efficiency of 91.9%, a large reversible capacity of 295.0 mAh·g-1 at 0.1C （1C=300 mA·g-1）, and excellent cyclability with a capacity of 206.7 mAh·g-1after 100 cycles at 1C. Meanwhile, voltage fading of the coated sample is effectively suppressed by protection offered by a LiFePO4 coating layer. These superior electrochemical performances are attributed to the coating layer, which not only protects the Li-rich cathode material from side reaction with the electrolyte and maintains the stability of the interface structure, but also provides excess reversible capacity.
关键词	锂离子电池富锂正极材料磷酸铁锂包覆高库仑效率循环性能
收录类别	CSCD
语种	中文
CSCD记录号	CSCD:6050668
引用统计	被引频次：1[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/57722
专题	中国科学院合肥物质科学研究院
推荐引用方式 GB/T 7714	. LiFePO4包覆的Li1.2Mn0.54Ni0.13Co0.13O2锂离子电池正极材料：增强的库伦效率和循环性能[J]. 物理化学学报,2017,033.
APA	(2017).LiFePO4包覆的Li1.2Mn0.54Ni0.13Co0.13O2锂离子电池正极材料：增强的库伦效率和循环性能.物理化学学报,033.
MLA	"LiFePO4包覆的Li1.2Mn0.54Ni0.13Co0.13O2锂离子电池正极材料：增强的库伦效率和循环性能".物理化学学报 033(2017).