Journal ArticleDOI
A new type of protective surface layer for high-capacity Ni-based cathode materials: nanoscaled surface pillaring layer.
TLDR
This material showed excellent structural stability due to a pillar layer, corresponding to 85% capacity retention between 3.0 and 4.5 V at 60 °C after 100 cycles, and the amount of heat generation was decreased by 40%, compared to LiNi0.15O2.Abstract:
A solid solution series of lithium nickel metal oxides, Li[Ni1–xMx]O2 (with M = Co, Mn, and Al) have been investigated intensively to enhance the inherent structural instability of LiNiO2. However, when a voltage range of Ni-based cathode materials was increased up to >4.5 V, phase transitions occurring above 4.3 V resulted in accelerated formation of the trigonal phase (P3m1) and NiO phases, leading to and pulverization of the cathode during cycling at 60 °C. In an attempt to overcome these problems, LiNi0.62Co0.14Mn0.24O2 cathode material with pillar layers in which Ni2+ ions were resided in Li slabs near the surface having a thickness of ∼10 nm was prepared using a polyvinylpyrrolidone (PVP) functionalized Mn precursor coating on Ni0.7Co0.15Mn0.15(OH)2. We confirmed the formation of a pillar layer via various analysis methods (XPS, HRTEM, and STEM). This material showed excellent structural stability due to a pillar layer, corresponding to 85% capacity retention between 3.0 and 4.5 V at 60 °C after 10...read more
Citations
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Journal ArticleDOI
Enhancement on inter-layer stability on Na-doped LiNi0.6Co0.2Mn0.2O2 cathode material
TL;DR: LiNi0.6Co0.2O2 cathode material with gradient modification of sodium ion doping is synthesized by milling-spray and calcination two-step method as discussed by the authors.
Journal ArticleDOI
Heating-temperature-dependent electrochemical-performance-enhanced surface structural evolution during chemical treatment of Li-rich layered material by sodium thiosulfate
TL;DR: In this paper, Li-rich layered oxide (LLO) is treated with a common reducing substance sodium thiosulfate (Na2S2O3) over a wide range of heating temperature.
Journal ArticleDOI
Roles of Mn and Co in Ni-rich layered oxide cathodes synthesized utilizing a Taylor Vortex Reactor
TL;DR: LiNiO2, LiNi0.9Mn0.1O2 and LiNi 0.9Co0.2 high Ni layered oxide cathodes synthesized by utilizing a Taylor Vortex Reactor were reported in this paper.
Journal ArticleDOI
Effect of copper and iron substitution on the structures and electrochemical properties of LiNi0.8Co0.15Al0.05O2 cathode materials
TL;DR: In this paper, the capacity of the commercialized cathode materials, such as lithium cobalt oxides (LiCoO2), lithium iron phosphate (LiFeO4), lithium manganese oxide (LiMn2O4) and LiNi0.8Co0.15Al0.6), has almost reached maximum value.
Journal ArticleDOI
Au-doped Li1.2Ni0.7Co0.1Mn0.2O2 electrospun nanofibers: synthesis and enhanced capacity retention performance for lithium-ion batteries
Bin Yue,Xinlu Wang,Jinxian Wang,Jing Yao,Xinru Zhao,Hongbo Zhang,Wensheng Yu,Guixia Liu,Xiangting Dong +8 more
TL;DR: In this paper, the impact of Au doping on the structure, morphology and electrochemical properties of samples is studied in detail, and the X-ray diffraction patterns demonstrate that appropriate Au-doping does not significantly change the structure of Li1.2Ni0.7Co0.1Mn0.2O2.
References
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TL;DR: The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations as mentioned in this paper.
Journal ArticleDOI
Challenges Facing Lithium Batteries and Electrical Double‐Layer Capacitors
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TL;DR: The Review will consider some of the current scientific issues underpinning lithium batteries and electric double-layer capacitors.
Journal ArticleDOI
Review of selected electrode–solution interactions which determine the performance of Li and Li ion batteries
TL;DR: In this article, the performance of Li, Li-C anodes and Li x MO y cathodes depends on their surface chemistry in solutions, which either contribute to electrode stabilization or to capacity fading due to an increase in the electrodes' impedance.
Journal ArticleDOI
Positive Electrode Materials for Li-Ion and Li-Batteries†
TL;DR: In this article, positive electrodes for Li-ion and lithium batteries have been under intense scrutiny since the advent of the Li ion cell in 1991, and a growing interest in developing Li−sulfur and Li−air batteries that have the potential for vastly increased capacity and energy density, which is needed to power large scale systems.
Journal ArticleDOI
High-energy cathode material for long-life and safe lithium batteries
TL;DR: The results suggest that the cathode material reported on could enable production of batteries that meet the demanding performance and safety requirements of plug-in hybrid electric vehicles.