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
Enhanced elevated-temperature performance of Li(Ni0.8Co0.15Al0.05)O2 electrodes coated with Li2O-2B2O3 glass
TL;DR: In this article, Li(Ni 0.8 Co 0.15 Al 0.05 )O 2 was shown to have suppressed structure deterioration and transition metal dissolution at elevated temperature by the variation in differential capacity and low open circuit voltage decay values.
Journal ArticleDOI
Pre-oxidizing the precursors of Nickel-rich cathode materials to regulate their Li+/Ni2+ cation ordering towards cyclability improvements
Qiyu Zhang,Yuefeng Su,Lai Chen,Yun Lu,Liying Bao,Tao He,Jing Wang,Renjie Chen,Jing Tan,Feng Wu +9 more
TL;DR: LiNi0.8Co0.1Mn 0.1O2 with an additional pre-oxidization process using nitrates was synthesized in this article, and the electrochemical tests showed that after 100 cycles, the capacity retention was improved from 79.04% to 90.73%.
Journal ArticleDOI
A novel strategy to significantly enhance the initial voltage and suppress voltage fading of a Li- and Mn-rich layered oxide cathode material for lithium-ion batteries
Shiming Zhang,Jian Chen,Tian Tang,Yinzhu Jiang,Gairong Chen,Qinong Shao,Chenhui Yan,Tiejun Zhu,Mingxia Gao,Yongfeng Liu,Hongge Pan +10 more
TL;DR: In this article, a Li[Li0.2Ni0.13Co0.54]O2-xLiNiO2 composite cathode with a Ni-rich bulk phase and in situ precipitated spinel-like phase on the surface has been built up to significantly enhance the initial voltage and suppress the voltage fading during cycling and consequently effectively increase the energy density.
Journal ArticleDOI
High-Performance Heterostructured Cathodes for Lithium-Ion Batteries with a Ni-Rich Layered Oxide Core and a Li-Rich Layered Oxide Shell.
TL;DR: A unique chemical treatment for the activation of the Li2MnO3 phase of the shell, a high capacity is realized with the Li‐rich shell material and Aberration‐corrected scanning transmission electron microscopy provides direct evidence for the formation of surface Li‐ rich shell layer.
Journal ArticleDOI
High-Thermal- and Air-Stability Cathode Material with Concentration-Gradient Buffer for Li-Ion Batteries.
Ji-Lei Shi,Ran Qi,Ran Qi,Xu-Dong Zhang,Peng-Fei Wang,Wei-Gui Fu,Ya-Xia Yin,Jian Xu,Li-Jun Wan,Yu-Guo Guo +9 more
TL;DR: This cathode material with the merit of NCM concentration-gradient protective buffer and the inner NCA core shows high capacity retention and much improved thermal and air stability compared with bare NCA.
References
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Journal ArticleDOI
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides
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
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TL;DR: The Review will consider some of the current scientific issues underpinning lithium batteries and electric double-layer capacitors.
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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.
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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.