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
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Journal ArticleDOI
Multifunctional Integration of Double-Shell Hybrid Nanostructure for Alleviating Surface Degradation of LiNi0.8Co0.1Mn0.1O2 Cathode for Advanced Lithium-Ion Batteries at High Cutoff Voltage.
Qiwen Ran,Hongyuan Zhao,Hongyuan Zhao,Hu Youzuo,Hao Shuai,Qianqian Shen,Jintao Liu,Hao Li,Xiao Yu,Lei Li,Liping Wang,Xingquan Liu +11 more
TL;DR: A double-shell hybrid nanostructure consisting of a Li2SiO3 coating layer and a cation-mixed layer (Fm3(-)m phase) to improve its electrochemical performance alleviates side reactions, structural degradation, and internal cracking, effectively enhancing surface structural stability.
Journal ArticleDOI
Shape-controlled synthesis of hierarchically layered lithium transition-metal oxide cathode materials by shear exfoliation in continuous stirred-tank reactors
Weibo Hua,Weibo Hua,Zhenguo Wu,Mingzhe Chen,Michael Knapp,Xiaodong Guo,Sylvio Indris,Joachim R. Binder,Natalia Bramnik,Benhe Zhong,Haipeng Guo,Shulei Chou,Yong-Mook Kang,Helmut Ehrenberg +13 more
TL;DR: Li et al. as discussed by the authors used a high-shear mixer to continuously prepare flower-like hydroxide precursors via a co-precipitation method in a continuous stirred-tank reactor (CSTR).
Air/water/temperature-stable cathode for all-climate sodium-ion batteries
Zhen-Yi Gu,Jin-Zhi Guo,Zhonghui Sun,Xin-Xin Zhao,Xiao-Tong Wang,Hao-Jie Liang,Xing-Long Wu,Yichun Liu +7 more
TL;DR: In this article, a stable cathode material that shows no obvious capacity attenuation in various storage conditions is reported. But, the cathode is composed of regular and homogeneous Na3V2(PO4)2O2F0.99Cl0.01 (NVPFCl) microcubes, with electrochemical properties, including high specific capacity (128.2 mA h g-1 at 0.1 C), excellent rate capability (79.8 mAh g −1 at 20 C), long-term cycle life, and all-climate performance
Journal ArticleDOI
Study of Immersion of LiNi0.5Mn0.3Co0.2O2 Material in Water for Aqueous Processing of Positive Electrode for Li-Ion Batteries
Marie Bichon,Dane Sotta,Nicolas Dupré,Eric De Vito,Adrien Boulineau,Willy Porcher,Bernard Lestriez +6 more
TL;DR: The understanding of the phenomena occurring during immersion of LiNi0.5Mn0.3Co0.2O2 (NMC) in water is helpful to devise new strategies toward the implementation of aqueous processing of this high-capacity cathode material.
Journal ArticleDOI
Recent progress on nanostructured 4 V cathode materials for Li-ion batteries for mobile electronics
TL;DR: In this paper, the progress on nanostructured 4-V cathode materials of Li-ion batteries for mobile electronics is reviewed, covering LiCoO 2, LiNi x Co y Mn 1− x − y O 2,LiMn 2 O 4,LiNi 0.5 Mn 1.5 O 4 and Li-rich layered oxide materials.
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
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Journal ArticleDOI
Positive Electrode Materials for Li-Ion and Li-Batteries†
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Journal ArticleDOI
High-energy cathode material for long-life and safe lithium batteries
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