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
A short process for the efficient utilization of transition-metal chlorides in lithium-ion batteries: A case of Ni 0.8 Co 0.1 Mn 0.1 O 1.1 and LiNi 0.8 Co 0.1 Mn 0.1 O 2
TL;DR: A short process for the efficient utilization of transition-metal chlorides in lithium-ion batteries (LIBs) is proposed in this article, where a uniformly dispersed tri-component nanocomposite of Ni 0.8 Co 0.1 O 1.1 microspheres with a porous structure has been prepared from the solution of transition metal chlorides via spray pyrolysis.
Journal ArticleDOI
Mitigating Voltage Decay of Li-Rich Cathode Material via Increasing Ni Content for Lithium-Ion Batteries
Ji-Lei Shi,Jie-Nan Zhang,Min He,Xu-Dong Zhang,Ya-Xia Yin,Hong Li,Yu-Guo Guo,Lin Gu,Li-Jun Wan +8 more
TL;DR: It is demonstrated that nickel ions act as stabilizing ions to inhibit the Jahn-Teller effect of active Mn(3+) ions, improving d-p hybridization and supporting the layered structure as a pillar, thus avoiding the formation of spinel-like structures and consequently mitigating the voltage decay.
Journal ArticleDOI
Surface regulation enables high stability of single-crystal lithium-ion cathodes at high voltage.
Fang Zhang,Shuaifeng Lou,Shuang Li,Zhenjiang Yu,Qingsong Liu,Alvin Dai,Chuntian Cao,Michael F. Toney,Mingyuan Ge,Xianghui Xiao,Wah-Keat Lee,Yudong Yao,Junjing Deng,Tongchao Liu,Yiping Tang,Geping Yin,Jun Lu,Dong Su,Jiajun Wang +18 more
TL;DR: This work investigates the correlation of the surface structure, internal strain, and capacity deterioration by using operando X-ray spectroscopy imaging and nano-tomography and discovers that surface chemistry can significantly enhance the cyclic performance.
Journal ArticleDOI
Surface and Subsurface Reactions of Lithium Transition Metal Oxide Cathode Materials: An Overview of the Fundamental Origins and Remedying Approaches
Biwei Xiao,Xueliang Sun +1 more
TL;DR: A review of surface modification methods for rechargeable lithium-ion batteries can be found in this paper, where a rational surface modification method for use in cathode materials is proposed for the purpose of addressing impeding issues.
Journal ArticleDOI
A highly stabilized nickel-rich cathode material by nanoscale epitaxy control for high-energy lithium-ion batteries
Junhyeok Kim,Hyunsoo Ma,Hyungyeon Cha,Hyomyung Lee,Jaekyung Sung,Min-Ho Seo,Pilgun Oh,Minjoon Park,Jaephil Cho +8 more
TL;DR: In this article, the degradation of battery cycle life is caused by the release of divalent nickel ions from the LiNi0.8Co0.1Mn 0.1O2 cathode and formation of nickel metal particles on the graphite anode surface, deteriorating the anode SEI layer and its structural integrity.
References
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Review of selected electrode–solution interactions which determine the performance of Li and Li ion batteries
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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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