scholarly journals Resolving atomic-scale phase transformation and oxygen loss mechanism in ultrahigh-nickel layered cathodes for cobalt-free lithium-ion batteries

Matter ◽  
2021 ◽  
Author(s):  
Chunyang Wang ◽  
Lili Han ◽  
Rui Zhang ◽  
Hao Cheng ◽  
Linqin Mu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Atomic Scale ◽  
Loss Mechanism ◽  
Oxygen Loss ◽  
Layered Cathodes

scholarly journals Atomic-Scale Mechanisms of Enhanced Electrochemical Properties of Mo-Doped Co-Free Layered Oxide Cathodes for Lithium-Ion Batteries

2019 ◽  
Vol 4 (10) ◽  
pp. 2540-2546 ◽  
Author(s):  
Linze Li ◽  
Jianguo Yu ◽  
Devendrasinh Darbar ◽  
Ethan C. Self ◽  
Donghai Wang ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Atomic Scale ◽  
Layered Oxide ◽  
Oxide Cathodes ◽  
Layered Oxide Cathodes

Tailoring grain boundary structures and chemistry of Ni-rich layered cathodes for enhanced cycle stability of lithium-ion batteries

Nature Energy ◽  
2018 ◽  
Vol 3 (7) ◽  
pp. 600-605 ◽  
Author(s):  
Pengfei Yan ◽  
Jianming Zheng ◽  
Jian Liu ◽  
Biqiong Wang ◽  
Xiaopeng Cheng ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Cycle Stability ◽  
Layered Cathodes

Advances in Sustain Stable Voltage of Cr-Doped Li-Rich Layered Cathodes for Lithium Ion Batteries

2014 ◽  
Vol 161 (10) ◽  
pp. A1723-A1730 ◽  
Author(s):  
Bohang Song ◽  
Cuifeng Zhou ◽  
Hailong Wang ◽  
Hongwei Liu ◽  
Zongwen Liu ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Stable Voltage ◽  
Layered Cathodes

Crystal Chemistry of Chemically Delithiated Layered Oxide Cathodes of Lithium Ion Batteries

2002 ◽  
Vol 756 ◽  
Author(s):  
A. Manthiram ◽  
S. Venkatraman
Keyword(s):  
Chemical Analysis ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Second Phase ◽  
Redox Titration ◽  
Oxygen Loss ◽  
Oxide Cathodes ◽  
Layered Oxide Cathodes ◽  
Acetonitrile Medium ◽  
Phase Chemical

ABSTRACTThe structural and chemical stabilities of layered Li1-xCoO2-δ, Li1-xNi0.85Co0.15O2-δ and Li1-xNi0.5Mn0.5O2-δ (0 ≤ (1-x) ≤ 1) cathodes have been investigated by chemically extracting lithium from the corresponding LiMO2 with the oxidizer NO2BF4 in acetonitrile medium. While Li1-xCoO2-δ and Li1-xNi0.85Co0.15O2-δ begin to form a P3-type and a new O3-type (designated as O3') phases, respectively, for (1-x) < 0.5 and (1-x) < 0.3, Li1-xNi0.5Mn0.5O2-δ maintains the initial O3-type structure without forming any second phase. Chemical analysis with a redox titration indicates that the Li1-xCoO2-δ, Li1-xNi0.85Co0.15O2-δ, and Li1-xNi0.5Mn0.5O2-δ systems begin to lose oxygen from the lattice, respectively, for (1-x) < 0.5, < 0.3 and < 0.4, which is accompanied by an onset of a decrease in the c parameter. The oxygen loss signals chemical instability and the trend in instability correlates with the charging voltage profiles of the cathodes.

scholarly journals Time-resolved in situ neutron diffraction studies of Li-ion battery materials

2014 ◽  
Vol 70 (a1) ◽  
pp. C353-C353 ◽  
Author(s):  
Neeraj Sharma
Keyword(s):  
Crystal Structure ◽  
Neutron Diffraction ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Electrochemical Process ◽  
Atomic Scale ◽  
Structure Evolution ◽  
Time Resolved ◽  
In Situ Neutron Diffraction

Lithium-ion batteries are ubiquitous in society, used in everything from children's toys to mobile electronic devices, providing portable power solutions. There is a continuous drive for the improvement of these batteries to meet the demands of higher power devices and uses. A large proportion of the function of lithium-ion batteries arises from the electrodes, and these are in turn mediated by the atomic-scale perturbations or changes in the crystal structure during an electrochemical process (e.g. battery use). Therefore, a method to both understand battery function and propose ideas to improve their performance is to probe the electrode crystal structure evolution in situ while an electrochemical process is occurring inside a battery. Our work has utilized the benefits of in situ neutron diffraction (e.g. sensitivity towards lithium) to literally track the time-resolved evolution of lithium in electrode materials used in lithium-ion batteries (see Figure 1). With this knowledge we have been able to directly relate electrochemical properties such as capacity and differences in charge/discharge behaviour of a battery to the content and distribution of lithium in the electrode crystal structure. This talk will showcase some of our in situ investigations of materials in lithium-ion batteries, such as LiCoO2, LiFePO4, Li1+yMn2O4, LiNi0.5Mn1.5O4 and Li4Ti5O12/TiO2 electrodes. In addition, selected examples of our work using time-resolved in situ X-ray diffraction to probe other batteries types, such as primary lithium and secondary (rechargeable) sodium-ion batteries will be presented. Using time-resolved diffraction data, a comprehensive atomic-scale picture of battery functionality can be modelled and permutations can be made to the electrodes and electrochemical conditions to optimize battery performance. Therefore, crystallography and electrochemistry can mesh together to solve our energy needs.

Stabilizing the cationic/anionic redox chemistry of Li-rich layered cathodes by tuning the upper cut-off voltage for high energy-density lithium-ion batteries

2020 ◽  
Vol 8 (28) ◽  
pp. 14214-14222
Author(s):  
Peiyu Hou ◽  
Feng Li ◽  
Haiyan Zhang ◽  
Haitao Huang
Keyword(s):  
Energy Density ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Redox Chemistry ◽  
High Energy ◽  
High Energy Density ◽  
Layered Oxides ◽  
Layered Cathodes

The reversibility of cationic/anionic redox chemistries is significantly improved for the Li-rich layered oxides at a low upper cut-off voltage of 4.5 V (vs. Li/Li+).

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