scholarly journals Reaction inhomogeneity coupling with metal rearrangement triggers electrochemical degradation in lithium-rich layered cathode

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Liguang Wang ◽  
Tongchao Liu ◽  
Alvin Dai ◽  
Vincent De Andrade ◽  
Yang Ren ◽  
...  
Keyword(s):  
Imaging Techniques ◽  
Material Design ◽  
High Energy ◽  
Structural Instability ◽  
High Energy Density ◽  
Electrochemical Degradation ◽  
Layered Oxides ◽  
Capacity Loss ◽  
Voltage Decay ◽  
Capacity Degradation

AbstractHigh-energy density lithium-rich layered oxides are among the most promising candidates for next-generation energy storage. Unfortunately, these materials suffer from severe electrochemical degradation that includes capacity loss and voltage decay during long-term cycling. Present research efforts are primarily focused on understanding voltage decay phenomena while origins for capacity degradation have been largely ignored. Here, we thoroughly investigate causes for electrochemical performance decline with an emphasis on capacity loss in the lithium-rich layered oxides, as well as reaction pathways and kinetics. Advanced synchrotron-based X-ray two-dimensional and three-dimensional imaging techniques are combined with spectroscopic and scattering techniques to spatially visualize the reactivity at multiple length-scales on lithium- and manganese-rich layered oxides. These methods provide direct evidence for inhomogeneous manganese reactivity and ionic nickel rearrangement. Coupling deactivated manganese with nickel migration provides sluggish reaction kinetics and induces serious structural instability in the material. Our findings provide new insights and further understanding of electrochemical degradation, which serve to facilitate cathode material design improvements.

scholarly journals Material design of high-capacity Li-rich layered-oxide electrodes: Li2MnO3 and beyond

2017 ◽  
Vol 10 (10) ◽  
pp. 2201-2211 ◽  
Author(s):  
Soo Kim ◽  
Muratahan Aykol ◽  
Vinay I. Hegde ◽  
Zhi Lu ◽  
Scott Kirklin ◽  
...  
Keyword(s):  
Energy Density ◽  
Function Theory ◽  
High Capacity ◽  
Lithium Ion ◽  
Material Design ◽  
High Energy ◽  
Density Function Theory ◽  
High Energy Density ◽  
Layered Oxides ◽  
Oxide Electrodes

Material design of new Li-rich Li2(MI,MII)O3 layered oxides for high-energy-density lithium-ion batteries via multi-faceted high-throughput density function theory calculations.

Effects of doping high-valence transition metal (V, Nb and Zr) ions on the structure and electrochemical performance of LIB cathode material LiNi0.8Co0.1Mn0.1O2

2021 ◽  
Author(s):  
Yan-Hui Chen ◽  
Jing Zhang ◽  
Li Yi ◽  
Yongfan Zhang ◽  
Shuping Huang ◽  
...  
Keyword(s):  
Energy Density ◽  
Transition Metal ◽  
Electrochemical Performance ◽  
Cathode Material ◽  
High Energy ◽  
High Energy Density ◽  
Layered Oxides ◽  
Valence Transition ◽  
Capacity Degradation ◽  
Potential Decay

Ni-rich layered oxides, like LiNi0.8Co0.1Mn0.1O2 (NCM811), have been widely investigated as cathodes for high energy density. However, gradual structural transformation during cycling can lead to capacity degradation and potential decay...

A High Rate, High Capacity and Long Life (LiFePO4+AC)/Li4Ti5O12 Hybrid Battery-Supercapacitor

2014 ◽  
Vol 936 ◽  
pp. 496-502
Author(s):  
Xue Bu Hu ◽  
Zi Ji Lin ◽  
Yong Long Zhang
Keyword(s):  
Leakage Current ◽  
Electrochemical Impedance ◽  
Discharge Rate ◽  
Performance Testing ◽  
High Energy ◽  
High Energy Density ◽  
Constant Current ◽  
Electrochemical Performances ◽  
Capacity Loss ◽  
Charge Discharge

A hybrid battery-supercapacitor (LiFePO4+AC)/Li4Ti5O12 using a Li4Ti5O12 anode and a LiFePO4/activated carbon (AC) composite cathode was built. The electrochemical performances of the hybrid battery-supercapacitor (LiFePO4+AC)/Li4Ti5O12 were characterized by constant current charge-discharge, rate charge-discharge, electrochemical impedance spectra, internal resistance, leakage current, self-discharge and cycle performance testing. The results show that (LiFePO4+AC)/Li4Ti5O12 hybrid battery-supercapacitors have rapid charge-discharge performance, high energy density, long cycle life, low resistance, low leakage current and self-discharge rate, which meet the requirements of practical power supply and can be applied in auxiliary power supplies for hybrid electric vehicles. At 4C rate, the capacity loss of (LiFePO4+AC)/Li4Ti5O12 hybrid battery-supercapacitors in constant current mode is no more than 7.71% after 2000 cycles, and the capacity loss in constant current-constant voltage mode is no more than 4.51% after 1500 cycles.

scholarly journals Implications of Aqueous Processing for High Energy Density Cathode Materials: Part I. Ni-Rich Layered Oxides

2020 ◽  
Vol 167 (14) ◽  
pp. 140512 ◽  
Author(s):  
Michael Hofmann ◽  
Martina Kapuschinski ◽  
Uwe Guntow ◽  
Guinevere A. Giffin
Keyword(s):  
Energy Density ◽  
Cathode Materials ◽  
High Energy ◽  
High Energy Density ◽  
Aqueous Processing ◽  
Layered Oxides

scholarly journals Correlating the Voltage Hysteresis in Li- and Mn-Rich Layered Oxides to Reversible Structural Changes by Using X-ray and Neutron Powder Diffraction

2021 ◽  
Author(s):  
Benjamin Strehle ◽  
Tanja Zünd ◽  
Sabrina Sicolo ◽  
Aleksandr Kiessling ◽  
Volodymyr Baran ◽  
...  
Keyword(s):  
Powder Diffraction ◽  
Path Dependence ◽  
Lithium Ion ◽  
High Energy ◽  
Neutron Powder Diffraction ◽  
Lattice Parameters ◽  
High Energy Density ◽  
Ex Situ ◽  
Layered Oxides ◽  
X Ray

Abstract Li- and Mn-rich layered oxides (LMR-NCMs) are promising cathode active materials (CAMs) in future lithium-ion batteries (LIBs) due to their high energy density. However, the material undergoes a unique open circuit voltage (OCV) hysteresis between charge and discharge after activation, which compromises its roundtrip energy efficiency and affects the thermal management requirements for an LIB system. The hysteresis is believed to be caused by transition metal (TM) migration and/or by oxygen redox activities. Using in-situ X-ray powder diffraction (XPD), we monitor the lattice parameters of over-lithiated NCMs during the initial cycles and show that also the lattice parameters feature a distinct path dependence. When correlated to the OCV instead of the state of charge (SOC), this hysteresis vanishes for the unit cell volume and gives a linear correlation that is identical for different degrees of over-lithiation. We further aimed at elucidating the role of TM migration on the hysteresis phenomena by applying joint Rietveld refinements to a series of ex-situ XPD and neutron powder diffraction (NPD) samples. We critically discuss the limitations of this approach and compare the results with DFT simulations, showing that the quantification of TM migration in LMR-NCMs by diffraction is not as straightforward as often believed.

scholarly journals High-Performance Lithium-Rich Layered Oxide Material: Effects of Preparation Methods on Microstructure and Electrochemical Properties

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 334 ◽  
Author(s):  
Qiming Liu ◽  
Huali Zhu ◽  
Jun Liu ◽  
Xiongwei Liao ◽  
Zhuolin Tang ◽  
...  
Keyword(s):  
Energy Density ◽  
Lithium Ion Batteries ◽  
Layered Structure ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
Voltage Decay ◽  
Rate Capacity ◽  
Co Precipitation

Lithium-rich layered oxide is one of the most promising candidates for the next-generation cathode materials of high-energy-density lithium ion batteries because of its high discharge capacity. However, it has the disadvantages of uneven composition, voltage decay, and poor rate capacity, which are closely related to the preparation method. Here, 0.5Li2MnO3·0.5LiMn0.8Ni0.1Co0.1O2 was successfully prepared by sol–gel and oxalate co-precipitation methods. A systematic analysis of the materials shows that the 0.5Li2MnO3·0.5LiMn0.8Ni0.1Co0.1O2 prepared by the oxalic acid co-precipitation method had the most stable layered structure and the best electrochemical performance. The initial discharge specific capacity was 261.6 mAh·g−1 at 0.05 C, and the discharge specific capacity was 138 mAh·g−1 at 5 C. The voltage decay was only 210 mV, and the capacity retention was 94.2% after 100 cycles at 1 C. The suppression of voltage decay can be attributed to the high nickel content and uniform element distribution. In addition, tightly packed porous spheres help to reduce lithium ion diffusion energy and improve the stability of the layered structure, thereby improving cycle stability and rate capacity. This conclusion provides a reference for designing high-energy-density lithium-ion batteries.

Fundamental interplay between phase-transition kinetics and thermodynamics of manganese-based sodium layered oxides during cationic and anionic redox

2020 ◽  
Vol 8 (40) ◽  
pp. 21142-21150 ◽  
Author(s):  
Hyungjun Kim ◽  
Jaewoon Lee ◽  
Myungkyu Kim ◽  
Sojung Koo ◽  
Maenghyo Cho ◽  
...  
Keyword(s):  
Phase Transition ◽  
Energy Density ◽  
Phase Stability ◽  
High Energy ◽  
High Energy Density ◽  
Layered Oxides ◽  
Kinetics And Thermodynamics ◽  
Phase Transition Kinetics

Interplay between the phase-stability and -transition kinetics toward high-energy density with stable cyclability in Mn-based layered oxides for advanced SIBs.

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+).

Two-dimensional NaxSiS as a promising anode material for rechargeable sodium-based batteries: ab initio material design

2019 ◽  
Vol 21 (44) ◽  
pp. 24326-24332 ◽  
Author(s):  
Thi Dung Pham ◽  
Huu Duc Luong ◽  
Kazunori Sato ◽  
Yoji Shibutani ◽  
Van An Dinh
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Storage Systems ◽  
Material Design ◽  
High Energy ◽  
Sodium Ion ◽  
High Energy Density ◽  
Sodium Ion Batteries ◽  
Two Dimensional ◽  
Barrier Energy

The rapidly rising demand for energy storage systems presents an imperative need to develop sodium-ion batteries with high energy density, high conductivity, and low barrier energy.

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