Electrochemical performance degeneration mechanism of LiCoO2 with high state of charge during long-term charge/discharge cycling

RSC Advances ◽  
2015 ◽  
Vol 5 (99) ◽  
pp. 81235-81242 ◽  
Author(s):  
Shuaifeng Lou ◽  
Bin Shen ◽  
Pengjian Zuo ◽  
Geping Yin ◽  
Lijie Yang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
State Of Charge ◽  
Bulk Phase ◽  
High State ◽  
Capacity Degradation ◽  
Main Factors ◽  
Charge Discharge

The SEI evolution on the surface and Li/Co hybrid alignment in bulk phase are main factors for capacity degradation of LiCoO2 electrodes with high SOC in long-term cycling.

scholarly journals Adaptive State-of-Charge Estimation for Lithium-Ion Batteries by Considering Capacity Degradation

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 122
Author(s):  
Peipei Xu ◽  
Junqiu Li ◽  
Chao Sun ◽  
Guodong Yang ◽  
Fengchun Sun
Keyword(s):  
Equivalent Circuit Model ◽  
Lithium Ion ◽  
Maximum Error ◽  
State Of Charge ◽  
Recursive Least Squares ◽  
Accurate Estimation ◽  
Model Parameters ◽  
Soc Estimation ◽  
Capacity Degradation ◽  
Battery Capacity

The accurate estimation of a lithium-ion battery’s state of charge (SOC) plays an important role in the operational safety and driving mileage improvement of electrical vehicles (EVs). The Adaptive Extended Kalman filter (AEKF) estimator is commonly used to estimate SOC; however, this method relies on the precise estimation of the battery’s model parameters and capacity. Furthermore, the actual capacity and battery parameters change in real time with the aging of the batteries. Therefore, to eliminate the influence of above-mentioned factors on SOC estimation, the main contributions of this paper are as follows: (1) the equivalent circuit model (ECM) is presented, and the parameter identification of ECM is performed by using the forgetting-factor recursive-least-squares (FFRLS) method; (2) the sensitivity of battery SOC estimation to capacity degradation is analyzed to prove the importance of considering capacity degradation in SOC estimation; and (3) the capacity degradation model is proposed to perform the battery capacity prediction online. Furthermore, an online adaptive SOC estimator based on capacity degradation is proposed to improve the robustness of the AEKF algorithm. Experimental results show that the maximum error of SOC estimation is less than 1.3%.

scholarly journals Fabrication of Hierarchical NiMoO4/NiMoO4 Nanoflowers on Highly Conductive Flexible Nickel Foam Substrate as a Capacitive Electrode Material for Supercapacitors with Enhanced Electrochemical Performance

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1143 ◽  
Author(s):  
Anil Yedluri ◽  
Tarugu Anitha ◽  
Hee-Je Kim
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Material ◽  
High Performance ◽  
Nickel Foam ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Charge Discharge

Hierarchical NiMoO4/NiMoO4 nanoflowers were fabricated on highly conductive flexible nickel foam (NF) substrates using a facile hydrothermal method to achieve rapid charge-discharge ability, high energy density, long cycling lifespan, and higher flexibility for high-performance supercapacitor electrode materials. The synthesized composite electrode material, NF/NiMoO4/NiMoO4 with a nanoball-like NF/NiMoO4 structure on a NiMoO4 surface over a NF substrate, formed a three-dimensional interconnected porous network for high-performance electrodes. The novel NF/NiMoO4/NiMoO4 nanoflowers not only enhanced the large surface area and increased the electrochemical activity, but also provided an enhanced rapid ion diffusion path and reduced the charge transfer resistance of the entire electrode effectively. The NF/NiMoO4/NiMoO4 composite exhibited significantly improved supercapacitor performance in terms of a sustained cycling life, high specific capacitance, rapid charge-discharge capability, high energy density, and good rate capability. Electrochemical analysis of the NF/NiMoO4/NiMoO4 nanoflowers fabricated on the NF substrate revealed ultra-high electrochemical performance with a high specific capacitance of 2121 F g−1 at 12 mA g−1 in a 3 M KOH electrolyte and 98.7% capacitance retention after 3000 cycles at 14 mA g−1. This performance was superior to the NF/NiMoO4 nanoball electrode (1672 F g−1 at 12 mA g−1 and capacitance retention 93.4% cycles). Most importantly, the SC (NF/NiMoO4/NiMoO4) device displayed a maximum energy density of 47.13 W h kg−1, which was significantly higher than that of NF/NiMoO4 (37.1 W h kg−1). Overall, the NF/NiMoO4/NiMoO4 composite is a suitable material for supercapacitor applications.

DC-AC hybrid rapid heating method for lithium-ion batteries at high state of charge operated from low temperatures

Energy ◽  
2022 ◽  
Vol 238 ◽  
pp. 121809
Author(s):  
Shanshan Guo ◽  
Ruixin Yang ◽  
Weixiang Shen ◽  
Yongsheng Liu ◽  
Shenggang Guo
Keyword(s):  
Lithium Ion Batteries ◽  
Low Temperatures ◽  
Rapid Heating ◽  
Lithium Ion ◽  
State Of Charge ◽  
High State ◽  
Heating Method

Li0.95Na0.05Ti2(PO4)3/C with Good Performance as Anode Material for Aqueous Rechargeable Lithium Batteries

2014 ◽  
Vol 989-994 ◽  
pp. 316-319 ◽  
Author(s):  
Jing Zhu ◽  
Yong Guang Liu ◽  
Qing Qing Tian ◽  
Ling Wang ◽  
Ji Lin Cao
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Performance ◽  
Anode Material ◽  
Lithium Batteries ◽  
Sol Gel ◽  
Nasicon Structure ◽  
Galvanostatic Charge ◽  
Rechargeable Lithium Batteries ◽  
Structure And Morphology ◽  
Charge Discharge

Li0.95Na0.05Ti2(PO4)3/C nanocomposite was prepared by sol-gel method.The structure and morphology of the samples were characterized by XRD, SEM which showed the particles had typical NASICON structure and diameter range from 400~500nm. The electrochemical performance were tested by cyclic voltammetry and galvanostatic charge–discharge. Results show Li0.95Na0.05Ti2(PO4)3/C nanocomposite exhibitsmuch better electrochemical performance than bare Li0.95Na0.05Ti2(PO4)3.

Performance and Long-Term Charge/Discharge Properties of a Capacitor Electrode of Carbon Gel in an Organic Electrolyte

2017 ◽  
Vol 43 (1) ◽  
pp. 45-49 ◽  
Author(s):  
Hikaru Tsuchida ◽  
Zairan Cheng ◽  
Kiyoharu Nakagawa ◽  
Hirokazu Oda
Keyword(s):  
Organic Electrolyte ◽  
Carbon Gel ◽  
Charge Discharge

scholarly journals Study of professional and emotional burnout in foreign psychological-pedagogical theory and practice

2020 ◽  
Author(s):  
Behun-Trachuk Larysa
Keyword(s):  
Human Rights ◽  
Social Activity ◽  
Theory And Practice ◽  
Empirical Methods ◽  
Professional Stress ◽  
Methodological Problems ◽  
Main Factors ◽  
Pedagogical Theory ◽  
Emotional Burnout

One of the acute problems in modern psychological and pedagogical theory and practice is the problem of emotional burnout of pedagogical workers In the process of studying emotional burnout, we first of all encounter with such general methodological problems, such as: the need to take into account all the main factors that are important for the emergence and formation of emotional burnout in a specialist, with the fact of variability of the main symptoms of emotional burnout at different stages of its formation (changes in thinking, behavior, feelings and health); taking into account probable moments in the development and formation of emotional burnout, etc. In our opinion, the following approaches can be solved by solving common methodological problems: interdisciplinary, systemic, empirical, personal-social-activity, situational. The article uses a complex of theoretical and empirical methods of analysis, systemization and generalization. Scientific understanding of foreign experience in studying the phenomenon of burnout, allowed to determine the degree of negativity of long-term professional stress, emotionally charged conditions of concert and stage activities and a large number of unforeseen situations of artistic and pedagogical interaction as a determinant of psychophysical burnout, emotional and intellectual I am a specialist. Thus, the approaches analysed in this article to the study of “emotional burnout” show that burnout manifests itself in various spheres of personality (cognitive, motivational, human rights to work), and there is a connection between burnout and exacerbation in all these areas, it seems to us important. Further research requires the development of technologies to overcome the syndrome identified by Ukrainian scientists.

scholarly journals Results of Analysis of Aging Related Events at Ukrainian NPPs

2020 ◽  
pp. 44-51
Author(s):  
O-i Shugailo ◽  
O. Ligotskyy ◽  
O. Pecherytsia ◽  
O. Kulman ◽  
R. Moskalyshyn ◽  
...  
Keyword(s):  
Nuclear Energy ◽  
Maximum Efficiency ◽  
Operational Experience ◽  
Aging Effects ◽  
Term Operation ◽  
Operation Period ◽  
Periodic Safety ◽  
Nuclear Installation ◽  
Main Factors

The design lifetime (30 years) of Ukrainian NPPs has already been expired or will be expired soon. One of the priority areas for the development of nuclear energy is long-term operation (LTO) based on the results of periodic safety review. At present, eleven Ukrainian NPP units are operated under LTO conditions, which in turn causes certain features of operation related to wear, fatigue and general aging of components and structures. An issue of aging management is considered one of the main factors to ensure the safety of a nuclear installation, both in the design lifetime and in the long-term operation. The primary purpose of aging management is to ensure the safety and maximum efficiency of operation through the implementation of technically and economically feasible measures aimed at timely detection and keeping of degradation of NPP components caused by aging within the limits. One way to determine the efficiency of implemented measures and aging management programs is to analyze operational experience and, in particular, analyze the number of NPP operational occurrences during the design and long-term operation period and that are directly related to the aging effects. This paper presents the results of the analysis of the events at Ukrainian NPPs caused by aging processes, compares the results of national and international experience.

A high performance ceria-based solid oxide fuel cell operating on underground coal gasification gas

RSC Advances ◽  
2015 ◽  
Vol 5 (106) ◽  
pp. 87477-87483 ◽  
Author(s):  
Jie Xiong ◽  
Chengran Jiao ◽  
Minfang Han ◽  
Wentao Yi ◽  
Jie Ma ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Electrochemical Performance ◽  
Solid Oxide Fuel Cell ◽  
High Performance ◽  
Coal Gasification ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Underground Coal Gasification ◽  
Long Term Stability

A NiO-GDC‖GDC‖Ba0.9Co0.7Fe0.2Nb0.1O3−δ cell fed with UCG gas demonstrated exceptional electrochemical performance and desirable long term stability.

FACTORS DETERMINING THE CHANGE OF HELIUM CONCENTRATION IN UNDERGROUND WATERS OF UZBEKISTAN AND THE ACCORDING TERRITORIES

2019 ◽  
Vol 2019 (4) ◽  
pp. 148-153
Author(s):  
M Zakirov ◽  
◽  
I Agzamova ◽  
N Mavlyanova
Keyword(s):  
Seismic Events ◽  
Factors Affecting ◽  
Helium Concentration ◽  
Underground Waters ◽  
Quantitative Content ◽  
Main Factors

The article presents the results of the analysis of long-term regime observations of change in the concentrations of groundwater of Uzbekistan and adjacent territories. Based on these observations, the main factors affecting the changes of the quantitative content of helium. The results of the evaluation of the characteristics of the changes and distribution of helium in groundwater. The change of helium concentration in groundwater significantly influence the deformation and hydro-geodynamic and tectonic conditions. Described and quantified four factors with different concentrations of helium. They allow to correctly assess the variation of helium associated with seismic events.

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