Covariance controlled state-of-charge estimator of LiFePO4 cells using a simplified hysteresis model

Chun, Chang; Cho, B.H.; Kim, Jong-Hoon

doi:10.1016/j.electacta.2018.01.178

Cited by 9 publications

(4 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years, Li(Ni x Mn y Co z )O 2 (with x + y + z = 1) (NCM) − and LiFePO 4 − are two main types of cathode materials that have been studied intensively in the energy storage field. The NCM cathode generally suffers from structural instability and detrimental side reaction due to the severe transition-metal dissolution, which results in a quick capacity fading and insufficient rate capability. , With regard to the LiFePO 4 cathode, the shortcoming is that its discharge plateau (3.4 V vs Li + /Li) is relatively low. ,, Therefore, a large number of single batteries required in a series battery pack would inevitably increases the internal resistance and weight of the battery pack, which limits the applications of LiFePO 4 in high energy storage system. Considering the aforementioned inadequacies of the NCM and LiFePO 4 cathode materials, the polyanion compound LiVPO 4 F has emerged to be an alternative for LIBs. − It not only has a good thermal and structural stability but also exhibits a high discharge plateau (4.23 V vs Li + /Li) and theoretical energy density (660 Wh kg –1 ). ,,, The triclinic LiVPO 4 F is composed by a three-dimensional framework that comprises a PO 4 tetrahedra and VO 4 F 2 octahedra; − therefore, it possesses a congenital advantage of internal lithium-ion diffusion.…”

Section: Introductionmentioning

confidence: 99%

“…13,22 With regard to the LiFePO 4 cathode, the shortcoming is that its discharge plateau (3.4 V vs Li + /Li) is relatively low. 20,23,24 Therefore, a large number of single batteries required in a series battery pack would inevitably increases the internal resistance and weight of the battery pack, which limits the applications of LiFePO 4 in high energy storage system. Considering the aforementioned inadequacies of the NCM and LiFePO 4 cathode materials, the polyanion compound LiVPO 4 F has emerged to be an alternative for LIBs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Double Donors Tuning Conductivity of LiVPO₄F for Advanced Lithium-Ion Batteries

Xue

2019

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

To fulfill the increasing demand of lithium-ion batteries for realizing high energy density and great cycling stability under high rate, the cathode material capable of efficient electron and Li+-ion transportation is necessarily demanded. Herein, we propose a double-donor doping strategy by taking the carbon-coated LiVPO4F as a model system. The Hall effect confirms that either or both Mg2+ substitution of Li+ and Nb5+ substitution of V3+ cause the carrier-type transformation from p-type to n-type. The great enhancements of electronic conductivity and ionic conductivity are realized in Li0.995Mg0.005V0.98Nb0.02PO4F, which also exhibits a markedly improved Li+ diffusion coefficient and reduced electrochemical polarization. The carbon-coating layer can effectively prevent the decomposition reaction of electrolyte, allowing for good structural stability of Li0.995Mg0.005V0.98Nb0.02PO4F when suffering fast Li+ insertion/extraction. As expected, the Li0.995Mg0.005V0.98Nb0.02PO4F cathode exhibited superior electrochemical properties with an initial discharge capacity of 124.5 mA h g–1 and capacity retention of 97.3% after 600 cycles at 1.6C. Even under a high rate of 8C, the discharge energy density was 392 Wh kg–1 at the beginning and showed a retention rate of 84.4% after 2000 cycles.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Double Donors Tuning Conductivity of LiVPO₄F for Advanced Lithium-Ion Batteries

Xue

2019

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…The state of charge is a critical indicator that reflects the available state of the remaining charge. Monitoring SOC is imperative to regulate the extent of charging and discharging, preventing both overcharging and overdischarging [7][8][9][10]. SOC is a non-directly measured physical quantity that can only be obtained through indirect methods.…”

Section: Introductionmentioning

confidence: 99%

Estimation of SOC in Lithium-Iron-Phosphate Batteries Using an Adaptive Sliding Mode Observer with Simplified Hysteresis Model during Electric Vehicle Duty Cycles

Chang,

Li,

Sun

et al. 2024

Batteries

View full text Add to dashboard Cite

This paper develops a model for lithium-ion batteries under dynamic stress testing (DST) and federal urban driving schedule (FUDS) conditions that incorporates associated hysteresis characteristics of 18650-format lithium iron-phosphate batteries. Additionally, it introduces the adaptive sliding mode observer algorithm (ASMO) to achieve robust and swiftly accurate estimation of the state of charge (SOC) of lithium-iron-phosphate batteries during electric vehicle duty cycles. The established simplified hysteresis model in this paper significantly enhances the fitting accuracy during charging and discharging processes, compensating for voltage deviations induced by hysteresis characteristics. The SOC estimation, even in the face of model parameter changes under complex working conditions during electric vehicle duty cycles, maintains high robustness by capitalizing on the easy convergence and parameter insensitivity of ASMO. Lastly, experiments conducted under different temperatures and FUDS and DST conditions validate that the SOC estimation of lithium-iron-phosphate batteries, based on the adaptive sliding-mode observer and the simplified hysteresis model, exhibits enhanced robustness and faster convergence under complex working conditions and temperature variations during electric vehicle duty cycles.

show abstract

“…45 With careful consideration in the experiments, maximum hysteresis was observed typically near low SOC for LTO, LFP and NMC. 46 After the OCV function of LMR-NMC materials was investigated, it is reported that increasing hysteresis with temperature was not the result of impedance or polarization. 47 The piecewise voltage curve is obtained by translation and linearization of OCV curve and translation-based-major loop was introduced to reflect the transition between translated charging and discharging voltages.…”

mentioning

confidence: 99%

Modeling of Dynamic Hysteresis Characters for the Lithium-Ion Battery

et al. 2020

J. Electrochem. Soc.

View full text Add to dashboard Cite

The strategies of battery management system (BMS) rely heavily on sets of models to represent the lithium-ion batteries. However, the hysteresis voltage response of the batteries, which is mainly caused by the polarization of the electrodes, will inevitably have influence on the accuracy and real-time performance of the model’s SOC-OCV curve, more or less. In this work, a dynamic Prandtl–Ishlinskii model is established to present a certain magnitude of hysteresis regarding not only the major OCV boundaries but also the different minor loops of partial charge and discharge. The relationship between SOC and hysteresis behavior of the battery’s voltage is investigated through a self-designed pulsed-current test over a range of operating temperatures. Finally, the dynamic performance of the model is verified by the results obtained from the electric vehicle under dynamic driving cycle. The proposed model can significantly improve the accuracy of the model based SOC estimator as well as the robustness in terms of initial voltage error and current error.

show abstract

Covariance controlled state-of-charge estimator of LiFePO4 cells using a simplified hysteresis model

Cited by 9 publications

References 43 publications

Double Donors Tuning Conductivity of LiVPO₄F for Advanced Lithium-Ion Batteries

Double Donors Tuning Conductivity of LiVPO₄F for Advanced Lithium-Ion Batteries

Estimation of SOC in Lithium-Iron-Phosphate Batteries Using an Adaptive Sliding Mode Observer with Simplified Hysteresis Model during Electric Vehicle Duty Cycles

Modeling of Dynamic Hysteresis Characters for the Lithium-Ion Battery

Contact Info

Product

Resources

About

Covariance controlled state-of-charge estimator of LiFePO4 cells using a simplified hysteresis model

Cited by 9 publications

References 43 publications

Double Donors Tuning Conductivity of LiVPO4F for Advanced Lithium-Ion Batteries

Double Donors Tuning Conductivity of LiVPO4F for Advanced Lithium-Ion Batteries

Estimation of SOC in Lithium-Iron-Phosphate Batteries Using an Adaptive Sliding Mode Observer with Simplified Hysteresis Model during Electric Vehicle Duty Cycles

Modeling of Dynamic Hysteresis Characters for the Lithium-Ion Battery

Contact Info

Product

Resources

About

Double Donors Tuning Conductivity of LiVPO₄F for Advanced Lithium-Ion Batteries

Double Donors Tuning Conductivity of LiVPO₄F for Advanced Lithium-Ion Batteries