Entropy Coefficient and Thermal Time Constant Estimation From Dynamic Thermal Cycling of a Cylindrical LiFePO4 Battery Cell

2014 ◽  
Author(s):  
Sergio Mendoza ◽  
Hosam K. Fathy
Keyword(s):  
Time Constant ◽  
Lithium Iron Phosphate ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Temperature Cycling ◽  
Thermal Time ◽  
Quasi Equilibrium ◽  
Battery Cell ◽  
Thermal Time Constant ◽  
Time Required

This paper presents a method for estimating (i) the reciprocal of the thermal time constant of a lithium-ion battery cell and (ii) the cell’s entropy coefficients for different states of charge. The method utilizes dynamic battery temperature cycling for parameter estimation. The paper demonstrates this method specifically for a cylindrical lithium iron phosphate (LiFePO4) cell. Identifying battery thermal parameters is important for accurate thermo-electrochemical modeling and model-based battery management. Entropy coefficients have been identified in previous research for various battery chemistries using calorimetric and potentiometric measurements requiring quasi-equilibrium conditions. This work, in contrast, fits the entropy coefficients and the reciprocal of the thermal time constant of a first-order thermal model to datasets collected in a noninvasive, dynamic experiment. This reduces the time required for parameter identification by a factor of 3 compared to traditional quasi-equilibrium experiments.

Graphenised Lithium Iron Phosphate and Lithium Manganese Silicate Hybrid Cathodes: Potentials for Application in Lithium‐ion Batteries

2020 ◽  
Vol 32 (12) ◽  
pp. 2982-2999
Author(s):  
Zolani Myalo ◽  
Chinwe Oluchi Ikpo ◽  
Assumpta Chinwe Nwanya ◽  
Miranda Mengwi Ndipingwi ◽  
Samantha Fiona Duoman ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Iron Phosphate ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Manganese Silicate ◽  
Lithium Manganese

scholarly journals A Novel Pyrometallurgical Recycling Process for Lithium-Ion Batteries and Its Application to the Recycling of LCO and LFP

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 149
Author(s):  
Alexandra Holzer ◽  
Stefan Windisch-Kern ◽  
Christoph Ponak ◽  
Harald Raupenstrauch
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Iron Phosphate ◽  
Process Development ◽  
Removal Rate ◽  
Continuous Process ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Recycling Process ◽  
Subsequent Step ◽  
Pre Treatment

The bottleneck of recycling chains for spent lithium-ion batteries (LIBs) is the recovery of valuable metals from the black matter that remains after dismantling and deactivation in pre‑treatment processes, which has to be treated in a subsequent step with pyrometallurgical and/or hydrometallurgical methods. In the course of this paper, investigations in a heating microscope were conducted to determine the high-temperature behavior of the cathode materials lithium cobalt oxide (LCO—chem., LiCoO2) and lithium iron phosphate (LFP—chem., LiFePO4) from LIB with carbon addition. For the purpose of continuous process development of a novel pyrometallurgical recycling process and adaptation of this to the requirements of the LIB material, two different reactor designs were examined. When treating LCO in an Al2O3 crucible, lithium could be removed at a rate of 76% via the gas stream, which is directly and purely available for further processing. In contrast, a removal rate of lithium of up to 97% was achieved in an MgO crucible. In addition, the basic capability of the concept for the treatment of LFP was investigated whereby a phosphorus removal rate of 64% with a simultaneous lithium removal rate of 68% was observed.

Modification of liquid-phase synthesis of lithium-iron phosphate, a cathode material for lithium-ion battery

2012 ◽  
Vol 85 (6) ◽  
pp. 879-882 ◽  
Author(s):  
E. N. Kudryavtsev ◽  
R. V. Sibiryakov ◽  
D. V. Agafonov ◽  
V. N. Naraev ◽  
A. V. Bobyl’
Keyword(s):  
Liquid Phase ◽  
Cathode Material ◽  
Lithium Ion Battery ◽  
Lithium Iron Phosphate ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Phase Synthesis

Iron Phosphates as Cathodes of Lithium-Ion Batteries

2006 ◽  
Vol 973 ◽  
Author(s):  
Shijun Wang ◽  
M. Stanley Whittingham
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Iron Phosphate ◽  
Low Cost ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Environmentally Benign ◽  
Iron Phosphates ◽  
Electrochemical Capacity ◽  
High Theoretical Capacity ◽  
Olivine Structure

ABSTRACTThis study focusses on optimizing the parameters of the hydrothermal synthesis to produce iron phosphates for lithium ion batteries, with an emphasis on pure LiFePO4 with the olivine structure and compounds containing a higher iron:phosphate ratio. Lithium iron phosphate (LiFePO4) is a promising cathode candidate for lithium ion batteries due to its high theoretical capacity, environmentally benign and the low cost of starting materials. Well crystallized LiFePO4 can be successfully synthesized at temperatures above 150 °C. The addition of a reducing agent, such as hydrazine, is essential to minimize the oxidation of ferrous (Fe2+) to ferric (Fe3+) in the final compound. The morphology of LiFePO4 is highly dependent on the pH of the initial solution. This study also investigated the lipscombite iron phosphates of formula Fe1.33PO4OH. This compound has a log-like structure formed by Fe-O octahedral chains. The chains are partially occupied by the Fe3+ sites, and these iron atoms and some of the vacancies can be substituted by other cations. Most of the protons can be ion-exchanged for lithium, and the electrochemical capacity is much increased.

Synthesis and Characterization of Mg and Ti Ions Co-Doped Lithium Iron Phosphate and Its Lithium-Ion Batteries

2012 ◽  
Vol 28 (09) ◽  
pp. 2084-2090 ◽  
Author(s):  
WANG Zhen-Po ◽  
◽  
LIU Wen ◽  
WANG Yue ◽  
ZHAO Chun-Song ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Iron Phosphate ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Synthesis And Characterization ◽  
Co Doped

A test method of thermal time constant for uncooled infrared focal plane array

2019 ◽  
Vol 48 (12) ◽  
pp. 1204003
Author(s):  
刘子骥 Liu Ziji ◽  
赵晟晨 Zhao Shengchen ◽  
赵征庭 Zhao Zhengting ◽  
李聿达 Li Yuda ◽  
郑 兴 Zheng Xing ◽  
...  
Keyword(s):  
Time Constant ◽  
Focal Plane ◽  
Focal Plane Array ◽  
Test Method ◽  
Thermal Time ◽  
Infrared Focal Plane Array ◽  
Thermal Time Constant
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