Mesoscopic modeling of Li insertion in phase-separating electrode materials: application to lithium iron phosphate

2014 ◽  
Vol 16 (41) ◽  
pp. 22555-22565 ◽  
Author(s):  
Mohammad Farkhondeh ◽  
Mark Pritzker ◽  
Michael Fowler ◽  
Mohammadhosein Safari ◽  
Charles Delacourt
Keyword(s):  
Phase Transition ◽  
Electrode Materials ◽  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
Mesoscopic Modeling ◽  
Proposed Model

The proposed model describes the lithiation–delithiation dynamics of LiFePO4 electrodes and is capable of simultaneously explaining various unusual behaviors observed for this phase transition material.

scholarly journals Morphology and Electrical Conductivity of Carbon Nanocoatings Prepared from Pyrolysed Polymers

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Marcin Molenda ◽  
Michał Świętosławski ◽  
Marek Drozdek ◽  
Barbara Dudek ◽  
Roman Dziembaj
Keyword(s):  
Electrical Conductivity ◽  
Electrode Materials ◽  
Lithium Iron Phosphate ◽  
Solid Phase ◽  
Scale Up ◽  
Iron Phosphate ◽  
Battery Cell ◽  
Pyromellitic Acid ◽  
Specific Morphology ◽  
Precursor Composition

Conductive carbon nanocoatings (conductive carbon layers—CCL) were formed onα-Al2O3model support using three different polymer precursors and deposition methods. This was done in an effort to improve electrical conductivity of the material through creating the appropriate morphology of the carbon layers. The best electrical properties were obtained with use of a precursor that consisted of poly-N-vinylformamide modified with pyromellitic acid (PMA). We demonstrate that these properties originate from a specific morphology of this layer that showed nanopores (3-4 nm) capable of assuring easy pathways for ion transport in real electrode materials. The proposed, water mediated, method of carbon coating of powdered supports combines coating from solution and solid phase and is easy to scale up process. The optimal polymer carbon precursor composition was used to prepare conductive carbon nanocoatings on LiFePO4cathode material. Charge-discharge tests clearly show that C/LiFePO4composites obtained using poly-N-vinylformamide modified with pyromellitic acid exhibit higher rechargeable capacity and longer working time in a battery cell than standard carbon/lithium iron phosphate composites.

Research of LiFePO4 as Positive Electrode Materials

2012 ◽  
Vol 217-219 ◽  
pp. 792-795
Author(s):  
Ling Na Sun
Keyword(s):  
Electrode Materials ◽  
Lithium Iron Phosphate ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Positive Electrode ◽  
Research Progress ◽  
Rechargeable Battery ◽  
Porous Structures ◽  
And Performance ◽  
Positive Electrode Materials

LiFePO4 is a promising cathode material for the next generation of a lithium-ion rechargeable battery. This paper introduces the research progress in recent years on LiFePO4 as positive electrode materials for lithium ion batteries. The methods of the preparation and modification, relation ship between structure and performance, and prospect of olivine-type lithium iron phosphate cathode materials was reviewed. Porous structures offer the potential to improve the electrochemical properties of LiFePO4.

State Estimation for Lithium-Ion Batteries With Phase Transition Materials Via Boundary Observers

2020 ◽  
Vol 143 (4) ◽  
Author(s):  
Shumon Koga ◽  
Leobardo Camacho-Solorio ◽  
Miroslav Krstic
Keyword(s):  
Phase Transition ◽  
Lithium Ion Batteries ◽  
Lithium Iron Phosphate ◽  
Moving Boundary ◽  
Active Material ◽  
Lithium Ion ◽  
Estimation Algorithm ◽  
Iron Phosphate ◽  
Particle Model ◽  
Lithium Ions

Abstract Lithium iron phosphate (LiFePO4 or LFP) is a common active material in lithium-ion batteries. It has been observed that this material undergoes phase transitions during the normal charge and discharge operation of the battery. Electrochemical models of lithium-ion batteries can be modified to account for this phenomenon at the expense of some added complexity. We explore this problem for the single particle model (SPM) where the underlying dynamic model for diffusion of lithium ions in phase transition materials is a partial differential equation (PDE) with a moving boundary. We derive a novel boundary observer to estimate the concentration of lithium ions together with a moving boundary radius from the SPM via the backstepping method for PDEs, and simulations are provided to illustrate the performance of the observer. Our comments are stated on the gap between the proposed observer and a complete state-of-charge (SoC) estimation algorithm for lithium-ion batteries with phase transition materials.

scholarly journals Nanomaterials for lithium-ion batteries and hydrogen energy

2017 ◽  
Vol 89 (8) ◽  
pp. 1185-1194 ◽  
Author(s):  
Irina A. Stenina ◽  
Andrey B. Yaroslavtsev
Keyword(s):  
Fuel Cells ◽  
Lithium Ion Batteries ◽  
Alternative Energy ◽  
Electrode Materials ◽  
Lithium Iron Phosphate ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Inorganic Nanoparticles ◽  
Hydrogen Energy

Abstract Development of alternative energy sources is one of the main trends of modern energy technology. Lithium-ion batteries and fuel cells are the most important among them. The increase in the energy and power density is the essential aspect which determined their future development. We provide a brief review of the state of developments in the field of nanosize electrode materials and electrolytes for lithium-ion batteries and hydrogen energy. The presence of relatively inexpensive and abundant elements, safety and low volume change during the lithium intercalation/deintercalation processes enables the application of lithium iron phosphate and lithium titanate as electrode materials for lithium-ion batteries. At the same time, they exhibit low ionic and electronic conductivity. To overcome this problem the following main approaches have been applied: use of nanosize materials, including nanocomposites, and heterovalent doping. Their impact in the property change is analyzed and discussed. Hybrid membranes containing inorganic nanoparticles enable a significant progress in the fuel cell development. Different approaches to their preparation, the reasons for ion conductivity and selectivity change, as well as the prospects for their application in low-temperature fuel cells are discussed. This review may provide some useful guidelines for development of advanced materials for lithium ion batteries and fuel cells.

State Estimation for Lithium Ion Batteries With Phase Transition Materials

2017 ◽  
Author(s):  
Shumon Koga ◽  
Leobardo Camacho-Solorio ◽  
Miroslav Krstic
Keyword(s):  
Phase Transition ◽  
Lithium Ion Batteries ◽  
Lithium Iron Phosphate ◽  
Moving Boundary ◽  
Active Material ◽  
Lithium Ion ◽  
Estimation Algorithm ◽  
Iron Phosphate ◽  
Particle Model ◽  
Lithium Ions

Lithium Iron Phosphate (LiFePO4 or LFP) is a common active material in lithium-ion batteries. It has been observed that this material undergoes phase transitions during the normal charge and discharge operation of the battery. Electrochemical models of lithium-ion batteries can be modified to account for this phenomena at the expense of some added complexity. We explore this problem for the single particle model (SPM) where the underlying dynamic model for diffusion of lithium ions in phase transition materials is a partial differential equation (PDE) with a moving boundary. An observer is derived for the concentration of lithium ions from the SPM via the backstepping method for PDEs in a rigorous way and simulations are provided to illustrate the performance of the observer. Our comments are stated on the gap between the proposed observer and a complete state-of-charge (SoC) estimation algorithm for lithium-ion batteries with phase transition materials.

Research on Performance and Preparation of LiFePO4

2014 ◽  
Vol 686 ◽  
pp. 31-35
Author(s):  
Yan Li
Keyword(s):  
Electrochemical Performance ◽  
Cathode Material ◽  
Particle Deposition ◽  
Electrode Materials ◽  
Lithium Iron Phosphate ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Structure Characterization ◽  
Synthetic Methods ◽  
Material Particle

This paper makes use of various synthetic methods and analysis techniques, from material preparation, structure characterization of the electrochemical performance, we systematic study lithium iron phosphate, preparation electrode materials with good performance. This paper mainly aims at the two fatal drawbacks restrict the performance of LiFePO4cathode material, namely, low electron conductivity and lithium ion diffusion rate low, take the material particle, particle deposition on the surface of carbon conductive layer and Mg2+ion doping and other measures to modify it to explore, in order to improve the electrochemical performance of LiFePO4cathode material.

A Simple Way of Pre-Doping Lithium Ion into Carbon Negative Electrode for Lithium Ion Capacitor

2010 ◽  
Vol 650 ◽  
pp. 142-149 ◽  
Author(s):  
Feng Wu ◽  
Hua Quan Lu ◽  
Yue Feng Su ◽  
Shi Chen ◽  
Yi Biao Guan
Keyword(s):  
Electrode Materials ◽  
Lithium Iron Phosphate ◽  
High Capacity ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Positive Electrode ◽  
Simple Strategy ◽  
Lithium Ion Capacitor ◽  
First Time

A simple strategy of pre-doping lithium ion into carbon negative electrode for lithium ion capacitor was introduced. In this strategy, a kind of Li-containing compound was added directly into the positive electrode of the lithium ion capacitor (LIC). When the lithium ion capacitor was charging first time, the Li-containing compound releases Li+, and the pre-doping of lithium ion into the negative electrode was performed. Here, we developed a lithium ion capacitor using Meso-carbon microbeads (MCMB)/activated carbon (AC) as the negative and positive electrode materials, respectively and use the lithium iron phosphate (LiFePO4) as the Li-containing compound, which supply the Li+ ions for pre-doping. The results demonstrated that, by adding 20 percent of LiFePO4 into the positive electrode, the efficiency of the capacitor increases from lower than 60% up to higher than 90%, and the capacitor shows good capacitance characteristics and high capacity.

Review: Phase transition mechanism and supercritical hydrothermal synthesis of nano lithium iron phosphate

2020 ◽  
Vol 46 (18) ◽  
pp. 27922-27939 ◽  
Author(s):  
Baoquan Zhang ◽  
Shuzhong Wang ◽  
Yanhui Li ◽  
Panpan Sun ◽  
Chuang Yang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Hydrothermal Synthesis ◽  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
Transition Mechanism ◽  
Supercritical Hydrothermal Synthesis

Pneumatic separation and recycling of anode and cathode materials from spent lithium iron phosphate batteries

2019 ◽  
Vol 37 (4) ◽  
pp. 374-385 ◽  
Author(s):  
Haijun Bi ◽  
Huabing Zhu ◽  
Lei Zu ◽  
Shuanghua He ◽  
Yong Gao ◽  
...  
Keyword(s):  
Particle Size ◽  
Electrode Material ◽  
Present Model ◽  
Electrode Materials ◽  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
Airflow Velocity ◽  
Novel Approach ◽  
Mass Fractions ◽  
Pneumatic Separation

A novel approach to recycling of copper and aluminum fragments in the crushed products of spent lithium iron phosphate batteries was proposed to achieve their eco-friendly processing. The model of pneumatic separation that determines the optimal airflow velocity was established using aerodynamics. The influence of the airflow velocity, and the density and thickness, and their ratios, of the aluminum and copper fragments on pneumatic separation were evaluated. The results show that the optimal airflow velocities of copper and aluminum fragments with and without the electrode materials are 3.27m/s and 1.67m/s, respectively. The accuracy and reliability of the present model was verified using a pneumatic separation experiment. It is concluded that graded pneumatic separation is unnecessary for the crushed particle size more than 9 mm. The experimentally determined optimal airflow velocity of the copper and aluminum fragments with and without the electrode materials is 3.3m/s and 1.7m/s, respectively. The mass fractions of the copper and aluminum fragments upon removal of the electrode materials after pneumatic separation are 97% and 96%, respectively, and both with the electrode material achieve 97.0%. The theoretically obtained optimal airflow velocities have good agreements with the experimentally obtained ones.

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