Effect of particle size on dc conductivity, activation energy and diffusion coefficient of lithium iron phosphate in Li-ion cells
Cathode materials in nano size improve the performance of batteries due to the increased reaction rate and short diffusion lengths. Lithium Iron Phosphate (LiFePO4) is a promising cathode material for Li-ion batteries. However, it has its own limitations such as low conductivity and low diffusion co...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2016-03-01
|
| Series: | Engineering Science and Technology, an International Journal |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2215098615001019 |
| _version_ | 1818994771934314496 |
|---|---|
| author | T.V.S.L. Satyavani B. Ramya Kiran V. Rajesh Kumar A. Srinivas Kumar S.V. Naidu |
| author_facet | T.V.S.L. Satyavani B. Ramya Kiran V. Rajesh Kumar A. Srinivas Kumar S.V. Naidu |
| author_sort | T.V.S.L. Satyavani |
| collection | DOAJ |
| description | Cathode materials in nano size improve the performance of batteries due to the increased reaction rate and short diffusion lengths. Lithium Iron Phosphate (LiFePO4) is a promising cathode material for Li-ion batteries. However, it has its own limitations such as low conductivity and low diffusion coefficient which lead to high impedance due to which its application is restricted in batteries. In the present work, increase of conductivity with decreasing particle size of LiFePO4/C is studied. Also, the dependence of conductivity and activation energy for hopping of small polaron in LiFePO4/C on variation of particle size is investigated. The micro sized cathode material is ball milled for different durations to reduce the particle size to nano level. The material is characterized for its structure and particle size. The resistivities/dc conductivities of the pellets are measured using four probe technique at different temperatures, up to 150 °C. The activation energies corresponding to different particle sizes are calculated using Arrhenius equation. CR2032 cells are fabricated and electrochemical characteristics, namely, ac impedance and diffusion coefficients, are studied. |
| first_indexed | 2024-12-20T21:03:15Z |
| format | Article |
| id | doaj.art-00284d55cf6745659a0151a539a61a7c |
| institution | Directory Open Access Journal |
| issn | 2215-0986 |
| language | English |
| last_indexed | 2024-12-20T21:03:15Z |
| publishDate | 2016-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Engineering Science and Technology, an International Journal |
| spelling | doaj.art-00284d55cf6745659a0151a539a61a7c2022-12-21T19:26:40ZengElsevierEngineering Science and Technology, an International Journal2215-09862016-03-01191404410.1016/j.jestch.2015.05.011Effect of particle size on dc conductivity, activation energy and diffusion coefficient of lithium iron phosphate in Li-ion cellsT.V.S.L. Satyavani0B. Ramya Kiran1V. Rajesh Kumar2A. Srinivas Kumar3S.V. Naidu4N.S.T.L., Vigyan nagar, Visakhapaatnam, IndiaDepartment of Chemical Engineering, Andhra University, Visakhapatnam, IndiaN.S.T.L., Vigyan nagar, Visakhapaatnam, IndiaN.S.T.L., Vigyan nagar, Visakhapaatnam, IndiaDepartment of Chemical Engineering, Andhra University, Visakhapatnam, IndiaCathode materials in nano size improve the performance of batteries due to the increased reaction rate and short diffusion lengths. Lithium Iron Phosphate (LiFePO4) is a promising cathode material for Li-ion batteries. However, it has its own limitations such as low conductivity and low diffusion coefficient which lead to high impedance due to which its application is restricted in batteries. In the present work, increase of conductivity with decreasing particle size of LiFePO4/C is studied. Also, the dependence of conductivity and activation energy for hopping of small polaron in LiFePO4/C on variation of particle size is investigated. The micro sized cathode material is ball milled for different durations to reduce the particle size to nano level. The material is characterized for its structure and particle size. The resistivities/dc conductivities of the pellets are measured using four probe technique at different temperatures, up to 150 °C. The activation energies corresponding to different particle sizes are calculated using Arrhenius equation. CR2032 cells are fabricated and electrochemical characteristics, namely, ac impedance and diffusion coefficients, are studied.http://www.sciencedirect.com/science/article/pii/S2215098615001019Activation energydc conductivityac impedance and diffusion coefficient |
| spellingShingle | T.V.S.L. Satyavani B. Ramya Kiran V. Rajesh Kumar A. Srinivas Kumar S.V. Naidu Effect of particle size on dc conductivity, activation energy and diffusion coefficient of lithium iron phosphate in Li-ion cells Engineering Science and Technology, an International Journal Activation energy dc conductivity ac impedance and diffusion coefficient |
| title | Effect of particle size on dc conductivity, activation energy and diffusion coefficient of lithium iron phosphate in Li-ion cells |
| title_full | Effect of particle size on dc conductivity, activation energy and diffusion coefficient of lithium iron phosphate in Li-ion cells |
| title_fullStr | Effect of particle size on dc conductivity, activation energy and diffusion coefficient of lithium iron phosphate in Li-ion cells |
| title_full_unstemmed | Effect of particle size on dc conductivity, activation energy and diffusion coefficient of lithium iron phosphate in Li-ion cells |
| title_short | Effect of particle size on dc conductivity, activation energy and diffusion coefficient of lithium iron phosphate in Li-ion cells |
| title_sort | effect of particle size on dc conductivity activation energy and diffusion coefficient of lithium iron phosphate in li ion cells |
| topic | Activation energy dc conductivity ac impedance and diffusion coefficient |
| url | http://www.sciencedirect.com/science/article/pii/S2215098615001019 |
| work_keys_str_mv | AT tvslsatyavani effectofparticlesizeondcconductivityactivationenergyanddiffusioncoefficientoflithiumironphosphateinliioncells AT bramyakiran effectofparticlesizeondcconductivityactivationenergyanddiffusioncoefficientoflithiumironphosphateinliioncells AT vrajeshkumar effectofparticlesizeondcconductivityactivationenergyanddiffusioncoefficientoflithiumironphosphateinliioncells AT asrinivaskumar effectofparticlesizeondcconductivityactivationenergyanddiffusioncoefficientoflithiumironphosphateinliioncells AT svnaidu effectofparticlesizeondcconductivityactivationenergyanddiffusioncoefficientoflithiumironphosphateinliioncells |