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Title: Development of surface functionalized ZnO-doped LiFePO 4 /C composites as alternative cathode material for lithium ion batteries
Authors: Saroha R.
Panwar A.K.
Sharma, Yogesh Kumar
Tyagi P.K.
Ghosh S.
Published in: Applied Surface Science
Abstract: Surface modified olivine-type LiFePO 4 /C-ZnO doped samples were synthesized using sol-gel assisted ball-milling route. In this work, the influence of ZnO-doping on the physiochemical, electrochemical and surface properties such as charge separation at solid-liquid interphase, surface force gradient, surface/ionic conductivity of pristine LiFePO 4 /C (LFP) has been investigated thoroughly. Synthesized samples were characterized using X-ray diffraction, scanning electron microscopy, atomic force microscopy, and transmission electron microscopy. All the synthesized samples were indexed to the orthorhombic phase with Pnma space group. Pristine LiFePO 4 retain its structure for higher ZnO concentrations (i.e. 2.5 and 5.0 wt.% of LFP). Surface topography and surface force gradient measurements by EFM revealed that the kinetics of charge carriers, e − /Li + is more in ZnO-doped LFP samples, which may be attributed to diffusion or conduction process of the charges present at the surface. Among all the synthesized samples LFP/C with 2.5 wt.% of ZnO (LFPZ2.5) displays the highest discharge capacity at all C-rates and exhibit excellent rate performance. LFPZ2.5 delivers a specific discharge capacity of 164 (±3) mAh g −1 at 0.1C rate. LFPZ2.5 shows best cycling performance as it provides a discharge capacity of 135 (±3) mAh g −1 at 1C rate and shows almost 95% capacity retention after 50 charge/discharge cycles. Energy density plot shows that LFPZ2.5 offers high energy and power density measured at high discharge rates (5C), proving its usability for hybrid vehicles application. © 2016
Citation: Applied Surface Science, 394: 25-36
Issue Date: 2017
Publisher: Elsevier B.V.
Keywords: Charge separation
Ragone plot
Surface force gradient
ISSN: 1694332
Author Scopus IDs: 57031976000
Author Affiliations: Saroha, R., Department of Applied Physics, Delhi Technological University, Delhi, 110042, India
Panwar, A.K., Department of Applied Physics, Delhi Technological University, Delhi, 110042, India
Sharma, Y., Department of Physics, IIT Roorkee, Roorkee, Uttarakhand 247667, India
Tyagi, P.K., Department of Applied Physics, Delhi Technological University, Delhi, 110042, India
Ghosh, S., Department of Metallurgical & Materials Engineering, IIT KharagpurWest Bengal 721302, India
Funding Details: Authors are thankful to SERB, Department of Science and Technology (DST), New Delhi for financial support to carry out this work under the project FTP/PS/039/2011. Authors also give sincere thanks to Ms. Anshika Singh for helping in the EFM measurements with existing AFM facility at Advance Instrumentation Centre, DTU. Department of Science and Technology, Ministry of Science and Technology, India, डीएसटी: FTP/PS/039/2011; Science and Engineering Research Board, SERB
Corresponding Author: Panwar, A.K.; Department of Applied Physics, India; email:
Appears in Collections:Journal Publications [PH]

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