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Nano-composite LiMnPO4 as new insertion electrode for electrochemical supercapacitors

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Title Nano-composite LiMnPO4 as new insertion electrode for electrochemical supercapacitors
 
Creator PRABAHARAN, SRS
STAR, RA
KULKARNI, AR
MICHAEL, MS
 
Subject RECHARGEABLE LITHIUM BATTERIES
LI-ION CAPACITORS
AQUEOUS-ELECTROLYTE
CATHODE MATERIAL
LIXMPO4 M
PERFORMANCE
CARBON
STORAGE
MN
FE
LiMnPO4
Ex-situ carbon coating
Meso-porous carbon
Li-ion capacitors
Electrochemical
Supercapacitors
 
Description Nano-composite olivine LiMnPO4 (nC-LMP) was found to exhibit facile pseudo-capacitive characteristics in aqueous as well as non-aqueous electrolytes. We demonstrated employing nC-LMP as positive electrode in hybrid electrochemical capacitors namely Li-Ion hybrid capacitors (LIC). Adapting a simple CVD technique, nano-crystallites of LiMnPO4 were coated with carbon monolayers of similar to 2 nm thick to circumvent its poor intrinsic electronic conductivity. The novelty is that the single crystallites were intimately covered with carbon ring and networked to the neighboring crystallites via the continuous carbon wire-like connectivity as revealed from HRTEM analysis. Single electrode faradic capacitance of 3025 Fg(-1) (versus standard calomel reference electrode) was deduced for carbon coated LMP, the highest reported hitherto in Li+ aqueous electrolytes. Employing nC-LMP as working electrode versus an activated carbon (AC), we obtained a high specific energy of 28.8 Wh kg(-1) with appreciable stability in aqueous electrolytes whereas in nonaqueous electrolyte there is an obvious increase in energy density (35 Wh kg(-1)) due to wider potential window. That is, a full cell version of LIC, AC vertical bar Li+vertical bar LMP, was fabricated and demonstrated its facile cycling characteristics via removal/insertion of Li+ within nC-LMP (positive electrode) and the electrosorption of Li+ into mesoporous carbon (AC) (negative electrode). Such cells ensured a typical battery-like charging and EDLC-like discharging characteristics of LIC type electrochemical capacitors (ECs) which are desired to enhance safety and energy densities. (C) 2015 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2016-01-14T13:10:26Z
2016-01-14T13:10:26Z
2015
 
Type Article
 
Identifier CURRENT APPLIED PHYSICS, 15(12)1624-1633
1567-1739
1878-1675
http://dx.doi.org/10.1016/j.cap.2015.09.009
http://dspace.library.iitb.ac.in/jspui/handle/100/17580
 
Language en