Ion and electron-conducting additive effect on Li-ion charge storage performance of CuFe2O4/SiO2 composite aerogel anode. Issue 16 (November 2020)

• Record Type: Journal Article
• Authors: Balamurugan, S.; Naresh, N.; Prakash, I.; Satyanarayana, N.
• Is Part Of: Ceramics international. Volume 46:Issue 16(2020)Part A
• Page Start: 25330
• Page End: 25340
• Publication Date: 2020-11
• Subjects: A. Sol-gel process -- B. Nanocomposites -- C. Electrical conductivity -- D. SiO2 -- E. Batteries; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.06.327
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Series of Li2 O loaded CuFe2 O4 /SiO2 composite aerogels were prepared using a sol-gel process followed by a supercritical drying method. The physical and chemical properties of as-prepared aerogels were studied using different characterization techniques. Based on alternating current (AC) impedance analysis, the best conducting 5 wt% Li2 O loaded CuFe2 O4 /SiO2 composite aerogel with conductivity σ = 2.4 × 10 −9 S cm −1 is studied as anode for lithium-ion battery application. The best conducting composite aerogel provides a reversible Li-storage capacity of 605 mA h g −1 at 100 mA g −1 current density, which is more than the three-fold improved specific capacity of CuFe2 O4 /SiO2 having 182 mA h g −1 . The addition of Li2 O increases the charge carrier concentration and mobility of lithium-ions in the CuFe2 O4 /SiO2 composite aerogel matrix. Further, the Li-storage performance of 5 wt% Li2 O loaded CuFe2 O4 /SiO2 composite aerogel is improved by increasing the electron-conducting super-P carbon (SPC) blending ratio from 70: 20: 10 to 40: 50: 10 between active material: SPC: binder during electrode preparation. It delivers a reversible specific capacity of 880 mA h g −1 at 100 mA g −1 current density, and it reaches 98% coulombic efficiency over 50-cycles. The specific capacity and cyclability of Li2 O loaded CuFe2 O4 /SiO2 aerogel are highly dependent on electrical conductivity. The improved electrochemical performance of CuFe2 O4 /SiO2 aerogel is obtained through the combined effects of Li-ion concentration (Li2 O addition) as well as electron conducting (SPC) carbon additives.