Basit Ali Raz Muhammad Mobinul Islam Daniel Adjah Anang Da-Seul Han Moeez, Iqra Chung, Kyung Yoon Cho, Min Kyung Kim, Ji Young Min-Gyu Kim Kyung-Wan Nam 2024-01-12T02:30:47Z 2024-01-12T02:30:47Z 2023-04-10 2023-04 2574-0962 https://pubs.kist.re.kr/handle/201004/75750 Li4Ti5O12 (LTO), an excellent anode for lithium-ion batteries (LIBs), suffers from low electronic conductivity, limiting its high-power rate application. An aliovalent metal ion doping strategy that tunes the electronic/ionic conductivity can mitigate this issue. In this work, we investigated a series of Cd2+ dopings on the Li4？xCdxTi5O12 (x = 0, 0.05, 0.10, and 0.20) anode material by considering its effect on structural and electrochemical performance in Li- and Na-ion batteries. Combined Rietveld refinement and X-ray absorption spectroscopy (XAS) analysis explicitly identified Cd2+ doping into the Li(8a) tetrahedral site of the cubic spinel LTO structure. According to high-resolution powder diffraction (HRPD), scanning electron microscopy (SEM), 4-point probe, and X-ray photoelectron spectroscopy (XPS), an increase in Cd2+ doping from 5 to 20% at the Li (8a) site in the LTO results in a reduction in particle size, an expansion of lattice, an increase in conductivity, and an increase in Ti3+ content to Ti4+ ratio. High-resolution scanning transmission electron microscopy (HR-STEM) confirms that cadmium ions are interstitially doped in the LTO structure. Compared to the pristine LTO electrode in the Li half cell, the Li3.80Cd0.20Ti5O12 (Cd0.20-LTO) electrode showed a significant improvement in capacity at high rates and excellent cycling performance. The improvement in performance for Cd0.20-doped LTO is a consequence of the reduction in the diffusion path and the faster Li-ion kinetics. Therefore, this Cd-doped LTO series of electrodes demonstrates advantageous features for Li-ion battery systems. English AMER CHEMICAL SOC Cd-Doped Li4-xCdxTi5O12 (x = 0.20) as a High Rate Capable and Stable Anode Material for Lithium-Ion Batteries Article 10.1021/acsaem.2c04143 1 ACS Applied Energy Materials, v.6, no.8, pp.4198 - 4210 ACS Applied Energy Materials 6 8 4198 4210 N scie scopus 000968715300001 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article NEGATIVE-ELECTRODE MATERIALS HIGH-RATE PERFORMANCE ELECTROCHEMICAL CHARACTERISTICS CATHODE MATERIALS NATURAL GRAPHITE SPINEL OXIDES LI4TI5O12 INSERTION TITANATE LIFE Cd-doped LTO spinel structure high rate capable lithium-ion batteries (LIBs) sodium-ion batteries (SIBs)