Dr. Bereket Woldegbreal Taklu is currently work as a postdoctoral research fellow at the NTUST. Area of expertise focuses on lithium battery technology related to interface engineering, solid electrolyte development, and anode materials.
EDUCATION
National Taiwan University of Science and Technology
Wollo University
Bahir Dar University
Gondar University
RESEARCH INTERESTS
Any topics related with
Sulfide solid electrolyte;
Halide solid electrolyte;
Solid electrolyte / Li interface engineering;
Aqueous Zn ion battery;
Anode free lithium metal batteries
Dual-Functional Surface Engineering of Single-Crystal NMC Cathodes via Residue-to-Coating Conversion for Enhanced Interface Stability Shadab Ali Ahmed, Tripti Agnihotri, Ashok Ranjan, Chia‐Yu Chang, Rehbar Hasan, et al. Small, 2026 Nickel‐rich layered oxides, such as LiNi 0.83 Mn 0.06 Co 0.11 O 2 (NMC), are among the most promising cathode materials for high‐energy‐density lithium‐ion batteries. However, their practical implementation is limited by surface instability and the presence of residual lithium compounds, which degrade performance and complicate scalability. In this study, a dual‐functional surface modification strategy using lithium dihydrogen phosphate (LiH 2 PO 4 ) is presented. A wet impregnation procedure is used to transform the residual surface contaminants (LiOH, Li 2 CO 3 ) into an advantageous surface coating (Li 3 PO 4 ) on single crystal nickel‐rich (SCNMC) cathode materials rather than directly eliminating them through solvent washing process., as confirmed by titration and in situ Gas Chromotography‐Mas (GC‐MS), while the resulting ≈4 nm Li 3 PO 4 layer enhances structural stability, suppresses nickel migration, and mitigates electrolyte‐induced side reactions. Electrochemical tests reveal significantly improved cycling stability (72.96% capacity retention after 100 cycles at 0.2C compared to 18.25% for pristine SCNMC) and enhanced rate capability, supported by improved Li + diffusion kinetics. Synchrotron X‐ray Absorption Spectroscopy (XAS) and post‐mortem analyses further confirm the preservation of Ni oxidation states and reduced cross‐talk effects.
Structural evolution and stabilities of (CuIn)nTe2 and ((CuIn)nTe2)−(n = 1–8) clusters via DFT study Kidane Goitom Gerezgiher, Bereket Woldegbreal Taklu, Taame Abraha Berhe, Teklay Mezgebe Hagos, Hagos Woldeghebriel Zeweldi Rsc Advances, 2026 CuInTe 2 is a promising semiconductor with a tunable bandgap between 1.0 and 1.2 eV, allowing it to efficiently absorb sunlight and convert it into usable energy.
Potassium Underpotential Deposition for Defect-Free Lithium Deposition in Anode-Free Li-Metal Batteries Kassie Nigus Shitaw, Hailemariam Kassa Bezabh, Yosef Nikodimos, Misganaw Adigo Weret, Teshager Mekonnen Tekaligne, et al. Small Methods, 2025 Defects in deposited lithium (Li) severely cause dendrite growth and promote reactions between Li and electrolytes, resulting in active Li loss in anode‐free Li metal batteries (AFLMBs). Herein, potassium underpotential deposition (K‐UPD) is systematically established to heal defective Li and create a K‐Cu bimetallic interface, facilitating uniform bulk Li deposition. The K‐UPD at a potential of ≈1.0 V, higher than the equilibrium potentials of bulk K⁺ (0.1 V) and Li⁺ (0.0 V), significantly lowers the nucleation barrier and mitigates Li dendrite growth due to the better lithiophilicity of K metal compared to Cu. Meanwhile, the higher surface mobility of K atoms than Li atoms enables K metal to heal defects and prevent reactions between Li and electrolytes. The lower adsorption energy (ΔE) of the K atoms (−1.56 eV) than that of Li atoms (0.032 eV) indicates favorable adsorption of the K atom, as confirmed by DFT calculations. As a result, Cu||Li cell containing 1.3 M LiFSI+0.2 M KFSI bimetallic electrolyte reaches >1600 h, while Cu||NMC532 full‐cell achieves a higher average Coulombic efficiency (avg. CE) of 99.6% than the cell with 1.5 M LiFSI electrolyte (≈98.2%) after the 100th cycle. This work offers insights into the K‐UPD mechanism for enhancing interface stability and healing defects in deposited Li.