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Fekadu Wubatu Fenta, Bizualem Wakuma Olbasa, Meng-Che Tsai, Misganaw Adigo Weret, Tilahun Awoke Zegeye, Chen-Jui Huang, Wei-Hsiang Huang, Tamene Simachew Zeleke, Niguse Aweke Sahalie, Chih-Wen Pao, She-huang Wu, Wei-Nien Su, Hongjie Dai, Bing Joe Hwang
J. Mater. Chem. A, 2020, 8(34), 17595-17607 (IF: 11.301)
Scientific achievement
-
Copper stabilized and manganese-deficient Cu0.044MnO was synthesized through hydrothermal, reflux and calcination steps.
-
Electrochemical activation of Cu0.044MnO starts during first charging, which results in the formation of Cu-MnO2.nH2O nanoflowers.
-
The reversible H+ conversion and Zn2+ intercalation process take place in the activated Cu-MnO2.nH2O.
-
Manganese vacancy is also observed in Cu-MnO2.nH2O, which triggers lattice oxygen redox.
-
The activated cathode delivered a high specific capacity of 320 mAh g-1 at 0.5C.
Significant and impact
-
The copper doping and formation of manganese vacancies distorted Cu-MnO, making electrochemically active for Zn2+ storage.
-
The Mn vacancies provide additional storage and pathways for the mobility of Zn2+ ions, which deliver high capacity and long cycling stability.
-
lower valence manganese oxides can act as promising cathode materials through phase transformation for zinc-ion batteries.
Research details and highlights
-
Cu doped and lower valance Cu-MnO cathode material was designed for ZIBs cathode materials
-
Material characterization, phase transformation, and energy storage mechanism ware investigated by XRD, XAS, XPS, TEM characterization techniques
-
Electrochemical tests were analyzed through CV, EIS, and galvanostatic charge-discharge techniques
Kassie Nigus Shitaw, Sheng‐Chiang Yang, Shi‐Kai Jiang, Chen‐Jui Huang, Niguse Aweke Sahalie, Yosef Nikodimos, Haile Hisho Weldeyohannes, Chia‐Hsin Wang, She‐Huang Wu, Wei‐Nien Su, Bing Joe Hwang
Advanced Functional Materials, 2020/11/9, 2006951 (IF: 16.836)
Scientific achievement
-
Interfacial reactions at the anode and cathode surfaces in Cu/NMC111 cells were successfully decoupled using a protocol combining EL-CELL with GC-MS (OEMS) for the first time.
-
This study helps to develop stable and high performance electrolytes.
Significant and impact
-
The AFLMB is a reliable configuration for the study of interfacial reactions at both electrodes in the rechargeable batteries
-
It is identified that the evolved gases at the anode and cathode in LMB were coupled and difficult to decouple the interfacial reactions using LMB configuration.
Research details and highlights
-
A protocol combining EL-Cell with GC-MS was used.
-
1 M LiPF6 in EC/DEC and EC/EMC electrolytes were selected for this study.
-
The evolved gases in AFLMBs and LMBs were compared.
-
The interfacial reaction pathways were proposed based on OEMS and XPS analyses.
Teklay Mezgebe Hagos, Tesfaye Teka Hagos, Hailemariam Kassa Bezabh, Gebregziabher Brhane Berhe, Ljalem Hadush Abrha, Shuo-Feng Chiu, Chen-Jui Huang, Wei-Nien Su, Hongjie Dai, Bing Joe Hwang
ACS Appl. Energy Mater. 2020, 3, 11, 10722–10733 (IF=4.473 )
Scientific achievement
-
Nonflammable and high rate capability of EMC-based fluorinated electrolyte (FEC/TTE/EMC2) developed.
-
The new electrolyte have superior oxidative stability and free of phase separation (homogeneous solution).
Significant and impact
-
The advanced developed electrolyte have high ionic conductivity and low viscosity.
-
FEC/TTE/EMC2 have higher oxidative stability (> 5.3 V) with a minimum current leakage and enhance the rate capability (0.1 to 2 mA/cm2).
-
Provides higher capacity of retention (40%) and average CE of 98.30% for 80 cycles in Cu‖NMC111 cell at the charge and discharge current densities of 0.2 and 0.5 mA/cm2, respectively.
Research details and highlights
-
Density meter (DMA 4500 (Anton Paar)) and a rolling ball Lovis (2000M/ME) micro viscometer were used for measurement of density and viscosity of the electrolyte.
-
Electrochemical methods were used to measure the robustness of the electrolyte.
-
Electrolyte stability was evaluated using LSV and floating test.
Nucleation and Growth Mechanism of Lithium Metal Electroplating
Balamurugan Thirumalraj, Tesfaye Teka Hagos, Chen-Jui Huang, Minbale Admas Teshager, Ju-Hsiang Cheng, Wei-Nien Su, Bing-Joe Hwang
Prof. Hwang's team has developed the Li-SEI model, which successfully extracted the quantitative parameters of lithium metal nucleation and growth and SEI crack (fracture) rate constant, to break through the dilemma that can only be described qualitatively in the past. This is very helpful to further understand the lithium metal deposition and the characteristics of forming SEI. This important work will help future research and development of high-energy, high-safety anode-free lithium batteries.
Tamene Simachew Zeleke, Meng-Che Tsai, Misganaw Adigo Weret, Chen-Jui Huang, Mulatu Kassie Birhanu, Tzu-Ching Liu, Chiu-Ping Huang, Yun-Liang Soo, Yaw-Wen Yang, Wei-Nien Su, Bing-Joe Hwang
Prof. Hwang’s group recently reported that the MoS2 single-molecular catalyst with the record loading of ~ 40% was synthesized by an electrochemical method, and showed excellent site activity (turnover frequency, TOF) for hydrogen-generation.
Soressa Abera Chala, Meng-Che Tsai, Wei-Nien Su, Kassa Belay Ibrahim, Balamurugan Thirumalraj, Ting-Shan Chan, Jyh-Fu Lee, Hongjie Dai, Bing-Joe Hwang
ACS Nano, published on Jan. 31, 2020, doi: 10.1021/acsnano.9b07487 (IF=13.903)
Prof. Hwang's team has established a novel approach and highly active bifunctional oxygen electrocatalyst using a hierarchical 3D architectured NiMn-LDHs nanosheets shells grown on conductive substrate of Ag Nanowires. The hybrid catalyst exhibited previously unachieved catalytic activity toward OER/ORR with excellent durability. This core-shelling approach is a facile design concept that generates exposed coordinatively unsaturated metal sites with open-pore nanostructure of heterogeneous catalyst. This approach targets to provide insight into strategies to design catalysts for their integration in industrially relevant metal-air battery systems and emerging fuels devices.
Zn-air battery cell
Tesfaye Teka Hagos, Balamurugan Thirumalraj, Chen-Jui Huang, Ljalem Hadush Abrha, Teklay Mezgebe Hagos, Gebregziabher Brhane Berhe, Hailemariam Kassa Bezabh, Jim Cherng, Shuo-Feng Chiu, Wei-Nien Su, Bing-Joe Hwang
ACS Appl. Mater. Interfaces 2019, 11, 10, 9955-9963 (IF= 8.456)
-
Locally-concentrated electrolyte, 2M LiPF6 in ethylene carbonate (EC)/diethyl carbonate (DEC) (1:1 v/v ratio) diluted with fluoroethylene carbonate (FEC) which is stable within wide potential range (2.5-4.5 V) is achieved for the first time.
Scientific achievement
Significance and impact
-
The enhanced cycle life and well-retained capacity can be attributed to the synergetic effect of FEC as the diluent to increase the ionic conductivity and the locally-concentrated electrolyte that forms stable anion-derived SEI.
-
The locally-concentrated electrolyte also shows high robustness to the effect of upper limit cut-off voltageFrom RDF and Raman evidences, the solvation structure was not changed after dilution.
Commerical carbonate
Locally concentrated
electrolyte
Research details or highlights
-
Locally concentrated carbonate-based electrolyte was prepared
-
Locally concentrated carbonate-based electrolyte showed better performance in AFLMBs than diluted and concentered electrolytes
-
The solvation sheath of Li+ was evaluated by Raman and MD simulation( RDF)
-
Electrolyte stability was evaluated using CV and floating test
Roles of film-forming additives in diluted and concentrated electrolytes for lithium metal batteries: A density functional theory-based approach
Hailemariam Kassa Bezabh, Meng-Che Tsai, Tesfaye Teka Hagos, Tamene Tadesse Beyene, Gebregziabher Brhane Berhe, Teklay Mezgebe Hagos, Ljalem Hadush Abrha, Shuo-Feng Chiu, Wei-Nien Su, Bing-Joe Hwang
Prof. Hwang's team has investigated to clarify the solvation structure of Li+-ion in bulk phase and the adsorbed species on Li-anode surface for diluted [Li+ FEC(EC)n, Li+(EC)n (n = 1–4)], and concentrated (Li+FEC(EC)n(PF6 −) (n = 0–3) electrolytes using DFT calculation for the first time , which successfully found that pure EC-solvated Li+-ion species on Li-anode surface was found weaker than EC and FEC co-solvated Li+-ion species in the diluted electrolyte. The dominant species on the Li-anode surface are found Li+FEC(EC)3 and Li+FEC(EC)2PF6− in a diluted and concentrated electrolyte, respectively. This work exploring the preferential adsorbed species via DFT computation paves a new way to study the role of additives in the formation of SEI.
J. Mater. Chem. A, 2020, 8(34), 17595-17607 (IF: 11.301)
Scientific achievement
-
Copper stabilized and manganese-deficient Cu0.044MnO was synthesized through hydrothermal, reflux and calcination steps.
-
Electrochemical activation of Cu0.044MnO starts during first charging, which results in the formation of Cu-MnO2.nH2O nanoflowers.
-
The reversible H+ conversion and Zn2+ intercalation process take place in the activated Cu-MnO2.nH2O.
-
Manganese vacancy is also observed in Cu-MnO2.nH2O, which triggers lattice oxygen redox.
-
The activated cathode delivered a high specific capacity of 320 mAh g-1 at 0.5C.
Significant and impact
-
The copper doping and formation of manganese vacancies distorted Cu-MnO, making electrochemically active for Zn2+ storage.
-
The Mn vacancies provide additional storage and pathways for the mobility of Zn2+ ions, which deliver high capacity and long cycling stability.
-
lower valence manganese oxides can act as promising cathode materials through phase transformation for zinc-ion batteries.
Research details and highlights
-
Cu doped and lower valance Cu-MnO cathode material was designed for ZIBs cathode materials
-
Material characterization, phase transformation, and energy storage mechanism ware investigated by XRD, XAS, XPS, TEM characterization techniques
-
Electrochemical tests were analyzed through CV, EIS, and galvanostatic charge-discharge techniques
Kassie Nigus Shitaw, Sheng‐Chiang Yang, Shi‐Kai Jiang, Chen‐Jui Huang, Niguse Aweke Sahalie, Yosef Nikodimos, Haile Hisho Weldeyohannes, Chia‐Hsin Wang, She‐Huang Wu, Wei‐Nien Su, Bing Joe Hwang
Advanced Functional Materials, 2020/11/9, 2006951 (IF: 16.836)
Scientific achievement
-
Interfacial reactions at the anode and cathode surfaces in Cu/NMC111 cells were successfully decoupled using a protocol combining EL-CELL with GC-MS (OEMS) for the first time.
-
This study helps to develop stable and high performance electrolytes.
Significant and impact
-
The AFLMB is a reliable configuration for the study of interfacial reactions at both electrodes in the rechargeable batteries
-
It is identified that the evolved gases at the anode and cathode in LMB were coupled and difficult to decouple the interfacial reactions using LMB configuration.
Research details and highlights
-
A protocol combining EL-Cell with GC-MS was used.
-
1 M LiPF6 in EC/DEC and EC/EMC electrolytes were selected for this study.
-
The evolved gases in AFLMBs and LMBs were compared.
-
The interfacial reaction pathways were proposed based on OEMS and XPS analyses.
Teklay Mezgebe Hagos, Tesfaye Teka Hagos, Hailemariam Kassa Bezabh, Gebregziabher Brhane Berhe, Ljalem Hadush Abrha, Shuo-Feng Chiu, Chen-Jui Huang, Wei-Nien Su, Hongjie Dai, Bing Joe Hwang
ACS Appl. Energy Mater. 2020, 3, 11, 10722–10733 (IF=4.473 )
Scientific achievement
-
Nonflammable and high rate capability of EMC-based fluorinated electrolyte (FEC/TTE/EMC2) developed.
-
The new electrolyte have superior oxidative stability and free of phase separation (homogeneous solution).
Significant and impact
-
The advanced developed electrolyte have high ionic conductivity and low viscosity.
-
FEC/TTE/EMC2 have higher oxidative stability (> 5.3 V) with a minimum current leakage and enhance the rate capability (0.1 to 2 mA/cm2).
-
Provides higher capacity of retention (40%) and average CE of 98.30% for 80 cycles in Cu‖NMC111 cell at the charge and discharge current densities of 0.2 and 0.5 mA/cm2, respectively.
Research details and highlights
-
Density meter (DMA 4500 (Anton Paar)) and a rolling ball Lovis (2000M/ME) micro viscometer were used for measurement of density and viscosity of the electrolyte.
-
Electrochemical methods were used to measure the robustness of the electrolyte.
-
Electrolyte stability was evaluated using LSV and floating test.
Nucleation and Growth Mechanism of Lithium Metal Electroplating
Balamurugan Thirumalraj, Tesfaye Teka Hagos, Chen-Jui Huang, Minbale Admas Teshager, Ju-Hsiang Cheng, Wei-Nien Su, Bing-Joe Hwang
Prof. Hwang's team has developed the Li-SEI model, which successfully extracted the quantitative parameters of lithium metal nucleation and growth and SEI crack (fracture) rate constant, to break through the dilemma that can only be described qualitatively in the past. This is very helpful to further understand the lithium metal deposition and the characteristics of forming SEI. This important work will help future research and development of high-energy, high-safety anode-free lithium batteries.
Tamene Simachew Zeleke, Meng-Che Tsai, Misganaw Adigo Weret, Chen-Jui Huang, Mulatu Kassie Birhanu, Tzu-Ching Liu, Chiu-Ping Huang, Yun-Liang Soo, Yaw-Wen Yang, Wei-Nien Su, Bing-Joe Hwang
Prof. Hwang’s group recently reported that the MoS2 single-molecular catalyst with the record loading of ~ 40% was synthesized by an electrochemical method, and showed excellent site activity (turnover frequency, TOF) for hydrogen-generation.
Soressa Abera Chala, Meng-Che Tsai, Wei-Nien Su, Kassa Belay Ibrahim, Balamurugan Thirumalraj, Ting-Shan Chan, Jyh-Fu Lee, Hongjie Dai, Bing-Joe Hwang
ACS Nano, published on Jan. 31, 2020, doi: 10.1021/acsnano.9b07487 (IF=13.903)
Prof. Hwang's team has established a novel approach and highly active bifunctional oxygen electrocatalyst using a hierarchical 3D architectured NiMn-LDHs nanosheets shells grown on conductive substrate of Ag Nanowires. The hybrid catalyst exhibited previously unachieved catalytic activity toward OER/ORR with excellent durability. This core-shelling approach is a facile design concept that generates exposed coordinatively unsaturated metal sites with open-pore nanostructure of heterogeneous catalyst. This approach targets to provide insight into strategies to design catalysts for their integration in industrially relevant metal-air battery systems and emerging fuels devices.
Zn-air battery cell
Tesfaye Teka Hagos, Balamurugan Thirumalraj, Chen-Jui Huang, Ljalem Hadush Abrha, Teklay Mezgebe Hagos, Gebregziabher Brhane Berhe, Hailemariam Kassa Bezabh, Jim Cherng, Shuo-Feng Chiu, Wei-Nien Su, Bing-Joe Hwang
ACS Appl. Mater. Interfaces 2019, 11, 10, 9955-9963 (IF= 8.456)
-
Locally-concentrated electrolyte, 2M LiPF6 in ethylene carbonate (EC)/diethyl carbonate (DEC) (1:1 v/v ratio) diluted with fluoroethylene carbonate (FEC) which is stable within wide potential range (2.5-4.5 V) is achieved for the first time.
Scientific achievement
Significance and impact
-
The enhanced cycle life and well-retained capacity can be attributed to the synergetic effect of FEC as the diluent to increase the ionic conductivity and the locally-concentrated electrolyte that forms stable anion-derived SEI.
-
The locally-concentrated electrolyte also shows high robustness to the effect of upper limit cut-off voltageFrom RDF and Raman evidences, the solvation structure was not changed after dilution.
Commerical carbonate
Locally concentrated
electrolyte
Research details or highlights
-
Locally concentrated carbonate-based electrolyte was prepared
-
Locally concentrated carbonate-based electrolyte showed better performance in AFLMBs than diluted and concentered electrolytes
-
The solvation sheath of Li+ was evaluated by Raman and MD simulation( RDF)
-
Electrolyte stability was evaluated using CV and floating test
Roles of film-forming additives in diluted and concentrated electrolytes for lithium metal batteries: A density functional theory-based approach
Hailemariam Kassa Bezabh, Meng-Che Tsai, Tesfaye Teka Hagos, Tamene Tadesse Beyene, Gebregziabher Brhane Berhe, Teklay Mezgebe Hagos, Ljalem Hadush Abrha, Shuo-Feng Chiu, Wei-Nien Su, Bing-Joe Hwang
Prof. Hwang's team has investigated to clarify the solvation structure of Li+-ion in bulk phase and the adsorbed species on Li-anode surface for diluted [Li+ FEC(EC)n, Li+(EC)n (n = 1–4)], and concentrated (Li+FEC(EC)n(PF6 −) (n = 0–3) electrolytes using DFT calculation for the first time , which successfully found that pure EC-solvated Li+-ion species on Li-anode surface was found weaker than EC and FEC co-solvated Li+-ion species in the diluted electrolyte. The dominant species on the Li-anode surface are found Li+FEC(EC)3 and Li+FEC(EC)2PF6− in a diluted and concentrated electrolyte, respectively. This work exploring the preferential adsorbed species via DFT computation paves a new way to study the role of additives in the formation of SEI.
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