Article
Chemistry, Physical
Chenxi Geng, Divya Rathore, Dylan Heino, Nutthaphon Phattharasupakun, J. R. Dahn
Summary: In this study, tantalum-containing LiNiO2 material was synthesized by coating and its structural and electrochemical properties were investigated. The experimental results showed that LiNiO2 containing 0.75 mol% Ta exhibited the best capacity retention among all the synthesized samples.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Multidisciplinary
Jianxin Kang, Yufeng Xue, Jie Yang, Qi Hu, Qinghua Zhang, Lin Gu, Annabella Selloni, Li-Min Liu, Lin Guo
Summary: This study reports the discovery of two-electron transfer in monolayer Ni(OH)2 nanosheets, which is different from the traditional one-electron transfer found in multilayer materials. The experimental results show that the monolayer material has an exceptional redox capacity nearly two times higher than the theoretical capacity of one-electron processes. In situ experiments further demonstrate that the monolayer material can transfer two electrons, while the bulk material can only undergo partial transformation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Electrochemistry
Matthew D. L. Garayt, Ning Zhang, Svena Yu, Jeffin James Abraham, Aidan Murphy, Roee Omessi, Ziwei Ye, Saad Azam, Michel B. Johnson, Chongyin Yang, J. R. Dahn
Summary: Cobalt-free, single crystal layered-oxide positive electrode material, Li1+x[Ni0.6Mn0.4](1-x)O-2 (NM64), has been successfully synthesized using a simple all-dry process. The synthesized NM64 has low nickel content in the lithium layer, small particle size, and excellent high-voltage stability. Furthermore, tungsten coating can decrease particle size and improve cycling stability in half cells.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Review
Materials Science, Multidisciplinary
Liangtao Yang, Qing Liu, Zhilin Zhang, Lu Gan, Yi Zhang, Jinglong Wu
Summary: Electroencephalography (EEG) is widely used in brain cognition, clinical diagnosis, and artificial intelligence, but the traditional Ag/AgCl electrode requires complex pre-preparation. Therefore, the development of dry electrodes is urgently needed to simplify the testing process and improve subject comfort.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Cong Li, Chun Liu, Honglei Liu, Chengzhi Hu, Yong Wu, Afei Li, Zhangxian Chen, Zeheng Yang, Weixin Zhang
Summary: An in situ epitaxial growth strategy was used to construct a thin layer of LiNi0.25Mn0.75O2 on the surface of LiNi0.8Co0.1Mn0.1O2 (NCM811). This LiNi0.25Mn0.75O2 layer can be electrochemically converted into a stable spinel LiNi0.5Mn1.5O4 (LNM) under high voltage cycling, which acts as a protective layer to alleviate harmful side reactions and suppress oxygen release.
Article
Chemistry, Analytical
Rugeng Liu, Xiang Peng, Xu Han, Chun Hong Mak, Kuan-Chen Cheng, Shella Permatasari Santoso, Hsin-Hui Shen, Qingdong Ruan, Fahe Cao, Edward T. Yu, Paul K. Chu, Hsien-Yi Hsu
Summary: Carbon-based conductive materials, specifically Ni-doped TiN nanowire modified graphitic carbon nanofibers, have been designed as potential alternatives to platinum counter electrodes in optoelectronic devices. Through energetic plasma ion implantation, these materials exhibit similar redox activity to platinum electrodes, showing low charge-transfer resistance and high capacitance. The resulting photoelectrochemical solar cells demonstrate good stability and high efficiency, indicating potential applications in various solar devices and energy conversion technologies.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Shuyu Cui, Jun Tang, Bihua Hu, Peizhi Wang, Jiaxin Guo, Yuanjun Peng, Xingzhu Wang, Baomin Xu
Summary: This study presents the in-situ fabrication of an H2SO4-Ti3C2Tx ion-gel for preventing restacking in high-rate micro-supercapacitors. The ion-gel, with an electrolyte as support, has enlarged interlayer spacing for improved ion transport. Additionally, a bilayer structure with dry Ti3C2Tx is designed to enhance electron conduction, resulting in improved capacitance and cycle stability at high scan rates.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Xuan Li, Wenjun Yan, Binbin Fan, Zhongde Wang
Summary: A nanocomposite of Co9S8-Ni9S8 nanodiscs (CNS) grown from polypyrrole hollow nanospheres (PHS) on carbon paper (CP) via unipolar pulse electrodeposition (UPED) technique was designed as a hydrogen evolution reaction (HER) catalyst. The optimized CNS/PHS/CP electrode exhibited favorable catalytic activity with low overpotential, superior stability performance, and high electrochemically active surface area. This work provides new insights for the design of low-cost bimetallic sulfide-based electrocatalysts for high-performance HER in water splitting.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Hui Mao, Jiale Sun, Enhui Bao, Longjun Dai, Chunju Xu, Huiyu Chen
Summary: CuCo2O4/CuO composites with urchin-like and octahedral morphologies were prepared through a hydrothermal reaction and extra annealing conversion. The urchin-like structures exhibited higher capacity than octahedrons, and the urchin-like CuCo2O4/CuO//AC hybrid supercapacitor demonstrated superior performance and cycling stability. These findings suggest that urchin-like CuCo2O4/CuO composites have great potential as high-performance supercapacitors in the future.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Wenyue Li, Xiaoyan Ma, Senyang Song, Bo Shao, Xiaoju Liu, Jiahe Chen
Summary: With the development of wearable diagnostic and therapeutic technology, there is increasing interest in integrated bifunctional electrode materials with supercapacitor and sensing performance. In this study, a hydrangea-like metal-organic framework (Ni/Co-DAP MOF) with porous organic polymer DAP was developed, showing excellent electrochemical performance as a supercapacitor and glucose sensor. The design of DAP as a ligand expands the prospects for energy storage and electrochemical sensing.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Na Li, Dongmei She, Kailun Zhang, Hao-Sen Chen, Wei-Li Song, Shuqiang Jiao
Summary: Rechargeable aluminum-ion batteries have gained attention for their potential as next-generation energy storage devices. However, the issues of dendrite growth and corrosion on the surface of aluminum metal electrodes have been overlooked. This study establishes a qualitative relationship between kinetic parameters and surface evolution behavior, explores the electrochemical mechanism, and provides guidance for the optimization design of aluminum-ion batteries.
Article
Chemistry, Physical
Runming Tao, Bryan Steinhoff, Conrad H. Sawicki, Jaswinder Sharma, Kahla Sardo, Amer Bishtawi, Tillman Gibbs, Jianlin Li
Summary: Dry processing of lithium-ion battery electrodes is considered a promising strategy for manufacturing, but little is known about the impact of dry mixing. This study monitors the degree of dry mixing using dry mixing time and prepares a series of dry-processed electrodes with different degrees of dry mixing. It reveals that the degree of dry mixing significantly affects the morphology, homogeneity of electrode components, and PTFE fiberization, leading to variations in the mechanical strength and electrochemical performance of dry-processed electrodes. It is suggested that a moderate degree of dry mixing is preferred for high-performance dry-processed lithium-ion battery electrodes.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Multidisciplinary
Hieu Quang Pham, Minh Tri Nguyen, Mohamed Tarik, Mario El Kazzi, Sigita Trabesinger
Summary: Control of electrode-electrolyte interfacial reactivity at high voltage is crucial for obtaining high-energy-density lithium-ion batteries. The addition of 2-aminoethyldiphenyl borate (AEDB) as an electrolyte additive has been shown to effectively stabilize both cathode and anode materials, leading to improved overall performance of the battery. The study emphasizes the importance of full-cell testing and demonstrates the significant impact of AEDB on enhancing battery performance.
Article
Chemistry, Inorganic & Nuclear
Noriyuki Sonoyama, Kaori Niki, Akihiro Koide, Mina Eguchi, Yoshitaka Ogasawara, Tetsuya Tsukada, Patrick K. Dedetemo
Summary: A nanometer sized solid solution of NiO and Al2O3 was synthesized through calcination of Ni-Al layered double hydroxides (LDHs). The resulting compound showed improved electrochemical properties as an anode material for lithium ion batteries, primarily due to the redox activity of Al3+ ions which increased the capacity in the lower voltage region.
DALTON TRANSACTIONS
(2021)
Article
Nanoscience & Nanotechnology
Alan J. Ardell
Summary: This study re-examines the kinetics of γ' precipitates in binary Ni-Al alloys. It was found that a previous investigation had made an unfortunate error in unit conversion, rendering all conclusions unreliable. The re-analysis shows that the equations describing skeletal coarsening kinetics are not trustworthy in providing useful quantitative information on the coarsening of non-skeletal microstructures and the elastic energy of γ' precipitates with misfit.
SCRIPTA MATERIALIA
(2022)
Article
Electrochemistry
Aaron Liu, Ning Zhang, Jamie E. Stark, Phillip Arab, Hongyang Li, J. R. Dahn
Summary: This study investigates the synthesis of Co-free single crystalline Mg-doped LNO via a one-step lithiation method, with results indicating that increasing the Li/TM ratio at lower temperatures does not affect grain growth but impacts the formation of Li2O impurity. While single crystalline materials still lag behind polycrystalline materials in cycling performance, controlling the Ni content can result in larger grains in the material.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Electrochemistry
Aaron Liu, Ning Zhang, Jamie E. Stark, Phillip Arab, Hongyang Li, J. R. Dahn
Summary: Increasing Ni content in Ni-rich layered positive electrode material improves energy density but reduces cell lifetimes. Single crystalline materials can enhance cell lifetimes by decreasing material degradation. Further research is needed to improve the competitiveness of Mg-containing single crystal materials compared to their polycrystalline counterparts.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Electrochemistry
Nutthaphon Phattharasupakun, Marc M. E. Cormier, Erin Lyle, Eniko Zsoldos, Aaron Liu, Chenxi Geng, Yulong Liu, Hongyang Li, Montree Sawangphruk, J. R. Dahn
Summary: The study found that the amount of Ni in the Li layer significantly affects the diffusion coefficient of Li in Li-deficient LNO materials, with higher Ni content leading to poorer kinetic properties.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Electrochemistry
Aaron Liu, Nutthaphon Phattharasupakun, Marc M. E. Cormier, Eniko Zsoldos, Ning Zhang, Erin Lyle, Phillip Arab, Montree Sawangphruk, J. R. Dahn
Summary: With research pushing for higher nickel content in positive electrode materials, the impacts of various material parameters on electrochemical performances, specifically the kinetic hindrances to lithium diffusion, have been highlighted. The study found that increasing substituents, particle sizes, and optimizing material morphology can decrease capacity and increase irreversible capacity. Cycling at higher temperatures or to a lower cut-off voltage can help recover capacity in certain voltage regions. Additionally, the study shows that lattice diffusion is much slower compared to grain boundary diffusion, providing insight for material morphology optimization for better rate performance.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Electrochemistry
Nutthaphon Phattharasupakun, Marc M. E. Cormier, Yulong Liu, Chenxi Geng, Eniko Zsoldos, Ines Hamam, Aaron Liu, Michel B. Johnson, Montree Sawangphruk, J. R. Dahn
Summary: The research demonstrated that Li-ion kinetics can be enhanced by reducing the Ni atom content in the Li layer, and reducing cation mixing can be achieved by increasing excess Li content or heating temperature. Additionally, grain boundary diffusion plays a crucial role in these materials.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Electrochemistry
Aaron Liu, Nutthaphon Phattharasupakun, Ronald Vali, Dongxu Ouyang, J. R. Dahn
Summary: Various Ni-rich Li-y[Ni1-xMnx]O-2 materials were synthesized in different environments to study the loss and absorption of Li during synthesis. It was found that synthesis in oxygen increased the lithium content in the materials.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Electrochemistry
Ronald Vali, Stuart Aftanas, A. Eldesoky, Aaron Liu, Tina Taskovic, Jessie E. Harlow, Jack deGooyer, Nutthaphon Phattharasupakun, Dongxu Ouyang, Divya Rathore, Marc M. E. Cormier, Michel B. Johnson, HongNam Nguyen, HunHo Kwak, Shinichi Kumakura, Jens Paulsen, J. R. Dahn
Summary: In this study, the performance of commercial pouch cells with Li1.11Ni0.34Mn0.53Al0.02O2/graphite (LNMA) and Li1.167Ni0.183Mn0.558Co0.092O2/graphite (LNMC) electrodes was evaluated under different cycling conditions. The best performing electrolyte for high voltage LNMA cells was Control + 2% fluoroethylene carbonate + 1% lithium difluorophosphate + 1% lithium difluoro(oxalato)borate, retaining 87% capacity after 720 cycles. LNMA cells cycled to 4.25 V and LNMC cells cycled to 4.44 V at 40 degrees C could cycle for 1000 cycles with 80% capacity retention.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Electrochemistry
Eniko Zsoldos, Marc M. E. Cormier, Nutthaphon Phattharasupakun, Aaron Liu, J. R. Dahn
Summary: A systematic investigation was conducted on the factors affecting lithium diffusion coefficient measurements in the Atlung Method for Intercalant Diffusion (AMID). It was found that electrode mass loading, separator thickness, electrolyte solvent choice and salt molarity, voltage interval sizes, open circuit relaxation time, C-rate choice, and charge vs discharge direction all have an impact on the measured material diffusivity. A low electrode loading cell design was proposed to minimize resistance contributions and achieve true lithium diffusivity measurements. AMID results were compared to Galvanostatic Intermittent Titration.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Electrochemistry
Ines Hamam, Ning Zhang, Aaron Liu, M. B. Johnson, J. R. Dahn
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2020)
Article
Electrochemistry
Nutthaphon Phattharasupakun, Chenxi Geng, Michel B. Johnson, Ronald Vali, Aaron Liu, Yulong Liu, Montree Sawangphruk, J. R. Dahn
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2020)
Article
Electrochemistry
Aaron Liu, Ning Zhang, Hongyang Li, Julie Inglis, Yiqiao Wang, Shuo Yin, Haohan Wu, J. R. Dahn
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2019)
Article
Electrochemistry
Marc M. E. Cormier, Ning Zhang, Aaron Liu, Hongyang Li, Julie Inglis, J. R. Dahn
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2019)
Article
Engineering, Chemical
Aaron Liu, J. R. Dahn
Article
Electrochemistry
Ning Zhang, Jamie Stark, Hongyang Li, Aaron Liu, Ying Li, Ines Hamam, J. R. Dahn
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2020)