Article
Chemistry, Multidisciplinary
Jeongin Lee, Min-Ho Kim, Hosik Lee, Jonghak Kim, Jeongwoo Seo, Hyun-Wook Lee, Chihyun Hwang, Hyun-Kon Song
Summary: In this study, a Li-rich layered oxide was successfully rescued by using an organic superoxide dismutase mimics as a homogeneous electrolyte additive, improving the structural instability and interfacial stability of the cathode.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Yuhuan Zhou, Hongfu Cui, Bao Qiu, Yuanhua Xia, Chong Yin, Liyang Wan, Zhepu Shi, Zhaoping Liu
Summary: In this study, it was found that sufficient oxygen redox can suppress voltage decay and improve structural stability. The concentration of disordered structures can be controlled by temperature, revealing the mechanism of structural stability.
ACS MATERIALS LETTERS
(2021)
Article
Chemistry, Physical
Yanfang Wang, Yingzhi Li, Zhiqiang Li, Ning Qin, Feng Wu, Joshua W. Makepeace, Fucai Zhang, Phoebe K. Allan, Zhouguang Lu
Summary: This study demonstrates the potential of using in situ Raman spectroscopy to decipher the local environment changes around oxygen in lithium-rich cathode materials. A Raman band, which can indicate the degree of oxygen oxidation, has been discovered.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Xiaohui Wen, Bao Qiu, Han Gao, Xiao Li, Zhepu Shi, Zhaoping Liu
Summary: This study investigates the regulation of Ni2+ content and the introduction of trivalent Mn3+ to develop a higher available capacity from the Li2MnO3 component. Increasing Ni2+ content improves capacity property and electrochemical stability, while introducing Mn3+ helps to optimize the local structure. The optimized sample exhibits an available discharge capacity of over 280 mAh g(-1) after several cycles.
ACS APPLIED ENERGY MATERIALS
(2022)
Review
Electrochemistry
Tumiso E. Mabokela, Assumpta C. Nwanya, Miranda M. Ndipingwi, Sinethemba Kaba, Precious Ekwere, Shane T. Werry, Chinwe O. Ikpo, Kwena D. Modibane, Emmanuel I. Iwuoha
Summary: This article discusses various advances in addressing the drawbacks of LRMO, improving their performance in battery applications. It further explores surface modification techniques and the future development prospects.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Xiaohui Wen, Chong Yin, Bao Qiu, Liyang Wan, Yuhuan Zhou, Zhining Wei, Zhepu Shi, Xing Huang, Qingwen Gu, Zhaoping Liu
Summary: This study proposes a strategy to alleviate the segregation of Li2MnO3 component in Co-free Li-rich layered cathodes by tailoring oxygen partial pressure during heat treatment. Experimental results show that this strategy can accelerate the activation of Li2MnO3 component and improve the capacity and cycling stability of the material.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Multidisciplinary
Shuang Li, Yipeng Sun, Ning Li, Wei Tong, Xueliang Sun, Charles T. Black, Sooyeon Hwang
Summary: In this study, two different types of porous structures in high-voltage lithium, manganese-rich layered cathodes are revealed, along with the significance of the interface between the cathode and electrolyte in solid-state batteries. Nanopores are found near the interface, while nanovoids are formed during in situ Li+ extraction. Despite the development of nanovoids, the layered structure is preserved.
Article
Chemistry, Multidisciplinary
Satoshi Hiroi, Masatsugu Oishi, Koji Ohara, Keiji Shimoda, Daiki Kabutan, Yoshiharu Uchimoto
Summary: Intensive research is being conducted to enhance the performance of lithium-ion batteries. Li-rich layered oxides (LLO) are attracting attention due to their higher capacity, which is attributed to the unique structural features resulting from cation mixing. Understanding these features will provide guidance for the design of next-generation lithium-ion battery positive electrodes.
Article
Engineering, Environmental
Seonghun Jeong, Kwonyoung Choi, Van-Chuong Ho, Jiung Cho, Jong-Seong Bae, Sang Cheol Nam, Taeeun Yim, Junyoung Mun
Summary: The surface instability of Ni3+ in Ni-rich layered oxide cathode materials is a challenge for high-energy-density lithium-ion batteries. In this study, a Li2MnO3 coating is applied to enable Ni doping on the surface. The results show that tailoring the interface to consume the surface NiO is critical for reducing surface resistance and achieving a high cycle life and rate capability.
CHEMICAL ENGINEERING JOURNAL
(2022)
Editorial Material
Energy & Fuels
Michael M. Thackeray, Khalil Amine
Summary: Lithium-nickel-manganese-cobalt oxides are increasingly the preferred cathode type in automobile batteries due to their superior energy density compared to other types of electrodes.
Review
Chemistry, Multidisciplinary
Wei Zhong, Ziqi Zeng, Shijie Cheng, Jia Xie
Summary: Prelithiation technology is one of the most effective methods to compensate for the loss of active lithium. This review analyzes the factors inducing lithium loss and investigates the mechanisms and effects of prelithiation. The emerging advanced prelithiation technologies and key issues are systematically summarized. Hybrid replenishment and lithium storage technologies are proposed to provide a reference for developing prelithiation technology.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Lian-Bang Wang, He-Shan Hu, Wei Lin, Qing-Hong Xu, Jia-Dong Gong, Wen-Kui Chai, Chao-Qi Shen
Summary: Lithium-rich manganese oxide nanocomposites with high electrochemical performance and cycling stability were successfully designed through a dynamic hydrothermal route, utilizing intense hydrothermal conditions and stirring to produce nanoparticles with large surface area and uniform dispersity. The incorporation of Li2MnO3 phase in appropriate proportions was found to be crucial in maintaining high capacity and structural stability in the composite material.
Article
Chemistry, Multidisciplinary
Youri Wei, Jun Cheng, Deping Li, Yuanyuan Li, Zhen Zeng, Hongbin Liu, Hongqiang Zhang, Fengjun Ji, Ximing Geng, Jingyu Lu, Lijie Ci
Summary: This study proposes an innovative electrochemical lithium supplement strategy to inhibit the structure collapse and enhance the cycling stability of Lithium-rich manganese-based cathodes. Combining with the superior Li-ion conductor LLZAO, remarkable rate capability is achieved. The excess lithium ions in LLZAO mitigate the spinel-like phase transformation and stabilize the cathode structure. The research findings provide a new pathway for stabilizing LLMO structures.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Xiaoyang Deng, Mi Li, Zizai Ma, Xiaoguang Wang
Summary: In this study, a perovskite-like La2Li0.5Co0.5O4 (LLCO) material was selected as a protective surface to stabilize the Li1.2Mn0.54Ni0.13Co0.13O2 (LR) substrate through wet chemical coating method, effectively addressing the fast voltage/capacity decay of LR cathodes. LLCO can reduce oxygen evolution and enhance structure stability, while also preventing electrolyte corrosion and increasing the mechanical strength of cathode materials. Furthermore, the coated LLCO with high electronic/ionic conductivity significantly improves energy storage kinetics and rate performance of the batteries.
Article
Chemistry, Physical
Sojung Koo, Jaewoon Lee, Jinwoo Lee, Sangho Yoon, Duho Kim
Summary: This study explores the role of Mn(t2g3)-O hybridized band in activating oxygen redox reactions and suppressing O2 release. The presence of this band is crucial for easily triggering ORRs and inhibiting the formation of very short O-O dimers, providing a new direction for designing high energy density cathodes in lithium-ion batteries.
ENERGY STORAGE MATERIALS
(2021)
Article
Crystallography
Indrajit Saha, Ken Kanazawa, Hiroaki Nitani, Shinji Kuroda
Summary: This study investigates the effect of growth conditions on the structural and magnetic properties of (Zn,Fe)Te thin films. The analysis reveals that films grown under Zn-rich conditions exhibit significant differences in structure and magnetism compared to those grown under Te-rich conditions.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Chemistry, Physical
Guowei Zhao, Kota Suzuki, Toyoki Okumura, Tomonari Takeuchi, Masaaki Hirayama, Ryoji Kanno
Summary: In this study, lithium superionic conductors with gamma-Li3PO4-type structures were developed to investigate the multicomponent effects on ion-conducting properties. The results showed that framework cations with larger ionic radii exhibited enhanced conductive properties, and the changes in ionic conductivity associated with the ionic radius were larger in ternary systems than those in binary systems.
CHEMISTRY OF MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Naoyoshi Murata, Takuya Suzuki, Yunli Lin, Hiroaki Nitani, Yasuhiro Niwa, Takahiro Wada, Motohiro Uo, Kiyotaka Asakura
Summary: A battery-driven micro electromechanical system (MEMS) gas sensor has been developed for household safety when using natural gas. The sensor shows excellent sensitivity to methane and maintains stability under reaction conditions, ensuring a long lifetime.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Dai Inoue, Toshiki Komatsu, Hideharu Niwa, Hiroaki Nitani, Hitoshi Abe, Yutaka Moritomo
Summary: This systematic study investigates the local structure of Fe2+ and Fe3+ in 11 solvents using EXAFS and XANES. The results show that both Fe2+ and Fe3+ are coordinated by six oxygen atoms of the ligand molecules, forming a FeL (6)-type complex in all solvents. XANES reveals noncentrosymmetric deformation of the [FeL (6)](3+) complex in several solvents. In protic solvents, the coordination number (n (C)) of the second nearest carbon around Fe3+ significantly depends on the ligand L.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
Dai Inoue, Toshiki Komatsu, Hideharu Niwa, Toshiaki Ina, Hiroaki Nitani, Hitoshi Abe, Yutaka Moritomo
Summary: In this study, the coordination states of Fe2+ and Fe3+ in organic solvents were investigated using spectroscopic techniques. The results showed that Fe3+ formed [FeCl4](-) complex in all the solutions, while Fe2+ formed different coordination structures in different solvents.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Chemistry, Multidisciplinary
Jianjun Li, Wenhan Chen, Haolin Wang, Lili Guo, Nuowei Zhang, Jinbao Zheng, Jile Fu, Hiroaki Nitani, Binghui Chen
Summary: An effective method is proposed for synthesizing a hierarchical Co-doped AlPO4 molecular sieve, CoAIP-CTAB, with both framework and extra framework Co identified by XAFS. The obtained nanocrystals show high catalytic activity and stability in the conversion of n-butenes to isobutene, without the need for gas dilution, due to their hierarchical structure and abundant Co sites in the framework. This novel synthesis strategy may inspire the design of similar zeolite catalysts for selective reactions in the industry.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Electrochemistry
Takumi Hasegawa, Fan Bai, Daisuke Mori, Sou Taminato, Yasuo Takeda, Osamu Yamamoto, Hiroaki Izumi, Hironari Minami, Nobuyuki Imanishi
Summary: In this study, a composite separator consisting of Kimwipe paper and porous polyethylene was successfully used to suppress lithium dendrite formation and growth, providing a new solution for the practical application of lithium metal as a battery anode.
Article
Chemistry, Multidisciplinary
Rebecca Scatena, Ran Liu, Vladimir V. Shvartsman, Dmitry D. Khalyavin, Yoshiyuki Inaguma, Kazunari Yamaura, Alexei A. Belik, Roger D. Johnson
Summary: We demonstrate a polar phase in the columnar perovskite (NaY)MnMnTi4O12, resulting from cation ordering on A site columns, which are oppositely displaced through coupling to B site octahedral tilts. This ordering, controlled by annealing temperature, also polarizes the local dipoles associated with pseudo-Jahn-Teller active Mn2+ ions, generating an additional ferroelectric order. Below T-N approximately 12 K, Mn2+ spins order, making this system rare in having ordered electric and magnetic dipoles on the same transition metal sublattice.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Hiroshi Okuda, Kohei Kintsu, Shu Kurokawa, Masao Tabuchi, Hiroaki Nitani, Hajime Kimizuka, Shin-ichi Inoue, Michiaki Yamasaki, Yoshihito Kawamura
Summary: A coarse-grained picture of segregation layers in MgYZn alloys has been confirmed, where the layers are two-dimensional cluster systems bound in stacking faults. The use of EXAFS, small-angle X-ray scattering, and scanning tunneling microscopy showed that the atomic configurations around Y and Zn atoms in the segregation layers are identical, indicating the presence of L12 clusters. This fingerprint was observed in both bulk LPSO structures and dilute MgYZn alloys.
Article
Chemistry, Physical
Yoshiyuki Inaguma, Akihisa Aimi, Takahiro Ao, Yosuke Hamasaki, Daisuke Mori, Koichiro Ueda, Minoru Ikeda, Takahisa Ohno, Kazutaka Mitsuishi
Summary: We synthesized polycrystalline perovskite-type Li-ion-conducting oxides and evaluated their crystal structure, microstructure, ionic conductivity, and electrochemical stability. The compound with the composition Sr0.458Li0.384Ti0.3Ta0.7O3 exhibited the highest bulk and total ionic conductivity, which were higher than those of the reference material LLTO. First-principles calculations showed that the distortion of BO6 octahedra and the second-order Jahn-Teller effect facilitated the diffusion of Li ions. A solid-state Li-ion battery using Sr0.458Li0.384Ti0.3Ta0.7O3 as the electrolyte showed promising performance.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Hiroshi Takashima, Yoshiyuki Inaguma, Masayoshi Nagao, Katsuhisa Murakami
Summary: We successfully obtained BaSnO3 perovskite thin films with remarkable near-infrared luminescence by van der Waals growth. The films were grown on quartz glass substrates using hexagonal boron nitride as the seed layer, and their crystallinity was confirmed by X-ray diffraction and transmission electron microscopy. The grown film exhibited a broad near-infrared emission peak centered at 920 nm. The transparent BaSnO3 film, with high transparency and remarkable near-infrared emission, obtained through van der Waals-type growth, can be applied in wavelength conversion devices to improve the efficiency of Si single-crystal solar cells. The hexagonal boron nitride seed layer is an effective method for high-quality crystal growth of perovskite-type oxides with various functionalities.
Article
Chemistry, Physical
Yuta Kimura, Su Huang, Takashi Nakamura, Nozomu Ishiguro, Oki Sekizawa, Kiyofumi Nitta, Tomoya Uruga, Tomonari Takeuchi, Toyoki Okumura, Mizuki Tada, Yoshiharu Uchimoto, Koji Amezawa
Summary: A method combining operando computed tomography and X-ray absorption near-edge structure spectroscopy (CT-XANES) is proposed in this paper to directly track the evolution of the 3D distribution of local capacity loss in battery electrodes. The method enables a five-dimensional analysis of degradation, including spatial coordinates, time, and chemical state. It quantifies the spatiotemporal dynamics of local capacity degradation and correlates it with overall electrode performance, providing critical insights for identifying degradation factors and developing batteries with long-term stability.
Article
Chemistry, Multidisciplinary
Tomohiro Kakimi, Shuntaro Miyakawa, Sou Taminato, Takaya Saito, Daisuke Mori, Nobuyuki Imanishi
Summary: Coating the surface of a copper electrode with an Al2O3 thin film improves the deposition and dissolution behavior of lithium metal anodes, reducing dendrite growth and enhancing the safety and cycling performance of batteries.
Article
Chemistry, Physical
Ryusuke Mizuochi, Kengo Oka, Yoshiyuki Inaguma, Kazuhiko Maeda
Summary: A two-dimensional perovskite oxyfluoride electrode, Pb3Fe2O5F2, exhibited high activity for electrochemical oxidation of water, with almost unity faradaic efficiency and a significantly lower oxidation potential compared to the 3D bulk analogue PbFeO2F prepared in a similar manner.
SUSTAINABLE ENERGY & FUELS
(2022)
