Article
Chemistry, Multidisciplinary
Xiaoxia Yang, Suning Wang, Duzhao Han, Kai Wang, Akhil Tayal, Volodymyr Baran, Alexander Missyul, Qiang Fu, Jiangxuan Song, Helmut Ehrenberg, Sylvio Indris, Weibo Hua
Summary: A Co-free single-crystalline LMLO with small lattice changes and reduced micro-strain was synthesized, demonstrating potential for constructing stable high-energy lithium-ion batteries.
Article
Chemistry, Applied
Jie Feng, Yun-Shan Jiang, Fu-Da Yu, Wang Ke, Lan-Fang Que, Jenq-Gong Duh, Zhen-Bo Wang
Summary: The study demonstrates that regulating the Li component in Li-rich materials can improve their cycle stability and suppress voltage fading trends. Insufficient Li leads to incomplete replacement, residual Na hinders Li+ diffusion, and excessive Li results in Mn valence reduction and severe Jahn-Teller effect.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Physical
Yafen Chen, Yanchen Liu, Jingchao Zhang, He Zhu, Yang Ren, Wei Wang, Qi Zhang, Yang Zhang, Qunhui Yuan, Guo-Xing Chen, Leighanne C. Gallington, Kaikai Li, Xingjun Liu, Junwei Wu, Qi Liu, Yanan Chen
Summary: A new type of lithium-rich layered oxide with an O2/O3 hybrid structure has been designed, showing greatly improved voltage and capacity stability compared to pure O2 and O3-type LLOs. This novel approach has opened up a new way to reduce capacity and voltage decay in LLOs, promising for the development of high-energy-density LIBs.
ENERGY STORAGE MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Xin Cao, Jianming Sun, Zhi Chang, Pengfei Wang, Xiyan Yue, Jun Okagaki, Ping He, Eunjoo Yoo, Haoshen Zhou
Summary: In this study, a Co/Ni-free biphasic O2/O3-type layered cathode material Li-0.9[Li0.3Mn0.7]O-2 is proposed and characterized. The biphasic cathode demonstrates high discharge capacity and long-term cycle stability.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Hui Liu, Chao Li, Wei Tong, Bingwen Hu
Summary: A novel O2-phase Li1.033Ni0.2[square Mn-0.1(0.5)]O-2 cathode with native vacancies was designed, enabling reversible structural transformation without the formation of Li in the Li layer. The migration of in-plane Mn is effectively mitigated, preventing the generation of trapped O-2 molecules. The cycle stability of Li1.033Ni0.2[square Mn-0.1(0.5)]O-2 is significantly enhanced, showing extraordinary capacity retention of 102.31% after 50 cycles at a rate of 0.1C.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Tianquan Liang, Weitian Zeng, Liu Yang, Siyun Liu, Youxia Huang, Huan He, Xiyong Chen, Aoping He
Summary: The electrochemical performance of the Fe3+ doped Li1.2Mn0.54Ni0.13Co0.13O2 cathode material was investigated, showing excellent cycling stability and capacity retention. The Fe3+ doping improved the lithium layer spacing, reduced charge-transfer resistance, accelerated Li+ diffusion, and mitigated the irreversible loss of lattice oxygen and Mn dissolution during cycling.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Applied
Zisheng Liu, Ning Zhao, Xiaohui Zhao, Chenggong Wang, Tao Zhang, Sheng Xu, Xiangxin Guo
Summary: Li-O-2 batteries based on the conversion reaction of oxygen cathodes can deliver high specific capacity. Combining Li-rich layered-oxide cathodes with oxygen cathodes improves cell performance and extends cycle life.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Jimin Lee, Sanghyuk Park, Seongdeock Jeong, Jangho Park, Wooseok Kim, Gyeongbin Ko, Kwangho Park, Hong-In Kim, Kyungjung Kwon
Summary: Saline discharge is a crucial step to prevent explosion risks in spent Li-ion batteries. The impact of residual NaCl impurities from saline discharge on the structural and electrochemical properties of resynthesized cathode materials needs to be examined.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Baodan Zhang, Yiming Zhang, Haichuan Wu, Linhui Zeng, Xiaotong Wang, Hui Liu, Xiaohong Wu, Jianken Chen, Haitang Zhang, Yawen Yan, Yonglin Tang, Huan Huang, Lirong Zheng, Qiaobao Zhang, Qingshui Xie, Dong-Liang Peng, Chao Li, Yu Qiao, Shi-Gang Sun
Summary: Although the synthesis technology of popular single-crystal electrode materials is mature, it is rare to find large and highly dispersed Li-rich single-crystal cathodes. In this study, micro-sized single-crystal Mn-Li-rich particles with extreme dispersity were achieved by adjusting Li content and high temperature residence time. However, the modified parameters during the sintering process intensified the Li/Ni mixing, leading to dynamical hysteresis and structural damage. Moreover, the long-range diffusion pathway in single-crystal Li-rich grains limits Li+ transfer and weakens anionic redox kinetics.
ENERGY STORAGE MATERIALS
(2023)
Article
Chemistry, Physical
Weibo Hua, Suning Wang, Kai Wang, Alexander Missyul, Qiang Fu, Mariyam Susana Dewi Darma, Hang Li, Volodymyr Baran, Laijun Liu, Christian Kuebel, Joachim R. Binder, Michael Knapp, Helmut Ehrenberg, Sylvio Indris
Summary: Investigated an ion-exchange reaction between layered oxides and carbonate electrolyte at room temperature, resulting in novel cathode materials for lithium-ion batteries with good electrochemical performance for lithium ion accommodation.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Shun Li, Yifei Liu, Jianhui Zhu, Yanlong Wang, Jian Jiang, Chang Ming Li
Summary: Both Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) and Li-rich Li1.2Mn0.54Co0.13Ni0.13O2 (LLO) cathodes can benefit from a 4 nm silica coating, which improves their long-term cyclability, rate capabilities, and voltage sustainability. This conformal silica coating enhances the mechanical and chemical properties of the cathodes, providing a useful technique for regulating cathode kinetics.
ACS APPLIED ENERGY MATERIALS
(2021)
Review
Chemistry, Physical
Xin Cao, Yu Qiao, Min Jia, Ping He, Haoshen Zhou
Summary: This study reviews the potential application of Li-rich and Li-excess oxides as cathode materials for next-generation Li-ion batteries, discusses the challenges in using Li-excess oxides, and explores mechanisms to address these issues. Future research directions in the field are also proposed based on advanced characterizations and theory calculations.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Jinyang Dong, Feng Wu, Jiayu Zhao, Qi Shi, Yun Lu, Ning Li, Duanyun Cao, Wenbo Li, Jianan Hao, Xulai Yang, Lai Chen, Yuefeng Su
Summary: Through the design of an amine-functionalized mesoporous molecular sieve additive with active oxygen/water scavenging capability, a multifunctional self-reconstructive CEI layer with modified mechanical/electrochemical stability was constructed, resolving the issues induced by collaboration failure mechanism between manganese-based oxide and electrolyte in lithium-ion batteries. This design provides new insights into achieving a high-stability and high-energy-density lithium-ion battery system.
ENERGY STORAGE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hsiu-Fen Lin, Si-Ting Cheng, De-Zhen Chen, Nian-Ying Wu, Zong-Xiao Jiang, Chun-Ting Chang
Summary: In this study, a new nanolayer coating material, LiCoMnO4, was proposed to modify the surface of lithium cathode oxide. The designed cathode with nanolayer spinel coating exhibited excellent electrochemical performance, including reversible capacity, rate capability, and cycling ability.
Article
Nanoscience & Nanotechnology
Qun Liu, Te Xie, Qingshui Xie, Wei He, Yinggan Zhang, Hongfei Zheng, Xiangjun Lu, Wensheng Wei, Baisheng Sa, Laisen Wang, Dong-Liang Peng
Summary: A multiscale deficiency integration is realized in a Li-rich manganese-based cathode material through Na-rich engineering, significantly improving the electrochemical properties of the electrode materials. It enhances capacity retention, voltage retention, and energy density maintenance of the cathode material.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Multidisciplinary Sciences
Hiroki Ubukata, Fumitaka Takeiri, Kazuki Shitara, Cedric Tassel, Takashi Saito, Takashi Kamiyama, Thibault Broux, Akihide Kuwabara, Genki Kobayashi, Hiroshi Kageyama
Summary: The introduction of chemical disorder by substitutional chemistry into ionic conductors is a common strategy to stabilize high-symmetric phases while maintaining ionic conductivity at lower temperatures. Hydride materials, especially Ba2-delta H3-2 delta X, show promising ionic conductivity below 300 degrees C, opening new directions in electrochemical use of hydrogen. The layered anion order in these materials, along with Schottky defects, helps suppress structural transitions and retain a highly symmetric lattice.
Review
Chemistry, Multidisciplinary
Kazuhiko Maeda, Fumitaka Takeiri, Genki Kobayashi, Satoru Matsuishi, Hiraku Ogino, Shintaro Ida, Takao Mori, Yoshiharu Uchimoto, Setsuhisa Tanabe, Tetsuya Hasegawa, Nobuhito Imanaka, Hiroshi Kageyama
Summary: This Account describes the recent progress in the development of new mixed-anion compounds by the MEXT mixed-anion project, focusing on the results related to the development of materials used as photocatalysts/photoelectrodes, phosphors, secondary battery components, conductors, and thermoelectric materials.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2022)
Article
Chemistry, Physical
Fumitaka Takeiri, Akihiro Watanabe, Kei Okamoto, Dominic Bresser, Sandrine Lyonnard, Bernhard Frick, Asad Ali, Yumiko Imai, Masako Nishikawa, Masao Yonemura, Takashi Saito, Kazutaka Ikeda, Toshiya Otomo, Takashi Kamiyama, Ryoji Kanno, Genki Kobayashi
Summary: Hydrogen transport in solids is crucial for sustainable energy societies. Practical hydrogen conductivity at intermediate temperatures remains a challenge. A K2NiF4-type Ba-Li oxyhydride is shown to exhibit temperature-independent hydrogen conductivity, which is important for energy and chemical conversion devices.
Article
Chemistry, Physical
Shun Dekura, Yoshiya Sunairi, Kei Okamoto, Fumitaka Takeiri, Genki Kobayashi, Yuta Hori, Yasuteru Shigeta, Hatsumi Mori
Summary: This study investigated the effects of mechanical grinding on the phase behavior and anhydrous proton conductivity of a single-crystalline material. The results showed that grinding suppressed the structural transition and significantly enhanced the proton conductivity of the material. The findings suggest the potential for improving the performance of anhydrous organic proton conductors through simple mechanical grinding.
SOLID STATE IONICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Harry W. T. Morgan, Takafumi Yamamoto, Takumi Nishikubo, Takuya Ohmi, Takehiro Koike, Yuki Sakai, Masaki Azuma, Hirofumi Ishii, Genki Kobayashi, John E. McGrady
Summary: This study presents a detailed investigation into the influence of pressure on the mixed-anion oxyhydride phase Ba2YHO3, which exhibits hydride conductivity. It is found that pressure induces two sequential structural transitions in the interlayer regions. Experimental observation and theoretical calculations provide insights into the structural impact of pressure.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Hiroki Ubukata, Fumitaka Takeiri, Cedric Tassel, Shintaro Kobayashi, Shogo Kawaguchi, Takashi Saito, Takashi Kamiyama, Shunsuke Kobayashi, Genki Kobayashi, Hiroshi Kageyama
Summary: According to the Hume-Rothery rule, anions with a large difference in ionic radii cannot form solid solutions. However, this study demonstrates that Ba2H3X (X = CI, Br, or I) with a special structure can form trihalide solid solutions containing substantial amounts of each halogen. The analysis of synchrotron X-ray diffraction data reveals a significant deviation of the local structure from the average structural model for the solid solutions, which is mainly attributed to the different size variances of X- anions. Furthermore, the study shows that size-flexible H- anions play an important role in the formation of trihalide solid solutions.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Hajime Toriumi, Genki Kobayashi, Takashi Saito, Takashi Kamiyama, Takaaki Sakai, Takahiro Nomura, Sho Kitano, Hiroki Habazaki, Yoshitaka Aoki
Summary: This study discovered a highly durable oxyhydride perovskite material with enhanced H- ion-electron mixed conductivity, which has potential applications in mixed conducting electrodes and hydrogen-permeable membrane supports of ceramic electrochemical cells.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Kei Okamoto, Fumitaka Takeiri, Yumiko Imai, Masao Yonemura, Takashi Saito, Kazutaka Ikeda, Toshiya Otomo, Takashi Kamiyama, Genki Kobayashi
Summary: In this study, a Ba-Li-Na-H-O oxyhydride system was synthesized by partially substituting sodium for lithium in BLHO, leading to a significant improvement in conductivity. Our experimental results demonstrate that substituting at least 40% of lithium with sodium can enhance the conductivity of the oxyhydride system.
Article
Chemistry, Multidisciplinary
Yuki Sasahara, Takashi Hirose, Masataka Yoshimoto, Naoki Matsui, Shigeru Kobayashi, Hiroki Ubukata, Fumitaka Takeiri, Kota Suzuki, Masaaki Hirayama, Kazunori Nishio, Ryota Shimizu, Ryoji Kanno, Genki Kobayashi, Taro Hitosugi
Summary: We report the formation of La2LiHO3 epitaxial thin films and the high H- conductivities in the ab-planes of the crystals. The H- conductivity in the ab-plane of La2LiHO3 thin films is found to be significantly higher than that of bulk polycrystals, and the activation energy is lower. The results also suggest that the H- conductivities of bulk polycrystals can be enhanced by controlling the properties of the grains and aligning the orientations of the crystallites.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Physical
Yoshiki Izumi, Fumitaka Takeiri, Kei Okamoto, Takashi Saito, Takashi Kamiyama, Akihide Kuwabara, Genki Kobayashi
Summary: Hydride ion conductors, especially the fluorite-type LaH3-delta series, have shown high conductivity around room temperature. However, their non-stoichiometric nature poses challenges for their use as solid electrolytes. In this study, Sr-substituted LaH3-delta with slight O2- incorporation was synthesized, demonstrating H- conductivity at room temperature. This achievement is a significant milestone in the development of electrochemical devices that utilize its strong reducing ability.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Nur Ika Puji Ayu, Fumitaka Takeiri, Takafumi Ogawa, Akihide Kuwabara, Masato Hagihala, Takashi Saito, Takashi Kamiyama, Genki Kobayashi
Summary: New solid compounds A(3-x)GaO(4)H(1-y) (A = Sr, Ba 0.15, y SIM;0.3) have been synthesized, which are the first oxyhydrides containing gallium ions. The compounds adopt an anti-perovskite structure consisting of hydride-anion-centered HA(6) octahedra with tetrahedral GaO4 polyanions, showing partial defect in A- and H-sites. The thermodynamic stability and band gap of stoichiometric Ba3GaO4H are supported by formation energy calculations, and annealing Ba powder suggests H- desorption and O2-/H- exchange reactions.
DALTON TRANSACTIONS
(2023)
Proceedings Paper
Physics, Applied
Ugne Miniotaite, Ola Kenji Forslund, Elisabetta Nocerino, Frank Elson, Rasmus Palm, Nami Matsubara, Yuqing Ge, Rustem Khasanov, Genki Kobayashi, Yasmine Sassa, Jonas Weissenrieder, Vladimir Pomjakushin, Daniel Andreica, Jun Sugiyama, Martin Mansson
Summary: In this study, high-pressure mu+SR technique was used to investigate the effects of pressure on the low-temperature magnetic order of LFPO. Contrary to theoretical predictions, it was found that the magnetic ordering temperature and magnetic moment increase under high pressure.
15TH INTERNATIONAL CONFERENCE ON MUON SPIN ROTATION, RELAXATION AND RESONANCE
(2023)
Article
Chemistry, Physical
Kei Okamoto, Fumitaka Takeiri, Yumiko Imai, Masao Yonemura, Takashi Saito, Kazutaka Ikeda, Toshiya Otomo, Takashi Kamiyama, Genki Kobayashi
Summary: In this study, we report the aliovalent partial substitution of Ba with K in Ba-Li oxyhydride, which results in structural phase transitions and high H- conductivity. The phase transition temperatures are lowered by approximately 50 degrees C via 15% K/Ba substitution, leading to a high conductivity at lower temperatures.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Tasuku Uchimura, Fumitaka Takeiri, Kei Okamoto, Takashi Saito, Takashi Kamiyama, Genki Kobayashi
Summary: Barium titanium oxyhydride BaTiO3-xHx is a promising functional material with H-/e(-) mixed conduction, and it was successfully synthesized by a mechanochemical method. The polycrystalline sample obtained can function as a hydrogen permeable electrode.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Physical
Naoki Matsui, Yoyo Hinuma, Yuki Iwasaki, Kota Suzuki, Jiang Guangzhong, Haq Nawaz, Yumiko Imai, Masao Yonemura, Masaaki Hirayama, Genki Kobayashi, Ryoji Kanno
JOURNAL OF MATERIALS CHEMISTRY A
(2020)
