Article
Chemistry, Multidisciplinary
Junxia Meng, Lishuang Xu, Quanxin Ma, Mengqian Yang, Yuzhong Fang, Guangying Wan, Ruhong Li, Jujun Yuan, Xianke Zhang, Huajun Yu, Lingli Liu, Tiefeng Liu
Summary: In this study, a method to design robust Li-rich layered cathode materials for lithium-ion batteries is proposed. The gradient W-doping in LLMO can alleviate crystal disintegration and enhance interfacial stability. The W-doped LLMO exhibits improved capacity and voltage stability, and a practical pouch cell based on the W@LLMO cathode shows sufficient energy density and cycling stability.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Errui Wang, Dongdong Xiao, Tianhao Wu, Xiaosong Liu, Yongning Zhou, Boya Wang, Ting Lin, Xu Zhang, Haijun Yu
Summary: A strategy of synergistic bulk doping of Al and Ti is proposed to enhance the structural stability of Li-rich layered oxides (LLOs) for high-energy cathode materials in Li-ion batteries. The study demonstrates the remarkable electrochemical performance of Al/Ti codoped LLOs, including minor voltage decay and superior capacity retention.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Qin Wang, Meng Yao, Aipeng Zhu, Qian Wang, Hao Wu, Yun Zhang
Summary: A simple surface modification method is designed to solve the performance degradation and structural collapse issues of Li-rich layered oxides (LRLOs). The modified material (LRLO@LMO@LNO) exhibits an ultra-high discharge capacity and very small voltage attenuation, even at high current densities.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Physical
Lu Nie, Shaojie Chen, Wei Liu
Summary: This article introduces the importance of high-voltage cathode materials in lithium-ion batteries and their relationship with lattice structure and electrochemical properties. It also discusses the degradation mechanisms and corresponding modification strategies, highlighting recent progress and strategies such as element doping, surface coating, morphology design, and size control. Finally, a concise perspective for future developments and practical applications of lithium-rich layered oxides has been provided.
Article
Nanoscience & Nanotechnology
Yike Lei, Yuval Elias, Yongkang Han, Dongdong Xiao, Jun Lu, Jie Ni, Yingchuan Zhang, Gunman Zhang, Doron Aurbach, Qiangfeng Xiao
Summary: Coating by oxygen-deficient perovskite La0.9Sr0.1CoO3 can effectively improve the cycling performance and voltage stability of Li-rich Mn-based cathode materials, while reducing gas evolution. The coating has a high oxygen vacancy concentration and forms a uniform coating layer.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Quan Li, Hong Wang, Guan Wang, Fanjie Xia, Weihao Zeng, Haoyang Peng, Ganggang Ma, Anan Guo, Ruifeng Dong, Jinsong Wu
Summary: It is found that trace amount lanthanide element Yb doping can mitigate the structural degradation during cycling of Li-rich layered oxides (LLOs) by forming a surficial Yb-rich layer with high density of oxygen vacancy on the cathodes, and doping into the lattice of LLO to enhance the binding energy with oxygen and stabilize the lattice in grain interior, resulting in significantly improved cycling stability.
Article
Chemistry, Multidisciplinary
Hongfei Zheng, Chenying Zhang, Yinggan Zhang, Liang Lin, Pengfei Liu, Laisen Wang, Qiulong Wei, Jie Lin, Baisheng Sa, Qingshui Xie, Dong-Liang Peng
Summary: The research successfully improved the performance of Li-rich layered cathodes by dual-doping Na+ and F- ions, and regulating Li+/Ni2+ intermixing and Li-O-Li configuration, leading to increased battery capacity and cycle life.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Panawan Vanaphuti, Yangtao Liu, Xiaotu Ma, Jinzhao Fu, Yulin Lin, Jianguo Wen, Zhenzhen Yang, Yan Wang
Summary: The study successfully integrated Na/F co-doping and AlF3 coating on LMR cathode materials to enhance their electrochemical performance and ionic conductivity, while alleviating structural degradation and metal dissolution issues. This represents a new strategy to improve structural homogeneity and moves closer to commercial viability.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Tianhao Wu, Xiang Liu, Xu Zhang, Yue Lu, Boya Wang, Qingsong Deng, Yubo Yang, Errui Wang, Zhongtian Lyu, Yaoqian Li, Yongtao Wang, Yan Lyu, Cunfu He, Yang Ren, Guiliang Xu, Xueliang Sun, Khalil Amine, Haijun Yu
Summary: A new type of lithium-rich layered oxide material was designed in this study, which successfully reduced voltage decay, improved cycle performance, and thermal stability without any material modifications or electrolyte optimizations. The research results demonstrate that the gradient-tailored material can effectively reduce the thermal release of the battery when charged to the maximum voltage.
ADVANCED MATERIALS
(2021)
Article
Multidisciplinary Sciences
Tongchao Liu, Jiajie Liu, Luxi Li, Lei Yu, Jiecheng Diao, Tao Zhou, Shunning Li, Alvin Dai, Wenguang Zhao, Shenyang Xu, Yang Ren, Liguang Wang, Tianpin Wu, Rui Qi, Yinguo Xiao, Jiaxin Zheng, Wonsuk Cha, Ross Harder, Ian Robinson, Jianguo Wen, Jun Lu, Feng Pan, Khalil Amine
Summary: Utilizing Li- and Mn-rich (LMR) cathode materials can increase battery energy density. However, voltage decay issues impede commercialization. In this study, it is revealed that nanostrain and lattice displacement accumulate continuously during operation, leading to structure degradation and oxygen loss, which cause rapid voltage decay. The heterogeneous nature of LMR cathodes results in pernicious phase displacement/strain. Mesostructural design is proposed as a strategy to mitigate lattice displacement and achieve stable voltage and capacity profiles.
Article
Chemistry, Multidisciplinary
Yameng Fan, Emilia Olsson, Gemeng Liang, Zhijie Wang, Anita M. D'Angelo, Bernt Johannessen, Lars Thomsen, Bruce Cowie, Jingxi Li, Fangli Zhang, Yunlong Zhao, Wei Kong Pang, Qiong Cai, Zaiping Guo
Summary: This study investigates the mechanical behavior of cobalt-free Li1.2Ni0.2Mn0.6O2 and demonstrates the positive impact of two-phase Ru doping. The Ru doping improves structural reversibility and restrains structural degradation during cycling, resulting in high structural stability and a high capacity-retention rate during long-term cycling.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Pilgun Oh, Jeongsik Yun, Jae Hong Choi, Gyutae Nam, Seohyeon Park, Tom James Embleton, Moonsu Yoon, Se Hun Joo, Su Hwan Kim, Haeseong Jang, Hyungsub Kim, Min Gyu Kim, Sang Kyu Kwak, Jaephil Cho
Summary: In this study, a secondary doping ion substitution method is proposed to improve the electrochemical reversibility of LCO materials for Li-ion batteries. The utilization of Na ions as functional dopants and Fe-ion substitution improves the capacity retention and cycling stability of LCO. This provides a new avenue for the manufacturing of layered cathode materials with a long cycle life.
ADVANCED ENERGY MATERIALS
(2023)
Review
Engineering, Chemical
Yin Xie, Yongcheng Jin, Lan Xiang
Summary: Lithium rich layered oxides (LLOs) are promising cathode materials for Li-ion batteries with high capacity and suitable voltage, but they face serious voltage and capacity fading issues. This review covers an overview of LLOs' crystal structure, band structure and electrochemical performances, as well as current understanding on oxygen loss, capacity fading and voltage fading, followed by a review of five strategies to mitigate capacity and voltage fading. It is believed that these understandings can help address the fading problems of LLOs.
Article
Chemistry, Multidisciplinary
Dong Luo, Huixian Xie, Fulin Tan, Xiaokai Ding, Jiaxiang Cui, Xiaoyan Xie, Chenyu Liu, Zhan Lin
Summary: This study developed a method to construct a robust surface-integrated structure to improve the capacity and voltage stability of Li-rich layered oxides. Through density functional theory calculations, the impact of different cations on the surface-integrated structure was revealed.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Geon-Tae Park, Dae Ro Yoon, Un-Hyuck Kim, Been Namkoong, Junghwa Lee, Melody M. Wang, Andrew C. Lee, X. Wendy Gu, William C. Chueh, Chong S. Yoon, Yang-Kook Sun
Summary: Limiting the primary particle size of cathodes can effectively address capacity fading issues and improve battery cycling stability. The introduction of Mo helps inhibit primary particle growth, leading to enhanced cycle life for Li[Ni0.95Co0.04Mo0.01]O-2.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Min Huang, Bin Zheng, Tong Cai, Xiaofeng Li, Jian Liu, Chao Qian, Hongsheng Chen
Summary: This article proposes a machine-learning-enabled metasurface for direction of arrival (DOA) estimation. By controlling the metasurface, a series of field intensities can be generated and processed using a pretrained random forest model to accurately estimate the incident angle. Experimental results demonstrate high accuracy for a wide range of incident angles.
Article
Multidisciplinary Sciences
Chao Qian, Zhedong Wang, Haoliang Qian, Tong Cai, Bin Zheng, Xiao Lin, Yichen Shen, Ido Kaminer, Erping Li, Hongsheng Chen
Summary: This paper introduces the concept of neuro-metamaterials, which enable a dynamic entirely-optical object recognition and mirage. The experiments demonstrate that this technology can perceive the postures of rabbits at the speed of light and create dynamic optical mirages using holographic videos.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Jiayi Wang, Rui Xi, Tong Cai, Huan Lu, Rongrong Zhu, Bin Zheng, Hongsheng Chen
Summary: This paper proposes a data cropping algorithm that significantly reduces the simulation time in the DNN pre-training process by cropping simulated data and adding random data. By using this algorithm and a target-driven DNN, a metasurface structure with a low profile and broad transmission characteristics is successfully designed.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Tong Cai, Bin Zheng, Jing Lou, Lian Shen, Yihao Yang, Shiwei Tang, Erping Li, Chao Qian, Hongsheng Chen
Summary: Researchers have successfully developed an ultrabroadband invisibility cloak by harnessing the characteristics of material dispersion. This study provides a new approach for the development of dispersion-dominated ultrabroadband devices.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Ruichen Li, Yutong Jiang, Rongrong Zhu, Yijun Zou, Lian Shen, Bin Zheng
Summary: This study proposes a reverse design method for ultra-thin underwater acoustic metasurfaces for low-frequency broadband using a tandem fully connected deep neural network. The designed metasurfaces show a flat phase variation and almost equal phase shift interval, and the energy loss in the echo direction is greater than 10 dB. This work opens up new possibilities for low-frequency wideband underwater acoustic devices.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Applied
Zhixiang Fan, Chao Qian, Yuetian Jia, Min Chen, Jie Zhang, Xingshuo Cui, Er -Ping Li, Bin Zheng, Tong Cai, Hongsheng Chen
Summary: Deep learning is a powerful data-driven force for transforming the discovery, design, and utilization of photonics and metasurfaces. There is increasing interest in deep learning-enabled on-demand structural design, which can overcome the limitations of conventional design methods. However, collecting training data for high-dimensional scatterers is challenging and costly. In this study, a transfer-learning-assisted inverse metasurface design method is proposed to alleviate the data dilemma. Experimental results demonstrate the effectiveness of the method in achieving fast far-field customization.
PHYSICAL REVIEW APPLIED
(2022)
Article
Multidisciplinary Sciences
Zhixiang Fan, Chao Qian, Yuetian Jia, Zhedong Wang, Yinzhang Ding, Dengpan Wang, Longwei Tian, Erping Li, Tong Cai, Bin Zheng, Ido Kaminer, Hongsheng Chen
Summary: This study introduces the concept of homeostatic neuro-metasurfaces for automatic and monolithic management of dynamic wireless channels. Through the development of a flexible deep learning paradigm, the accuracy of global inverse design for large-scale metasurfaces exceeds 90%.
Article
Optics
Xiaofeng LI, Guangming Wang, Dan Liu, Yaqiang Xhuang, Bin Zhuang, Shen Lian, Xiaojun Zou, Tong Cai
Summary: This paper proposes a novel broadband circularly polarized transmitarray antenna (CPTA) enabled by axial-ratio-improved receiver-transmitter metasurface loaded with parasitic patches. The CPTA achieves a wide 3-dB axial ratio bandwidth and flat gain performance, making it suitable for wireless systems.
Article
Chemistry, Multidisciplinary
Xilai Zhao, Yanan Jiao, Jiangang Liang, Jing Lou, Jing Zhang, Jiawen Lv, Xiaohui Du, Lian Shen, Bin Zheng, Tong Cai
Summary: A hybrid THz metasurface composed of vanadium dioxide (VO2) and germanium (Ge) is proposed, allowing electrical and optical tuning methods individually or simultaneously. The device can switch on or off at four different frequencies and possesses two temporal degrees of freedom. AND and OR logic operations can be achieved at two adjacent frequency bands.
Article
Materials Science, Multidisciplinary
Yutong Jiang, Rongrong Zhu, Bo Yang, Huan Lu, Tianhang Chen, Bin Zheng
Summary: Programmable metasurfaces have gained significant attention due to their ability to shape far-field patterns. However, designing specific far-field patterns becomes challenging when irregular obstacles are present outside the metasurface. In this article, a four-layer artificial neural network method is proposed to predict the far-field radar cross section (RCS) of programmable metasurfaces in environments with obstacles, and it exhibits good agreement with simulation data. The proposed prediction model shows better learning and generalization capabilities.
FRONTIERS IN MATERIALS
(2022)
Article
Multidisciplinary Sciences
Huan Lu, Jiwei Zhao, Bin Zheng, Chao Qian, Tong Cai, Erping Li, Hongsheng Chen
Summary: This study is inspired by the human eye's accommodation mechanism and proposes a supervised-evolving learning algorithm and a neuro-metasurface focusing system. It achieves adaptive focusing for incident waves in different environments, demonstrating unprecedented potential in achromatic, beam shaping, 6G communication, and intelligent imaging.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Xingshuo Cui, Dan Liu, Zanyang Wang, Dengpan Wang, Borui Wu, Guangming Wang, Bin Zheng, Tong Cai
Summary: This paper proposes a general strategy for designing spin-locked achromatic metasurfaces with broadband and high efficiency properties. By controlling the dispersion through tuning resonance intensity, numbers, and frequency, the metasurfaces achieve achromatic deflection and focus effects in the microwave region. Experimental results demonstrate that the metasurfaces have ultra-thin profiles and can preserve the characteristics of excitation.
Article
Engineering, Electrical & Electronic
Qingze Tan, Chao Qian, Tong Cai, Bin Zheng, Hongsheng Chen
Summary: This study introduces a new method for solving complex equations using electromagnetic fields and metamaterial kernels in a closed-loop system. The system can recursively solve equations for arbitrary input signals and improve the solution accuracy by designing the metamaterial kernels through topology optimization.
PROGRESS IN ELECTROMAGNETICS RESEARCH-PIER
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Ye Dong, Xinyu Wu, Wenhao Li, Yudong Ren, Yihao Yang, Jiangtao Huangfu, Long Li, Rui Xi, Hongsheng Chen, Bin Zheng
Summary: This paper presents the design of a low profile transmitarray antenna with high polarization purity and wide operational band. It allows for adjustable beam scanning and polarization selectivity, which are crucial for radar detection and environmental adaption. By employing partially reflective surface (PRS) elements based on substrate integrated waveguide (SIW) and aperture coupling, a compact low profile transmitarray antenna with reduced element coupling is achieved. The use of SIW based phase delay enables coverage of a continuous 360 degree phase range.
2022 PHOTONICS & ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS 2022)
(2022)
