Article
Engineering, Environmental
Rio Akbar Yuwono, Fu-Ming Wang, Nae-Lih Wu, Yan-Cheng Chen, Hsi Chen, Jin-Ming Chen, Shu-Chih Haw, Jyh-Fu Lee, Rui-Kun Xie, Hwo-Shuenn Sheu, Po-Ya Chang, Chusnul Khotimah, Laurien Merinda, Rocan Hsing
Summary: The rapid growth of the electric vehicle market has driven the development of lithium-ion batteries. Researchers are investigating Co-free and Ni-rich cathodes, such as LiNiO2, and Si anodes to meet the demand for high-energy-density and low-cost batteries. However, challenges with LiNiO2, such as cation mixing and safety risks, hinder its commercialization. Increasing the oxygen partial pressure during the calcination process of LiNiO2 has been found to improve its structural and electrochemical performance. This study proposes a mechanism by which the calcination oxygen partial pressure affects LiNiO2 and demonstrates that this strategy can enhance the performance of lithium-ion batteries.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Ceramics
Fanghui Du, Lei Ding, Wenjing Shi, Yan Wang, Zhongxu Fan, Yunwu Li, Junwei Zheng
Summary: The high cost of Co drives the increase of Ni fraction and the decline of Co ingredient in commercial Ni-rich cathodes, resulting in convergence towards LiNiO2. However, pure LNO has poor cycling and rate performance due to cation mixing and structural degradation. In this study, Mg-doped LNO was synthesized and it was found that Mg dopant reduced cation mixing, enlarged the lattice, and facilitated Li+ diffusion, enhancing the rate performance. Mg doping also disrupted ordering in the Li layers and rearrangements in the Ni layers, inhibiting phase separation at the end of charge. Furthermore, Mg doping alleviated c-axis shrinkage and resulted in reversible structure evolution, less microcracks, stable impedance growth, and excellent electrochemical performance during long-term cycling.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Yudong Zhang, Jiuding Liu, Wence Xu, Yong Lu, Hua Ma, Fangyi Cheng, Jun Chen
Summary: This study reports a concentration-gradient Mg and Al doped cathode material, which exhibits stability, high capacity, outstanding cyclability, and remarkable rate capability. The gradient co-doping boosts the electrochemical performance and enhances Li-ion diffusion and thermal stability.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Physical
Wenlu Sun, Lu Chen, Jun Wang, Hui Zhang, Zhilong Quan, Fang Fu, Huabin Kong, Shibin Wang, Hongwei Chen
Summary: A dual-salt electrolyte composed of Mg and Li salts was reported to optimize both cathode and anode in Mg batteries. The electrolyte enabled a unique Mg2+/Li+ co-insertion organic cathode, resulting in a high energy density of 23 W h kg(-1) and an ultra-long lifetime of over 3000 cycles. This study provides new insights into multiple-ion storage in organic electrodes for advanced batteries, considering the potential of organic structural design.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Energy & Fuels
Magdalena Zybert, Hubert Ronduda, Karolina Dabrowska, Andrzej Ostrowski, Kamil Sobczak, Dariusz Moszynski, Bartosz Hamankiewicz, Zbigniew Rogulski, Wioletta Rarog-Pilecka, Wladyslaw Wieczorek
Summary: The demand for efficient lithium-ion batteries for vehicles and energy storage requires improving the properties of cathode materials. This study successfully suppressed the mixing of Ni/Li cations in cathode materials by introducing rare earth elements, resulting in significantly improved electrochemical performance.
Article
Chemistry, Physical
Tian Rao, Peng Gao, Zimeng Zhu, Shan Wang, Liubin Ben, Yongming Zhu
Summary: The dual-doped LNO cathode material with magnesium and manganese exhibits higher capacity retention, more stable charge transfer impedance, and Li+ diffusion coefficient, improving its structural stability and cycling performance compared to the bare LNO counterpart.
SOLID STATE IONICS
(2022)
Article
Electrochemistry
Sung-Beom Kim, So-Yeon Ahn, Ji-Hwan Kim, Jae-Sung Jang, Kyung-Won Park
Summary: Recently, researchers have extensively studied Ni-rich ternary transition metal oxides (Li(NiCoMn)O2, NCM) with more than 80% Ni as high-capacity cathodes. In this study, a quaternary cathode, Ni-rich Al-doped NCM, was synthesized using a facile solvothermal method without additional Al doping process. Compared to an undoped NCM cathode, the quaternary Ni-rich cathode showed improved lithium-ion battery performance (retentions of 82.0% and 65.8% after 100 and 250 cycles, respectively). The superior stability of the quaternary Ni-rich cathode may be attributed to the stable cathode structure resulting from Al doping.
ELECTROCHEMISTRY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Taehee Kim, Junwon Lee, Min Jae You, Chang Hoon Song, Seung-Min Oh, Janghyuk Moon, Jung Ho Kim, Min-Sik Park
Summary: The adoption of Li2CuO2 as a Li-excess cathode additive for compensating irreversible Li+ loss has gained interest for high-energy-density lithium-ion batteries. However, its practical use is restricted due to structural instability and spontaneous oxygen evolution, resulting in poor cycling performance. In this study, cosubstitution by heteroatoms, such as nickel and manganese, was demonstrated to improve the structural stability and electrochemical performance of Li2CuO2. These findings provide new conceptual pathways for developing advanced cathode additives for high-energy LIBs.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Muhd Firdaus Kasim, Wan Aida Hazwani Wan Azizan, Kelimah Anak Elong, Norashikin Kamarudin, Muhamad Kamil Yaakob, Nurhanna Badar
Summary: Ti-doped Ni-rich cathode material LiNi0.7Co0.3O2 showed expanded lattice structure, lower cation mixing, and enhanced lithium-ion kinetics, leading to improved specific discharge capacity and capacity retention compared to pristine samples. Experimental and first principles studies indicated that Ti species can stabilize crystal structure and facilitate Li-ion movement, making Ti-doped materials promising candidates for rechargeable Li-ion batteries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Binhong Wu, Zhiye Lin, Gaige Zhang, Dehui Zhang, Wenguang Zhang, Guanjie Li, Yanxia Che, Ling Chen, Huirong Wang, Weishan Li, Min Chen, Guozhong Cao
Summary: Ni-rich layered oxides have attracted significant attention as cathode materials for high-energy rechargeable lithium ion batteries due to their high capacity and relatively low cost. However, the mixing of Ni and Li ions often leads to capacity degradation, structure evolution, and poor thermal stability. In this study, a universal strategy using Li2MnO3 injection was developed to mitigate cation mixing and improve the electrochemical properties, structural integrity, and thermal stability of Ni-rich cathode materials. The results showed significantly improved capacity retention and voltage decay compared to the conventional material.
ENERGY STORAGE MATERIALS
(2022)
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)
Article
Chemistry, Multidisciplinary
Ziru Hu, Donghong Duan, Haorui Wang, Shoudong Xu, Liang Chen, Ding Zhang
Summary: Boron doping has significant effects on improving the performance of LiNi0.8Co0.1Mn0.1O2. It reduces cation mixing, decreases charge transfer resistance, and improves the reversibility of the phase transition. The cathode material with 1.0 mol% boron doping shows excellent cycling performance.
CHEMICAL COMMUNICATIONS
(2023)
Article
Electrochemistry
Guo-Xin Huang, Ruo-Heng Wang, Xiao-Yan Lv, Jing Su, Yun-Fei Long, Zu-Zeng Qin, Yan-Xuan Wen
Summary: LiNiO2, a promising cathode material, suffers from poor cyclic stability and inferior rate performance. A strategy based on the synergistic effect of a strong Nb-O bond, high valence state, and larger ionic radius was developed to improve the properties of LiNiO2. The proposed doping strategy effectively enhances the stability and performance of LiNiO2.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Junxin Chen, Zhe Huang, Weihao Zeng, Jingjing Ma, Fei Cao, Tingting Wang, Weixi Tian, Shichun Mu
Summary: Surface modification and Co doping can effectively suppress Li/Ni mixing and improve the electrochemical performance of cathode materials.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Anand Rajkamal, Hern Kim
Summary: The higher Ni content with less cobalt usage in lithium nickel cobalt manganese oxide cathode materials results in higher power rating and energy density in lithium-ion batteries. Cation doping effectively suppresses the mixing of Ni ions in the lithium layer. Different cationic dopants have varying effects on the structural stability and performance of the cathode material.
ACS APPLIED ENERGY MATERIALS
(2021)
