Article
Chemistry, Physical
Fulya Ulu Okudur, Satish Kumar Mylavarapu, Mohammadhosein Safari, Dries De Sloovere, Jan D'Haen, Bjorn Joos, Periyasamy Kaliyappan, An-Sofie Kelchtermans, Pieter Samyn, Marlies K. Van Bael, An Hardy
Summary: This study investigates the influence of pre-calcination temperature, time, and oven type on the particle size and morphology of LNMO powder, and subsequently on the electrochemical performance of lithium-ion batteries. By optimizing the particle size and morphology of LNMO powder, superior initial discharge capacity and capacity retention can be achieved for Li vertical bar LNMO coin cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Tianchi Chen, Fangchang Lin, Hongming Wu, Dengfeng Zhou, Jiling Song, Jianbing Guo
Summary: The LiNi0.5-xZnxMn1.48Y0.02O4 (x = 0.01, 0.03, 0.05) series were prepared via a sol-gel method to improve the electrochemical performance of the LiNi0.5Mn1.5O4 (LNMO) sample. The Zn-Y co-doping led to increased lattice parameters, morphological evolution, decreased Mn3+ content, and better electrochemical properties compared to the pristine LNMO. Among the samples, LiNi0.47Zn0.03Mn1.48Y0.02O4 (0.03ZnY) showed optimal electrochemical properties at room temperature and elevated temperature, with a higher discharge capacity and capacity retention than the pristine sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Inorganic & Nuclear
Weixi Tian, Weihao Zeng, Tingting Wang, Jinsai Tian, Dachao Yuan, Juan Wang, Shichun Mu
Summary: Due to its higher energy density, high thermal stability, and low cost, the spinel LiNi0.5Mn1.5O4 (LNMO) has great potential as a cathode material for lithium-ion batteries. However, the interfacial and bulk reactions in LNMO can lead to capacity decay. In this study, a Ge-doping strategy is proposed to regulate the ratio of ordered/disordered phases in LNMO, resulting in exceptional structural stability and improved cycling performance. The incorporation of Ge into LNMO increases the amount of Mn4+ and blocks the diffusion of transition metal ions, preventing capacity deterioration during cycling.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Analytical
Seon Hwa Lee, Ki Young Kwon, Byeong Kil Choi, Hyun Deog Yoo
Summary: Nickel-rich cathodes are advantageous for lithium-ion batteries. Co-precipitation method can produce particles with uniform shape and size, resulting in improved performance of the cathode.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Xiaoyan Xing, Shihang Dai, Wenlong Li, Xuetian Li, Zhongcai Shao, Hongmei Shao
Summary: In this study, spherical LiNi0.5Mn1.5O4 cathode material was successfully prepared using surfactant-assisted co-precipitation method. The material showed excellent electrochemical performance and stability.
Article
Chemistry, Physical
Zawar Alam Qureshi, Hanan Abdurehman Tariq, Hiba Mohammad Hafiz, Rana Abdul Shakoor, Siham AlQaradawi, Ramazan Kahraman
Summary: This study presents a novel cobalt-free LiNi0.5Mn1.5O4 cathode material with ceria coating and graphene wrapping. The material exhibits improved cyclability and capacity retention, thanks to the prevention of unwanted phases formation and morphology alteration by the ceria coating, as well as reduced adverse reactions and Mn3+ dissolution by the ceria coating and graphene wrapping. This innovative material design strategy can be applied to enhance the electrochemical performance of other lithium-ion battery cathode materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Anh Tien Nguyen, Viet Duc Phung, Valentina Olegovna Mittova, Hai Dang Ngo, Thuan Ngoc Vo, My Linh Le Thi, Van Hoang Nguyen, Irina Yakovlevna Mittova, My Loan Phung Le, Yong Nam Ahn, Il Tae Kim, Tuan Loi Nguyen
Summary: Nanostructured HoFeO3 perovskite was successfully prepared via co-precipitation of Fe3+ and Ho3+ ions in ethanol, followed by heat treatment. This anode material exhibited excellent electrochemical properties in lithium-ion batteries, showing high capacity retention and good rate performance.
SCRIPTA MATERIALIA
(2022)
Article
Engineering, Environmental
Chao Wu, Shuang Cao, Xin Xie, Changmeng Guo, Heng Li, Zhi Li, Zihao Zang, Baobao Chang, Gairong Chen, Xiaowei Guo, Tianjing Wu, Xianyou Wang
Summary: In this study, a high-performance Co-free lithium-rich cathode material was successfully prepared, which showed high discharge capacity, excellent cycling stability, and outstanding performance even at high rates after fluorine doping. This work provides a meaningful exploration for the development of Co-free lithium-rich cathode materials.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Zhongxue Zhang, Lianjing Feng, Huanhuan Liu, Lijuan Wang, Song Wang, Zhiyuan Tang
Summary: The co-doping strategy used to synthesize Li2ZnTi3O8 greatly enhances its structural stability and electrochemical performance, showing superior performance at various temperatures.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Materials Science, Multidisciplinary
M. Benchikhi, A. Azzouzi, R. Hattaf, R. El Ouatib, B. Durand
Summary: In this study, a series of well-defined nanocrystal solid-solutions with different morphologies were prepared by a surfactant-free coprecipitation method. The formation of these solid-solutions, as well as the composition and structure of the powders, were confirmed by various characterization techniques. The nanocrystal solid-solutions exhibited a relatively small bandgap bowing parameter, indicating good miscibility between the alloying constituents.
Article
Materials Science, Multidisciplinary
Xingfu Zi, Xin Huang, Jiling Song, Hongming Wu, Jianbing Guo
Summary: The application of LiNi0.49Mn1.49-xSrxY0.02O4 (x = 0.02, 0.04, 0.06) synthesized by sol-gel method in high energy density lithium-ion batteries was studied. The doping of Sr and Y improved the microscopic morphology and electrochemical performance of the LNMO material, with the LiNi0.49Mn1.45Sr0.04Y0.02O4 LNMO sample showing the optimal electrochemical performance.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Hanan Abdurehman Tariq, Jeffin James Abraham, Aisha Abdul Quddus, Siham AlQaradawi, Ramazan Kahraman, R. A. Shakoor
Summary: The study successfully synthesized Y2O3-coated quasi-spheres of high-energy density LiNi0.5Mn1.5O4 cathode material covered in graphene using a microwave-assisted chemical co-precipitation technique. The graphene-assisted coating not only improves the electrical conductivity of the electrode but also effectively inhibits the production of undesirable phases, enhancing the cyclic performance of the material. Furthermore, the proposed material synthesis strategy provides a new approach for the study of other types of electrode materials.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Electrochemistry
Qi Liu, Zhenqian Wu, Jingying Sun, Ruimei Xu, Xianwei Li, Xiao Yu, Yong Liu
Summary: A crack-free single-crystalline, Al-doped Co-free Ni-rich cathode material was successfully fabricated via a one-step stirring-assisted cation chelation and reassembly route. The material exhibited high capacity, excellent rate capability, and good cycling stability. The outstanding electrochemical performance is attributed to the synergistic effect of the single crystalline structure and successful Al doping in the cathode.
ELECTROCHIMICA ACTA
(2023)
Article
Nanoscience & Nanotechnology
Jinxing Li, Hanying Xu, Jie Li, Xinping Chen, Yujuan Zhang, Wei Liu, Wenting Li, Ce Han, Shengli An, Xindong Wang, Xinping Qiu
Summary: In this study, a simple and affordable method was developed to construct a robust cathode-electrolyte interphase (CEI) layer by quenching a cobalt-free lithium-rich layered oxide in a specific solvent. The customized CEI layer with well-distributed LiF, TMF x , and partial organic component CF x acted as a physical barrier to prevent the contact between the cathode and electrolyte, which improved the stability of the CEI layer. The CEI layer also enhanced the cycle stability and initial coulomb efficiency of the cathode material, offering a valuable strategy for designing stable interface chemistry in lithium-ion batteries.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
M. Akhilash, P. S. Salini, K. Jalaja, Bibin John, T. D. Mercy
Summary: A Li-rich cathode material, Li1.5Ni0.25Mn0.75O2.5, with a well-ordered layered structure was successfully synthesized using a simple carbonate co-precipitation method followed by calcination. SEM analysis showed cylinder-shaped particles with diameter in the range 100-350 nm, and electrochemical evaluation revealed an initial specific capacity of around 240 mAhg(-1) at C/20 rate.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Shenghong Chang, Yunjiao Li, Junchao Zheng, Dianwei Zhang, Jiachao Yang, Yongxiang Chen, Jia Guo, Jie Zhu, Yike Xiong, Wei Li
Article
Chemistry, Physical
Wei Li, Yunjiao Li, LiShan Yang, YongXiang Chen, Jia Guo, Jie Zhu, Guo Lin Cao
Article
Chemistry, Multidisciplinary
Wei Li, Lishan Yang, Yunjiao Li, Yongxiang Chen, Jia Guo, Jie Zhu, Hao Pan, Xiaoming Xi
FRONTIERS IN CHEMISTRY
(2020)
Article
Chemistry, Physical
Wei Li, Yunjiao Li, LiShan Yang, Jie Zhu, Jia Guo, Jia Chao Yang
Summary: In this study, a hybrid ZrO2-Li2ZrO3 (LZO) coating layer was fabricated on Ni-rich cathode materials, improving their cycling stabilities and capacity retention at high cutoff voltages. The coating not only maintains the structural stability of the materials but also prevents the variation of electrochemical resistance after cycles, significantly enhancing the electrochemical properties.
Article
Chemistry, Physical
Yongxiang Chen, Shuliang Luo, Jin Leng, Shiyi Deng, Sheng Yan, Xin Tian, Yunjiao Li, Jia Guo, Tongxing Lei, Junchao Zheng
Summary: Li- and Mn-rich layered oxides are promising materials for next-generation commercial lithium ion batteries due to their high capacity and low cost. The optimal synthesis conditions were found to be at 500°C for 4 h, 750°C for 4 h, and 840°C for 10 h with a Li/TM ratio of 1.4. The synthesized materials showed excellent electrochemical performance with high initial discharge capacity and good capacity retention after cycling.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Energy & Fuels
Jia Guo, Yaqi Li, Kjeld Pedersen, Daniel-Ioan Stroe
Summary: This article systematically describes the aging mechanism of lithium-ion batteries in real-life electric vehicle applications, focusing on the aging behavior of batteries in charging, standby, and driving modes under different working conditions. It provides practical guidance and methods to prolong battery life for users, battery designers, vehicle manufacturers, and material recovery companies.
Article
Chemistry, Analytical
Shan Wang, Jia Guo, Yunjiao Li, Dianwei Zhang, Chunxia Li, Xugang Ren, Shuaiwei Liu, Yike Xiong, Shuaipeng Hao, Junchao Zheng
Summary: The CuO coating is successfully constructed to stabilize the surface structure of LNMO, leading to excellent rate performance and cyclability of the material. The enhancement of structural stability and lithium ion diffusion rate by the CuO coating contribute to the outstanding electrochemical performances of the LNMO cathode material.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Physical
Jia Guo, Wei Li
Summary: Single-crystal LiNi0.7Co0.15Mn0.15O2 prepared by sol-gel method exhibits better cyclic stability and safety compared to their polycrystalline counterparts. The single-crystal material also shows improved thermal stability and lower transition-metal dissolution, without the need for crushing or molten-salt addition during synthesis.
ACS APPLIED ENERGY MATERIALS
(2022)
Review
Engineering, Chemical
Pengwei Li, Xiaoning Xia, Jia Guo
Summary: This article systematically reviews the life cycle carbon footprint of batteries, analyzes the main influencing factors of carbon emissions in different stages, and proposes suggestions for reducing the carbon footprint of batteries, providing guidance for the large-scale deployment of EVs and the achievement of carbon neutrality.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Applied
Jia Guo, Yaqi Li, Jinhao Meng, Kjeld Pedersen, Leonid Gurevich, Daniel-Ioan Stroe
Summary: This study investigates the capacity increase observed in the early stage of Li-ion battery cycling. The results show that the increased capacity mainly originates from the graphite anode, and larger depth of discharge and high temperatures accelerate this capacity increase.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Review
Chemistry, Multidisciplinary
Yunhong Che, Xiaosong Hu, Xianke Lin, Jia Guo, Remus Teodorescu
Summary: This paper provides a comprehensive review of aging mechanisms and health prognostic methods for lithium-ion batteries, and discusses the main challenges and research prospects. The complex relationships between aging mechanisms, modes, factors, and types are summarized. Prognostic methods are categorized based on time scales and objectives, followed by detailed reviews and comparative evaluations. Key challenges are presented and potential solutions are discussed. Future trends and new ideas for battery health prognostics are proposed.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Applied
Yaqi Li, Jia Guo, Kjeld Pedersen, Leonid Gurevich, Daniel-Ioan Stroe
Summary: This study designs a multi-step fast charging method to extend the lifetime of Li-ion batteries and investigates the aging mechanisms for different charging methods. The results show that one of the designed multi-step charging protocols allows for a 200 full equivalent cycles longer lifetime as compared to the standard charging method, while reducing the charging time by 20%.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Article
Chemistry, Physical
Jia Guo, Siyu Jin, Xin Sui, Xinrong Huang, Yaolin Xu, Yaqi Li, Peter Kjaer Kristensen, Deyong Wang, Kjeld Pedersen, Leonid Gurevich, Daniel-Ioan Stroe
Summary: This study reveals the aging mechanism of commercial lithium-ion batteries during constant current cycling, including capacity fading, electrode interface degradation, and lithium loss. The findings provide important guidance for the design of commercial batteries and the improvement of charging and discharging protocols.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Applied
Jia Guo, Yunhong Che, Kjeld Pedersen, Daniel-Ioan Stroe
Summary: In this paper, the impedance spectrum of a battery is predicted using the battery charging voltage curve and optimized based on electrochemical mechanistic analysis and machine learning. The internal electrochemical relationships between the charging curve, incremental capacity curve, and the impedance spectrum are explored, improving the physical interpretability and defining the proper partial voltage range for machine learning models. The experimental results show that the predicted errors for impedance spectrum are less than 1.9 mO with the proper partial voltage range selected by the corelative analysis of the electrochemical reactions.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Review
Electrochemistry
Yaqi Li, Jia Guo, Kjeld Pedersen, Leonid Gurevich, Daniel-Ioan Stroe
Summary: Lithium-ion batteries have great potential but undergo irreversible aging during use. Post-mortem analysis has been developed to better understand the internal changes of lithium batteries when they age. This article summarizes the electrical properties analysis and post-mortem analysis methods for lithium batteries, comparing the advantages of both destructive and non-destructive methods. These techniques can provide new ideas for predicting and diagnosing the aging degree of lithium batteries, supporting battery life control strategies and design.