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Challenges and strategies of lithium-rich layered oxides for Li-ion batteries

Nano Research 2023年第1期16卷 391-402页

作者： Lu Nie Shaojie Chen Wei Liu School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

lithium-ion batteries are considered a promising energy storage technology in portable electronics and electric vehicles due to their high energy density,competitive cost,and environmental *** cathode materials is an effective way to meet the demand for better batteries,of which the utilization of high-voltage cathode materials is an important development *** recent years,lithium-rich layered oxides have gained great attention due to their desirable energy *** review presents the relationships between lattice structure and electrochemical properties,the underlying degradation mechanisms,and corresponding modification *** recent progress and strategies are then highlighted,including element doping,surface coating,morphology design,size control,***,a concise perspective for future developments and practical applications of lithium-rich layered oxides has been provided.

关键词： lithium-ion batteries lithium-rich layered oxides lattice structure degradation mechanism element doping

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Suppression of voltage decay through adjusting tap density of lithium-rich layered oxides for lithium ion battery

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Journal of Materials Science & Technology 2020年第23期58卷 107-113页

作者： Muhammad Zubair Errui Wang Yinzhong Wang Boya Wang Lin Wang Yuan Liang Haijun Yu College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaBeijing University of TechnologyBeijing 100124China

The voltage decay of lithium-rich layered oxides(LLOs)is still one of the key challenges for their application in commercial battery although these materials possess the advantages of high specific capacity and low *** this work,the relationship between voltage decay and tap density of LLOs has been *** voltage decay can be significantly suppressed with the increasing tap density as well as the homogenization of the primary or secondary particle size of agglomerated spherical *** results have shown that an extreme small voltage decay of 0.98 m V cycle^(-1)can be obtained through adjusting the tap density of agglomerated spherical LLOs to 1.99 g cm^(-3),in which the size of primary and secondary particles are *** work offers a new insight towards the voltage decay and capacity fading of LLOs through precursor preparation process,promoting their application in the real battery in the future.

关键词： lithium-rich layered oxides Tap density Agglomerated spherical particle Voltage decay Cycle stability

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Facet-dependent Thermal and Electrochemical Degradation of lithium-rich layered oxides

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Energy & Environmental Materials 2023年第6期6卷 345-355页

作者： Guohua Li Zhimin Ren Haoxiang Zhuo Changhong Wang Biwei Xiao Jianwen Liang Ruizhi Yu Ting Lin Alin Li Tianwei Yu Wei Huang Anbang Zhang Qinghua Zhang Jiantao Wang Xueliang Sun National Power Battery Innovation Center GRINM Group Corporation LimitedBeijing 100088China China Automotive Battery Research Institute Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China Department of Mechanical and Materials Engineering University of Western Ontario London ON N6A 5B9Canada Faculty of Materials and Manufacturing Key Laboratory of Adv.Funct.Mater.Education Ministry of China Beijing University of TechnologyBeijing 100124China

lithium-rich layered oxides(LLOs)are promising candidate cathode materials for safe and inexpensive high-energy-density Li-ion ***,oxygen dimers are formed from the cathode material through oxygen redox activity,which can result in morphological changes and structural transitions that cause performance deterioration and safety ***,a flake-like LLO is prepared and aberration-corrected scanning transmission electron microscopy(STEM),in situ high-temperature X-ray diffraction(HT-XRD),and soft X-ray absorption spectrum(sXAS)are used to explore its crystal facet degradation behavior in terms of both thermal and electrochemical ***-induced degradation behavior of LLO in different facet reveals significant anisotropy at high *** degradation originates from side facets,such as the(010)facet,while the close(003)facet is *** results are further understood through ab initio molecular dynamics calculations,which show that oxygen atoms are lost from the{010}***,the facet degradation process is that oxygen molecular formed in the interlayer and accumulated in the ab plane during heating,which result in crevice-voids in the ab plane *** study reveals important aspects of the mechanism responsible for oxygen-anionic activity-based degradation of LLO cathode materials used in lithium-ion *** particular,this study provides insight that enables precise and efficient measures to be taken to improve the thermal and electrochemical stability of an LLO.

关键词： electrochemical degradation facet degradation lithium-rich layered oxides thermal degradation

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Mitigation of voltage decay in Li-rich layered oxides as cathode materials for lithium-ion batteries

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Nano Research 2020年第1期13卷 151-159页

作者： Wenhui Hu Youxiang Zhang Ling Zan Hengjiang Cong College of Chemistry and Molecular Sciences Wuhan UniversityWuhan430072China Shenzhen Research Institute of Wuhan University Shenzhen518000China

lithium-rich layered oxides(LLOs)have been extensively studied as cathode materials for lithium-ion batteries(LIBs)by researchers all over the world in the past decades due to their high specific capacities and high charge-discharge ***,as cathode materials LLOs have disadvantages of significant voltage and capacity decays during the charge-discharge *** was shown in the past that fine-tuning of structures and compositions was critical to the performances of this kind of *** this report,LLOs with target composition of Li1.17Mn0.50Ni0.24Co0.09O2 were prepared by carbonate co-precipitation method with different pH values.X-ray powder diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscope(TEM),and electrochemical impedance spectroscopies(EIS)were used to investigate the structures and morphologies of the materials and to understand the improvements of their electrochemical *** the pH values increased from 7.5 to 8.5,the Li/Ni ratios in the compositions decreased from 5.17 to 4.64,and the initial Coulombic efficiency,cycling stability and average discharge voltages were gained ***,the material synthesized at pH=8.5 delivered a reversible discharge capacity of 263 mAhg−1 during the first cycle,with 79.0%initial Coulombic efficiency,at the rate of 0.1 C and a superior capacity retention of 94%after 100 cycles at the rate of 1 ***,this material exhibited an initial average discharge voltage of 3.65 V,with a voltage decay of only 0.09 V after 50 charge-discharge *** improved electrochemical performances by varying the pH values in the synthesis process can be explained by the mitigation of layered-to-spinel phase transformation and the reduction of solid-electrolyte interface(SEI)*** hope this work can shed some light on the alleviation of voltage and capacity decay issues of the LLOs cathode materials.

关键词： lithium ion batteries cathode lithium-rich layered oxides voltage decay Li1.17Mn0.50Ni0.24Co0.09O2

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A Facile Li_(2)TiO_(3) Surface Modification to Improve the Structure Stability and Electrochemical Performance of Full Concentration Gradient Li-rich oxides

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Energy & Environmental Materials 2024年第3期7卷 41-48页

作者： Naifang Hu Yuan Yang Lin Li Yuhan Zhang Zhiwei Hu Lan Zhang Jun Ma Guanglei Cui Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China Institute of Materials Science and Engineering Ocean University of ChinaQingdao 266100China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China Max Planck Institute for Chemical Physics of Solids Nothnitzer Strasse 40Dresden D-01187Germany CAS Key Laboratory of Green Process and Engineering Beijing Key Laboratory of Ionic Liquids Clean ProcessState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Shandong Energy Institute Qingdao 266101China

Full concentration gradient lithium-rich layered oxides are catching lots of interest as the next generation cathode for lithium-ion batteries due to their high discharge voltage,reduced voltage decay and enhanced rate performance,whereas the high lithium residues on its surface impairs the structure stability and long-term cycle ***,a facile multifunctional surface modification method is implemented to eliminate surface lithium residues of full concentration gradient lithium-rich layered oxides by a wet chemistry reaction with tetrabutyl titanate and the post-annealing *** realizes not only a stable Li_(2)TiO_(3)coating layer with 3D diffusion channels for fast Li^(+)ions transfer,but also dopes partial Ti^(4+)ions into the sub-surface region of full concentration gradient lithium-rich layered oxides to further strengthen its crystal ***,the modified full concentration gradient lithium-rich layered oxides exhibit improved structure stability,elevated thermal stability with decomposition temperature from 289.57℃to 321.72℃,and enhanced cycle performance(205.1 mAh g^(-1)after 150 cycles)with slowed voltage drop(1.67 mV per cycle).This work proposes a facile and integrated modification method to enhance the comprehensive performance of full concentration gradient lithium-rich layered oxides,which can facilitate its practical application for developing higher energy density lithium-ion batteries.

关键词： full concentration gradient lithium-rich layered oxides structure stability surface modification

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