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Reducing voltage hysteresis of metal oxide anodes to achieve high energy efficiency for Li-ion batteries

Journal of Energy Chemistry 2023年第8期83卷 433-444,I0011页

作者： Xuexia Lan Xingyu Xiong Jie Cui Renzong Hu School of Materials Science and Engineering Guangdong Provincial Key Laboratory of Advanced Energy Storage MaterialsSouth China University of TechnologyGuangzhou 510640GuangdongChina Analytical and Testing Center South China University of TechnologyGuangzhou 510640GuangdongChina

In the past two decades,a lot of high-capacity conversion-type metal oxides have been intensively studied as alternative anode materials for Li-ion batteries with higher energy ***,their large voltage hysteresis(0.8-1.2 V) within reversed conversion reactions results in huge round-trip inefficiencies and thus lower energy efficiency(50%-75%) in full cells than those with graphite *** remains a long-term open question and has been the most serious drawback toward application of metal oxide *** we clarify the origins of voltage hysteresis in the typical SnO2anode and propose a universal strategy to minimize *** the established in situ phosphating to generate metal phosphates during reversed conversion reactions in synergy with boosted reaction kinetics by the added P and Mo,the huge voltage hysteresis of 0.9 V in SnO_(2),SnO_(2)-Mo,and 0.6 V in SnO2-P anodes is minimized to 0.3 V in a ternary SnO_(2)-Mo-P(SOMP) composite,along with stable high capacity of 936 mA h g^(-1)after 800 *** small voltage hysteresis can remain stable even the SOMP anode operated at high current rate of10 A g^(-1)and wide-range temperatures from 60 to 30℃,resulting in a high energy efficiency of88.5% in full *** effective strategy to minimize voltage hysteresis has also been demonstrated in Fe2O3,Co3O4-basded conversion-type *** work provides important guidance to advance the high-capacity metal oxide anodes from laboratory to industrialization.

关键词： Conversion reaction voltage hysteresis Energy efficiency Phosphating

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Understanding voltage hysteresis and decay during anionic redox reaction in layered transition metal oxide cathodes:A critical review

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Nano Research 2023年第3期16卷 3766-3780页

作者： Wei Zheng Gemeng Liang Shilin Zhang Kenneth Davey Zaiping Guo School of Chemical Engineering&Advanced Materials The University of AdelaideAdelaideSA 5005Australia

The emergence of anionic redox reactions in layered transition metal oxide cathodes provides practical opportunity to boost the energy density of rechargeable ***,the activation of anionic redox reaction in layered oxides has significant voltage hysteresis and decay that reduce battery performance and limit ***,we critically review the up-todate development of anionic redox reaction in layered oxide cathodes,summarize the proposed reaction mechanism,and unveil their connection to voltage hysteresis and decay based on the state-of-the-art *** addition,advances associated with various modification approaches to mitigate the voltage hysteresis/decay in layered transition metal oxide cathodes are also ***,we conclude with an appraisal of further research directions including rational design of high-performance layered oxide cathodes with reversible anionic redox reactions and suppressed voltage hysteresis/*** will be of immediate benefit to the development of layered oxide cathodes for high performance rechargeable batteries.

关键词： anionic redox reaction voltage hysteresis voltage decay layered transition metal oxides Li-ion battery Na-ion battery

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Carbon nanosheets derived from reconstructed lignin for potassium and sodium storage with low voltage hysteresis

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Nano Research 2021年第12期14卷 4664-4673页

作者： Keren Jiang Xuehai Tan Shengli Zhai Ken Cadien Zhi Li Department of Chemical and Materials Engineering University of AlbertaEdmontonAlbertaT6G 1H9Canada

Lignin is the second most abundant and the only nature polymer rich in aromatic *** aromatic-unit-rich precursors often yield soft carbon after carbonization,the side chains in lignin crosslink with the aromatic units and form a rigid three-dimensional(3D)structure which eventually leads to hard *** a graphene oxide-catalyzed decomposition and repolymerization process,we successfully reconstructed lignin by partially tailoring the side *** to directly carbonized lignin,the carbonized reconstructed lignin possesses significantly fewer defects,86%fewer oxygen-functionalities,82%fewer micropores,and narrower interlayer *** parameters can be tuned by the amount of catalysts(graphene oxide).When tested as anode for K-ion and Na-ion batteries,the carbonized reconstructed lignin delivers notably higher capacity at low-potential range(especially for Na-storage),shows much-improved performance at high current density,and most importantly,reduces voltage hysteresis between discharge and charge process by more than 50%,which is critical to the energy efficiency of the energy storage *** study reveals that the voltage hysteresis in K-storage is much severer than that in Na-storage for all *** practical K-ion battery applications,the voltage hysteresis deserves more attention in future electrode materials design and the reconstruct ion strategy introduced in this work provides potential low-cost solution.

关键词： lignin batteries polarization voltage hysteresis ring-forming defects

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Effects of stress dependent electrochemical reaction on voltage hysteresis of lithium ion batteries

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Applied Mathematics and Mechanics(English Edition) 2018年第10期39卷 1453-1464页

作者： Haoliang LI Yicheng SONG Bo LU Junqian ZHANG Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Department of Mechanics Shanghai University Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University

Intercalation of lithium ions into the electrodes of lithium ion batteries is affected by the stress of active materials, leading to energy dissipation and stress dependent voltage hysteresis. A reaction-diffusion-stress coupling model is established to investigate the stress effects under galvanostatic and potentiostatic operations. It is found from simulations that the stress hysteresis contributes to the voltage hysteresis and leads to the energy dissipation. In addition, the stress induced voltage hysteresis is small in low rate galvanostatic operations but extraordinarily significant in high rate cases. In potentiostatic operations, the stresses and stress induced overpotentials increase to a peak value very soon after the operation commences and decays all the left time. Therefore,a combined charge-discharge operation is suggested, i.e., first the galvanostatic one and then the potentiostatic one. This combined operation can not only avoid the extreme stress during operations so as to prevent electrodes from failure but also reduce the voltage hysteresis and energy dissipation due to stress effects.

关键词： electrochemical reaction stress voltage hysteresis lithium ion battery

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High lithium storage performance of Ni_(0.5)Fe_(0.5)O_(1-x)Nx thin film with Nio-type crystal structure

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Frontiers of Materials Science 2022年第4期16卷 63-70页

作者： Zhiyuan MA Qingbing WANG Yuhua WANG Zhaolong LI Hong ZHANG Zhicheng LI School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China School of Materials Science and Engineering Central South UniversityChangsha 410083China Energy Storage Research Institute Southwest Petroleum UniversityChengdu 610500China

The large voltage hysteresis of the NiO anode,which owes much to the intermediate product Li_(2)NiO_(2),is one of the main obstacles to its practical application in lithium-ion *** this work,we show that the incorporation of Fe-and N-ions in the Nio lattice can suppress the formation of intermediate product Li_(2)NiO_(2)and thus greatly reduces the voltage hysteresis of the Nioanode from~1.2 to~0.9 *** comparison with the pure Nio electrode,the Nio.5Feo.5O1-xNx anode exhibits significantly enhanced reversible specific capacity(959 mAh·g^(-1)at 0.3 A·g^(-1)),cycling stability(capacity retention of 96.1%at 100th cycle relative to the second cycle)and rate capability(442 at 10 A·g^(-1)).These results provide a practical method to enhance the lithium storage performance of the Nio anode and more importantly a new solution to the large voltage hysteresis of conversion-type anodes.

关键词： nickel oxide thin film doping magnetron sputtering conversion-type anode voltage hysteresis

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