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Revisiting the capacity-fading mechanism of P2-type sodium layered oxide cathode materials during high-voltage cycling 被引量:1
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作者 Meidan Jiang Guannan Qian +14 位作者 Xiao-Zhen Liao Zhouhong Ren Qingyu Dong Dechao Meng Guijia Cui Siqi Yuan Sang-Jun Lee Tian Qin Xi Liu Yanbin Shen Yu-Shi He Liwei Chen Yijin Liu Linsen Li Zi-Feng Ma 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第6期16-25,I0002,共11页
P2-type sodium layered oxide cathode (Na_(2/3)Ni_(1/3)Mn_(2/3)O_(2)P2-NNMO) has attracted great attention as a promising cathode material for sodium ion batteries because of its high specific capacity. However, this m... P2-type sodium layered oxide cathode (Na_(2/3)Ni_(1/3)Mn_(2/3)O_(2)P2-NNMO) has attracted great attention as a promising cathode material for sodium ion batteries because of its high specific capacity. However, this material suffers from a rapid capacity fade during high-voltage cycling. Several mechanisms have been proposed to explain the capacity fade, including intragranular fracture caused by the P2-O2 phase transion, surface structural change, and irreversible lattice oxygen release. Here we systematically investigated the morphological, structural, and chemical changes of P2-NNMO during high-voltage cycling using a variety of characterization techniques. It was found that the lattice distortion and crystal-plane buckling induced by the P2-O2 phase transition slowed down the Na-ion transport in the bulk and hindered the extraction of the Na ions. The sluggish kinetics was the main reason in reducing the accessible capacity while other interfacial degradation mechanisms played minor roles. Our results not only enabled a more complete understanding of the capacity-fading mechanism of P2-NNMO but also revealed the underlying correlations between lattice doping and the moderately improved cycle performance. 展开更多
关键词 Phase transition Layered cathode Buckling capacity fading mechanism Sodium-ion batteries
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High-pressure capacity expansion and water injection mechanism and indicator curve model for fractured-vuggy carbonate reservoirs
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作者 Lixin Chen Chengzao Jia +6 位作者 Rujie Zhang Ping Yue Xujian Jiang Junfang Wang Zhou Su Yun Xiao Yuan Lv 《Petroleum》 EI CSCD 2024年第3期511-519,共9页
Water injection for oil displacement is one of the most effective ways to develop fractured-vuggy carbonate reservoirs.With the increase in the number of rounds of water injection,the development effect gradually fail... Water injection for oil displacement is one of the most effective ways to develop fractured-vuggy carbonate reservoirs.With the increase in the number of rounds of water injection,the development effect gradually fails.The emergence of high-pressure capacity expansion and water injection technology allows increased production from old wells.Although high-pressure capacity expansion and water injection technology has been implemented in practice for nearly 10 years in fractured-vuggy reservoirs,its mechanism remains unclear,and the water injection curve is not apparent.In the past,evaluating its effect could only be done by measuring the injection-production volume.In this study,we analyze the mechanism of high-pressure capacity expansion and water injection.We propose a fluid exchange index for high-pressure capacity expansion and water injection and establish a discrete model suitable for high-pressure capacity expansion and water injection curves in fractured-vuggy reservoirs.We propose the following mechanisms:replenishing energy,increasing energy,replacing energy,and releasing energy.The above mechanisms can be identified by the high-pressure capacity expansion and water injection curve of the well HA6X in the Halahatang Oilfield in the Tarim Basin.By solving the basic model,the relative errors of Reservoirs I and II are found to be 1.9%and 1.5%,respectively,and the application of field examples demonstrates that our proposed high-pressure capacity expansion and water injection indicator curve is reasonable and reliable.This research can provide theoretical support for high-pressure capacity expansion and water injection technology in fracture-vuggy carbonate reservoirs. 展开更多
关键词 Fractured-vuggy carbonate reservoirs High-pressure capacity expansion and water injection mechanism Water injection indicator curve
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Interpretable hybrid machine learning demystifies the degradation of practical lithium-sulfur batteries
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作者 Zhi Wei Seh 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第4期54-55,共2页
The ever-increasing future demands of electrification and grid storage have spurred continued research to develop rechargeable battery chemistries for reliable energy storage[1].Beyond current lithium-ion batteries,li... The ever-increasing future demands of electrification and grid storage have spurred continued research to develop rechargeable battery chemistries for reliable energy storage[1].Beyond current lithium-ion batteries,lithium–sulfur battery represents a promising system due to its high energy density(2600 Wh kg^(-1))and low material cost[2]. 展开更多
关键词 Machine learning Lithium-sulfur batteries Battery prognosis capacity degradation mechanism
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Mechanics Unloading Analysis and Experimentation of a New Type of Parallel Biomimetic Shoulder Complex 被引量:4
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作者 HOU Yulei LI Zhisen +3 位作者 WANG Yi ZHANG Wenwen ZENG Daxing ZHOU Yulin 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2016年第4期649-658,共10页
The structure design for high ratio of carrying capacity to deadweight is one of the challenges for the bionic mechanism,while the problem concerning high carrying capacity has not yet be solved for the existing shoul... The structure design for high ratio of carrying capacity to deadweight is one of the challenges for the bionic mechanism,while the problem concerning high carrying capacity has not yet be solved for the existing shoulder complex.A new type biomimetic shoulder complex,which adopts 3-PSS/S(P for prismatic pair,S for spherical pair) spherical parallel mechanism(SPM),is proposed.The static equilibrium equations of each component are established by using the vector method and the equations for constrain forces with certain load are solved.Then the constrain force on the middle limb and that on the side limbs are compared in order to verify the unloading performance of the mechanism.In addition,the prototype mechanism of the shoulder complex is developed,and the force feedback experiment is conducted to verify the static analysis,which indicates that the middle limb suffers most of the external force and the effect of mechanics unloading is achieved.The 3-PSS/S spherical parallel mechanism is presented for the shoulder complex,and the realization of mechanics unloading is benefit for the improvement of the carrying capacity of the shoulder complex. 展开更多
关键词 biomimetic shoulder complex humanoid robot spherical parallel mechanism carrying capacity mechanics unloading
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Bearing Behaviors of Stiffened Deep Cement Mixed Pile 被引量:1
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作者 吴迈 赵欣 《Transactions of Tianjin University》 EI CAS 2006年第3期209-214,共6页
A series of investigations were conducted to study the bearing capacity and load transfer mechanism of stiffened deep cement mixed (SDCM) pile. Laboratory tests including six specimens were conducted to investigate ... A series of investigations were conducted to study the bearing capacity and load transfer mechanism of stiffened deep cement mixed (SDCM) pile. Laboratory tests including six specimens were conducted to investigate the frictional resistance between the concrete core and the cementsoil. Two model piles and twenty-four full-scale piles were tested to examine the bearing behavior of single pile. Laboratory and model tests results indicate that the cohesive strength is large enough to ensure the interaction between core pile and the outer cement-soil. The full-scale test results show that the SDCM piles exhibit similar bearing behavior to bored and cast-in-place concrete piles. In general, with the rational composite structure the SDCM piles can transmit the applied load effectively, and due to the addition of the stiffer core, the SDCM piles possess high bearing capacity. Based on the findings of these experimental investigations and theoretical analysi , a practical design method is developed to predict the vertical bearing capacity of SDCM pile. 展开更多
关键词 stiffened deep cement mixed pile bearing capacity load transfer mechanism design method
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Bimetallic zeolite imidazolate framework for enhanced lithium storage boosted by the redox participation of nitrogen atoms 被引量:6
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作者 Xiaobing Lou Yanqun Ning +3 位作者 Chao Li Xiaoshi Hu Ming Shen Bingwen Hu 《Science China Materials》 SCIE EI CSCD 2018年第8期1040-1048,共9页
In this work, a bimetallic zeolitic imidazolate framework (ZIF) CoZn-ZIF was synthesized via a facile sol-vothermal approach and applied in lithiumion batteries. The as-prepared CoZn-ZIF shows a high reversible capa... In this work, a bimetallic zeolitic imidazolate framework (ZIF) CoZn-ZIF was synthesized via a facile sol-vothermal approach and applied in lithiumion batteries. The as-prepared CoZn-ZIF shows a high reversible capacity of 605.8 mA b g-i at a current density of 100 mA g^-1, far beyond the performance of the corresponding monometallic Co-ZIF- 67 and Zn-ZIF-8. Ex-situ synchrotron soft X-ray absorption spectroscopy, X-ray diffraction, and electron paramagnetic resonance techniques were employed to explore the Li^storage mechanism. The superior performance of CoZn-ZIF over Co-ZIF-67 and Zn-ZIF-8 could be mainly attributed to lithiation and delithiation of nitrogen atoms, accompanied by the breakage and recoordination of metal nitrogen bond. Morever, a few metal nitrogen bonds without recoordination will lead to the amorphization of CoZn-ZIF and the formation of few nitrogen radicals. 展开更多
关键词 bimetallic zeolitic imidazolate framework lithiumion battery improved capacity mechanism study
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Room-temperature metal-sulfur batteries:What can we learn from lithium-sulfur? 被引量:4
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作者 Hualin Ye Yanguang Li 《InfoMat》 SCIE CAS 2022年第5期139-151,共13页
Rechargeable metal-sulfur batteries with the use of low-cost sulfur cathodes and varying choice of metal anodes(Li,Na,K,Ca,Mg,and Al)represent diverse energy storage solutions to satisfy different application requirem... Rechargeable metal-sulfur batteries with the use of low-cost sulfur cathodes and varying choice of metal anodes(Li,Na,K,Ca,Mg,and Al)represent diverse energy storage solutions to satisfy different application requirements.In comparison to the highly-regarded lithium-sulfur batteries,the use of nonlithium-metal anodes in metal-sulfur batteries offers multiple advantages in terms of abundance,cost,and volumetric energy density.Although with the same sulfur cathode,metal-sulfur batteries show considerably differences in the electrochemical reaction pathway and capacity fading mechanism.Herein,we provide an overview of correlations and differences in metal-sulfur batteries,highlighting the knowledge and experience that can be transplanted from lithium-sulfur to other metal-sulfur batteries.We first discuss the historical development and the electrochemical reaction mechanism of various metal-sulfur batteries.This is then followed by an analysis of key challenges of metal-sulfur batteries including polysulfide shutting,cathode passivation,and anode stability.Finally,a short perspective is presented about the possible future development of metal-sulfur batteries. 展开更多
关键词 capacity fading mechanisms metal-sulfur batteries POLYSULFIDES reaction mechanism
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