Browsing by Author "Gu, Zhen-Yi"
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- PublicationOpen AccessAn advanced cathode composite design for co-utilization of cations and anions in lithium batteries(2021)
;Wang, Xiao-Tong; ;Guo, Jin-Zhi ;Gu, Zhen-Yi; ;Sun, Zhong-Hui ;Li, Wen-Hao ;Liang, Hao-JieWu, Xing-LongAnions in the electrolyte are usually ignored in conventional "rocking-chair" batteries because only cationic de-/intercalation is considered. An ingenious scheme combining LiMn0.7Fe0.3PO4 (LMFP@C) and graphite as a hybrid cathode for lithium-ion batteries (LIBs) is elaborately designed in order to exploit the potential value of anions for battery performance. The hybrid cathode has a higher conductivity and energy density than any of the individual components, allowing for the co-utilization of cations and anions through the de-/intercalation of Li+ and PF6− over a wide voltage range. The optimal compound with a weight mix ratio of LMFP@C: graphite= 5: 1 can deliver the highest specific capacity of nearly 140 mA h/g at 0.1 C and the highest voltage plateau of around 4.95 V by adjusting the appropriate mixing ratio. In addition, cyclic voltammetry was used to investigate the electrode kinetics of Li+ and PF6- diffusion in the hybrid compound at various scan rates. In situ X-ray diffraction is also performed to further demonstrate the structural evolution of the hybrid cathode during the charge/discharge process.WOS© Citations 67Scopus© Citations 74 345 29 - PublicationMetadata onlyAdvanced layered oxide cathodes for sodium/potassium-ion batteries: Development, challenges and prospects(2023)
;Huang, Zhixiong ;Gu, Zhen-Yi ;Heng, Yong-Li; ;Geng, HongboWu, Xing-LongRapid exploitation of renewable energy sources for replacing the conventional fossil fuels drives the development of electrical energy storage (EES) systems. Sodium-ion batteries (NIBs) and potassium-ion batteries (KIBs) are considered as the promising low-cost candidates for the application in large-scale energy storage by virtue of the abundant reserves of sodium and potassium resources. In NIBs and KIBs, cathode plays a critical role in the electrochemical performances, and hence searching for appropriate cathode materials becomes the key point. Particularly, layered oxide cathodes with superior specific capacity and appropriate operating voltage are the most fascinating electrode materials for NIBs and KIBs. In light of performances, the fundamental and recent researches of layered oxide cathodes are reviewed for NIBs and KIBs. However, several major challenges including irreversible phase transition, low energy density, poor air stability, oxygen redox chemistry and inferior cycling stability need to be overcome. All in all, a comprehensive review for the layered oxide cathodes is present accompanied with solutions for these problems, especially mentioning the different functions of different elements and ionic potential (Ф) for guiding the design of layer oxides with exceptional performances. The challenges and prospects are also included with the hope of these materials applying in the next-generation energy storage devices.WOS© Citations 47Scopus© Citations 59 60 - PublicationMetadata onlyAdvanced polyanionic electrode materials for potassium-ion batteries: Progresses, challenges and application prospects(2022)
;Zhang, Kai-Yang ;Gu, Zhen-Yi; ;Guo, Jin-Zhi ;Wang, Xiao-Tong ;Wang, YinglinWu, Xing-LongAlthough potassium-ion batteries (KIBs) are considered a very promising energy storage system, their development for actual application still has a long way to go. Advanced electrode materials, as a fundamental component of KIBs, are essential for optimizing electrochemical performance and promoting effective energy storage. Due to their unique structural benefits in terms of cycle capability, strong ionic conductivity, and tunable operating voltage, polyanionic compounds are one type of viable electrode material for manufacturing high-performance KIBs. The huge size of K+ ion, on the other hand, places great demands on polyanionic materials, which must be able to withstand severe structural deformation during K+ intercalation/delamination. To maintain steady electrochemical performance, it is critical to follow the appropriate design guidelines for electrode materials. This paper provides a summary of current advancements in polyanionic compound for KIBs, with a focus on electrode material structural design. The effects of various parameters on electrochemical performance are examined and summarized. In addition, various viable solutions are proposed to address the impending issues posed by polyanionic compounds for KIBs, with the hope of providing a clearer picture of the field's future development path.WOS© Citations 77Scopus© Citations 84 61 - PublicationMetadata onlyDefect engineering unveiled: Enhancing potassium storage in expanded graphite anode(Elsevier, 2024)
;Zhang, Kai-Yang ;Liu, Han-Hao ;Su, Meng-Yuan ;Yang, Jia-Lin ;Wang, Xiao-Tong; ;Gu, Zhen-Yi ;Zheng, Shuo-Hang ;Heng, Yong-Li ;Liang, Hao-Jie ;Wang, Yinglin ;Li, ShuyingWu, Xing-LongExpanded graphite (EG) stands out as a promising material for the negative electrode in potassium-ion batteries. However, its full potential is hindered by the limited diffusion pathway and storage sites for potassium ions, restricting the improvement of its electrochemical performance. To overcome this challenge, defect engineering emerges as a highly effective strategy to enhance the adsorption and reaction kinetics of potassium ions on electrode materials. This study delves into the specific effectiveness of defects in facilitating potassium storage, exploring the impact of defect-rich structures on dynamic processes. Employing ball milling, we introduce surface defects in EG, uncovering unique effects on its electrochemical behavior. These defects exhibit a remarkable ability to adsorb a significant quantity of potassium ions, facilitating the subsequent intercalation of potassium ions into the graphite structure. Consequently, this process leads to a higher potassium voltage. Furthermore, the generation of a diluted stage compound is more pronounced under high voltage conditions, promoting the progression of multiple stage reactions. Consequently, the EG sample post-ball milling demonstrates a notable capacity of 286.2 mAh g-1 at a current density of 25 mA g−1, showcasing an outstanding rate capability that surpasses that of pristine EG. This research not only highlights the efficacy of defect engineering in carbon materials but also provides unique insights into the specific manifestations of defects on dynamic processes, contributing to the advancement of potassium-ion battery technology.2 - PublicationOpen AccessPearl-structure-enhanced NASICON cathode toward ultrastable sodium-ion batteries(2023)
;Zhao, Xin-Xin ;Fu, Wangqin ;Zhang, Hong-Xia ;Guo, Jin-Zhi ;Gu, Zhen-Yi ;Wang, Xiao-Tong ;Yang, Jia-Lin ;Lu, Hong-Yan ;Wu, Xing-LongBased on the favorable ionic conductivity and structural stability, sodium superionic conductor (NASICON) materials especially utilizing multivalent redox reaction of vanadium are one of the most promising cathodes in sodium-ion batteries (SIBs). To further boost their application in large-scale energy storage production, a rational strategy is to tailor vanadium with earth-abundant and cheap elements (such as Fe, Mn), reducing the cost and toxicity of vanadium-based NASICON materials. Here, the Na3.05V1.03Fe0.97(PO4)3 (NVFP) is synthesized with highly conductive Ketjen Black (KB) by ball-milling assisted sol-gel method. The pearl-like KB branch chains encircle the NVFP (p-NVFP), the segregated particles possess promoted overall conductivity, balanced charge, and modulated crystal structure during electrochemical progress. The p-NVFP obtains significantly enhanced ion diffusion ability and low volume change (2.99%). Meanwhile, it delivers a durable cycling performance (87.7% capacity retention over 5000 cycles at 5 C) in half cells. Surprisingly, the full cells of p-NVFP reveal a remarkable capability of 84.9 mAh g−1 at 20 C with good cycling performance (capacity decay rate is 0.016% per cycle at 2 C). The structure modulation of the p-NVFP provides a rational design on the superiority of others to be put into practice.WOS© Citations 11Scopus© Citations 15 37 - PublicationMetadata onlyProspects and perspectives on advanced materials for sodium-ion batteries(Elsevier, 2023)
;Gu, Zhen-Yi ;Wang, Xiao-Tong ;Heng, Yong-Li ;Zhang, Kai-Yang ;Liang, Hao-Jie ;Yang, Jia-Lin; ;Wang, Peng-Fei ;You, Ya ;Du, FeiWu, Xing-LongWOS© Citations 5Scopus© Citations 12 6 - PublicationMetadata onlyProspects for managing end-of-life lithium-ion batteries: Present and future(2022)
;Wang, Xiao-Tong ;Gu, Zhen-Yi; ;Zhao, Xin-Xin ;Wu, Xing-LongLiu, YichunThe accelerating electrification has sparked an explosion in lithium-ion batteries (LIBs) consumption. As the lifespan declines, the substantial LIBs will flow into the recycling market and promise to spawn a giant recycling system. Nonetheless, since the lack of unified guiding standard and nontraceability, the recycling of end-of-life LIBs has fallen into the dilemma of low recycling rate, poor recycling efficiency, and insignificant benefits. Herein, tapping into summarizing and analyzing the current status and challenges of recycling LIBs, this outlook provides insights for the future course of full lifecycle management of LIBs, proposing gradient utilization and recycling-target predesign strategy. Further, we acknowledge some recommendations for recycling waste LIBs and anticipate a collaborative effort to advance sustainable and reliable recycling routes.WOS© Citations 41 238 - PublicationMetadata onlyStructural regulation of coal-derived hard carbon anode for sodium-ion batteries via pre-oxidation(Springer, 2024)
;Su, Meng-Yuan ;Zhang, Kai-Yang; ;Zhang, Xue-Li ;Liu, Yan-Ning ;Yang, Jia-Lin ;Gu, Zhen-Yi ;Butt, Faaz A.Wu, Xing-LongHard carbon (HC) is broadly recognized as an exceptionally prospective candidate for the anodes of sodium-ion batteries (SIBs), but their practical implementation faces substantial limitations linked to precursor factors, such as reduced carbon yield and increased cost. Herein, a cost-effective approach is proposed to prepare a coal-derived HC anode with simple pre-oxidation followed by a post-carbonization process which effectively expands the d002 layer spacing, generates closed pores and increases defect sites. Through these modifications, the resulting HC anode attains a delicate equilibrium between plateau capacity and sloping capacity, showcasing a remarkable reversible capacity of 306.3 mAh·g−1 at 0.03 A·g−1. Furthermore, the produced HC exhibits fast reaction kinetics and exceptional rate performance, achieving a capacity of 289 mAh·g−1 at 0.1 A·g−1, equivalent to ~ 94.5% of that at 0.03 A·g−1. When implemented in a full cell configuration, the impressive electrochemical performance is evident, with a notable energy density of 410.6 Wh·kg−1 (based on cathode mass). In short, we provide a straightforward yet efficient method for regulating coal-derived HC, which is crucial for the widespread use of SIBs anodes.7 - PublicationMetadata onlyWaste utilization of crab shell: 3D hierarchical porous carbon towards high-performance Na/Li storage(2021)
;Wang, Xiao-Tong ;Yu, Hai-Yue ;Liang, Hao-Jie ;Gu, Zhen-Yi ;Nie, Ping ;Wang, Hao-Yu ;Guo, Jin-Zhi; Wu, Xing-LongThe reuse of waste biomass has received more and more attention in recent years due to resource and environmental problems. The development of green, environmentally friendly and cost-effective electrode materials for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) is currently the focus of research as key electrochemical energy storage systems. Herein, a facile strategy is adopted to prepare 3D hierarchical porous carbon anodes for LIBs/SIBs by taking advantage of waste crab shells and iron p-toluenesulfonate. The results show that the reversible specific capacity of the prepared anode could reach 703.2 mAh g−1 in LIBs and 283.2 mAh g−1 in SIBs when the current density is 0.05 A g−1. In addition, the contributions of pseudocapacitance, the kinetic characteristics and the storage mechanisms of lithium/sodium ions are investigated through cyclic voltammetry (CV) and galvanostatic intermittent titration techniques (GITTs). Due to the unique structure, the obtained material displays an excellent electrochemical performance, which lays the foundation for the improvement in the performance of waste biomass in LIBs/SIBs.WOS© Citations 6Scopus© Citations 6 18