| 1 | Enhanced room-temperature Naþionic conductivity in Na_(4.92)Y_(0.92)Zr_(0.08)Si_(4)O_(12)显示文摘Developing cost-effective and reliable solid-state sodium batteries with superior performance is crucial for stationary energy storage.A key component in facilitating their application is a solid-state electrolyte with high conductivity and stability.Herein,we employed aliovalent cation substitution to enhance ionic conductivity while preserving the crystal structure.Optimized substitution of Y^(3+)with Zr^(4+)in Na_(5)YSi_(4)O_(12) introduced Naþion vacancies,resulting in high bulk and total conductivities of up to 6.5 and 3.3 mS cm^(-1),respectively,at room temperature with the composition Na_(4.92)Y_(0.92)Zr_(0.08)Si_(4)O_(12)(NYZS).NYZS shows exceptional electrochemical stability(up to 10 V vs.Naþ/Na),favorable interfacial compatibility with Na,and an excellent critical current density of 2.4 mA cm^(-2).The enhanced conductivity of Naþions in NYZS was elucidated using solid-state nuclear magnetic resonance techniques and theoretical simulations,revealing two migration routes facilitated by the synergistic effect of increased Naþion vacancies and improved chemical environment due to Zr^(4+)substitution.NYZS extends the list of suitable solid-state electrolytes and enables the facile synthesis of stable,low-cost Naþion silicate electrolytes. | Aikai Yang Kai Yao Mareen Schaller Enkhtsetseg Dashjav Hang Li Shuo Zhao Qiu Zhang Martin Etter Xingchen Shen Huimin Song Qiongqiong Lu Ruijie Ye Igor Moudrakovski Quanquan Pang Sylvio Indris Xingchao Wang Qianli Ma Frank Tietz Jun Chen Olivier Guillon | 2023 | eScience2023，3，6： | 0 |
| 2 | Charge storage mechanisms of cathode materials in rechargeable aluminum batteries显示文摘Rechargeable aluminum batteries(RABs)have attracted great interest as one of the most promising candidates for large-scale energy storage because of their high volumetric capacity,low cost,high safety and the abundance of aluminum.However,compared with the aluminum anodes,the cathode materials face more problems including low specific capacity,relatively sluggish kinetics in most host structures and/or limited cycle lifespan,which pose the major challenge for RABs in further practical applications.During the past years,intensive efforts have been devoted to developing new cathode materials and/or designing engineered nanostructures to greatly improve RABs’electrochemical performances.In addition to nanotechnologybased electrode structure designs,the intrinsic chemical structures and charge storage mechanisms of cathode materials play an equally crucial role,if not more,in revolutionizing the battery performances.This review,here,focuses on current understandings into the charge storage mechanisms of cathode materials in RABs from a chemical reaction point of view.First,the fundamental chemistry,charge storage mechanisms and design principles of RAB cathode materials are highlighted.Based on different ion charge carriers,the current cathode materials are classified into four groups,including Al^(3+)-hosting,Al Cl_(4)^(-)-hosting,Al Cl_(2)^(+)/Al Cl_(2)^(+)-hosting,and Cl^(-)-hosting cathode materials.Next,the respective typical electrode structures,optimization strategies,electrochemical performances and charge storage mechanisms are discussed in detail to establish their chemistry-structure-property relationships.This review on current understandings of the cathode charge storage mechanisms will lay the ground and hopefully set new directions into the rational design of high-performance cathode materials in RABs,and open up new opportunities for designing new electrolyte systems with respect to the targeted cathode systems. | Jiashen Meng Lujun Zhu Aderemi B.Haruna Kenneth I.Ozoemena Quanquan Pang | 2021 | Science China Chemistry2021，64，11： | 0 |
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