Carbon Energy
·
2024
·
IF 19.5
Wenfeng Wang,Lu Zhang,Zeang Duan,Ruyue Li,Jiajin Zhao,Longteng Tang,Yiming Sui,Yadi Qi,Shumin Han,Chong Fang,Desong Wang,Xiulei Ji
Rechargeable aqueous zinc batteries are promising for large-scale energy storage due to their low cost and high safety; however, their energy density has reached the ceiling based on conventional cathodes with a single cationic redox reaction mechanism. Herein, a highly reversible cathode of typical layered vanadium oxide is reported, which operates on both the cationic redox couple of V 5+ /V 3+ accompanied by the Zn 2+ storage and the anionic O – /O 2– redox couple by anion hosting in an aqueous deep eutectic solvent electrolyte. The reversible oxygen redox delivers an additional capacity of ∼100 mAh g –1 at an operating voltage of ∼1.80 V, which increases the energy density of the cathode by ∼36%, endowing the cathode system a record high energy density of ∼506 Wh kg –1 . The findings highlight new opportunities for the design of high-energy zinc batteries with both Zn 2+ and anions as charge carriers.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2023
·Vol. 13
·期 27
·2300746
·
IF 27.8
Yaoshen Niu,Zilin Hu,Bo Zhang,Dongdong Xiao,Huican Mao,Lin Zhou,Feixiang Ding,Yuan Liu,Yang Yang,Juping Xu,Wen Yin,Nian Zhang,Zhiwei Li,Xiqian Yu,Hao Hu,Yaxiang Lu,Xiaohui Rong,Ju Li,Yong-Sheng Hu
Na-ion batteries (NIBs) are promising for grid-scale energy storage applications. However, the lack of Co, Ni-free cathode materials has made them less cost-effective. In this work, Mg 2+ is successfully utilized to activate the oxygen redox reaction in earth-abundant Fe/Mn-based layered cathodes to achieve reversible hybrid anionic and cationic redox capacities. A high first charge capacity of ≈210 mAh g −1 with balanced charge–discharge efficiency is achieved without O-loss, showing a promising energy cost of $2.02 kWh −1 . Full cell against hard carbon anode without pre-sodiation shows energy density exceeding ≈280 Wh kg −1 with a decent capacity retention of 85.6% after 100 cycles. A comprehensive analysis of the charge compensation mechanisms and structural evolution is conducted. Voltage and capacity loss resulting from partially reversible Fe 3+ migration to the Na layer is confirmed, shedding light on further improvements for low-cost NIB cathodes in application scenarios.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yueyue He,Wei Xiang,Genpin Lv,YanJun Zhong,Yang Song,Kun Zhou,Zhenguo Wu,Jun Zhang,Erqiang Yang,Xiaodong Guo
The recent discovery of fast Li-ion transport networks in Li-rich disordered rock-salt (DRX) cathodes expands vastly composition space of high-energy–density cathode materials. Despite numerous Nb, Mo and W based DRX materials have been reported, high energy density DRX materials with composition of inexpensive, eco-friendly and earth abundant elements still urgently need to be developed. Herein, a promising set of Ti based oxyfluorides Li 2 Ti 1/3 Ni 1/3 M 1/3 O 2 F (M = Mn, Fe), which contain high voltage Ni 2+ /Ni 4+ redox couple and low-cost redox couple with Fe and Mn were successfully synthesized. Benefited from the stable Ni 2+ / 4+ and Mn 3+ / 4+ redox and moderated anion redox, Li 2 Ti 1/3 Ni 1/3 Mn 1/3 O 2 F oxyfluoride exhibits high discharge capacities of 285.3 mAh g −1 and energy content of 909.5 Wh kg −1 as well as relatively stable cyclability. Especially, high discharge capacity of 215 mAh g −1 above 3 V acquired by coordination utilization of cation and anion redox for Li 2 Ti 1/3 Ni 1/3 Mn 1/3 O 2 F endows the oxyfluoride with high energy quality, showing enormous potential for practical utilization in the future. For Li 2 Ti 1/3 Ni 1/3 Fe 1/3 O 2 F, the poor reversibility of Ni 2+ /Ni 4+ redox and much higher oxygen charge redox are the main reasons for the much worse capacity retention, and the activation of Fe 2+ /Fe 3+ redox at low voltage partially contributes to the decreased discharge voltage. Density-functional theory calculation reveals that localized oxygen 2p orbital of Li 2 Ti 1/3 Ni 1/3 Fe 1/3 O 2 F is closer to the Fermi level than that of Li 2 Ti 1/3 Ni 1/3 Mn 1/3 O 2 F, which would ultimately lead to much higher content of oxygen redox and relatively lower capacity retention. The synergistic utilization of multiple cation redox reservoirs which consist of high voltage redox couple and low-cost redox couple, and small quantity of O redox centers to construct high energy quality DRX materials would provide new reference for developing other cathodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 3
·2305194
·
IF 19
Weiqin Chu,Xu Zhang,Shu Zhao,Mingxue Tang,Shuaixia Li,Shiqi Liu,Haijun Yu
The high-voltage stability of electrolytes profoundly determines electrochemical reactions, which is still one of the major obstacles for developing advanced Al-ion batteries (AIBs). Herein, a fluorine-adjustment strategy is proposed to improve the high-voltage stability of a low-cost AlCl 3 /acetamide (AcA) deep eutectic solvent electrolyte. By using a fluorine-substituted AcA additive, the AlCl 3 /AcA electrolyte exhibits a lifted oxidation onset potential from 2.21 to 2.78 V versus Al 3+ /Al. Based on a series of structural investigations, it is found that the additive can adjust the coordination configurations and improve the anti-oxidation capability of electrolytes. Moreover, the additive induces an F-rich interphase layer, which can stabilize the plating/stripping reactions of Al electrode with accelerated kinetics. Based on the optimized electrolyte, a high-voltage Al–S battery relying on the S cationic redox shows good performance with little voltage fading for 300 cycles. This study provides important insights into the exploration of high-performance and low-cost electrolytes for AIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）