Advanced Energy Materials
·
2025
·Vol. 15
·期 36
·e02595
·
IF 26
Xiang Ji,Yi Li,Yanlong Wang,Jian Jiang,Maowen Xu,Jianhui Zhu
Rechargeable Fe-ion batteries with overwhelming cost/environmental benign superiorities hold great promise in large-scale charge-storage applications. However, there is still a lack of competitive cathodes with prominent capacity and long-term cyclability. To overcome these constraints, a unique Fe 2+ /NH 4 + co-insertion strategy is proposed, enabling both doubled reversible capacity and cyclic life of Berlin green (FeHCF) cathodes. The Fe 2+ insertion proves to induce FeHCF lattice contractions, alter ligand environment/activation energies of low-spin Fe III, and hence boost the redox conversion depth, while NH 4 + co-insertions help to elevate the cathode capacities by utilizing Fe 2+ -unoccupied reaction sites. Besides, they generate hydrogen bonds between inserted NH 4 + ions and N atoms in FeHCF, capable of vastly strengthening the cathode's cyclic durability. Cathodes in such collaborative dual-cation electrolytes exhibit a remarkable capacity of 162 mAh g −1 (4 A g −1 ) and far prolonged operation lifespan (over 1000 cycles) when compared to single-cation cases. The assembled full cells demonstrate impressive energy densities up to 70.4 Wh kg −1 , and far superior capacity retention of 88% after all the cycling. This work may offer a simple/feasible, and effective route to render high-capacity and long-lasting cathodes for future/practical Fe-ion battery systems.
研究领域:
储能
·
电化学
·
材料科学
·
电池技术
·
可持续能源
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2021
·
IF 17.789
Yingjie Gao,Gaofeng Li,Feng Wang,Jun Chu,Pu Yu,Baoshan Wang,Hui Zhan,Zhiping Song
In spite of the recent rapid progress of organic cathode materials for aqueous rechargeable zinc batteries (ARZBs), there are still many challenges such as unaffordable synthesis, unsatisfactory electrochemical performance, and unclear mechanisms in this field. Herein, we report 5,7,12,14-tetraaza-6,13-pentacenequinone (TAPQ) as an easily-synthesized organic cathode material with a novel quinone/pyrazine hybrid structure. Benefitting from the multiple electroactive C=O and C=N bonds, TAPQ possessed a theoretical capacity of 515 mAh g –1 (based on a six-electron reaction) and a practically reversible capacity of 443 mAh g –1 within 0.1–1.6 V vs. Zn 2+ /Zn, both of which set new records for organic cathodes in ARZBs. The H + /Zn 2+ co-insertion mechanism involving H + as the predominant participant was confirmed by detailed investigations including various ex-situ characterizations, electrochemical tests, and DFT calculations. Based on the clear mechanism understanding, a modified voltage range of 0.5–1.6 V was adopted to simultaneously achieve high energy density (270 mAh g –1 × 0.84 V = 227 Wh kg –1 ) and excellent cycling stability (capacity retention of 92% after 250 cycles under 50 mA g –1 , with an average Coulombic efficiency of 99.96%). Furthermore, the evolution mechanism of TAPQ electrode structure during cycling was also carefully studied to reveal the origin of capacity decline. The novel molecular structure, easy synthesis, superior electrochemical performance, and deeper mechanism understanding provide researchers important insights into the further development of organic cathode materials for ARZBs toward practical applications.
研究领域:
储能与转换
·
材料科学
·
电化学
·
有机电极材料
·
电池技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiaowen Chen,Zihan Xu,Sai Guo,Bo Sun,Qijian Li,Qingkun Meng,Fuxiang Wei,Jiqiu Qi,Yanwei Sui,Peng Cao
Improving electrical conductivity and increasing the active site are important directions for improving the technology of manganese-based cathode materials for zinc ion batteries (ZIBs). In this paper, cobalt-doped and oxygen-vacancy coupled MnO2 nanorods (Vo-CMO) were prepared by defect engineering and an ion doping strategy as cathode materials for rechargeable ZIBs. Oxygen vacancies can increase the defect density of the material and provide more migration paths for zinc ions, thereby increasing the electrochemical activity and improving the specific capacity. The introduction of cobalt can adjust the electronic structure of manganese oxide, change the Fermi level of the material, and promote the generation and transmission of charge carriers, thereby increasing the charge transfer rate and increasing the conductivity of the material. The synergistic effect among them can improve the diffusion kinetics of zinc ions, thereby increasing the capacity and cycle stability of the material. The Vo-CMO has better Zn2+ storage capacity of 295.6 mAh·g–1 at 0.1 A·g–1. The reaction mechanism of Vo-CMO material was H+/Zn2+ coinsertion through galvanostatic current intermittent titration (GITT) and ex situ experiments. In addition, the Vo-CMO material assembled the flexible quasi-solid ZIB. The synergistic effect of cobalt doping and oxygen vacancy can provide a new way to develop water-based ZIBs.
研究领域:
材料科学
·
电化学
·
储能
·
纳米材料
·
电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）