Materials
·
2021
·Vol. 14
·期 17
·4895
·
IF 3.623
Linqing Zuo,Haodong Sun,Xinhai Yuan,Juan Wen,Xi Chen,Shiyu Zhou,Yuping Wu,Teunis van Ree
The Zn/MnO2battery is a promising energy storage system, owing to its high energy density and low cost, but due to the dissolution of the cathode material, its cycle life is limited, which hinders its further development. Therefore, we introduced agar as a microskin for a MnO2electrode to improve its cycle life and optimize other electrochemical properties. The results showed that the agar-coating layer improved the wettability of the electrode material, thereby promoting the diffusion rate of Zn2+and reducing the interface impedance of the MnO2electrode material. Therefore, the Zn/MnO2battery exhibited outstanding rate performance. In addition, the agar-coating layer promoted the reversibility of the MnO2/Mn2+reaction and acted as a colloidal physical barrier to prevent the dissolution of Mn2+, so that the Zn/MnO2battery had a high specific capacity and exhibited excellent cycle stability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 17
·2000675
·
IF 16.836
Yang Hu,Wu Tang,Qihang Yu,Xinxin Wang,Wenqiang Liu,Jiahui Hu,Cong Fan
Organic redox-active molecules are inborn electrodes to store large-radius potassium (K) ion. High-performance organic cathodes are important for practical usage of organic potassium-ion batteries (OPIBs). However, small-molecule organic cathodes face serious dissolution problems against liquid electrolytes. A novel insoluble small-molecule organic cathode [ N , N ′-bis(2-anthraquinone)]-perylene-3,4,9,10-tetracarboxydiimide (PTCDI-DAQ, 200 mAh g −1 ) is initially designed for OPIBs. In half cells (1–3.8 V vs K + /K) using 1 m KPF 6 in dimethoxyethane (DME), PTCDI-DAQ delivers a highly stable specific capacity of 216 mAh g −1 and still holds the value of 133 mAh g −1 at an ultrahigh current density of 20 A g −1 (100 C). Using reduced potassium terephthalate (K 4 TP) as the organic anode, the resulting K 4 TP||PTCDI-DAQ OPIBs with the electrolyte 1 m KPF 6 in DME realize a high energy density of maximum 295 Wh kg −1 cathode (213 mAh g −1 cathode × 1.38 V) and power density of 13 800 W Kg −1 cathode (94 mAh g −1 × 1.38 V @ 10 A g −1 ) during the working voltage of 0.2–3.2 V. Meanwhile, K 4 TP||PTCDI-DAQ OPIBs fulfill the superlong lifespan with a stable discharge capacity of 62 mAh g −1 cathode after 10 000 cycles and 40 mAh g −1 cathode after 30 000 cycles (3 A g −1 ). The integrated performance of PTCDI-DAQ can currently defeat any cathode reported in K-ion half/full cells.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2017
·Vol. 5
·期 1
·71-77
·
IF 4.136
Lei Tan,Xinhai Li,Zhixing Wang,Huajun Guo,Jiexi Wang,Liang An
Graphical Divide and conquer : A porous carbon (PC) with a high specific surface area and large pore volume, prepared from an abundant industrial byproduct (coal tar pitch, CTP), is composited with multi-walled carbon nanotubes (MWCNTs) through a heat-treatment method. The PC/MWCNT composite is deposited onto one side of a polypropylene (PP) separator by using a slurry coating method. The modified separator is then applied in Li−S batteries with promising results. An issue associated with lithium−sulfur (Li−S) batteries is polysulfide dissolution, leading to the serious crossover of polysulfide to the Li anode. To address this issue, we report on a multifunctional separator prepared by introducing a porous carbon/multi-walled carbon nanotube (PC/MWCNT) composite into a commercial separator. It shows that the PC/MWCNT composite is able to enhance the interfacial interaction between the coating and the polysulfide and provides a large surface area for absorbing the polysulfide, thus improving the electrical conductivity. It has been demonstrated that the Li−S cell constructed with the PC/MWCNT composite separator results in a reversible capacity as high as 659 mAh g −1 after 200 cycles at 0.5 C, and the average capacity fading rate of the cell is about 0.138 % per cycle. The performance improvement is attributed to a reduction in the crossover rate of polysulfide through the composite separator as a result of the polysulfide absorption by PC/MWCNT layer.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Meichen Guo,Wu Tang,Chenbin Tang,Xuesong He,Cong Fan
Organic cathodes face the challenge of dissolution problem, which severely hinders their electrochemical performances in lithium-ion batteries (LIBs). Herein, a bipolar organic cathode namely [ N , N ′-bis(4-(9H-carbazol-9-yl)phenyl)]-perylene-3,4,9,10-tetracarboxydiimide (PTCDI-DPC, 4-electron C T = 123 mAh g −1 ) is optimized by in-situ electropolymerization to eliminate its dissolution problem, and thus the good cathode performance of the electropolymerized PTCDI-DPC can be fully released in LIBs. In half cells, PTCDI-DPC delivers a peak specific capacity of 164 mAh g −1 and the good retention of 96 % over 450 cycles. Meanwhile, PTCDI-DPC still remains 121 mAh g −1 after 2000 cycles at 1 A g −1 , and a superior rate performance of 98 mAh g −1 at 8 A g −1 . Furthermore, the fabricated 2PF 6 -PTCDI-DPC||LiC 6 Li-ion full cells can possess the peak discharge capacity of 157 mAh g −1 cathode and a high energy density of 385 Wh kg −1 cathode in 1.4–4.3 V, with 90 % capacity retention during 2000 cycles at 1 A g −1 . As far as we know, the cathode performance of the improved PTCDI-DPC is one of the best among bipolar organic cathodes reported for LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Batteries-Basel
·
2023
·Vol. 9
·期 2
·85
·
IF 4
Pengfei Xu,Xiao Jin,Biao Zhang,Xin Wang,Dong Liu
Organic electrode materials have received increasing attention in rechargeable batteries due to their earth abundance and variable structures. However, the practical application of most organic electrode materials is limited by the high solubility in the electrolyte. Herein, an insoluble amino-functionalized hexaazatriphenylene (defined as HATN-[NH2]3) in the electrolyte is developed as stable organic cathode material for lithium-ion batteries (LIBs). The resultant HATN-[NH2]3electrode achieves a high reversible capacity of 192.5 mAh g−1at a current density of 0.05 A g−1. Remarkably, the electrode exhibits almost no capacity fade after 500 cycles at 0.5 A g−1. The high stability can be ascribed to insoluble property caused by hydrogen bonds between HATN-[NH2]3molecules. Moreover, density functional theory calculations suggest that amino functionalization can reduce the band gap of HATN, in favor of improved conductivity and thus enhanced rate performance. This work offers a simple but efficient strategy to develop stable organic electrode materials in LIBs and beyond.Keywords:amino functionalization;hexaazatriphenylene derivative;dissolution issue;organic cathode;lithium-ion batteries
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）