Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 37
·19852-19858
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IF 14.511
Yunlong Zhang,Yanan Li,Xiaoshan Wang,Xiaoling Teng,Lu Guan,Hao Yang,Zhengqiu He,Yi Wan,Shiwei Guo,Han Hu,Mingbo Wu
The introduction of redox mediators, for example lithium iodide (LiI), into the catholyte of lithium-ion capacitors (LICs) could provide extra capacity through the iodide-involved redox reactions, allowing an alternative strategy to balance the huge capacity gap between the cathode and anode. Nevertheless, the formidable shuttle effect of the soluble mediators results in deteriorated cycling life. Herein, a metal–organic framework (MOF) interlayer is introduced to prohibit shuttling via physical obstruction and mild chemical attraction. After loading the MOF particles on the separator, the micropore of the MOFs could restrict the intragranular diffusion of the redox mediators while their intergranular migration could be prohibited by the mild chemical adsorption exerted by the MOF particles. The electrochemical evaluation reveals that the employment of the MOF-modified separator could boost the coulombic efficiency and cycling life of the activated carbon (AC) cathode with the LiI-included catholyte. Based on this discovery, a LIC was constructed by pairing the AC cathode with the LiI-involved catholyte and nanostructured Li2TiSiO5 anode at the same mass loading where the MOF-modified separator is employed to prohibit the shuttle of iodine species. Because of the synergistic effects, such a LIC could offer a high energy, large power density, and long cycling life.
研究领域:
材料科学
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电化学
·
能源存储
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Wei-Wei Wang,Yu Gu,Chen-Xi Liu,Jiawei Yan,Bing-Wei Mao
The morphology of Li deposition has a profound effect on the cycling performance of a Li-metal battery. However, in situ research studies on the targeted regulation of Li deposition behavior and exploration of the thermodynamic and kinetic factors affecting Li deposition morphology are quite limited. Herein, we employ in situ atomic force microscopy (AFM) to investigate the effects of lithium iodide (LiI) additive on the evolution of Li deposition morphology in propylene carbonate (PC)-based electrolyte. The spherical Li deposits formed via three-dimensional (3D) nucleation and growth partially transform into planar morphology after the addition of 10 mM LiI, leading to a combined 3D nucleation and quasi-two-dimensional (2D) growth behavior. Complemented by X-ray photoelectron spectroscopy (XPS) profiling analysis and AFM nanomechanical characterization, the composition, structure, and properties of solid electrolyte interphases (SEIs) are comprehensively inspected. The SEI formed in the LiI-containing electrolyte bears an inorganic–organic hybrid structure with improved mechanical flexibility, compared with the rigid and thick SEI formed in the basic electrolyte. Meanwhile, the possible interfacial adsorption of Ĩ– contributes to the uniform distribution of Li+ and rapid diffusion of the Li atom. This work reveals the importance of an additive in regulating the Li deposition behavior, which is helpful in improving the Li-metal battery performance.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2018
·Vol. 5
·期 13
·1702-1707
·
IF 4.446
Jiaqi Wang,Junxiang Liu,Yichao Cai,Fangyi Cheng,Zhiqiang Niu,Jun Chen
Graphical Right off the batt : A Li@Super P composite anode with a high specific surface area is fabricated through a low-cost brushing method, which effectively decreases the interface impedance and overpotential of Li depositing/stripping. The anode can also mitigate the detrimental shuttling effect of I 3 − generated from LiI during the charging process. The combination of the protected Li anode and LiI mediator delivers superior Li−O 2 battery performance. Rechargeable Li−O 2 batteries represent a highly attractive battery technology, owing to a high theoretical energy density of 3500 Wh kg −1 , but they suffer from large charging polarization and lithium anode degradation on cycling. Herein, we report a Li−O 2 battery system with reduced polarization and a long lifespan, which is realized by using a novel Li@Super P composite anode integrated with lithium iodide in ether-based electrolyte. Coating a Super P carbon layer, with an optimal thickness of approximately 30 μm, onto the lithium anode results in a lowered interface impedance and a decreased Li depositing/stripping overpotential (<15 mV) over 300 cycles at 0.3 mA cm −2 . The Li−O 2 batteries assembled with the Li@Super P anode and LiI additive could mitigate the detrimental shuttling effect of I 3 − and deliver a high reversible capacity of 1000 mAh g −1 with a median charge voltage lower than 3.3 V after 50 cycles. This study provides a simple yet effective way to protect the lithium anode and design high-performance Li−O 2 batteries.
研究领域:
材料科学
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电化学
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电池技术
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 12
·120535
·
IF 4.316
Jie Chen,Bin He,Zexiao Cheng,Zhixiang Rao,Danqi He,Dezhong Liu,Xiang Li,Lixia Yuan,Yunhui Huang,Zhen Li
Anode-free Li metal batteries are considered the ultimate configuration for next-generation high energy-density Li-based batteries due to the elimination of excess Li metal. However, the limited Li source aggravates issues such as dendrite growth and “dead” Li formation. Any Li loss caused by the SEI formation and dead Li has a great influence on the performance of the full cell. Here, we introduce LiI with shuttle effect to suppress the Li dendrites and reactivate the dead Li in the anode-free LiFePO4 (LFP) ∣Cu full cells. During cycling, the iodine transforms between I− and I3−, and a chemical reactions occur spontaneously between I3− and Li dendrites or dead Li. The generated Li+ in the electrolyte remains active in the following cycling. The anode-free LFP∣Cu cells deliver an initial discharge capacity of 139 mAh g−1 and maintain capacities of 100 mAh g−1 with a capacity retention of 72% after 100 cycles. Both the anode-free LFP∣Cu coin cells and pouch cells with LiI additive show much-improved performances. This work provides a new strategy for high-performance anode-free Li metal batteries.
研究领域:
电化学储能
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材料科学
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能源化学
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电池技术
✓ 已验证
DOI
高影响因子
Small
·
2024
·
IF 13
Zhiying Gao,Jingming Yao,Jitong Yan,Jun Sun,Congcong Du,Qiushi Dai,Yong Su,Jun Zhao,Jingzhao Chen,Xiaomei Li,Hui Li,Pan Zhang,Jun Ma,Hailong Qiu,Liqiang Zhang,Yongfu Tang,Jianyu Huang
Rechargeable aprotic lithium (Li)-oxygen battery (LOB) is a potential next-generation energy storage technology because of its high theoretical specific energy. However, the role of redox mediator on the oxide electrochemistry remains unclear. This is partly due to the intrinsic complexity of the battery chemistry and the lack of in-depth studies of oxygen electrodes at the atomic level by reliable techniques. Herein, cryo-transmission electron microscopy (cryo-TEM) is used to study how the redox mediator LiI affects the oxygen electrochemistry in LOBs. It is revealed that with or without LiI in the electrolyte, the discharge products are plate-like LiOH or toroidal Li 2 O 2 , respectively. The I 2 assists the decomposition of LiOH via the formation of LiIO 3 in the charge process. In addition, a LiI protective layer is formed on the Li anode surface by the shuttle of I 3 − , which inhibits the parasitic Li/electrolyte reaction and improves the cycle performance of the LOBs. The LOBs returned to 2e − oxygen reduction reaction (ORR) to produce Li 2 O 2 after the LiI in the electrolyte is consumed. This work provides new insight on the role of redox mediator on the complex electrochemistry in LOBs which may aid the design LOBs for practical applications.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Yingxin Lin,Zhipeng Wen,Jiaxiang Liu,Dongzheng Wu,Peng Zhang,Jinbao Zhao
The metallic lithium (Li) is the ultimate option in the development of anodes for high-energy secondary batteries. Unfortunately, inferior cycling reversibility and Li dendrites growth of Li metal as anode enormously impede its commercialization. Here, a uniform LiI protective layer is constructed on Li metal anode via a facile and direct solid–gas reaction of Li metal with iodine vapor. The pre-constructed LiI layer possesses more steadily and faster Li ion transport than the conventional SEI layer and contributes to a steady interface for the Li metal anode, which affords a smooth Li deposition morphology without Li dendrites formation. The symmetrical cell with the Li metal anode protected by LiI layer exhibits a longer cycling lifetime of over 700 h at a current density of 1 mA cm −2 with Li plating capacity of 1 mAh cm −2 . Moreover, the LiI layer protected Li metal anode can still remain high capacity retention of 74.6% after 500 cycles in the full cell paired with NCM523 cathode. The work proposes an easy and effective method to fabricate a uniform and stable protective layer on the Li metal anode and offers a practicable thinking for the commercial implementation of Li metal batteries.
研究领域:
材料科学
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电化学
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能源存储
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纳米材料
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电池技术
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界面化学
✓ 已验证
DOI
高影响因子
Nature Photonics
·
2024
·
IF 32.3
Liu Lang,Liu Shi-Yu,Shi Yuanpeng,Fang Cui-Ling,Zhao Shan,Shen Huai-Yi,Chen Ming-Xing,Wang Ze-Jie,Ma Yan,Liu Yan,Feng Yan,Tang Jiang,Ye Heng-Yun,Niu Guangda
Halide perovskites have shown promising potential for direct X-ray detection due to their high X-ray absorption coefficient, low trap states and convenient fabrication process. However, it is still a challenge to achieve high sensitivity, low dark current and low detection limit in a single material. The deep reason for this is the trade-off between the material’s μτ product and resistivity. Here we report the construction of an organic–inorganic hybrid anti-perovskite ((2-Habch) 3 Cl(PtI 6 )) with indirect transition and low orbital symmetry at the band edge to achieve an ultralong intrinsic lifetime and thus break the trade-off. (2-Habch) 3 Cl(PtI 6 ) achieves an unprecedented long carrier lifetime of >3 ms, leading to a large μτ product of 6.25 × 10 −3 cm 2 V −1 and high resistivity of 10 12 Ω cm, outperforming most X-ray detection materials. These properties enabled the development of X-ray detectors that simultaneously achieve an ultralow dark current of 0.21 nA cm −2 , high sensitivity of 1.0 × 10 4 µC Gy air −1 cm −2 , ultralow detection limit of 2.4 nGy air s −1 and excellent operational stability with no observable baseline drift, outperforming state-of-the-art perovskite single-crystal detectors. The rare combination of high performance in almost every figure of merit in the anti-perovskite-based X-ray detector could enable new-generation X-ray detection systems.
研究领域:
材料科学
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物理学
·
放射学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bohua Li,Jingning Lai,Fengling Zhang,Wen Sun,Zhengqiang Hu,Boshun Gui,Nan Chen,Li Li,Feng Wu,Renjie Chen
LiI in Li-O 2 batteries has shown promise in reducing charge overpotential. However, the shuttle effect of oxidated iodine species (OISs) can lead to lithium metal corrosion and loss of OISs. During the discharging process, these iodine species can undergo side reactions, resulting in the accumulation of LiOH and other parasitic products, which in turn accelerates battery failure. In this work, we have drawn inspiration from mussel protein and utilized a simple co-deposition method to form a robust biomimetic functionalized coating on the surface of the glass fiber separator. This was achieved by grafting catechol/polyamine (CA/PA) with 11-mercaptoundecanoic acid (MUA). This separator exhibits strong electrostatic repulsion towards negatively charged OISs and, conversely, electrostatic attraction towards Li + , this dual action effectively suppresses the shuttle effect and facilitates Li + transport. When equipped with this modified separator, the Li-O 2 battery effectively reduces the accumulation of LiOH and demonstrates significantly enhanced rate performance and cycle stability. Our findings provide a versatile approach for the design of modified separators for Li-O 2 batteries with redox mediators (RMs).
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Dan Li,Fu Sun,Yuqing Zhang,Yulong Liu,Hao Sun,Haiming Xie,Jia Liu,Seung-Taek Myung,Jiefang Zhu
In situ characterization on interface stability has been hardly tried in redox mediator (RM)-involved Li-O 2 battery thus far. Here, benzyltriethylammonium iodide (BTEAI) can act as a self-defensive RM in the electrolyte LiTFSI/TEGDME to enhance the reaction kinetics and increase the cycling stability by suppressing the redox shuttling. I - effectively reduces the charging overpotential by changing decomposition route for Li 2 O 2. BTEA + can facilitate LiTFSI decomposition in the electrolyte, and participate in formation of an organic–inorganic composite SEI-contained layer on Li anode. Moreover, for the first time, non-destructive synchrotron X-Ray tomography is used to investigate the mechanism of suppressing shuttle effect by monitoring the morphological evolution of electrodes interface. This work provides an insight into the development of functional RM and in situ protection strategies for Li anodes in Li-O 2 batteries.
研究领域:
材料科学
·
电化学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2024
·
IF 5.3
Jie Lian,Wenyu Gong,Jianing Guo,Mingxing Wu
Construction of mesoporous structure and improving the conductivity of carbon counter electrode are feasible paths to enhance the catalytic activity in dye-sensitized solar cells (DSCs) toward the I 3 - /I - redox couple regenerating (IRR). Herein, mesoporous carbon fiber (PCf) has been first synthesized and the DSCs using PCf counter electrode results in a power conversion efficiency (PCE) of 7.12%, significantly surpassing the PCE of 6.01% generated by the DSCs with carbon fiber (Cf) counter electrode without mesoporous structure. Additionally, doping with heteroatoms B or N can further enhance the catalytic performance of PCf. Consequently, B or N doped Cf (BPCf or NPCf) counter electrode-based DSCs achieve high PCE values of 8.43% and 7.96%, respectively, demonstrating PCE improvements of 40.3% and 32.4%. This enhancement in catalytic activity for IRR in DSCs can be first attributed to the increased specific surface area of Cf which can provide more catalytic activated sites. Meanwhile, the enhanced conductivity of PCf by heteroatoms B or N doping is also an important factor for the improved catalytic activity. This work is expected to provide potential path to enhanced the catalytic activity of carbon counter electrode in DSCs toward IRR.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Liguo Wei,Xiaohu Xu,Lishuang Zhao,Junyun Liu,Run Wang,Xindan Zhang
To improve the photovoltaic performance of the traditional TiO 2 photoanode for dye-sensitized solar cells (DSSCs), a series of layered TiO 2 /rGO composited DSSCs photoanode was assembled by changing the morphologies of the TiO 2 and introducing reduced graphene oxide (rGO) into different areas of the photoanode films. Firstly, TiO 2 nanoflowers (TiO 2 -NFs), TiO 2 nanorods (TiO 2 -NRs) were prepared employing the hydrothermal method and used as photoanode materials to explore the synergistic effect of TiO 2 with different morphologies in layered photoanode. Then, TiO 2 -NFs/rGO composited photoanode (TNF/rGO) were fabricated to research the mechanism of rGO on improving electron transmission in the layered photoanode. The effect of adding rGO at different parts of the layered photoanode on the performance of DSSCs was also investigated. Attributing to the enhancement of light absorption and charge transfer, a champion power conversion efficiency ( η ) of 9.21 % ( J sc = 23.36 mA cm −2 , V oc = 0.74 V, FF = 0.53) was achieved with the layered TiO 2 /rGO composited photoanode containing two consecutive layers of TiO 2 -NFs/rGO and P25/rGO, which exhibited an 82.01 % increase than traditional TiO 2 (pure P25) photoanode ( η = 5.06 %, J sc = 12.09 mA cm −2 , V oc = 0.73 V, FF = 0.58). It is an effective way to design and fabrication of layered TiO 2 /rGO composited photoanode to regulate the photovoltaic performance of traditional TiO 2 photoanode for DSSCs based on the synergistic effect of its multi-layer structure, TiO 2 morphologies and introduction of rGO.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Sustainability
·
2024
·
IF 7.1
Yunlong Zhang,Mengbai Ma,Yingjie Zhang,Tianrun Yuan,Shiqiang Wang,Bin Tao,Xiaolei Bi
The introduction of redox additives, for example lithium iodide into the catholyte of lithium-ion capacitors can achieve capacity matching between the cathode and anode through the additional capacity provided by the redox reaction. However, the relatively slow redox reaction rate exacerbates the issue of kinetic imbalance between the cathode and anode during charging and discharging process, resulting in reduced coulombic efficiency and power density of lithium-ion capacitors. Herein, we doped carbon nanosheets with NH 3 followed by high temperature treatment to obtain carbon nanosheets with rich defects. Theoretical calculations show that defect sites have a mild adsorption effect on iodide. Moreover, the electrochemical evaluation reveals that the defect structure can promote the redox reaction kinetics, thus increasing the electrochemical performance, especially power density of lithium-ion capacitors in the redox electrolyte system.
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）