JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ying Ji,Nian Wang,Yujiao Guo,Junming Guo,Mingwu Xiang,Xiaofang Liu,Wei Bai,Hongli Bai
Spinel LiMn 2 O 4 has been identified as a cathode material with extensive application potential for Li-ion batteries. However, during cycling, the Jahn−Teller effect and Mn dissolution have a substantial impact on its specific capacity and cycle span. Herein, combining Fe and Cr elements co-doping with single crystal truncated octahedron morphology is proposed to solve these problems. The Fe−Cr co-doping markedly restrains the Jahn−Teller effect, and promotes the development of crystal and selective growth of crystal surfaces in spinel LiMn 2 O 4 . The high exposure (111) surfaces of the truncated octahedron reduce the dissolution of Mn, and a tiny proportion of (110) and (100) surfaces increase the diffusion channels of Li + . HAADF-STEM characterization indicates that the Fe and Cr elements largely replace the Mn atoms at the octahedral 16d site. Because of these advantages, the optimal LiFe 0.05 Cr 0.08 Mn 1.95- x O 4 (LFCMO-8) delivers excellent electrochemical performance with 119.6 mAh·g −1 discharge capacity and 78.1% capacity retention after 500 cycles at 1 C. At comparatively higher current densities of 20 C and 30 C, the superior capacity retention ratios of 79.8% and 87.3% are still achieved after 2000 cycles. Even at 40 C, the LFCMO-8 sample can still reach 98.8% capacity retention rate after 2000 cycles. After 1000 cycles at 5 C, the LFCMO-8 sample still maintained a capacity retention of 45.4% at high temperature (55 °C). ICP-OES test combined with a V-shaped tube device indicates that the Mn dissolution of LCFMO-8 only accounted for 11.8% of LiFe 0.05 Mn 1.95 O 4 (LFMO). This study serves as a meaningful reference for the preparation of high-performance LiMn 2 O 4 cathode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 21
·7778-7786
·
IF 6.482
Wei Wei,Yongya Zhang,Lei Liang,Kefeng Wang,Qingfeng Zhou,Yanli Zhou,Hua Wang
Metal germanium (Ge) with a high theoretical capacity of 590 mA h g−1 is regarded as a promising anode material for sodium ion batteries, but it suffers from a fast capacity decay problem due to the serious agglomeration of Ge particles caused by the drastic volume change during the sodiation/desodiation process. Constructing highly dispersed ultrafine Ge nanoparticles is a possible way to address this problem. However, reported methods to obtain highly dispersed metal nanoparticles encountered problems of poor electrochemical activity or non-uniform particle size. In this work, we proposed a new in situ confined polymerization method for preparing highly dispersed Ge quantum dots (QDs). Due to the high dispersion of Ge QDs in carbon frameworks derived from poly(ionic liquid) networks, the obtained Ge@C nanocomposite could effectively avoid the agglomeration of Ge particles. When applied as the anode material for sodium ion batteries, the Ge@C nanocomposite shows ultra-long cycle life and high rate capability. At a current density of 1500 mA g−1, the Ge@C electrode could display a high capacity of 201 mA h g−1 after 5000 cycles. This method could be extended to prepare other highly dispersed metal nanoparticles and achieve fairly efficient electrode materials for new-type secondary batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
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2012
·Vol. 1
·期 7
·2508-2514
·
IF 0
Jing Su,Xing-Long Wu,Jong-Sook Lee,Jaekook Kim,Yu-Guo Guo
A facile sol–gel approach combined with a carbon-coating technique via high-temperature thermally decomposing C2H2 has been developed for the synthesis of a Li3V2(PO4)3/C (LVP/C) cathode material employing the biomass of phytic acid as an eco-friendly phosphorus source. The effects of the carbon-coating on the structural, morphological and electrochemical properties of LVP have been investigated. Compared with pristine LVP, the LVP/C composite presents a higher discharge capacity of 127 mA h g−1 at 0.1 C, better rate capability and long-term cyclability in the voltage range of 3.0–4.3 V. Even at a high charge–discharge rate of 5 C, it can still deliver a reversible capacity of 107 mA h g−1 over 400 cycles without obvious fading, demonstrating great potential as a superior cathode material for lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Shuang Yang,Jiangmin Jiang,Wenjie He,Langyuan Wu,Yinghong Xu,Bing Ding,Hui Dou,Xiaogang Zhang
With the associated advantages of low costs and abundant resources, sodium-ion capacitors (SICs) present a suitable means for large-scale energy storage. However, their practical application is still significantly limited by the sluggish electrochemical reaction kinetics of battery-type anodes. Herein, the nitrogen-doped carbon-encapsulated Fe 7 Se 8 nanorods (Fe 7 Se 8 @NC) with a core–shell structure were prepared via an in-situ self-polymerization and carbonization–selenization approach, which improves ion transport and maintains the structural stability of the nanorods. The designed Fe 7 Se 8 @NC nanorods exhibit desirable rate capability with a capacity of 290.7 mAh/g at 10 A/g and long-term cyclability with 84.6 % retention over 6000 cycles at 5 A/g. Moreover, research has shown that the diffusion dynamics of Na + is improved in ether-based electrolytes and that the irreversible reactions at low voltages can be inhibited by a high discharge cut-off voltage. Furthermore, we demonstrated the specific sodium storage mechanism and excellent electrochemical reversibility of the Fe 7 Se 8 @NC electrode through in-situ and ex-situ characterization techniques. As expected, the assembled SICs with the Fe 7 Se 8 @NC anode and active carbon cathode deliver prominent energy/power densities and an ultra-long cycle life over 5000 cycles, shedding new light on the design of transition metal dichalcogenides as anode materials for advanced energy storage systems.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2018
·Vol. 8
·期 36
·1802176
·
IF 21.875
Xiaoyu Jiang,Xingwei Liu,Ziqi Zeng,Lifen Xiao,Xinping Ai,Hanxi Yang,Yuliang Cao
Dual-carbon batteries provide a new perspective on energy storage technology due to their high voltage and low cost. Herein, a novel Na + -based dual-carbon battery (Na + -DCB) is developed based on a nonflammable trimethyl phosphate (TMP) electrolyte with sodium bis(trifluoromethanesulfonate)imide salt (NaTFSI). As the molar ratio of NaTFSI/TMP increases to 1:2, the graphite cathode shows a high reversible capacity of 52.9 mAh g −1 , excellent rate capability (21.0 mAh g −1 at 2000 mA g −1 ) and superstability cycling performance (≈100% capacity retention after 750 cycles). In addition, a stable solid electrolyte interface (SEI) film is formed on the surface of hard carbon anode by the preferential reductive decomposition of TFSI − , which suppresses decomposition of TMP. In this case, the Na + -DCB is capable to provide an operation voltage of 4.0 V and excellent electrochemical performance. This work provides new insights for developing new dual-carbon batteries with safety, low cost, and absence of heavy metals.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yongfeng Bu,Hongyu Zhang,Jinzhi Hu,Wenya Jiang,Qin Kang,Shihao Wang,Yuman Li,Shengda Tang,Hongyu Liang
Metallic selenides are considered as a promising class of alternative anodes for sodium ion batteries due to the high capacity conferred by their hybrid sodium storage mechanism. However, the low reversible volume expansion induced by larger size sodium ion storage greatly limits their cycle life, theoretical capacity mining and electrode thickness enhancement. Herein, a germanium selenide/carbon nanofibers (GeSe/CNFs) sodium storage anode is first reported by taking advantage of the encapsulation and dispersion of electrostatic spinning technology, i.e., GeO 2 is first mixed with polyacrylonitrile and electrospun to form a wrapped structure, followed by in situ pre-oxidation, carbonization, and selenization. For the optimized electrode, it delivers a high capacity up to 567 mAh g −1 based on the mass of GeSe (320 mAh g −1 based on GeSe/CNFs), reaching > 80% of its theoretical capacity, with a > 2300 cycles cycling stability at 1.0 A g −1 . In addition, its capacity barely decays after 700 cycles at near commercial electrode thickness (115 µm, the capacity retention > 47–63% even at the ultrahigh thickness of 187–219 µm). This study opens up new possibilities for the development of Se-based sodium storage anode materials with long life, high capacity and ultra-thick electrode that are expected to meet practical needs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Shuai Zhang,Zhenqian Li,Meng Wang,Dongyi Jia,Haiyi Jin,Han Zhang,Haipeng Zhang,Yixuan Ma
The development of high-performance and cost-effective battery technologies is crucial for storing and utilizing intermittent renewable energy. Aqueous iron-ion batteries (AIBs) constructed using low-cost iron salts hold promise in energy storage strategies but are constrained by the complex design and construction of cathode materials. Here, we report a one-step synthesis of carbon nanodots as conductive substrates for cathode-free aqueous iron-ion batteries, enabling the efficient deposition of hydroxyl iron oxide and enhanced ion storage. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman analyses confirm the effective deposition of hydroxyl iron oxide, ensuring the achievement of a maximum capacity of 0.43 mAh cm −2 . The designed cathode-free aqueous iron-ion battery demonstrates a long cycling life of up to 2000 cycles, representing a new direction for the development of aqueous iron-ion batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Jieqi Chen,Haiyan Zhang,Bingbing Li,Xiaolin li,Jingxun Chen,Meng Ning,Zhenghui Li
Carbon is one of the most superior anode materials for K-ion batteries but faces the challenges of low capacity and poor cycle stability. In general, the K + storage capacity depends on the graphitized carbon layers and defective structure, while the cycle stability can be enhanced by constructing sufficient nanospace to alleviate the volume expansion during the potassiation/depotassiation process. However, the above structures are difficult to integrate into a single carbon material because graphitization often eliminates defects and pore structures. In this work, we find that ultrathin carbon sheets have a confined graphitization effect, which allows the carbon layer to orientationally arrange at a low heating-treatment temperature. More importantly, this orientational arrangement causes size shrinkage, inducing structural splitting on the faces of the carbon sheets and producing abundant defects and a large number of pores. Based on this, we obtain a novel carbon with highly graphitized, large-surface-area and defect-rich frameworks, which gives a K + storage capacity of 358 mAh g −1 , and after 4000 cycles, this carbon shows no obvious capacity degradation, with a capacity retention rate of nearly 100 %. Carbon anodes of K-ion batteries with such large capacity and long cycling life have rarely been achieved before.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xiaolei Wu,Hanqing Zhao,Junmin Xu,Zhuangfei Zhang,Weixia Sheng,Shuge Dai,Tingting Xu,Sen Zhang,Xinchang Wang,Ye Wang,Xinjian Li
Searching for low-cost, high capacity, stable and well-designed cathode materials with good rate capability and long-life cycling performances is our long-term goal for rechargeable lithium/sodium batteries . In this work, a simple and scalable strategy is developed to synthesize metal-organic frameworks (MOFs) derived Fe 7 S 8 /C composites by sulfurizing Fe-MIL-88A MOFs. The synthesized Fe 7 S 8 /C composites are of rod-like morphology with the well-dispersed Fe 7 S 8 nanoparticles in porous carbon matrix. Such a structure could offer distinct advantages for Fe 7 S 8 -based electrode materials for both lithium and sodium batteries . When evaluated as a cathode material for rechargeable Fe 7 S 8 /Li batteries , the Fe 7 S 8 /C composites exhibit a long and flat discharge plateau around 1.5 V and delivers a high specific discharge capacity of 473 mA h g −1 at 0.1 A g −1 after 100 cycles with excellent rate capability and long-life cycling performance at high current density (~301 mA h g −1 after 1000 cycles at 1.0 A g −1 ). Moreover, the Fe 7 S 8 /C composites could also exhibit high specific capacities, good rate performance and high cycling stability as an anode material for sodium ion batteries. Our findings demonstrate that Fe 7 S 8 /C composites with rod-like morphology are promising electrode materials for lithium/sodium batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Energy Technology
·
2019
·Vol. 7
·期 9
·1900454
·
IF 3.163
Xue Li,Yujie Zhang,Jingwei Shen,Shun-an Cao,Ting Li,Fei Xu
Rechargeable Mg batteries are attractive candidates for large-scale energy storage batteries with high safety due to the low-cost and non-dendritic metallic Mg anode. However, exploring high-performance cathode materials is blocking their development. Herein, a high-rate rechargeable Mg battery is established with a AgCl cathode, delivering a high reversible capacity of 70.3 mAh g −1 at 100 mA g −1 , an outstanding rate capability of 32.6 mAh g −1 at 1000 mA g −1 , and a superior long-term cyclability over 500 cycles. Further investigation of the mechanism demonstrates that a conversion reaction takes place between AgCl and metallic Ag 0 for the cathode. The solid-state Mg 2+ diffusion coefficient is as high as 8.1 × 10 −11 cm 2 s −1 , which would be the reason for the high rate capability. The current study reveals significant insights to select promising Mg-storage conversion cathodes by a combination of soft anions and soft transition-metal cations.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Hong Chen,Yuchen Wu,Hanyu Xu,Jiaqing Zhao,Ji Wang,Chaojie Ren,Chao Zhao,Ruizhi Yang
The limited electron and ionic conductivity, along with the sluggish kinetics caused by the Jahn-Teller effect of Mn 3+ , impose constraints on the electrochemical performance of LiFe x Mn 1-x PO 4 . Herein, the surface of LiFe 0.5 Mn 0.5 PO 4 (LFMP) is modified with a F-doped carbon using the solvothermal and calcination methods. The incorporation of F-doped carbon coating, along with the formation of interfacial F-Li, F-Fe and F-Mn bonds between the carbon layer and LFMP nanoparticles, significantly mitigates charge transfer resistance, facilitates rapid electron transfer, as well as enhances Li + diffusion kinetics. The LFMP@C-F2 cathode prepared in this study exhibits an unexceptionable capacity retention of 90.5 % after 300 cycles at a low rate of 0.2C and a capacity retention of 78.8 % over 1000 cycles at a high rate of 1C. When incorporated into the solid battery configuration (Li/PEO-LATP CSE/LFMP@C-F2), it exhibits an initial discharge specific capacity of 148 mAh g −1 and maintains a capacity retention of 85.8 % after 60 cycles at 0.1C, thereby offering an innovative approach to enhance the performance of LFMP in terms of cycling stability and rate capacity in lithium-ion batteries, as well as to apply LFMP into solid-state lithium batteries.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Fan Wu,He Ma,Xin Ye,Shaoyang Wu,Haodong Zhang,Kang Liang,Jianbin Li,Yurong Ren,Peng Wei
Mixed iron-based phosphate Na 4 Fe 3 (PO 4 ) 2 P 2 O 7 /C (NFPP) has gradually emerged as a promising cathode material for sodium-ion batteries (SIBs) owing to its affordability and convenient preparation. However, poor electrical conductivity and inadequate sodium-ion diffusion limit the exertion of its electrochemical properties. Herein, a structural modulation strategy based on Cd doping is applied to NFPP to address the above limitations. In situ X-ray diffraction analysis reveals that Cd-doped NFPP (NFCPP) undergoes an incomplete solid-solution reaction driven by Fe 2+ /Fe 3+ redox. Cd doping effectively stabilises the crystal structure, resulting in a minimal 1 % change in unit cell volume during cycling. Density of state calculations indicate that Cd doping reduces the band gap, increases the local electron density and significantly improves electron conductivity. Benefitting from the enhanced electrochemical kinetics and intercalation pseudocapacitance, the optimised Na 4 Fe 2.91 Cd 0.09 (PO 4 ) 2 P 2 O 7 /C (NFCPP@3%) exhibits exceptional rate performance (capacity of 62 mAh/g at 20 C) and ultra-long cycling life (82.7 % after 6000 cycles at 20 C). A full SIB prepared using NFCPP@3% and hard carbon, display a 91 % capacity retention rate at a current density of 130 mA g −1 over 200 cycles. This work demonstrates that doping can effectively enhance electrochemical performance and offers insights into future development of SIBs.
研究领域:
材料科学
·
电化学
✓ 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）