Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-8
·
IF 2.833
Jiao Yu,Chen Wei,Lei Tianyu,Dai Liping,Chen Bo,Wu Chunyang,Xiong Jie
High energy density, low cost and environmental friendliness are the advantages of lithium-sulfur (Li-S) battery which is regarded as a promising device for electrochemical energy storage systems. As one of the important ingredients in Li-S battery, the binder greatly affects the battery performance. However, the conventional binder has some drawbacks such as poor capability of absorbing hydrophilic lithium polysulfides, resulting in severe capacity decay. In this work, we reported a multi-functional polar binder (AHP) by polymerization of hexamethylene diisocyanate (HDI) with ethylenediamine (EDA) bearing a large amount of amino groups, which were successfully used in electrode preparation with commercial sulfur powder cathodes. The abundant amide groups of the binder endow the cathode with multidimensional chemical bonding interaction with sulfur species within the cathode to inhibit the shuttling effect of polysulfides, while the suitable ductility to buffer volume change. Utilizing these advantageous features, composite C/S cathodes based the binder displayed excellent capacity retention at 0.5 C, 1 C, 1.5 C, and 3 C over 200 cycles. Accompany with commercial binder, AHP may act as an alternative feedstock to open a promising approach for sulfur cathodes in rechargeable lithium battery to achieve commercial application.
研究领域:
材料科学
·
电化学能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Bin Li,Youxiang Shao,Jiangji He,Ruicheng Chen,Sixie Huang,Zhiliang Wu,Jianhui Li,Zaisheng Wang,Guocong Liu
In order to overcome severe capacity fading of LiCoO 2 /graphite lithium-ion battery at a high voltage, lithium difluoro(oxalate)borate (LiDFOB) was investigated as an electrolyte additive . Electrochemical tests demonstrate that by adding 1 wt.% LiDFOB into a carbonate electrolyte, the capacity retention of the battery after 300 cycles at 1 C between 3.0 and 4.5 V is improved from 42.1 to 80.2%. With the help of computational calculations and physical characterization techniques, we found that the LiDFOB strongly coordinates with Co ions , which inhibits the dissolution of cobalt from bulk LiCoO 2 and prevents Co deposition on the anode. Meanwhile, the LiDFOB additive form stable, uniform, and thin surface films simultaneously on positive and negative of the LiCoO 2 /graphite battery, inhibiting the electrolyte decomposition and leading to the improvement of the batteries performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Tao Huang,Xiangzhen Zheng,Chunfeng Yan,Ying Pan,Maoxiang Wu
1,3-Divinyltetramethyldisiloxane (DTMS) is a multifunctional additive that is used to improves the cycling stability and capacity retention of Li-rich Mn-based layered oxide cathodes (LRMs). Cycling performance evaluations demonstrate that LRM/Li cells without the additive exhibit lower capacity retention. DTMS can significantly improve the capacity retention of LRM/Li cells from 42.8% to 75% at 0.5C. Theoretical calculations indicate that DTMS is preferentially oxidized on the LRM surface. Physical characterization results reveal that DTMS generates a layer on the LRM surface that is both less resistive and thinner than the LRM by reacting with HF/F − from the electrolyte. This DTMS-derived layer inhibits adverse reactions between the cathode and electrolyte, thus, effectively maintaining the cathode structure.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Batteries & Supercaps
·
2023
·Vol. 6
·期 8
·e202300124
·
IF 5.7
Fei Ma,Yingbo Li,Bin Liu,Jingkun Wu,Yuhu Wu,Jun Lu,Cheng Zhong,Wenbin Hu
Graphical Mass-produced micro-sized SiO x @C composites with different morphologies for commercial LIBs are reported. Particularly, SiO x wrapped by three-dimensional carbon layers exhibits outstanding properties as compared to commercial graphite. It originates from the critical contribution of three-dimensional carbon layers, which serves as the effective stress buffer and protective layer as well as the strong networks for electron/Li + transport. Silicon oxide (SiO x ) is a promising anode candidate of lithium-ion batteries (LIBs) owing to its extremely high specific capacity. However, the low initial Coulombic efficiency (ICE) and rapid capacity degradation of SiO x , triggered by the enormous volume variation upon repeated (de)lithiation, gravely hinder its practical use. Herein, two mass-produced micro-sized SiO x @C composites with obviously different morphologies for commercial LIBs are reported. Particularly, the SiO x -graphite blended anode (SiO x @3D-G-Gr) based on SiO x wrapped by three-dimensional (3D) carbon layers (SiO x @3D-G) exhibits a capacity of 519 mAh g −1 , an ICE of 90.0 % and a capacity retention of 83.4 % at 0.2 C over 100 cycles. which is far exceeding its counterpart SiO x @C-H-Gr (65.7 %). The obtained impressive properties of SiO x @3D-G originate from the critical contribution of 3D carbon layers, which serves as the effective stress buffer and protective layer as well as the strong networks for electron/Li + transport. Accordingly, the full-cell based on SiO x @3D-G-Gr anode and commercial LiCoO 2 cathode delivers a capacity of 803 mAh and an excellent capacity retention of 95.6 % (616 mAh, 96.6 % for graphite, respectively) at 1 C over 100 cycles with a stabilized CE of nearly 100 %. The micro-sized SiO x @3D-G showing a promising prospect in the commercial-grade anodes in LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Niu Lijing,Zhao Jiajia,Xie Mengmeng,Jiang Xunyong
Dry electrode manufacturing methods that do not use NMP can reduce the time and energy required to produce lithium-ion batteries. Polyvinylidene fluoride (PVDF) is a commonly used binder in the dry process. However, there is a lack of research on the effect of dry process parameters on PVDF crystalline types. In our work, the dry process parameters of graphite anode with PVDF as binder are studied, such as the effects of temperature, pressure, and time on the crystallization of PVDF. The effects of powder mixing process and binder content on the performance of dry graphite electrodes are investigated. PVDF processed at 180 °C, 6 MPa, and for 15 min under hot pressing conditions favors the presence of β-crystalline forms. The capacity retention of the prepared electrodes with 10% PVDF loading is superior to that of conventional wet electrodes. Subsequently, reducing PVDF to 5% induces additional cycling stability and rate handling improvements of the dry electrode. Graphical abstract
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 Energy Chemistry
·
2023
·
IF 13.1
Renlong Li,Binghan Cui,Qingjie Zhou,Xue Mu,Yunzhi Gao,Geping Yin,Chuankai Fu,Pengjian Zuo
Macro- and micro-interface instability of SiO x anode caused by its dramatic volume variation during cycling will result in low Coulombic efficiency and rapid capacity degradation. In this work, an organic-inorganic composite interfacial layer rich in benzene ring groups, polyisocyanates, and LiF was obtained on SiO x anode by the introduction of 4-fluorophenyl isocyanate (FPI) and fluoroethylene carbonate (FEC) co-additives in electrolyte. The SiO x anode material shows a capacity retention of 69.2% after 100 cycles at a current density of 1 A g −1 and rate capacity of 523 mA h g −1 at the current density of 3 A g −1 , while the SiO x anode cycling in reference electrolyte has almost no capacity.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Bo Xiao,Dongjia Li,Xinyi Dai,Yawei Wei,Yunchao Liao,Chao Wang,Fangli Ji,Fuzhong Wu
The low cycling stability of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) is due to structural instability during lithium insertion and removal and strong surface reactivity, and it limits widespread application. In this study, a layer of LiCoPO 4 was coated on NCM811, and electrochemical tests showed that the material had excellent high-voltage electrochemical properties. The NCM811 sample coated with 1.0 wt% LiCoPO 4 (NCM-LCP1) had a capacity of 156.5 mAh g −1 after 100 cycles at 3–4.6 V and a retention rate of 87.47%. In contrast, the capacity of unmodified NCM811 was only 96.9 mAh g −1 , with a retention rate of 55.9%. An NCM-LCP1/graphite full cell demonstrated a capacity retention rate of 87.46% over 200 cycles at 3–4.3 V. By combining EIS and postcycle analyses, the stability and protection mechanism of the LiCoPO 4 layer under high voltage was confirmed. The LiCoPO 4 layer effectively prevented particle fragmentation and kept the structure stable. It also suppressed side reactions on the cathode surface. This work offers a new methodology for modifying NCM811 materials operated at 4.6 V.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Bing Li,Jing Wang,Zulai Cao,Peng Zhang,Jinbao Zhao
The manganese metal ions and other transition metal ions in lithium manganite cathode materials will be dissolved into the electrolyte during cycling and storage at charged state, leading to severe capacity fading. Herein, the SnO 2 -coated Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 cathode material is prepared successfully by a simple organic liquid-phase method. The data of inductive coupled plasma-atomic emission spectroscopy and ex-XRD suggest that the coating layer can effectively suppress the dissolution of metal ions , which maintains the stability of main structure. The value of the charge transfer impedance is 35.49 Ω cm 2 for LLMO-Sn1 after 50 cycles, while the LLMO is 123.30 Ω cm 2 . The LLMO-Sn1 has the highest discharge capacity of 214.0 mAh·g −1 after 150 cycles in half cell and exhibits the capacity retention of 86.8% after 150 cycles in full-cell. The decomposition reaction peak of LLMO-Sn1 appears at 250.1 °C.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wenwei Zhang,Chen Tang,Binxu Lan,Lineng Chen,Wen Tang,Chunli Zuo,Shijie Dong,Qinyou An,Ping Luo
Aqueous zinc ion battery is a new type of rechargeable battery developed in recent years, which have received extra attention due to the lower cost, higher safety, and more environmentally friendly. However, developing the suitable cathode materials for the insertion/extraction of Zn 2+ is still major challenge for aqueous zinc ion batteries as the strong electrostatic interaction between multivalent metal ions and host cathodes. In this work, a potassium vanadium oxide (K 0.23 V 2 O 5 ) with tunnel structure has been prepared by hydrothermal synthesis and is firstly employed as cathode material for aqueous zinc ion batteries, which delivers an excellent structural stability and high capacity retention rate of 92.8% (103 mA h g −1 ) after 500 cycles at current density of 2.0 A g −1 . In addition, the ion diffusion rate is as high as 1.88 × 10 −9 −2.6 × 10 −8 cm 2 S −1 , which is much higher than most other cathode materials for aqueous zinc ion batteries. The outstanding performances demonstrate that K 0.23 V 2 O 5 is a promising cathode for aqueous zinc ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2025
·
IF 17.1
Dong Wang,Hongmei Cao,Jiao Wang,Junhao Liu,Xuzhong Gong,Tao Qi,Zhi Wang
The preparation of LiNi x Co y Mn z O 2 (NCM) cathode through molten salt (MSs) reaction has great advantage in electrochemical performance due to its uniform and well-controlled reaction environment. However, the critical role of O 2- which acts as the essential reactant has never been considered. Here, homogeneous NCM523 cathode particles with low Li/Ni intermixing were synthesized in LiCl-containing molten salts, benefiting from the excellent O 2- dissolving capability of LiCl. The critical role of LiCl shows that it can either promote the uniform crystallization or leads to the collapse of the layered structure. Furthermore, by considering both O 2- solubility and low melting point, the prepared NCM523 cathode shows high specific capacity (173 mAh g −1 at 0.1 C, 4.3–2.8 V) and excellent capacity retention (96 % after 150 cycles at 1 C cycling). The NCM cathode preparing process in molten LiCl containing MSs shows both advance in thermodynamics and kinetics. This approach can also be successfully extended to other NCM cathode materials.
研究领域:
材料科学
·
电化学
·
储能
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2013
·
IF 4.675
Wen Hu,Xinchuan Du,Yaoming Wu,Limin Wang
Novel ε-Cu 0.95 V 2 O 5 hollow microspheres assembled by single-crystalline nanoribbons can be easily synthesized directly from a hydrothermal reaction between V(IV)O(acac) 2 and Cu(NO 3 ) 2 in a solution containing a proper amount of polymer polyvinyl pyrrolidone (PVP, K30). A possible growth mechanism has been proposed. Electrochemical measurements demonstrate that the as-prepared ε-Cu 0.95 V 2 O 5 superstructures display a reversible capacity of 304 mAh g −1 , and could sustain respectable rate capability. By reinvestigating the cooperative displacement/intercalation (CDI) mechanism of ε-Cu 0.95 V 2 O 5 using cyclic voltammetry (CV), ex situ XRD , and ex situ SEM–EDS techniques, it is found that the copper dissolution problem, which leads to poor capacity retention of cells operating on Li-driven Cu extrusion–insertion process, has not been well tackled due to its superstructure collapse. Rational electrode configuration design is urgently needed. In addition, single-crystalline α-CuV 2 O 6 nanograins are obtained by calcining the micro-nanostructured ε-Cu 0.95 V 2 O 5 precursor. The post-treated α-CuV 2 O 6 exhibits high discharge capacity of 507 mAh g −1 at 20 mA g −1 and 390 mAh g −1 at 80 mA g −1 , indicating it is a promising cathode candidate for long-term and high-rate lithium primary 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
Chemical Science
·
2024
·
IF 7.6
Zhongming Wang,Zhiyuan He,Zhongsheng Wang,Jixu Yang,Kecheng Long,Zhibin Wu,Gang Zhou,Lin Mei,Libao Chen
Lithium-ion batteries (LIBs) are extensively employed in various fields. Nonetheless, LIBs utilizing ethylene carbonate (EC)-based electrolytes incur capacity degradation in a wide-temperature range, which is attributable to the slow Li+ transfer kinetics at low temperatures and solvent decomposition during high-rate cycling at high temperatures. Here, we designed a novel electrolyte by substituting nitrile solvents for EC, characterized by low de-solvation energy and high ionic conductivity. The correlation between the carbon chain length of nitrile solvents with reduction stability and the Li+-solvated coordination was investigated. The results revealed that the valeronitrile (VN) solvent displayed an enhanced lowest unoccupied molecular orbital energy level and low de-solvation energy, which helped construct robust SEI interfacial layers and improved kinetics of interfacial ion transfer in wide-temperature LIBs. The VN-based electrolyte employed in graphite‖NCM523 pouch cells achieved a discharge capacity of 89.84% at a 20C rate at room temperature. Meanwhile, the cell exhibited 3C rate cycling stability even at a high temperature of 55 °C. Notably, the VN-based electrolyte exhibited a high ionic conductivity of 1.585 mS cm−1 at −50 °C. The discharge capacity of pouch cells retained 75.52% and 65.12% of their room temperature capacity at −40 °C and −50 °C, respectively. Wide-temperature-range batteries with VN-based electrolytes have the potential to be applied in various extreme environments.
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）