Microstructures
·
2022
·Vol. 2
·期 3
·N
·
IF 0
Xueting Wang,Yunchuang Wang,Meichao Wu,Ruopian Fang,Xi Yang,Da-Wei Wang
This study introduces porous ZnO@C nanoplates to improve lithium-ion battery performance, and the addition of reduced graphene oxide (rGO) further enhances capacity at high current density.
研究领域:
材料科学
·
纳米技术
·
电化学
·
能源存储
·
功能材料
✓ 已验证
DOI
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Kaiyu Qi,Zeming Yuan,Yuan Hou,Ruichao Zhao,Bangwen Zhang
MoS 2 nanosheets have been widely explored as LIB anode materials due to higher theoretical capacity and weak interlayer interactions, but limited by their low conductivity and ease of stacking. Herein, we reported a novel Fe doped MoS 2 /reduced graphene oxide (Fe-MoS 2 /rGO) composite as LIB anode material and its one-step synthesis method. The results show that the synthesized Fe-MoS 2 /rGO composite has unique porous heterostructure , where networked Fe-MoS 2 nanosheets of several nm thickness grow upon crumpled rGO sheets with high specific area. Due to the Fe doping as well as the mild synthesis conditions, the resulting Fe-MoS 2 upon rGO sheets has wide interlayer spacing, abundant lattice defects and lower inner resistance. As a result, the Fe-MoS 2 /rGO electrode exhibits significant improvement in electrochemical performance relative to the non-doped MoS 2 /rGO electrode. The reversible capacities of Fe-MoS 2 /rGO electrode reach 1255 mAh/g (2nd circle) and 946 mAh g −1 (100th circle) with a retention of 75.4%. By comparison, the reversible capacities of MoS 2 /rGO electrode are only 654.1 mAh g −1 (2nd circle) and 429 mAh g −1 (100th circle) with a low retention of 64.1%.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
固态化学
✓ 已验证
DOI
高影响因子
Energy Technology
·
2020
·Vol. 8
·期 5
·2000010
·
IF 3.404
Zhenglu Shi,Qiang Ru,Shikun Cheng,Xianhua Hou,Fuming Chen,Francis Chi-Chung Ling
Transition metal oxides have wide potential applications in high-performance energy-storage devices. Herein, hierarchically rambutan-like Zn 3 V 3 O 8 (ZVO) hollow spheres are fabricated using a simple reflux/anneal strategy. These hollow spheres are enriched with highly porous features and a favorable surface area, which can afford abundant Li + /K + transport paths, mitigate the volume dilatation, and boost the ion-storage capabilities. As the anodes for lithium-ion batteries, the ZVO electrodes can sustain a high discharge capacity of 1283.7 at 0.2 A g −1 after 50 cycles. Even as the current density reaches 5 A g −1 , the reversible discharge capacity also remains 541 mA h g −1 after 1000 long-term cycles. As the anodes for potassium-ion batteries, ZVO electrodes can afford a discharge specific capacity of 100.1 mA h g −1 at 0.1 A g −1 after 100 cycles. The results demonstrate that hierarchically rambutan-like ZVO hollow spheres can serve as a feasible candidate for Li + /K + storage.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
无机化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Wangwu Li,Jiao Peng,Hui Li,Zhenyu Wu,Yuehua Huang,Baobao Chang,Xiaowei Guo,Gairong Chen,Xianyou Wang
At present, the main limitations for the practical application of silicon (Si) as an anode material of a lithium-ion battery are huge volume variation and low electrical conductivity. Core–shell silicon/carbon (Si/C) composites can greatly relieve the Si large volume change and accelerate the low Li+ conductivity; however, cracking of carbon shell and the failure of the electrode structure still limit the lithium storage capability and cyclic life. Herein, a flexible freestanding N-doped core–shell Si/C nanofiber (SC-NF) anode is prepared by the double-nozzle electrospinning technique. It has been found that in such fibers, Si particles are encapsulated by the carbon shell of fibers, which can settle the shortcomings of pulverization and volume variation of Si. Furthermore, the highly conductive N–C shell derived from carbonized PAN can accelerate the diffusion of Li+ and charge transport. As a result, the as-prepared core–shell SC-NF-0.24 electrode exhibits an initial specific discharge capacity of 1441 mAh g–1 with a high capacity retention of 76.9% at 0.5 A g–1, and the capacity decay rate of per cycle is only 0.1% (starting on the third cycle), showing a good cycle property. Therefore, the as-prepared freestanding core–shell SC-NF material is a prospective anode material for high-performance lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
·
复合材料
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Xiaoyu Wen,Kaixiong Xiang,Yirong Zhu,Li Xiao,Haiyang Liao,Xianhong Chen,Han Chen
To confine the intermediate polysulfides to obstruct their dissolution from the electrolyte and increase the utilization of sulfur, a novel sulfur host for decorated nitrogen-doped carbon nanotube (NCNTs) microspheres was produced by a terse ultrasonic spraying with succedent impregnation methods. Decoration effects for Nb2O5 are better than those for Sb. Nb2O5–NCNTs microspheres are woolen-like uniform balls which are twined with CNTs and infiltrated Nb2O5 nanoparticles. Then Nb2O5–NCNTs microspheres deliver the high initial charge and discharge capacities of 1369.5 and 1335.3 mAh g–1, good cycle stability of 1201.7 mAh g–1 at 0.1 C after 200 cycles, and outstanding long-term cycle life of 846.2 mAh g–1 after 1000 cycles at 2.0 C with a very low capacity decay of 0.016% per cycle. The Nb2O5–NCNTs microspheres with remarkable effects for sulfur confinement are a potential cathode material for lithium–sulfur batteries.
研究领域:
电化学储能
·
材料科学
·
纳米材料
·
能源化学
·
电池技术
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2018
·Vol. 2
·期 6
·1323-1331
·
IF 0
Lihua Jiang,Qingsong Wang,Ke Li,Ping Ping,Lin Jiang,Jinhua Sun
The rational design of flame-retardant electrolytes is essential for improving the safety of lithium ion batteries. Cooling is the key to curbing thermal runaway and compatibility is the basis to ensure electrochemical performance. Here we design a composite electrolyte with a double safety protection mechanism with self-cooling and flame-retardant effects simultaneously. N,N-Dimethylacetamide (DMAC) as a Lewis base can improve the thermal stability and perfluoro-2-methyl-3-pentanone (PFMP) with a self-cooling function can act as an internal micro-fire-extinguisher. Acceptable electrochemical performance is ensured via the introduction of a fluorocarbon surfactant (FS) that can improve the interface compatibility. This composite electrolyte is a good alternative for lithium ion batteries as it presents beneficial properties both in electrochemical performance and thermal stability.
研究领域:
电化学
·
材料科学
·
能源存储
·
电池安全
·
功能材料
✓ 已验证
DOI
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Dong Cao,Mingxi Ren,Jie Xiong,Limei Pan,Yi Wang,Xinzhe Ji,Tai Qiu,Jian Yang,Chuanfang (John) Zhang
In this work, flexible free-standing Ti 3 C 2 T x -CNT/SiNPs (Si nanoparticles) resilient films with hierarchical pore are prepared by a simple and scalable self-assembly method. The Ti 3 C 2 T x nanosheets and acidified CNTs are attracted by hydrogen bonds via surface functional groups, and are further assembled with positively charged SiNPs modified by cetyltrimethyl-ammonium bromide via the electrostatic attraction. The subtle assembling and synergistic action among 0 dimensional (0D) SiNPs - 1 dimensional (1D) CNTs and 2 dimensional (2D) Ti 3 C 2 T x nanosheets offer the films with excellent mechanical flexibility, conductivity, abundant hierarchical voids and thus superior and impressive electrochemical properties as binder-free LIBs anode. The hierarchical pore structure effectively inhibits both the aggregation of SiNPs and restacking of Ti 3 C 2 T x nanosheets, provides fast electron and ion diffusion path, facilitates the penetration of electrolyte and absorbs the volume expansion of SiNPs during the charge and discharge processes. The Ti 3 C 2 T x -CNT/SiNPs film exhibits a high areal capacities up to 5.2 mAh cm −2 at the current density of 100 mA g −1 . Moreover, a good cyclic retention of 2.2 mAh cm −2 at an area mass loading of 2.3 mg cm −2 after 150 cycles is also achieved. Furthermore, a pouch cell based on the Ti 3 C 2 T x -CNT/SiNPs film anode is demonstrated, showing promising preliminary electrochemical performance and indicating the future application prospect in flexible LIBs.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
先进电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Gui-lin Zhuang,Yi-fen Gao,Xiang Zhou,Xin-yong Tao,Jian-min Luo,Yi-jing Gao,Yi-long Yan,Pei-yuan Gao,Xing Zhong,Jian-guo Wang
Herein we report a facile bottom-up strategy to prepare highly dispersed supported Co 3 O 4 on N-doped Porous Carbon (NPC). Specifically, ZIF-67 (ZIF = Zeolitic Imidazolate Frameworks) microcrystals firstly grow on benzoic acid modified covalent organic framework (BFC), resulting in ZIF-67/COF composite. Subsequently, highly dispersed Co 3 O 4 /NPC was obtained via the calcination of ZIF-67/COF. Interestingly, high dispersion of supported Co 3 O 4 is dominated by homogeneous distribution of benzoic acid auchoring on nanoporous COF . More notably, largely triggered by the porosity and confining effect of COF , the resultant Co 3 O 4 /NPC features highly active crystal plane and a large specific surface area of 228.0 m 2 /g. Furthermore, the oxygen evolution reaction (OER) measurement results demonstrated that highly dispersed Co 3 O 4 /NPC features good catalytic activity (330 mV overpotential at 10 mA.cm −2 , 79 mV.dec −1 Tafel slope and mass activity of 130 A.g −1 at overpotential of 400 mV) and durable stability, superior to currently available counterparts. Moreover, Li-ion battery (LIB) tests also showed high reversible capacity (785 mA.h.g −1 at 500 mA.g −1 ) as well as excellent cycling stability and rate performance. Furthermore, Density functional theory (DFT) calculation results demonstrated that these superior OER properties can be attributed to the geometrical and electronic effects of Co 3 O 4 /NPC on activation and adsorption/desorption of reaction species.
研究领域:
材料科学
·
电化学
·
纳米催化
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 44
·18792-18799
·
IF 7.76
Chao Yang,Shengjue Deng,Chunfu Lin,Shiwei Lin,Yongjun Chen,Jianbao Li,Hui Wu
TiNb24O62 is explored as a new anode material for lithium-ion batteries. Microsized TiNb24O62 particles (M-TiNb24O62) are fabricated through a simple solid-state reaction method and porous TiNb24O62 microspheres (P-TiNb24O62) are synthesized through a facile solvothermal method for the first time. TiNb24O62 exhibits a Wadsley–Roth shear structure with a structural unit composed of a 3 × 4 octahedron-block and a 0.5 tetrahedron at the block-corner. P-TiNb24O62 with an average sphere size of ∼2 μm is constructed by nanoparticles with an average size of ∼100 nm, forming inter-particle pores with a size of ∼8 nm and inter-sphere pores with a size of ∼55 nm. Such desirable porous microspheres are an ideal architecture for enhancing the electrochemical performances by shortening the transport distance of electrons/Li+-ions and increasing the reaction area. Consequently, P-TiNb24O62 presents outstanding electrochemical performances in terms of specific capacity, rate capability and cyclic stability. The reversible capacities of P-TiNb24O62 are, respectively, as large as 296, 277, 261, 245, 222, 202 and 181 mA h g−1 at 0.1, 0.5, 1, 2, 5, 10 and 20 C, which are obviously larger than those of M-TiNb24O62 (258, 226, 210, 191, 166, 147 and 121 mA h g−1). At 10 C, the capacity of P-TiNb24O62 still remains at 183 mA h g−1 over 500 cycles with a decay of only 0.02% per cycle, whereas the corresponding values of M-TiNb24O62 are 119 mA h g−1 and 0.04%. These impressive results indicate that P-TiNb24O62 can be a promising anode material for lithium-ion batteries of electric vehicles.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Gang Fang,Xiaolong Deng,Jizhao Zou,Xierong Zeng
Carbon-coated layer on silicon nanoparticles (SiNPs) can improve the conductivity of SiNPs and affect the cycle performance of SiNPs based anode in lithium ion batteries . SiNPs coated with three different type of carbon (amorphous carbon, order carbon, amorphous/ordered dual carbon) are prepared and their electrochemical properties are investigated. Amorphous carbon (AC) coating shows a better conductivity, while the ordered carbon (OC) coating presents a good volume variation tolerance. Interestingly, amorphous/ordered dual carbon (AC/OC) coating structure simultaneously has the two advantages that amorphous and ordered carbons coating structures have. Hence, as an anode material in lithium ion batteries , AC/OC-coated SiNPs demonstrates an eclectic initial discharge capacity of 3300 mAhg −1 and exhibits an enhanced cycle performance that remains a discharge specific capacity of 1020 mAhg −1 at 200 cycles as well as 650 mAhg −1 after 500 cycles at the current density of 0.36 Ag −1 in the voltage range of 0.01–1.5 V. The preparation procedure of SiNPs@AC/OC is easy for large scale production and SiNPs@AC/OC can be mixed with graphite as composite anode materials for lithium ion batteries in industrial application.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Feng Jin,Chenji Hu,Chenghao Liu,Yi Zheng,Hongwei Chen,Yanbin Shen,Liwei Chen
Sulfurized Polyacrylonitrile (S-PAN) has garnered extensive attention as cathode materials for Li S batteries in recent years because of its advantages such as high sulfur utilization efficiency, high Coulombic efficiency and low self-discharge rate. However, it is difficult to effectively balance the conflict between a high S loading (> 45 wt%) and cycling stability for S-PAN. In this work, we employed an in situ wrapping method to improve the cycling performance of high-S-content S-PAN. Compared with the unwrapped S-PAN, the capacity retention ratio of the wrapped S-PAN cathode increased from 38% to 62% after 100 cycles at 0.25C. The analyzed results suggested that the wrapping layer on the high-S-content S-PAN may compose a mixture of sulfide, inorganic LiB x O y and some organic compounds.
研究领域:
电化学
·
能源材料
·
电池技术
·
材料化学
·
固态离子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 48
·期 12
·8138-8148
·
IF 1.676
Lin Zihan,Min Zhiwen,Chen Wen,Min Feixia,Wu Huimin,Wang Shiquan,Feng Chuanqi,Zhang Yanqing
NiCo 2 S 4 and NiCo 2 S 4 /carbon nanotube (CNT) nanocomposites were synthesized via a one-step hydrothermal approach. As anode materials for lithium-ion batteries (LIBs), the NiCo 2 S 4 /CNT nanocomposite delivers significantly improved cycling stability and excellent rate performance, compared with the pure NiCo 2 S 4 . It retains a discharge capacity of 1405.7 mAh g −1 after 80 cycles at 200 mA g −1 with only 9.2% capacity degradation. Moreover, a discharge capacity of 711.6 mAh g −1 after 390 cycles can still be maintained even at a high current density of 1 A g −1 . The results demonstrate that the NiCo 2 S 4 /CNT nanocomposite holds great potential for applications in LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）