ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Heng Zhang,Yi Lu,Chang-Dong Gu,Jian-Bin Cai,Xiu-Li Wang,Jiang-Ping Tu
Amorphous Ni–P–C films are fabricated by combining the electrodeposition of Ni–P films from a eutectic-based ionic liquid and the direct current magnetron sputtering of amorphous carbon top-layer. The carbon top-layer with a thickness of about 10 nm is homogeneously coated on the surface of the Ni–P films. A comparison study is undertaken between Ni–P and Ni–P–C films to evaluate the microstructure and the electrochemical performances of the composite films as anode materials for lithium ion batteries , which allow the decoupling of the effect of the carbon layer . It is found that at lower discharge–charge current densities, the cyclability of both Ni–P and Ni–P–C films is similar. As the discharge–charge current density increases, the Ni–P–C film exhibits improved capability and reversibility over the Ni–P film. The Ni–P–C film delivers an initial discharge capacity of 1060 mAh g −1 at 250 mA g −1 and the capacity retention after 50 cycles is 62%, much higher than that of the Ni–P film (51%). The cyclability of Ni–P–C film at different discharge–charge current densities from 200 to 500 mA g −1 is also much better than those of Ni–P film. This study indicates that the introduction of a carbon top-layer on Ni–P film could significantly improve the electrochemical performances due to the decreased interface electric resistance and the structure stability.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
薄膜技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Siwei Jiang,Jiaxu Cheng,G.P. Nayaka,Peng Dong,Yingjie Zhang,Yubo Xing,Xiaolei Zhang,Ning Du,Zhongren Zhou
Nanoscaling and alloying techniques for silicon-based materials are widely recognized as vital technological approaches to effectively address the challenges associated with volume expansion and poor conductivity in silicon anodes. Developing short process, cost-effective preparation methods and shape controllable silicon-based materials is expected to improve their cyclability. Herein, utilizing the superior electrical conductivity of copper metal and its stable alloy interaction with silicon, the present study introduced a simple synthetic process by incorporating nanoscale Cu 2 O into a SiO 2 dioxide matrix under a combination of hydrothermal reaction with Cu(NO 3 ) 2 as the copper source and further sintering treatment. Under the conditions of a Cu:Si molar ratio to 3:8 under 850 °C by 2.6 V of constant electrolsyis for 3 h, straight silicon nanowires with a cross-sectional distribution were obtained. The Cu 3 Si alloy particles were enriched around silicon nanowires. Experimental testing was conducted to evaluate the electrochemical storage capabilities of Cu 3 Si/Si nanowires, resulting in an initial specific capacity of 2630.7 mAh g -1 and an initial coulombic efficiency of 88.94%. After 100 charge-discharge cycles, the discharge specific capacity reached 1675.4 mAh g -1 , with a capacity retention rate of 66.20%. This work demonstrates the effectiveness of constructing a Cu 3 Si conductive network for solving the volume expansion and conductivity problems of Si and the distinctive Cu 3 Si/Si architecture offers an exemplary model for the design of silicon-based composite anodes for advanced lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
复合材料
·
半导体材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Wenyuan He,Xuejun Zheng,Jinfeng Peng,Qiang Zhang,Dazhao Pei,Xinyang Yan
A facile one-step solid-phase synthesis strategy is developed for synthesizing a binder-free molybdenum disulfide/carbon fibers paper (MoS 2 /CFP) anode. The microstructure, composition, morphology and electrochemical performances were investigated. It is found that the thin MoS 2 layers are well anchored on the interlaced carbon fibers to form MoS 2 /CFP, which has mesoporous structure and large specific surface area of ∼18.8 m 2 g -1 . As a result, the obtained MoS 2 /CFP anode exhibits a reversible capacity of 261 mAh·g −1 with 31.2% loading ratio of MoS 2 . After subtracting the capacity of CFP, the MoS 2 in the composite anode delivers a reversible capacity of 539 mAh·g −1 and shows better cycle stability than commercial MoS 2 after 100 cycles at 100 mA g −1 . The remarkable electrochemical performances could be attributed to the buffer space among carbon fibers for the volume changes of MoS 2 as well as the highly conductive carbon fibers network, suggesting that the MoS 2 /CFP is a promising binder-free anode for lithium-ion batteries.
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 POWER SOURCES
·
2014
·
IF 5.211
Kaiqiang Wu,Jie Shu,Xiaoting Lin,Lianyi Shao,Peng Li,Miao Shui,Mengmeng Lao,Nengbing Long,Dongjie Wang
A series of Na x Li 4−x Ti 6 O 14 (0 ≤ x ≤ 4) are prepared by solid-state method and their structures, morphologies and electrochemical properties are compared by changing the Na/Li atomic ratio. It can be found that two single-phase samples of Na 2 Li 2 Ti 6 O 14 and Na 4 Ti 6 O 14 and three multi-phase samples of Li 4 Ti 6 O 14 (Li 4 Ti 5 O 12 /TiO 2 ), NaLi 3 Ti 6 O 14 (Na 2 Li 2 Ti 6 O 14 /Li 4 Ti 5 O 12 /TiO 2 ) and Na 3 LiTi 6 O 14 (Na 2 Li 2 Ti 6 O 14 /Na 2 Ti 3 O 7 ) can be formed by using a stoichiometric ratio of starting materials based on the formula of Na x Li 4−x Ti 6 O 14 . Besides, different Na/Li atomic ratios in Na x Li 4−x Ti 6 O 14 also induce the morphology evolution shifting from round-shape to polyhedron-shape, and then to square-shape with the increase of Na content. Electrochemical tests show that Li 4 Ti 6 O 14 delivers the highest charge capacities of 116 mAh g −1 at 100 mA g −1 , 91.5 mAh g −1 at 200 mA g −1 , 77.5 mAh g −1 at 300 mA g −1 and 66.9 mAh g −1 at 400 mA g −1 among five samples. For comparison, Na 4 Ti 6 O 14 only reveals the reversible capacities of 38.6 mAh g −1 at 100 mA g −1 , 30.2 mAh g −1 at 200 mA g −1 , 24.8 mAh g −1 at 300 mA g −1 and 20.9 mAh g −1 at 400 mA g −1 . It suggests that Li 4 Ti 6 O 14 is the most potential lithium storage material among all the Na x Li 4−x Ti 6 O 14 samples.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
功能材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Lili Chai,Qunting Qu,Longfei Zhang,Ming Shen,Li Zhang,Honghe Zheng
Chitosan was applied as the electrode binder material for a spherical graphite anode in lithium-ion batteries. Compared to using poly (vinylidene fluoride) (PVDF) binder, the graphite anode using chitosan exhibited enhanced electrochemical performances in terms of the first Columbic efficiency, rate capability and cycling behavior. With similar specific capacity, the first Columbic efficiency of the chitosan-based anode is 95.4% compared to 89.3% of the PVDF-based anode. After 200 charge–discharge cycles at 0.5 C , the capacity retention of the chitosan-based electrode showed to be significantly higher than that of the PVDF-based electrode. Electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) measurements were carried out to investigate the formation and evolution of the solid electrolyte interphase (SEI) formed on the graphite electrodes. The results show that a thin, homogenous and stable SEI layer is formed on the graphite electrode surface with chitosan binder compared with that using the conventional PVDF binder
研究领域:
电化学
·
材料科学
·
能源存储
·
电池技术
·
纳米材料
·
界面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jiaxu Cheng,Jinghan Qiao,Zongyang Yang,Bowen Zhu,Jianguo Duan,Ding Wang,Rui Huang,Yingjie Zhang,Zhongren Zhou,Peng Dong
One of the key efficient strategies to optimize the silicon micro-structure and to improve the lithium-storage electrochemical performance is to introduce the metallic phase into silicon matrix to realize the silicon-metal recombination as well as the nanocrystallization of silicon structure. The present research introduced metallic titanium to synthesis TiSi 2 /Si nanocomposites by the aid of electrolyzing SiO 2 /TiO 2 in molten salt. The reduced nanocomposites exhibited excellent lithiation stability with the initial discharging specific capacity of 2107 mA h/g and the first columbic efficiency of 89.96%. Particularly benefiting from the compositional TiSi 2 phase and the structural superiority of silicon nanowires surrounded by the alloyed nanoparticles , the as-obtained anode also delivered a high rate capacity. The major objective of this study is to establish the technology for molten salt electrolytic preparation of TiSi 2 /Si nanocomposites for lithium-ion batteries and further to offer solutions for modifying the silicon anode materials .
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机非金属材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·Vol. 44
·期 39
·22250-22262
·
IF 4.084
Hongri Wan,Xiaofang Hu
Nitrogen/sulfur co-doped disordered porous biocarbon was facilely synthesized and applied as anode materials for lithium/sodium ion batteries. Benefiting from high nitrogen (3.38 wt%) and sulfur (9.75 wt%) doping, NS 1-1 as anode materials showed a high reversible capacity of 1010.4 mA h g −1 at 0.1 A g −1 in lithium ion batteries . In addition, it also exhibited excellent cycling stability, which can maintain at 412 mAh g -1 after 1000 cycles at 5 A g −1 . As anode materials of sodium ion batteries , NS 1-1 can still reach 745.2 mA h g −1 at 100 mAg -1 after 100 cycles. At a high current density (5 A g -1 ), the reversible capacity is 272.5 mA h g −1 after 1000 cycles, which exhibits excellent electrochemical performance and cycle stability. The preeminent electrochemical performance can be attributed to three effects: (1) the high level of sulfur and nitrogen; (2) the synergic effect of dual-doping heteroatoms; (3) the large quantity of edge defects and abundant micropores and mesopores , providing extra Li/Na storage regions. This disordered porous biocarbon co-doped with nitrogen/sulfur exhibits unique features, which is very suitable for anode materials of lithium/sodium ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能碳材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 9
·4604-4609
·
IF 2.936
Lei Lü,Hongming Lou,Yinglin Xiao,Guangzhao Zhang,Chaoyang Wang,Yonghong Deng
Triblock copolymer polydopamine-polyacrylic-polyoxyethylene (PDA-PAA-PEO) with excellent performance as a binder for silicon anodes was synthesized. Its structure was confirmed by 1H-NMR, FTIR and UV-vis spectroscopy. Results of electrochemical measurements indicated that a silicon anode based on PDA-PAA-PEO binder exhibited excellent cycle performance with a reversible capacity of 1597 mA h g−1 after 200 cycles at a current density of 0.5 C, much better than that of an electrode based on a polyvinylidene-fluoride binder. Improvement of the cycle performance and reversible capacity for silicon anodes could be attributed to the strong adhesive and high ion conductivity of PDA-PAA-PEO.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子化学
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xiaozhong Zhou,Zhaoyi Qi,Yuyuan Jiang,Pengfei Yan,Juanxia Ding,Haiyan Wang,Hongkai Lu,Dongxu Liu,Kaifa Dong,Yougen Tang,Dongfei Sun,Ziqiang Lei
SiO x is regarded as a promising anode material for the next-generation lithium-ion batteries with high energy density. However, the reduplicative volume changes during cycling cause the pulverizations of Si, leading to decreased utilization of active Si component and poor cycling performance. Herein, a facile and scalable Fe-Cr decorating strategy is reported to boost the lithium storage of SiO x anode. Our comprehensive characterizations indicate that there are strong interactions between Fe-Cr and SiO x during a facile ball milling process. After cycling, Fe-Cr nanoparticles are dispersed in the in-situ formed lithium silicates and Li 2 O matrix, which can maintain superior conductivity of lithium ion and electron for the active components through point-to-point connections. This unique structure boosts the electrochemical de-alloying process of the low-valent Li x Si (0 ≤ x ≤ 2), and increases effective utilization of the active Si component during cycling, resulting in improvement of reversible capacity and cycling stability. This bm SiO x -FeCr electrode can deliver high reversible specific capacity (1370 m Ah g −1 at 200 mA g −1 ), good rate capability (653.8 m Ah g −1 at 2000 mA g −1 ), and superior cycling stability. This work provides a promising route for improving the utilization of active Si component and the structural stability of SiO x -based anodes.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
电池技术
·
固态物理
✓ 已验证
DOI
高影响因子
Energy Technology
·
2019
·Vol. 7
·期 6
·1801022
·
IF 3.163
Yang Liu,Qiang Ru,Yuqing Gao,Ping Gao,Fuming Chen,Lingzhi Zhao,Xianhua Hou
Antimony and red phosphorus (RP) hybrid is harvested via a facile mechanical milling strategy. Simultaneously, graphene sheets are introduced to boost the electronic transmission and mitigate the agglomeration of particles. In contrast to pristine Sb and RP electrodes, Sb/P/C hybrid affords comparably promising electrochemical performances. As anodes for lithium-ion batteries, Sb/P/C electrode depicts a reversible capacity of 869 mAh g −1 under 200 mA g −1 after 50 cycles and an excellent rate stability such as 452 mAh g −1 at 3200 mA g −1 . When used for sodium-ion batteries, the hybrid also shows moderate capacities of 544.8 and 511 mAh g −1 at the current of 50 and 200 mA g −1 after 50 cycles, respectively. These excellent properties can be ascribed to the synergetic effect of decreased particle size of milled Sb/P/C, large contact area, adequate energy storage sites, and enhanced electrical conductivity.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
无机化学
·
固体物理
·
电池技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 16
·13384-13391
·
IF 3.289
Bin Lu,Renzong Hu,Jiangwen Liu,Jun Liu,Hui Wang,Min Zhu
To improve the coulombic efficiency (CE) and cycle life of SnO2 anode in lithium ion batteries, SnO2–Cu–graphite composites with dual scale embedding structure are synthesized by ball milling. The SnO2–Cu composite, in which SnO2 nanoparticles with grain size less than 10 nm are uniformly dispersed in inactive nanocrystalline Cu matrix, is firstly obtained by milling the mixture of SnO2 and Cu nanopowders (molar ratio 1 : 2), and then further milling with graphite (C) to obtain SnO2–Cu–C composite with microsized graphite sheets as matrix of SnO2–Cu composite. The 50 h-milled SnO2–Cu composite exhibits higher initial CE (76.0 ± 1.5%) and subsequent CE than 50 h-milled SnO2. Furthermore, the SnO2–Cu–C composite anode is capable of retaining a maximum charge capacity of 450.8 mA h g−1 at 100 mA g−1 after 80 cycles with a capacity retention ratio of 74.4%, displaying superior cyclic stability to as-milled SnO2, SnO2–Cu and SnO2–C composites. The improved CE and cycleability are attributed to the unique dual scale embedding structure that offers good conductivity of electron and lithium ion as well as the nanostructure stability of active materials. This unique composite structure might be extended to other high-capacity anode materials, to achieve high performance lithium ion batteries.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
锂离子电池
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 15
·期 5
·4722-4738
·
IF 1.5
Wen Liu,Yueli Shi,Quanchao Zhuang,Yongli Cuiab,Zhicheng Ju,Yanhua Cui
The effect of ethylene glycol bis(propionitrile) ether(DENE) as a novel electrolyte additive on the electrochemical performance of a graphite anode was studied in this paper. Fourier transform infrared spectroscopy(FTIR), charge/discharge tests, cyclic voltammetry(CV), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), and electrochemical impedance spectroscopy(EIS) were used to investigate the SEI film and the cycle performance of graphite anode. The initial charge capacities of the graphite electrode in the electrolytes without and with 1% DENE were 319 mAhg −1 and 349 mAhg −1 , respectively. After 60 cycles, the charge capacities without and with 1% DENE were 315 mAhg -1 and 350 mAhg -1 , respectively. and the capacity retention rates were 95.8% and 98.1%, respectively. DENE promoted the formation of a thin and uniform SEI layer and improved the stability of the electrode. The addition of DENE effectively improved the electrochemical performance of graphite anodes.
研究领域:
电化学
·
材料科学
·
能源存储
·
电池技术
·
表面化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）