ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Xiaoting Lin,Peng Li,Pengfei Wang,Haoxiang Yu,Shangshu Qian,Miao Shui,Xi Zheng,Nengbing Long,Jie Shu
SrLi 2 Ti 6 O 14 is a novel lithium storage host material. In this work, a series of SrLi 2 Ti 6 O 14 are prepared by a simple solid state reaction method at different calcination temperatures and then used as probable host materials for lithium storage. Evaluations of the electrochemical performance in combination with structural analysis suggest that the calcination temperature dramatically affects the phase purity, particle size and lithium storage capability of SrLi 2 Ti 6 O 14 . It can be found that the optimum calcination temperature for SrLi 2 Ti 6 O 14 is 950 °C. SrLi 2 Ti 6 O 14 formed at 950 °C exhibits the highest lithium storage capacity, the fastest lithium-ion diffusion behavior, the best cycling and rate properties among all the five samples. It reveals an initial charge capacity of 170.3 mAh g −1 at the current density of 50 mA g −1 . After 50 cycles, the reversible capacity can be kept at 155.9 mAh g −1 with excellent capacity retention of 91.9%. Even cycled at 300 mA g −1 , it still can deliver a charge capacity of 141.6 mAh g −1 . In contrast, the SrLi 2 Ti 6 O 14 formed at 800 °C can only deliver a reversible capacity of 71.5 mAh g −1 at 300 mA g −1 . Besides, the electrochemical reaction mechanism between SrLi 2 Ti 6 O 14 and Li is thoroughly investigated by various in-situ and ex-situ techniques. It is found that SrLi 2 Ti 6 O 14 is a zero-strain compound for lithium storage. For the lithium storage process, Rietveld refinement results reveal that lithium ions occupy the 8c, 4b and 4a vacant sites in turns during the discharge process, and the stable framework ensures the structural reversibility during repeated cycles, which is important for SrLi 2 Ti 6 O 14 as a probable host material for high performance lithium-ion 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
Green Energy & Environment
·
2020
·Vol. 7
·期 1
·53-65
·
IF 6.395
Hong-Li Ding,Hai-Tao Yu,Xiao-dong Wang,Chen-Feng Guo,Bing Zheng,Ying Xie,Ting-Feng Yi
SrLi 2 Ti 6 O 14 (SLTO) coated with different amount of ZrO 2 was successfully prepared. The as-obtained composites are stacked by a series of particles with a pure phase structure and a good crystallinity. Furthermore, ZrO 2 coating not only enhances the structural stability of the materials but also facilitates the diffusion of lithium through the SEI film. As a result, the redox polarization was reduced, and the reversibility of the electrochemical reaction was enhanced. Particularly, SLTO-ZrO 2 -2 sample delivers a high initial lithiation capacity of 283.6 mA h g −1 , and the values maintain at 251.7, 228.0, 207.4, 175.3, and 147.7 mA h g −1 at the current densities of 0.13, 0.26, 0.54, 1.31, and 2.62 A g −1 , respectively. Our experiment also confirmed that SLTO materials coated with ZrO 2 are suitable for high power density applications, and the lithiation specific energy efficiency of SLTO-ZrO 2 -2 is 200% as high as that of pure SLTO at a power density of 1257 W kg −1 .
研究领域:
材料科学
·
电化学
·
能源存储
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无机非金属材料
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固态离子学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Shangshu Qian,Haoxiang Yu,Lei Yan,Peng Li,Hua Lan,Haojie Zhu,Nengbing Long,Miao Shui,Jie Shu
High performance Sr 0.95 M 0.05 Li 2 Ti 6 O 14 (M 3+ = Y 3+ , Cr 3+ , La 3+ ) are prepared and evaluated as lithium storage anodes for rechargeable batteries via strontium atoms substituting by heteroatoms . The phase structure and morphology of the as-prepared products are systematically studied by various analytical methods. It demonstrates that Y 3+ , Cr 3+ and La 3+ are successfully introduced into the Sr-site of SrLi 2 Ti 6 O 14 without changing its morphology and size. Galvanostatic discharge/charge tests and rate properties are also investigated between 5.0 and 2.0 V. Contributed to the enhanced electronic conductivity , improved lithium-ion diffusion coefficient and decreased charge-transfer resistance after La 3+ doping, it is found that Sr 0.95 La 0.05 Li 2 Ti 6 O 14 exhibits high reversible capacity and excellent rate capability. It can deliver an initial charge capacity of 159.54 mAh g −1 at 100 mA g −1 with the capacity retention of 94.7% after 100 cycles. Furthermore, it can still deliver an initial capacity of 146.21 mAh g −1 at 700 mA g −1 , with only 8.7% of capacity lost after 1000 cycles. In addition, its structural stability and electrochemical reversibility are also demonstrated by in-situ XRD investigation, with only 2.16% of volume expansion throughout the whole discharge and charge process.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 43
·期 9
·7231-7236
·
IF 2.986
Yaoyao Wu,Shangshu Qian,Hua Lan,Lei Yan,Haoxiang Yu,Xing Cheng,Fanmin Ran,Miao Shui,Jie Shu
In this work, silver and carbon co-coated SrLi 2 Ti 6 O 14 is synthesized by using a solid-state assisted solution method, with glucose as carbon source and silver nitrate as Ag source. The structural and morphological properties of as-prepared samples are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), which confirm that C/Ag composite layer is uniformly coated on the surface of SrLi 2 Ti 6 O 14 . Electrochemical measurements like galvanostatic charge/discharge tests, rate performance, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analysis are also undertaken to evaluate and compare the lithium storage capability of SrLi 2 Ti 6 O 14 before and after coating. According to the results, SrLi 2 Ti 6 O 14 @C/Ag presents enhanced electrochemical capability compared with bare material. It can be found that bare SrLi 2 Ti 6 O 14 only delivers the reversible capacity of 140.32 mA h g −1 with capacity retention of 90.7% at 100 mA g −1 after 200 cycles. In contrast, SrLi 2 Ti 6 O 14 @C/Ag presents the reversible capacity of 151.20 mA h g −1 with only 6.7% capacity loss after 200 cycles. The improvement is owing to the increase of electronic conductivity and the decrease in the redox polarization after coating. In order to further investigate the structural stability of SrLi 2 Ti 6 O 14 @C/Ag, in-situ XRD was performed as well. All the results prove that the C/Ag co-coating has positive effect on the electrochemical performance of SrLi 2 Ti 6 O 14 .
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米材料
✓ 已验证
DOI
高影响因子
Nano Energy
·
2015
·
IF 10.325
Hongsen Li,Laifa Shen,Bing Ding,Gang Pang,Hui Dou,Xiaogang Zhang
To deploy Li-ion batteries for large scale application, it is essential to develop durable electrodes with high power and energy density . Here, we demonstrate that ultralong SrLi 2 Ti 6 O 14 nanowires anode materials synthesized by a simple electrospinning technique are capable of excellent high-rate performance with long stability. The SrLi 2 Ti 6 O 14 nanowires composed of single-crystalline nanoparticles possess the features of “nano-bead-chain” architecture. Used as anode material for lithium ions batteries , the novel SrLi 2 Ti 6 O 14 nanowires exhibits a high reversible capacity of 171.4 mA h g −1 at 0.1 C and retains 96.2 mA h g −1 even at high rate of 20 C. In addition, the capacity is able to stabilize at 101 mA h g −1 after 1000 cycles, corresponding to 0.0086% capacity fading per cycle. Importantly, the Li-storage mechanism of Li 2 SrTi 6 O 14 was revealed by X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES). The greatly improved electrochemical performance arises from the favorable kinetics properties stemming from unique nanoparticle-in-nanowire one-dimensional architecture.
研究领域:
材料科学
·
电化学
·
纳米技术
·
储能
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）