JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2014
·
IF 2.871
Kaiqiang Wu,Dongjie Wang,Xiaoting Lin,Lianyi Shao,Miao Shui,Xinxin Jiang,Nengbing Long,Yuanlong Ren,Jie Shu
In this paper, Na 2 Li 2 Ti 6 O 14 anode materials are synthesized by solid-state reaction and sol–gel method, respectively. Sol–gel formed Na 2 Li 2 Ti 6 O 14 shows smaller particle size (0.05–0.1 μm) than that (0.2–0.4 μm) of samples prepared by solid-state reaction. Electrochemical results show that all the four samples have similar reduction peak at 1.20 V and oxidation peak at 1.35 V with average working potential of 1.28 V. Among all the as-obtained compounds, Na 2 Li 2 Ti 6 O 14 synthesized by sol–gel method at 700 °C shows the highest initial charge specific capacity of 106.6 mA h g −1 . After 40 cycles, the reversible charge capacity can be maintained at 114.7 mA h g −1 . Moreover, this sample shows excellent rate properties with a high reversible charge capacity of 110 mA h g −1 at 160 mA g −1 . The improved electrochemical performance is attributed to the proper particle size, high specific surface area and decreased electrochemical resistances. Therefore, Na 2 Li 2 Ti 6 O 14 prepared from sol to gel technique will be a promising high-power anode material for rechargeable lithium-ion batteries.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2018
·Vol. 6
·期 3
·646-653
·
IF 5.106
Chao Wang,Xing Xin,Miao Shu,Shuiping Huang,Yang Zhang,Xing Li
Carbon anode materials for Li-ion batteries have been operated close to their theoretical rate and cycle limits. Therefore, titanium-based materials have attracted great attention due to their high stability. Here, Na2Li2Ti6O14 nanofibers as anode materials were prepared through a controlled electrospinning method. The Na2Li2Ti6O14 nanofibers presented superior electrochemical performance with high rate capability and long cycle life and can be regarded as a competitive anode candidate for advanced Li-ion batteries. One-dimensional (1D) Na2Li2Ti6O14 nanofibers are able to deliver a capacity of 128.5 mA h g−1 at 0.5C, and demonstrate superior high-rate charge–discharge capability and cycling stability (the reversible charge capacity is 77.8 mA h g−1 with a capacity retention of 99.45% at the rate of 10C after 800 cycles). The 1D structure is considered to contribute remarkably to increased rate capability and stability. This simple and scalable method indicates that the Na2Li2Ti6O14 nanofibers have a practical application potential for high performance lithium-ion batteries.
研究领域:
材料科学
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电化学
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纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2017
·
IF 3.012
Chen Sun,Xing Li,Xianzong Wu,Congcong Zhu,Haoxiang Yu,Zhiyong Guo,Jie Shu
In this paper, a series of Na 2 − 2x Ba x Li 2 Ti 6 O 14 (x = 0, 0.25, 0.5, 0.75, 1) samples are prepared simply by a solid state reaction method, and among them, NaBa 0.5 Li 2 Ti 6 O 14 (x = 0.5) exhibits the smallest particle size and best electrochemical properties . According to the electrochemical results, the initial charge specific capacity of NaBa 0.5 Li 2 Ti 6 O 14 (x = 0.5) reaches 109.6 mAh g − 1 at the current density of 50 mA g − 1 , which is much higher than other samples. The reversible capacity can still be held at 108.6 mAh g − 1 after 50 cycles. In addition, NaBa 0.5 Li 2 Ti 6 O 14 (x = 0.5) also displays outstanding rate property with high charge specific capacities of 128.8, 117.7, 110, 100.2, 98.1 mAh g − 1 at 100, 200, 300, 400 and 500 mA g − 1 , respectively. Our results suggest that the smaller particle size, decreased electrochemical resistance and improved ionic conductivity of Na 2 Li 2 Ti 6 O 14 after Ba doping are main contributing factors in enhancing the lithium storage capability, and among them, NaBa 0.5 Li 2 Ti 6 O 14 (x = 0.5) is a potential anode material for rechargeable lithium-ion batteries.
研究领域:
材料科学
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电化学
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储能
·
锂离子电池
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·Vol. 41
·期 10
·14508-14516
·
IF 2.605
Peng Li,Kaiqiang Wu,Pengfei Wang,Xiaoting Lin,Haoxiang Yu,Miao Shui,Xi Zheng,Nengbing Long,Jie Shu
A novel lithium storage material Na 2 Li 2 Ti 6 O 14 is synthesized and reported as anode material for lithium-ion batteries in this paper. The synthesis of Na 2 Li 2 Ti 6 O 14 is performed by using a simple solid state reaction route . No impurity can be detected in the final product obtained at a temperature of 900 °C. As-formed Na 2 Li 2 Ti 6 O 14 is composed of irregular solid particles with the size ranging from 200 to 400 nm. Using as anode material, Na 2 Li 2 Ti 6 O 14 exhibits flat lithiation/delithiation plateaus with average working potential of 1.28 V. Electrochemical testing results show that Na 2 Li 2 Ti 6 O 14 can deliver a reversible capacity of 74 mA h g −1 with capacity retention of 98.01% upon 50 cycles. Moreover, it also displays excellent rate performance with a charge capacity of 69.5 mA h g −1 at 200 mA g −1 , 64.7 mA h g −1 at 300 mA g −1 , 60.7 mA h g −1 at 400 mA g −1 , and 57.9 mA h g −1 at 500 mA g −1 . The outstanding kinetic behavior is attributed to the high lithium ion diffusion coefficient in Na 2 Li 2 Ti 6 O 14 , which shows the value ranging from 10 −14 to 10 −12 cm 2 s −1 . Owing to the rapid diffusion kinetics , symmetrical structural change at high rates can be observed by in-situ X-ray diffraction during charge–discharge process.
研究领域:
材料科学
·
电化学
·
储能
·
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）