HIERARCHICAL Li4Ti5O12 MICROSPHERES AS A HIGH POWER ANODE MATERIAL FOR LITHIUM ION BATTERIES

2013 ◽  
Vol 01 (04) ◽  
pp. 1340013
Author(s):  
HONGJUN LUO ◽  
HONGSEN LI ◽  
LAIFA SHEN ◽  
PING NIE ◽  
JIE WANG ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Large Scale ◽  
Discharge Rate ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Electrochemical Analysis ◽  
High Rate ◽  
Diffraction Field ◽  
Hydrothermal Route

In this paper, hierarchical Li 4 Ti 5 O 12 microspheres were successfully synthesized in a large scale via a facile hydrothermal route. X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy were used to characterize the obtained Li 4 Ti 5 O 12 microspheres and the results indicate that the monodispersed Li 4 Ti 5 O 12 microspheres with ca. 2 μm in diameter was assembled by well-crystalline nanoparticles. Electrochemical analysis indicated that the Li 4 Ti 5 O 12 microspheres have superior rate capability and cycling performance. At the charge–discharge rate of 0.2, 1, 2, 5, 10 and 20 C, the discharge capacities of Li 4 Ti 5 O 12 microspheres are 169.2, 163.5, 158.3, 136.4, 117.6 and 94.3 mAh g−1, respectively. Excellent capacity retention of 98.7% was achieved after 100 cycles at 1 C rate and it can still maintained 91% even at high rate of 10 C.

Advanced amorphous nanoporous stannous oxide composite with carbon nanotubes as anode materials for lithium-ion batteries

RSC Advances ◽  
2014 ◽  
Vol 4 (78) ◽  
pp. 41281-41286 ◽  
Author(s):  
Wenjuan Jiang ◽  
Weiyao Zeng ◽  
Zengsheng Ma ◽  
Yong Pan ◽  
Jianguo Lin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Anode Materials ◽  
Electronic Conductivity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Liquid Electrolyte ◽  
High Rate ◽  
High Rate Capability ◽  
Active Materials

Good electronic conductivity and mechanical properties are obtained by introducing CNTs into an ANSO@CNTs anode material. The anode possesses a super cycling performance and a high rate capability because the porous structure facilitates liquid electrolyte diffusion into active materials.

Improved rate capability and cycling stability of bicontinuous hierarchical mesoporous LiFePO4/C microbelts for lithium-ion batteries

2017 ◽  
Vol 41 (21) ◽  
pp. 12969-12975 ◽  
Author(s):  
Yue Zhang ◽  
Yudai Huang ◽  
Yakun Tang ◽  
Hongyang Zhao ◽  
Yanjun Cai ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Cycling Stability ◽  
High Rate ◽  
High Reversible Capacity ◽  
Electrospinning Method ◽  
First Time

Bicontinuous hierarchical mesoporous LiFePO4/C microbelts have been synthesized using a simple dual-solvent electrospinning method for the first time. The sample exhibits a high reversible capacity (153 mA h g−1 at 0.5C), and an excellent high rate cycling performance.

Improved electrochemical performance of LiNi0.8Co0.15Al0.05O2/LiMn1∕3Ni1∕3Co1∕3O2 with core-shell structure synthesized by a coprecipitation and spray pyrolysis process

2018 ◽  
Vol 11 (04) ◽  
pp. 1850083 ◽  
Author(s):  
Hongyong Ouyang ◽  
Xinhai Li ◽  
Zhixing Wang ◽  
Huajun Guo ◽  
Wenjie Peng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Performance ◽  
Spray Pyrolysis ◽  
Electrochemical Impedance ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Core Shell ◽  
Pyrolysis Process ◽  
Spray Pyrolysis Process

Core-shell composite material LiNi[Formula: see text]Co[Formula: see text]Al[Formula: see text]O2/LiMn[Formula: see text]Ni[Formula: see text]Co[Formula: see text]O2 (NCA/NCM) was synthesized via a coprecipitation and spray pyrolysis process. The properties of pristine LiNi[Formula: see text]Co[Formula: see text]Al[Formula: see text]O2 (NCA) and Core-shell NCA/NCM were investigated by scanning electron microscopy, transmission electron microscopy, Galvanostatic cell cycling and electrochemical impedance spectroscopy. Results showed that the Core-shell NCA/NCM exhibited enhanced rate capability and cycling performance than the pristine NCA. The improved electrochemical performance is due to the fact that the NCM layer can stabilize the crystal structure of materials and suppress the deterioration of lithium ion diffusing ability during electrode process.

Enhanced Lithium Ion Storage by Titanium Dioxide Addition to Zinc Telluride-Based Alloy Composites

2020 ◽  
Vol 20 (11) ◽  
pp. 6815-6820
Author(s):  
Quoc Hanh Nguyen ◽  
Seongjoon So ◽  
Jaehyun Hur
Keyword(s):  
Electron Microscopy ◽  
Current Density ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
High Energy ◽  
High Rate ◽  
Electrochemical Performances ◽  
Potential Candidate ◽  
X Ray

A nanostructured ZnTe–TiO2–C composite is synthesized, via a two-step high-energy mechanical milling process, for use as a new promising anode material in Li-ion batteries (LIBs). X-ray diffraction and X-ray photoelectron spectroscopy results confirm the successful formation of ZnTe alloy and rutile TiO2 phases in the composites using ZnO, Te, Ti, and C as the starting materials. Scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray spectroscopy mapping measurements further reveal that ZnTe and TiO2 nanocrystals are uniformly dispersed in an amorphous carbon matrix. The electrochemical performances of ZnTe–TiO2–C and other control samples were investigated. Compared to ZnTe–TiO2 and ZnTe-C composites, the ZnTe– TiO2–C nanocomposite exhibits better performance, thereby delivering a high reversible capacity of 561 mAh g−1 over 100 cycles and high rate capability at a high current density of 5 A g−1 (79% capacity retention of its capacity at 0.1 A g−1). Furthermore, the long-term cyclic performance of ZnTe–TiO2–C at a current density of 0.5 A g−1 shows excellent reversible capacity of 528 mAh g−1 after 600 cycles. This improvement can be attributed to the presence of a TiO2-C hybrid matrix, which acts as a buffering matrix that effectively mitigates the large volume changes of active ZnTe during repeated cycling. Overall, the ZnTe–TiO2–C nanocomposite is a potential candidate for high-performance anode materials in LIBs.

Synthesis of Sandwich-Like Carbon@SnO2@Carbon Composite Hollow Microspheres with High Rate Capability and Stability for Lithium-Ion Batteries

2013 ◽  
Vol 467 ◽  
pp. 172-178
Author(s):  
Jin Liang ◽  
Dong Yang Zhang ◽  
Shu Jiang Ding
Keyword(s):  
Electron Microscopy ◽  
High Current Density ◽  
Hollow Spheres ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Rate ◽  
Cyclic Voltammogram ◽  
Polystyrene Spheres ◽  
Charge Voltage ◽  
Carbon Hollow Spheres

In this work, we prepared the sandwich-like carbon@SnO2@carbon hollow spheres by templating against polystyrene spheres. The hollow spheres are characterized by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD). The electrochemical performance as the anodes of lithium-ions batteries are studied by the cyclic voltammogram (CV) and galvanostatic discharge-charge voltage tests. Because of the interesting structure, the as prepared carbon@SnO2@carbon hollow spheres deliver a reversible capacity of 492 mA h g-1after 50 cycles at a high current density of 400 mA g-1.

Crystallized lithium titanate nanosheets prepared via spark plasma sintering for ultra-high rate lithium ion batteries

2019 ◽  
Vol 7 (2) ◽  
pp. 455-460 ◽  
Author(s):  
Junqin Li ◽  
Tengfei Zhang ◽  
Cuiping Han ◽  
Hongfei Li ◽  
Ruiying Shi ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Spark Plasma Sintering ◽  
Rate Capability ◽  
Lithium Ion ◽  
Lithium Titanate ◽  
Cycling Performance ◽  
High Rate ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Titanate Nanosheets

Crystalline lithium titanate nanosheets are successfully prepared by the spark plasma sintering (SPS) method at 500 °C within only 5 minutes and deliver excellent rate capability and cycling performance.

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