UV-assisted synthesis of surface modified mesoporous TiO2/G microspheres and its electrochemical performances in lithium ion batteries

2017 ◽  
Vol 392 ◽  
pp. 897-903 ◽  
Author(s):  
Xiaoling Tong ◽  
Min Zeng ◽  
Jing Li ◽  
Fuyun Li
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Mesoporous Tio2 ◽  
Electrochemical Performances ◽  
Surface Modified

scholarly journals Facile Synthesis of Multi-channel Surface Modified Amorphous Iron Oxide Nanospheres as a High-performance Anode Material for Lithium-ion Batteries

2021 ◽  
Author(s):  
Shijin Yu ◽  
Wenzhen Zhu ◽  
Zhuohao Xiao ◽  
Jiahao Tong ◽  
Quanya Wei ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Surface Structure ◽  
Lithium Ion Batteries ◽  
High Performance ◽  
Lithium Ion ◽  
Electrochemical Performances ◽  
Lithium Ions ◽  
Channel Surface ◽  
Voltage Hysteresis ◽  
Surface Modified

Abstract The application of iron oxide as anode of lithium-ion batteries is hindered by its poor cycle stability, low rate performance and large voltage hysteresis. To address these problems, multi-channel surface modified amorphous Fe2O3 nanospheres were synthesized by using a facile hydrothermal method, which exhibited outstanding electrochemical performances. According to crystalline state and microstructure, it was found that surface structure of the amorphous Fe2O3 nanospheres can be controlled by adjusting the reaction time, due to the synergistic effect of ripening and hydrogen ion etching. Owing to the isotropic nature and the absence of grain boundaries, the amorphous Fe2O3 nanospheres could withstand high strains during the intercalation of lithium ions. Meanwhile, the multi-channel surface structure can not only increase the contact area between Fe2O3 nanospheres and electrolyte, but also reserve space for volume expansion after lithium storage, thereby effectively alleviating the volume change during the intercalation-deintercalation of lithium ions. As confirmed by the Galvanostatic intermittent titration analysis results, the amorphous Fe2O3 electrode had higher Li+ diffusion coefficient than the crystalline counterpart. As a result, the multi-channel surface modified amorphous Fe2O3 electrode exhibited higher specific capacity, more stable cycle performance and narrower voltage hysteresis. It is believed that amorphous metal oxides have great potential as high-performance anode of next-generation lithium-ion batteries.

scholarly journals Application of PVDF Organic Particles Coating on Polyethylene Separator for Lithium Ion Batteries

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3125 ◽  
Author(s):  
Yuan Wang ◽  
Chuanqiang Yin ◽  
Zhenglin Song ◽  
Qiulin Wang ◽  
Yu Lan ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Polyvinylidene Fluoride ◽  
Retention Rate ◽  
Rate Capability ◽  
Lithium Ion ◽  
Organic Polymer ◽  
Electrochemical Performances ◽  
Capacity Retention ◽  
Organic Particles ◽  
Surface Modified

Surface coating modification on a polyethylene separator serves as a promising way to meet the high requirements of thermal dimensional stability and excellent electrolyte wettability for lithium ion batteries (LIBs). In this paper, we report a new type of surface modified separator by coating polyvinylidene fluoride (PVDF) organic particles on traditional microporous polyethylene (PE) separators. The PE separator coated by PVDF particles (PE-PVDF separator) has higher porosity (61.4%), better electrolyte wettability (the contact angle to water was 3.28° ± 0.21°) and superior ionic conductivity (1.53 mS/cm) compared with the bare PE separator (51.2%, 111.3° ± 0.12°, 0.55 mS/cm). On one hand, the PVDF organic polymer has excellent organic electrolyte compatibility. On the other hand, the PVDF particles contain sub-micro spheres, of which the separator can possess a large specific surface area to absorb additional electrolyte. As a result, LIBs assembled using the PE-PVDF separator showed better electrochemical performances. For example, the button cell using a PE-PVDF as the separator had a higher capacity retention rate (70.01% capacity retention after 200 cycles at 0.5 C) than the bare PE separator (62.5% capacity retention after 200 cycles at 0.5 C). Moreover, the rate capability of LIBs was greatly improved as well—especially at larger current densities such as 2 C and 5 C.

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