scholarly journals Nanofiber-Based Membrane Separators for Lithium-ion Batteries

2015 ◽  
Vol 1718 ◽  
pp. 157-161 ◽  
Author(s):  
Mataz Alcoutlabi ◽  
Hun Lee ◽  
Xiangwu Zhang
Keyword(s):  
Lithium Ion Batteries ◽  
Polyvinylidene Fluoride ◽  
High Performance ◽  
Lithium Ion ◽  
Cellulose Membrane ◽  
Acetate Solution ◽  
Electrolyte Uptake ◽  
Fibrous Cellulose ◽  
Fibrous Membranes ◽  
Cellulose Membranes

ABSTRACTNanofiber-based membranes were prepared by two different methods for use as separators for Lithium-ion batteries (LIBs). In the first method, Electrospinning was used for the fabrication of Polyvinylidene fluoride PVDF nanofiber coatings on polyolefin microporous membrane separators to improve their electrolyte uptake and electrochemical performance. The nanofiber-coated membrane separators show better electrolyte uptake and ionic conductivity than that for the uncoated membranes. In the second method, Forcespinning® (FS) was used to fabricate fibrous cellulose membranes as separators for LIBs. The cellulose fibrous membranes were made by the Forcespinning® of a cellulose acetate solution precursor followed by a subsequent alkaline hydrolysis treatment. The results show that the fibrous cellulose membrane-based separator exhibits high electrolyte uptake and good electrolyte/electrode wettability and therefore can be a good candidate for high performance and high safety LIB separators.

scholarly journals Design of A High Performance Zeolite/Polyimide Composite Separator for Lithium-Ion Batteries

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 764 ◽  
Author(s):  
Yanling Li ◽  
Xiang Wang ◽  
Jianyu Liang ◽  
Kuan Wu ◽  
Long Xu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Lithium Ion Batteries ◽  
Phase Inversion ◽  
High Performance ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycle Performance ◽  
Electrolyte Uptake ◽  
Composite Separator ◽  
Free Transport

A zeolite/polyimide composite separator with a spongy-like structure was prepared by phase inversion methods based on heat-resistant polyimide (PI) polymer matrix and ZSM-5 zeolite filler, with the aim to improve the thermal stability and electrochemical properties of corresponding batteries. The separator exhibits enhanced thermal stability and no shrinkage up to 180 °C. The introduction of a certain number of ZSM-5 zeolites endows the composite separator with enhanced wettability and electrolyte uptake, better facilitating the free transport of lithium-ion. Furthermore, the composite separator shows a high ionic conductivity of 1.04 mS cm−1 at 25 °C, and a high decomposition potential of 4.7 V. Compared with the PP separator and pristine PI separator, the ZSM-5/PI composite separator based LiFePO4/Li cells have better rate capability (133 mAh g−1 at 2 C) and cycle performance (145 mAh g-1 at 0.5 C after 50 cycles). These results demonstrate that the ZSM-5/PI composite separator is promising for high-performance and high-safety lithium-ion batteries.

Preparation of porous fluorinated polyimide separator for lithium-ion batteries by non-solvent induced phase separation process

2021 ◽  
pp. 095400832098815
Author(s):  
Yake Shi ◽  
Biao Yuan ◽  
Yanzhen He ◽  
Cuijia Duan ◽  
Shuo Yan ◽  
...  
Keyword(s):  
Phase Separation ◽  
Lithium Ion Batteries ◽  
High Performance ◽  
Retention Rate ◽  
Lithium Ion ◽  
Promising Candidate ◽  
Fluorinated Polyimide ◽  
Electrolyte Uptake ◽  
Phase Separation Process ◽  
Interconnected Structure

A series of novel porous fluorinated polyimide (FPI) separators containing trifluoromethyl group (–CF3) were prepared by the non-solvent induced phase separation (NIPS) strategy. The prepared FPI separator with 60% molar content (fluorinated dianhydride: non-fluorinated dianhydride: diamine = 60: 40: 100) of fluorinated groups (FPI-60%) could stably exist in the electrolyte as a LIBs separator. The resultant FPI-60% separator possesses high thermal stability with the Tg of 289.4°C and exhibits no shrinkage even at 200°C. The morphologies of the FPI-60% separators were adjusted by introducing small molecular non-solvent additives-ethanol, and the FPI-60% separators present the spongy-like and interconnected structure with different porosity as the amount of ethanol changed from 1 wt% to 10 wt%. The FPI-60% separators display excellent electrolyte uptake with 170%–200% and the ionic conductive could reach 1.17 mS/cm which is four times approximately than that of the PP separator. The lithium-ion batteries (LIBs) using FPI-60% separators with 10 wt% ethanol added show better rate capacities (102.8 mAh/g, 70.8 mAh/g of PI-10 and PP separator at 2 C, respectively) and the capacity retention rate is 93.2% after 50 cycles. The results prove that the porous FPI separator is a promising candidate for high-performance LIBs.

scholarly journals Recent Development of Polyvinylidene Fluoride/Cellulose Membranes Electrolyte Separator for Lithium Ion Batteries

2021 ◽  
Vol 1096 (1) ◽  
pp. 012144
Author(s):  
E R Dyartanti ◽  
N Sunaryati ◽  
R R Alhakim ◽  
L N Putri ◽  
A Y M Putri ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Polyvinylidene Fluoride ◽  
Lithium Ion ◽  
Cellulose Membranes

High-performance SiO/C/G Composite Anode for Lithium Ion Batteries

2013 ◽  
Vol 28 (9) ◽  
pp. 943-948 ◽  
Author(s):  
Chang-Chuan SHI ◽  
Xue-Lin YANG ◽  
Lu-Lu ZHANG ◽  
Yong-Tao ZHOU ◽  
Zhao-Yin WEN
Keyword(s):  
Lithium Ion Batteries ◽  
High Performance ◽  
Lithium Ion ◽  
Composite Anode

Octagonal Flower‐like CuO/C/NF Nanocomposite as a Self‐Supporting Anode for High‐Performance Lithium‐Ion Batteries

2020 ◽  
Vol 7 (19) ◽  
pp. 4038-4046
Author(s):  
Ruili Zhang ◽  
Xuehong Li ◽  
Liping Ni ◽  
Anjian Xie ◽  
Panpan Li ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
High Performance ◽  
Lithium Ion ◽  
Supporting Anode
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