PEI-SiO2 composite membranes with high thermal stability: Synthesis by self-assembled in situ growth and application in lithium-ion batteries

2020 ◽  
pp. 095400832096455
Author(s):  
Wei Song ◽  
Weiwei Cui ◽  
Xu Wang ◽  
Zeyu Lin ◽  
Wei Deng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Lithium Ion Batteries ◽  
Composite Membrane ◽  
Retention Rate ◽  
Lithium Ion ◽  
Composite Membranes ◽  
High Porosity ◽  
Electrolyte Uptake ◽  
Electrochemical Window

To improve the safety of lithium-ion batteries (LIBs), a polyether amide–silica (PEI-SiO2) composite membrane was developed by the in situ hydrolysis of tetraethylorthosilicate (TEOS) and its subsequent self-assembly on the surface of PEI fibers. Because of the presence of the SiO2 shell, the PEI-SiO2 composite membrane exhibited good thermal stability at high temperatures. The composite membrane did not change its color and size after heating at 200°C for 1 h as well as exhibited excellent flame retardancy. Moreover, the membrane maintained its high porosity even after the introduction of shell layers. The electrolyte is completely absorbed in the membrane within 0.5 s. The electrolyte uptake was up to 625%, and the ionic conductivity was up to 1.9 mS/cm at room temperature. Compared to the polyolefin membrane and the pure PEI membrane, the PEI-SiO2 composite membrane showed higher electrochemical stability, with an electrochemical window of up to 5.5 V. The battery assembled with the composite membrane showed excellent cycle stability, and the capacity retention rate was as high as 98.6% after 50 cycles. The LIBs based on the PEI-SiO2 composite membrane exhibited safe operation and high electrochemical performance, thus highlighting the applicability of the composite membrane in high-power batteries.

scholarly journals A Review on Inorganic Nanoparticles Modified Composite Membranes for Lithium-Ion Batteries: Recent Progress and Prospects

Membranes ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 78 ◽  
Author(s):  
Muhammad Rehman Asghar ◽  
Muhammad Tuoqeer Anwar ◽  
Ahmad Naveed ◽  
Junliang Zhang
Keyword(s):  
Lithium Ion Battery ◽  
Mechanical Stability ◽  
Lithium Ion ◽  
Composite Membranes ◽  
Inorganic Nanoparticles ◽  
High Porosity ◽  
Excellent Thermal Stability ◽  
Inorganic Particles ◽  
Inorganic Particle ◽  
Electrolyte Uptake

Separators with high porosity, mechanical robustness, high ion conductivity, thin structure, excellent thermal stability, high electrolyte uptake and high retention capacity is today’s burning research topic. These characteristics are not easily achieved by using single polymer separators. Inorganic nanoparticle use is one of the efforts to achieve these attributes and it has taken its place in recent research. The inorganic nanoparticles not only improve the physical characteristics of the separator but also keep it from dendrite problems, which enhance its shelf life. In this article, use of inorganic particles for lithium-ion battery membrane modification is discussed in detail and composite membranes with three main types including inorganic particle-coated composite membranes, inorganic particle-filled composite membranes and inorganic particle-filled non-woven mates are described. The possible advantages of inorganic particles application on membrane morphology, different techniques and modification methods for improving particle performance in the composite membrane, future prospects and better applications of ceramic nanoparticles and improvements in these composite membranes are also highlighted. In short, the contents of this review provide a fruitful source for further study and the development of new lithium-ion battery membranes with improved mechanical stability, chemical inertness and better electrochemical properties.

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 A Novel Electrospinning Polyacrylonitrile Separator with Dip-Coating of Zeolite and Phenoxy Resin for Li-ion Batteries

Membranes ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 267
Author(s):  
Danxia Chen ◽  
Xiang Wang ◽  
Jianyu Liang ◽  
Ze Zhang ◽  
Weiping Chen
Keyword(s):  
Thermal Stability ◽  
Ionic Conductivity ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Dip Coating ◽  
High Rate ◽  
Great Promise ◽  
Good Thermal Stability ◽  
Electrolyte Uptake

Commercial separators (polyolefin separators) for lithium-ion batteries still have defects such as low thermostability and inferior interface compatibility, which result in serious potential safety distress and poor electrochemical performance. Zeolite/Polyacrylonitrile (Z/PAN) composite separators have been fabricated by electrospinning a polyacrylonitrile (PAN) membrane and then dip-coating it with zeolite (ZSM-5). Different from commercial separators, the Z/PAN composite separators exhibit high electrolyte uptake, excellent ionic conductivity, and prominent thermal stability. Specifically, the Z/PAN-1.5 separator exhibits the best performance, with a high electrolyte uptake of 308.1% and an excellent ionic conductivity of 2.158 mS·cm−1. The Z/PAN-1.5 separator may mechanically shrink less than 10% when held at 180 °C for 30 min, proving good thermal stability. Compared with the pristine PAN separator, the Li/separator/LiFePO4 cells with the Z/PAN-1.5 composite separator have excellent high-rate discharge capacity (102.2 mAh·g−1 at 7 C) and favorable cycling performance (144.9 mAh·g−1 at 0.5 C after 100 cycles). Obviously, the Z/PAN-1.5 separator holds great promise in furthering the safety and performance of lithium-ion batteries.

scholarly journals In situ synthesis of expanded graphite embedded with amorphous carbon-coated aluminum particles as anode materials for lithium-ion batteries

2020 ◽  
Vol 9 (1) ◽  
pp. 436-444 ◽  
Author(s):  
Xin Zhao ◽  
Tingkai Zhao ◽  
Xiarong Peng ◽  
Lei Yang ◽  
Yuan Shu ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Amorphous Carbon ◽  
Anode Materials ◽  
Retention Rate ◽  
Specific Capacity ◽  
Chemical Vapour ◽  
Lithium Ion ◽  
Expanded Graphite ◽  
Carbon Coated

AbstractExpanded graphite embedded with amorphous carbon-coated aluminum particle (C@Al–EG) composites were in situ synthesized by chemical vapour deposition (CVD) and ball-milling methods using EG and metallic aluminum as raw materials. Using the characterization and analysis of scanning electron microscopy, X-ray diffraction, alternating current impedance and first charge–discharge curves, the different Al contents in C@Al–EG composites were studied, and the experimental results show that the best performing content for Al was 30 wt%. The C@Al–EG composites exhibited high capacity, excellent cycle stability and rate performance as anode materials for lithium-ion batteries. At a current density of 100 mA h/g, the first reversible capacity of C@Al–EG composites was 401 mA h/g, and the decreasing speed of capacity was slow, with the specific capacity remaining at 381 mA h/g after 50 cycles. The retention rate was up to 95%.

An electrospun lignin/polyacrylonitrile nonwoven composite separator with high porosity and thermal stability for lithium-ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (122) ◽  
pp. 101115-101120 ◽  
Author(s):  
Man Zhao ◽  
Jing Wang ◽  
Chuanbin Chong ◽  
Xuewen Yu ◽  
Lili Wang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Composite Fiber ◽  
High Porosity ◽  
Composite Separator

In this work, lignin/polyacrylonitrile composite fiber-based nonwoven membranes (L–PANs) were prepared by electrospinning with dispersing different amounts of lignin in the polyacrylonitrile (PAN) solutions.

Preparation and evaluation of a separator with an asymmetric structure for lithium-ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (107) ◽  
pp. 105461-105468 ◽  
Author(s):  
Yanqing Wang ◽  
Shaoyin Zhu ◽  
Deye Sun ◽  
Yongcheng Jin
Keyword(s):  
Thermal Stability ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Asymmetric Structure ◽  
High Porosity ◽  
Interface Properties ◽  
Preparation And Evaluation

Asymmetric separators with high porosity and thermal stability can provide different functionalities corresponding to the different interface properties at the cathode and anode surfaces.

Effect of additives on wettability, thermal stability and electrochemical properties of γ-Al2O3-coating separator for lithium-ion batteries

2021 ◽  
pp. 1-15
Author(s):  
Ji Yan ◽  
Zhen Li ◽  
Min-Yun Wang ◽  
Kezheng Gao ◽  
Yong Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Thermal Shrinkage ◽  
Al2o3 Coating ◽  
Effect Of Additives ◽  
Electrolyte Uptake ◽  
Superior Cycling Stability ◽  
Battery Application

Abstract Physical properties of separator, as important parameters in affecting electrochemical performance and safety of lithium ion batteries, should be paid more attention. In this study, three kinds of surfactants and dispersants were adopted to investigate their effects on thermal stability, wettability and electrochemical properties of γ-Al2O3 coating polyethylene-based separator. The experimental results showed that with the synergistic helpfulness of PEG-2000 as surfactant and D-067 as dispersant, γ-Al2O3 coating polyethylene separator demonstrates superior thermal stability (no significant thermal shrinkage after heating at 120°C), electrolyte uptake ability and improved wettability (contact angle of 27.9°). Based on further testing results in Li//MCMB coin cells, the cell with γ-Al2O3 coating polyethylene separator exhibits higher capacity and superior cycling stability than other two bare counterparts separators at room temperature after 200 cycles. These results demonstrate that the as-prepared separator is highly promising for lithium ion battery application with the help of suitable surfactant and dispersant.

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