scholarly journals High Temperature Resistant Separator of PVDF-HFP/DBP/C-TiO2 for Lithium-Ion Batteries

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2813 ◽  
Author(s):  
Haijuan Li ◽  
Ling Li ◽  
Shuaizhi Zheng ◽  
Xinming Wang ◽  
Zengsheng Ma
Keyword(s):  
Titanium Dioxide ◽  
Ionic Conductivity ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Room Temperature ◽  
Lithium Ion ◽  
Inversion Method ◽  
Tio2 Nanofibers ◽  
Electrolyte Uptake ◽  
Composite Separator

To improve the thermal shrinkage and ionic conductivity of the separator for lithium-ion batteries, adding carboxylic titanium dioxide nanofiber materials into the matrix is proposed as an effective strategy. In this regard, a poly(vinylidene fluoride-hexafluoro propylene)/dibutyl phthalate/carboxylic titanium dioxide (PVDF-HFP/DBP/C-TiO2) composite separator is prepared with the phase inversion method. When the content of TiO2 nanofibers reaches 5%, the electrochemical performance of the battery and ion conductivity of the separator are optimal. The PVDF-HFP/DBP/C-TiO2 (5%) composite separator shows about 55.5% of porosity and 277.9% of electrolyte uptake. The PVDF-HFP/DBP/C-TiO2 (5%) composite separator has a superior ionic conductivity of 1.26 × 10 −3 S cm−1 and lower interface impedance at room temperature, which brings about better cycle and rate performance. In addition, the cell assembled with a PVDF-HFP/DBP/C-TiO2 separator can be charged or discharged normally and has an outstanding discharge capacity of about 150 mAh g−1 at 110 °C. The battery assembled with the PVDF-HFP/DBP/C-TiO2 composite separator exhibits excellent electrochemical performance under high and room temperature environments.

Polymer-in-salt solid electrolytes for lithium-ion batteries

2019 ◽  
Vol 12 (06) ◽  
pp. 1930006 ◽  
Author(s):  
Chengjun Yi ◽  
Wenyi Liu ◽  
Linpo Li ◽  
Haoyang Dong ◽  
Jinping Liu
Keyword(s):  
Ionic Conductivity ◽  
Lithium Ion Batteries ◽  
Smart Grids ◽  
Solid Electrolytes ◽  
Room Temperature ◽  
Lithium Salt ◽  
Lithium Ion ◽  
Solid Polymer Electrolytes ◽  
Solid Polymer ◽  
Polymer Lithium Ion Batteries

Solid-state polymer lithium-ion batteries with better safety and higher energy density are one of the most promising batteries, which are expected to power future electric vehicles and smart grids. However, the low ionic conductivity at room temperature of solid polymer electrolytes (SPEs) decelerates the entry of such batteries into the market. Creating polymer-in-salt solid electrolytes (PISSEs) where the lithium salt contents exceed 50[Formula: see text]wt.% is a viable technology to enhance ionic conductivity at room temperature of SPEs, which is also suitable for scalable production. In this review, we first clarify the structure and ionic conductivity mechanism of PISSEs by analyzing the interactions between lithium salt and polymer matrix. Then, the recent advances on polyacrylonitrile (PAN)-based PISSEs and polycarbonate derivative-based PISSEs will be reviewed. Finally, we propose possible directions and opportunities to accelerate the commercializing of PISSEs for solid polymer Li-ion batteries.

Enhanced electrochemical capabilities of lithium ion batteries by structurally ideal AAO separator

2015 ◽  
Vol 3 (20) ◽  
pp. 10715-10719 ◽  
Author(s):  
Yong-keon Ahn ◽  
Junwoo Park ◽  
Dalwoo Shin ◽  
Sanghun Cho ◽  
Si Yun Park ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Current Distribution ◽  
Aluminium Oxide ◽  
Lithium Ion ◽  
Lithium Metal ◽  
Capacity Fading ◽  
Uniform Current

Nanoporous anodic aluminium oxide (AAO) enables the direct utilization of lithium metal as an ideal anode, owing to a uniform current distribution. The electrochemical performance of the AAO separator is superior to commercial polypropylene, in terms of ionic conductivity, discharge capacity, and capacity fading.

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.

scholarly journals Effect of SiO2 Nanoparticles on the Performance of PVdF-HFP/Ionic Liquid Separator for Lithium-Ion Batteries

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 926 ◽  
Author(s):  
Stefano Caimi ◽  
Antoine Klaue ◽  
Hua Wu ◽  
Massimo Morbidelli
Keyword(s):  
Ionic Conductivity ◽  
Lithium Ion Batteries ◽  
Polymer Matrix ◽  
Room Temperature ◽  
Lithium Ion ◽  
Sio2 Nanoparticles ◽  
Alumina Nanoparticles ◽  
Promising Alternative ◽  
The Matrix ◽  
Novel Method

Safety concerns related to the use of potentially explosive, liquid organic electrolytes in commercial high-power lithium-ion batteries are constantly rising. One promising alternative is to use thermally stable ionic liquids (ILs) as conductive media, which are however, limited by low ionic conductivity at room temperature. This can be improved by adding fillers, such as silica or alumina nanoparticles (NPs), in the polymer matrix that hosts the IL. To maximize the effect of such NPs, they have to be uniformly dispersed in the matrix while keeping their size as small as possible. In this work, starting from a water dispersion of silica NPs, we present a novel method to incorporate silica NPs at the nanoscale level (<200 nm) into PVdF-HFP polymer clusters, which are then blended with the IL solution and hot-pressed to form separators suitable for battery applications. The effect of different amounts of silica in the polymer matrix on the ionic conductivity and cyclability of the separator is investigated. A membrane containing 10 wt.% of silica (with respect to the polymer) was shown to maximize the performance of the separator, with a room temperature ionic conductivity of of 1.22 mS cm − 1 . The assembled half-coin cell with LiFePO 4 and Li as the cathode and the anode exhibited a capacity retention of more than 80% at a current density of 2C and 60 ∘ C.

Eco-friendly polyvinyl alcohol/cellulose nanofiber–Li+ composite separator for high-performance lithium-ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 97912-97920 ◽  
Author(s):  
Chuanting Liu ◽  
Ziqiang Shao ◽  
Jianquan Wang ◽  
Chengyi Lu ◽  
Zhenhua Wang
Keyword(s):  
Thermal Stability ◽  
Ionic Conductivity ◽  
Polyvinyl Alcohol ◽  
Lithium Ion Batteries ◽  
High Performance ◽  
Lithium Ion ◽  
Cellulose Nanofiber ◽  
Composite Separator

A PVA/CNF–Li composite separator presented excellent porosity, ionic conductivity, electrolyte wettability, thermal stability and remarkable cycling ability.

scholarly journals Aramid Nanofibers Reinforced Cellulose Paper-Based Lithium-Ion Battery Separator with Improved Safety and Cycling Stability

2021 ◽  
Author(s):  
Sufeng Zhang ◽  
Jin Luo ◽  
Min Du ◽  
Hongying Hui
Keyword(s):  
Electrochemical Performance ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Interfacial Resistance ◽  
Safety Hazards ◽  
Battery Separator ◽  
Electrolyte Uptake ◽  
Dimensional Shrinkage ◽  
Composite Separator

Abstract Commercial polyolefin separators with poor electrolyte wettability and inferior thermal stability have hampered the development of advanced lithium-ion batteries (LIBs) due to their unsatisfied electrochemical performance and severe safety hazards. Herein, a novel paper-based composite separator composed of electrolyte-affinitive cellulose fibers (CFs) and thermally stable aramid nanofibers (ANFs) was successfully fabricated through the traditional papermaking method. It was found that the incorporation of ANFs played crucial roles in improving the defects of pure CF separator such as large-sized pores, low mechanical strength and high flammability. Specifically, the CF/ANF composite separator with 20 wt.% ANFs (CF/ANF-20) possessed narrow micropores, satisfied tensile strength (33MPa), excellent thermal resistance (without dimensional shrinkage up to 200 °C) and flame retardancy, greatly enhancing the safe operation of battery. In addition, benefiting from the highly porous structure and exceptional electrolyte affinity of CF separator, the CF/ANF-20 composite separator exhibited appropriate porosity and superior electrolyte wettability, which brought about a high electrolyte uptake (157%), thus endowing it with better ionic conductivity (0.75 mS cm−1) and lower interfacial resistance than that of commercial polypropylene (PP) separator. Accordingly, the LiFePO4/Li half cells using CF/ANF-20 separator delivered outstanding rate capability and stable cycling performance. All results indicate that the CF/ANF-20 separator with great balance between the electrochemical performance and safety is an intriguing candidate for advanced LIBs.

Polydopamine coated TiO2 nanofibers filled polyethylene oxide hybrid electrolyte for efficient and durable all solid state lithium ion batteries

Nanoscale ◽  
2021 ◽  
Author(s):  
Erqing Zhao ◽  
Yudi Guo ◽  
Awei Zhang ◽  
Hongliang Wang ◽  
Guang-ri Xu
Keyword(s):  
Solid State ◽  
Ionic Conductivity ◽  
Solid Electrolyte ◽  
Lithium Ion Batteries ◽  
Polyethylene Oxide ◽  
Lithium Ion ◽  
Promising Candidate ◽  
Tio2 Nanofibers ◽  
Interfacial Compatibility

Polyethylene oxide (PEO) solid electrolyte is a promising candidate for all solid state lithium-ion batteries (ASSLIBs), but its low ionic conductivity and poor interfacial compatibility against lithium limit the rate...

Preparation and electrochemical performance of ZrO2 nanoparticle-embedded nonwoven composite separator for lithium-ion batteries

2015 ◽  
Vol 41 (10) ◽  
pp. 14223-14229 ◽  
Author(s):  
Wei Xiao ◽  
Yaqun Gong ◽  
Hong Wang ◽  
Lina Zhao ◽  
Jianguo Liu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Composite Separator
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