Novel gel polymer electrolyte for high-performance lithium–sulfur batteries

Wang

et al. 2017

Chemistry A European J

130

Developing high-performance solid-state electrolytes is crucial for the innovation of next-generation lithium-sulfur batteries. Herein, a facile method for preparation of a novel gel polymer electrolyte (GPE) based on poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) is reported. Furthermore, Li Al Ti (PO ) (LATP) nanoparticles as the active fillers are uniformly embedded into the GPE to form the final PVDF-HFP/LATP composite gel polymer electrolyte (CPE). Impressively, the obtained CPE demonstrates a high lithium ion transference number of 0.51 and improved electrochemical stability as compared to commercial liquid electrolyte. In addition, the assembled solid-sate Li-S battery with the composite gel polymer electrolyte membrane presents a high initial capacity of 918 mAh g at 0.05 C, and better cycle performance than the counterparts with liquid electrolyte. Our designed PVDF-HFP/LATP composite can be a promising electrolyte for next-generation solid-state batteries with high cycling stability.

Section: Resultsmentioning

confidence: 84%

A Newly Designed Composite Gel Polymer Electrolyte Based on Poly(Vinylidene Fluoride‐Hexafluoropropylene) (PVDF‐HFP) for Enhanced Solid‐State Lithium‐Sulfur Batteries

Wang

et al. 2017

Chemistry A European J

130

“…The gel polymer electrolytes have also been studied in flexible Li–S batteries. Kang and co‐workers studied pentaerythritol tetraacrylate‐based gel polymer electrolyte . The prepared electrolyte showed low interfacial resistance and high ionic conductivity of 1.13 × 10 −2 S cm −1 .…”

Section: Strategy For Future Practical Applicationmentioning

confidence: 99%

Issues and Challenges Facing Flexible Lithium‐Ion Batteries for Practical Application

Cha

Kim

Lee

et al. 2017

Small

176

With the advent of flexible electronics, lithium-ion batteries have become a key component of high performance energy storage systems. Thus, considerable effort is made to keep up with the development of flexible lithium-ion batteries. To date, many researchers have studied newly designed batteries with flexibility, however, there are several significant challenges that need to be overcome, such as degradation of electrodes under external load, poor battery performance, and complicated cell preparation procedures. In addition, an in-depth understanding of the current challenges for flexible batteries is rarely addressed in a systematical and practical way. Herein, recent progress and current issues of flexible lithium-ion batteries in terms of battery materials and cell designs are reviewed. A critical overview of important issues and challenges for the practical application of flexible lithium-ion batteries is also provided. Finally, the strategies are discussed to overcome current limitations of the practical use of flexible lithium-based batteries, providing a direction for future research.

“…However, a critical issue facing the Li anode is the infinite volume change that can breach the in‐situ formed passivation layer over repeated Li stripping/plating cycles as shown in Figure a ,. In consequence, Li 2 S can be continuously deposited onto the Li anode surface over cycling, leading to the irreversible capacity loss and considerably lowered Li + conductivity ,,. In this regard, it occurs to us that to form an ex‐situ porous layer impregnated with Li 2 S might be more effective with two‐fold effects, including (i) low‐order Li 2 S prefilled inside the porous separator will partially sacrifice to chemically interact with polysulfides and physically block the migration of polysulfides towards Li anode; (ii) the loss of Li 2 S in the separator can be replenished by polysulfide disproportion to achieve a stabilized separator/cathode interface.…”

Section: Introductionmentioning

confidence: 99%

A Li₂S‐Based Sacrificial Layer for Stable Operation of Lithium‐Sulfur Batteries

Zhao

Liu

et al. 2018

Energy Tech

The polysulfide shuttle effect forms a formidable barrier for lithium‐sulfur (Li−S) battery technology, as it results in serious side reactions on the anode surface and shortens the battery's cyclability. In this work, we propose a facile yet effective preparation of the Li2S‐based sacrificial layer (LSL) as the separator to retard polysulfide crossover. On one hand, before polysulfides (PS) reach the anode surface and react with Li metal, low‐order Li2S prefilled inside the porous separator can chemically interact with PS and sterically physically block PS diffusion. On the other hand, the loss of Li2S in LSL can be replenished by the chemical disproportion of polysulfides, rendering the LSL with excellent endurance over cycling. With the optimized LSL, the Li/polysulfide battery achieves a stabilized discharge capacity at 25 °C (>950 mAh g−1 for 300 cycles, 0.5 C) and demonstrates an excellent thermal stability even at 55 °C (>870 mAh g−1 for 150 cycles, 1 C). The strategy is further generalized to other sulfur based batteries (i. e. Na−S battery), offering new opportunities to improve high‐energy sulfur‐based energy storage technologies.