Synergism of surface group transfer and in-situ growth of silica-aerogel induced high-performance modified polyacrylonitrile separator for lithium/sodium-ion batteries

Zhang, Lupeng; Feng, Guanhua; Li, Xinle; Cui, Shizhong; Ying, Si-Wei; Feng, Xiangming; Mi, Liwei; Chen, Weihua

doi:10.1016/j.memsci.2019.02.002

Cited by 61 publications

(25 citation statements)

References 48 publications

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“…The mechanical behavior also gradually changes from pure elastic deformation of ceramics to typical deformation of (in)organic hybrids with the increment of PVDF-HFP content. The tensile strengths of the SPH2 and SPH3 membranes are similar to that of pure polymer separators consisting of polyacrylonitrile, [41] polyvinyli-dene difluoride, [42] or polyvinyl alcohol. [43] As shown in Figure 3b, a 1 kg oil barrel could be lifted with a SPH2 strip membrane, devoid of any fracture.…”

mentioning

confidence: 73%

Silica Nanowires Reinforced with Poly(vinylidene fluoride‐co‐hexafluoropropylene): Separator for High‐Performance Lithium Batteries

Shi

Yan

et al. 2021

ChemNanoMat

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Separators are key components that physically separate and chemically connect the anode and cathode to guarantee the safety and cycle stability of batteries. Herein, based on the building concept of a bird's nest, we have developed separators comprising SiO 2 nanowires reinforced with poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP). In particular, the hybrid separators with 39% of PVDF-HFP exhibit much enhanced tensile strength, Young's moduli, flexibility, and elongation as a result of a strong crosslink effect, compared to bare SiO 2 nanowire separator, while yet maintaining excellent electrolyte wettability, high ionic conductivity, and wide electrochemical window. Moreover, the hybrid separators also demonstrate excellent thermal stability and dendrite suppression capability. Lithium metal batteries assembled using the hybrid separators with LiFePO 4 as the cathode achieve excellent rate performance and cyclic stability. The discharge capacities attained at a current density equivalent to 0.2 C and 2 C rate are 157 and 126 mAh g À 1 , respectively. A capacity of 99 mAh g À 1 is still maintained at 2 C rate after 500 cycles. This study illuminates SiO 2 nanowires reinforced with PVDF-HFP as promising separators for high-energy, high-power and safe lithium batteries.

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confidence: 73%

Silica Nanowires Reinforced with Poly(vinylidene fluoride‐co‐hexafluoropropylene): Separator for High‐Performance Lithium Batteries

Shi

Yan

et al. 2021

ChemNanoMat

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“…The higher wettability and electrolyte uptake with the electrolyte lead to a faster ion conduction through the separator, and as a result, the CSP separator shows an enhanced ion conductivity of 2.5 mS cm –1 compared with the PP separator (1.0 mS cm –1 , Figure S3). The thermal stability of separators plays an important role in battery safety; − as demonstrated in Figure S4, the PP separator undergoes a severe shrinkage at 175 °C and nearly burns out at 200 °C. In contrast, the thermal shrinkage rate of the CSP separator is only 53% at 200 °C.…”

Section: Resultsmentioning

confidence: 99%

A Prelithiation Separator for Compensating the Initial Capacity Loss of Lithium-Ion Batteries

Rao

et al. 2021

ACS Appl. Mater. Interfaces

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Lithium loss during the initial charge process inevitably reduces the capacity and energy density of lithium-ion batteries. Cathode additives are favored with respect to their controllable prelithiation degree and scalable application; however, the insulating nature of their delithiation products retards electrode reaction kinetics in subsequent cycles. Herein, we propose a prelithiation separator by modifying a commercial separator with a Li2S/Co nanocomposite to compensate for the initial capacity loss. The Li2S/Co coating layer extracts active lithium ion during the charge process and shows a delithiation capacity of 993 mA h g–1. When paired with a LiFePO4|graphite full cell, the reversible capacity is increased from 112.6 to 150.3 mA h g–1, leading to a 29.5% boost in the energy density. The as-prepared pouch cell also demonstrates a stable cycling performance. The excellent electrochemical performance and the scalable production of the prelithiation separator reveal its great potential in lithium-ion battery industry application.

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“…Nylon-11 polymer fibers implemented using novel, tailored co-solvent polymerization with the complete elimination of a phase with a pseudo-hexagonal structure led to good piezoelectric effects, ionic conductivity, and inhibited electron cross-over due to its good suppleness and wettability [386]. Upright growth of silica aerogel over a polyacrylonitrile (PAN) membrane separator results in finer thermal stability (~280 °C) at low contact angles, enabling optimum cell performance in Li and Na metal anodes [387]. Water-soluble cellulose separators modified with carboxyl methyl and hydroxy groups are used in solid-state batteries.…”

Section: Modifying Other Componentsmentioning

confidence: 99%

Growth Mechanism of Micro/Nano Metal Dendrites and Cumulative Strategies for Countering Its Impacts in Metal Ion Batteries: A Review

et al. 2021

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Metal-ion batteries are capable of delivering high energy density with a longer lifespan. However, they are subject to several issues limiting their utilization. One critical impediment is the budding and extension of solid protuberances on the anodic surface, which hinders the cell functionalities. These protuberances expand continuously during the cyclic processes, extending through the separator sheath and leading to electrical shorting. The progression of a protrusion relies on a number of in situ and ex situ factors that can be evaluated theoretically through modeling or via laboratory experimentation. However, it is essential to identify the dynamics and mechanism of protrusion outgrowth. This review article explores recent advances in alleviating metal dendrites in battery systems, specifically alkali metals. In detail, we address the challenges associated with battery breakdown, including the underlying mechanism of dendrite generation and swelling. We discuss the feasible solutions to mitigate the dendrites, as well as their pros and cons, highlighting future research directions. It is of great importance to analyze dendrite suppression within a pragmatic framework with synergy in order to discover a unique solution to ensure the viability of present (Li) and future-generation batteries (Na and K) for commercial use.

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Synergism of surface group transfer and in-situ growth of silica-aerogel induced high-performance modified polyacrylonitrile separator for lithium/sodium-ion batteries

Cited by 61 publications

References 48 publications

Silica Nanowires Reinforced with Poly(vinylidene fluoride‐co‐hexafluoropropylene): Separator for High‐Performance Lithium Batteries

Silica Nanowires Reinforced with Poly(vinylidene fluoride‐co‐hexafluoropropylene): Separator for High‐Performance Lithium Batteries

A Prelithiation Separator for Compensating the Initial Capacity Loss of Lithium-Ion Batteries

Growth Mechanism of Micro/Nano Metal Dendrites and Cumulative Strategies for Countering Its Impacts in Metal Ion Batteries: A Review

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