Microporous bayberry-like nano-silica fillers enabling superior performance gel polymer electrolyte for lithium metal ba
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Microporous bayberry-like nano-silica fillers enabling superior performance gel polymer electrolyte for lithium metal batteries Jian Guo1, Hongbin Hou2, Junmei Cheng1, Chengdong Wang2, Qinggang Wang2,*, Hongguang Sun1,*, and Xiao Chen2,* 1
School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, People’s Republic of China 2 Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, People’s Republic of China
Received: 10 April 2020
ABSTRACT
Accepted: 9 October 2020
Unlike conventional organic liquid electrolytes, which have uncontrollable lithium dendrite growth and serious safety concerns, gel polymer electrolytes (GPEs) are widely considered to be one of the best candidates for the next generation of high energy density lithium metal batteries (LMBs). However, the challenge of maintaining high mechanical strength and good electrochemical stability simultaneously has not yet been met by these materials. Therefore, in this paper, we designed bayberry silica nanoparticles (BSNPs) with ultra-high specific surface area and compounded them with polyvinylidene fluoride – hexafluoropropylene (PVDF-HFP) (BSNPs-CPE) to effectively solve these problems. The results show that compared with the blank sample and industrial silica nanoparticles (SNPs-CPE) composite electrolyte, BSNPs-CPE not only has higher absorption rate and ion conductivity but also has a higher lithium-ion migration. In addition, due to the good compatibility between BSNPs-CPE and lithium metal, a stable SEI layer can be generated. At the same time, lithium metal batteries of BSNPs-CPE exhibit good cycling performance and rate capacity. After 300 cycles, the excellent capacity of up to 147.2 mAh g- 1 remains at the current rate of 1.0 C. More encouragingly, the capacity of 119 mAh g- 1 was obtained at the current rate of 10 C, which keeps much higher than that of the blank sample (76.2 mAh g- 1). This kind of nanostructure with micropore and high specific surface area provides important significance for the design of high-performance lithium metal battery.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Jian Guo and Hongbin Hou contributed equally to this work.
Address correspondence to E-mail: [email protected]; [email protected]; [email protected]
https://doi.org/10.1007/s10854-020-04645-4
J Mater Sci: Mater Electron
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Introduction
Lithium metal batteries (LMBs) have been extensively studied as the next generation of high energy density energy storage systems due to their characteristics of the highest theoretical specific capacity (3860 mAh g- 1) and the lowest redox potential (3.040 V vs. standard hydrogen electrode) [1, 2]. The traditional liquid organic electrolyte not only has good ionic conductivity, but also has good compatibility with the electrode, which plays an important role in LMBs. However, the use of liquid organic electrolytes can easily lead to leakage and combustion. Furthermore, uncontrollable short c
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