Synergistic effect of soy protein isolate and montmorillonite on interface stability between polymer electrolyte and ele
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ORIGINAL PAPER
Synergistic effect of soy protein isolate and montmorillonite on interface stability between polymer electrolyte and electrode of all-solid lithium-ion battery Da Zhou 1 & Libo Li 1 & Jintian Du 1 & Mo Zhai 1 Received: 27 July 2020 / Revised: 23 September 2020 / Accepted: 4 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In response to the safety performance of liquid electrolytes in traditional lithium-ion batteries, we have prepared a new type of polymer electrolyte. In this paper, PVDF is used as the polymer electrolyte matrix, bio-based filler soybean protein isolate (SPI), and inorganic filler montmorillonite (MMT) as additional groups. In addition, the effects of the addition of soybean protein isolate (SPI) and montmorillonite (MMT) on the polymer electrolyte ion conductivity, lithium ion migration number, and electrode interface performance were investigated. After the test, it was found that the polymer electrolyte membrane with MMT and SPI had an ion conductivity of 2.56 × 10−4 S cm−1 at room temperature, an electrochemical stability window of 5.1 V, and a Li+ transfer number of 0.77. When assembling Li/LiTFSI-MMT-SPI-PVDF/Li batteries, the symmetric battery has a stable electrode interface because it can circulate stably for more than 100 h at a very small polarization voltage. Keywords Bio-based . Inorganic particle . Polymer electrolyte . All-solid-state battery
Introduction The characteristics of high energy density and light weight make lithium-ion batteries (LIBs) occupy an advantage in the energy field; it has been widely used in the portable electronics and hybrid/electric vehicle industries as emerging energy storage devices in the past few decades [1, 2]. In the LIB system, the electrolyte plays a vital role in battery performance. In recent years, there have been many spontaneous combustion incidents of new energy vehicles [3–5], so more attention have been paid to the safe electrolytes which keep the battery safety. The liquid electrolyte is commercially used as an electrolyte. When an organic liquid electrolyte is improperly used, short-circuited, overcharged, or locally overheated, it can easily cause fire or even explosion. Solid polymer electrolyte (SPE) has the characteristics of good nonvolatile and good safety. Because of its low flammability, * Libo Li [email protected] 1
Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China
wide electrochemical window, and good cycle thermal stability, it is expected to replace organic liquid electrolytes [6]. In rechargeable lithium-ion batteries, solid polymer electrolytes serve the dual roles of electrolyte and separator, so the choice of polymer for SPE needs to meet the following requirements [7, 8]: (1) The ability to dissolve lithium salts: there should be ordered polar groups similar to –O–, C=O and C ≡ N in the selected polymer
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