Synthesis and performance of solid polymer electrolytes based on chelated boron lithium salts

doi:10.19799/j.cnki.2095-4239.2020.0213

Abstract

Abstract:

All-solid-state lithium-ion batteries have developed rapidly due to improved safety performance and energy storage capabilities. Chelated boron lithium salt is a new type of solid polymer electrolyte (SPE) with a larger anionic radius. It can disrupt the crystallinity of the matrix, such as polyethylene oxide (PEO) or thermoplastic polyurethane (TPU), so that more lithium ions can intercalate into the polymer segments of the matrix and therefore improve the dissociation of lithium-ion in the electrolyte. This study used chelated boron lithium salt and PEO/TPU/BaTiO₃ to form the SPE. Analysis of the morphology and structure, mechanical properties, thermodynamic properties, electrochemical properties, and battery performance showed that the lithium[(1,2-benzenediolate(2)-O,O′)(1,3-malonate-O,O′)] borate (LiBDMB) system gives the best SPE performance. At 60 ℃, the ion conductivity of the LiBDMB SPE system reached the order of 10^-4 S/cm. The discharge capacity of the assembled battery reached 142 mW·h/g at a rate of 0.2 C and performed well after 50 cycles.

Key words: chelated boron lithium salt, solid polymer electrolyte (SPE), LiBDMB, ionic conductivity

CLC Number:

TM 912

Xie WU, Li ZHOU, Zhaoming XUE. Synthesis and performance of solid polymer electrolytes based on chelated boron lithium salts[J]. Energy Storage Science and Technology, 2021, 10(1): 96-103.

Figures/Tables 10

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

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Fig.7

Fig.8

Table 1

Ionic Conductivity of SPE"

基体掺杂的锂盐名称	电解质膜的厚度/cm	离子电导率/S·cm^-1
$L i B F 4$	0.028	$2.8 × 10 - 5$
LiBBB	0.026	$6.1 × 10 - 5$
LiBMB	0.028	$5.9 × 10 - 5$
LiBDMB	0.027	$1.9 × 10 - 4$

Table 1

Fig.9

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