TY - JOUR
T1 - Functionality of 1-Butyl-2,3-Dimethylimidazolium Bromide (BMI-Br) as a Solid Plasticizer in PEO-Based Polymer Electrolyte for Highly Reliable Lithium Metal Batteries
AU - Kim, Eunhui
AU - Jamal, Hasan
AU - Jeon, Injun
AU - Khan, Firoz
AU - Chun, Sang Eun
AU - Kim, Jae Hyun
N1 - Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023/12/15
Y1 - 2023/12/15
N2 - To address the challenges associated with solid polymer electrolytes, flame-retardant organic ionic plastic crystals (OIPCs) have been utilized as a solid plasticizer in composite polymer electrolytes (CPEs). In this study, 1-butyl-2,3-dimethylimidazolium bromide (BMI-Br) is used as an OIPC material. BMI-Br and LiTFSI are initially mixed in an acetonitrile (ACN) organic solvent for a certain time. Anion exchange takes place in this mixing, replacing the Br− in BMI-Br with TFSI−. As a result, BMI-TFSI and Li-Br are formed. Here, BMI-TFSI acts as an ionic liquid, while Li-Br serves as a salt. The 10% BMI-Br content (BMI-Br-10 CPE) exhibits significant ionic conductivity (σ = 2.34 × 10−3 S cm−1 at 30 °C), wide window (up to 4.57 V), and flame retardancy. Furthermore, the BMI-Br-10 CPE demonstrates galvanostatic lithium plating stripping cycling stability at 100 and 300 µA cm−2 for 800 and 500 h against Li-metal, respectively, without a significant overpotential shooting. Furthermore, at 60 °C, the BMI-Br-10 CPE in [LiFePO4/BMI-Br-10/Li] batteries demonstrates an initial capacity of 146.9 mAh g−1, capacity retention of 99.7% and high coulombic efficiency (99.5%) after 300 cycles at 1C.
AB - To address the challenges associated with solid polymer electrolytes, flame-retardant organic ionic plastic crystals (OIPCs) have been utilized as a solid plasticizer in composite polymer electrolytes (CPEs). In this study, 1-butyl-2,3-dimethylimidazolium bromide (BMI-Br) is used as an OIPC material. BMI-Br and LiTFSI are initially mixed in an acetonitrile (ACN) organic solvent for a certain time. Anion exchange takes place in this mixing, replacing the Br− in BMI-Br with TFSI−. As a result, BMI-TFSI and Li-Br are formed. Here, BMI-TFSI acts as an ionic liquid, while Li-Br serves as a salt. The 10% BMI-Br content (BMI-Br-10 CPE) exhibits significant ionic conductivity (σ = 2.34 × 10−3 S cm−1 at 30 °C), wide window (up to 4.57 V), and flame retardancy. Furthermore, the BMI-Br-10 CPE demonstrates galvanostatic lithium plating stripping cycling stability at 100 and 300 µA cm−2 for 800 and 500 h against Li-metal, respectively, without a significant overpotential shooting. Furthermore, at 60 °C, the BMI-Br-10 CPE in [LiFePO4/BMI-Br-10/Li] batteries demonstrates an initial capacity of 146.9 mAh g−1, capacity retention of 99.7% and high coulombic efficiency (99.5%) after 300 cycles at 1C.
KW - anion exchange
KW - composite polymer electrolytes
KW - flame retardants
KW - organic ionic plastic crystal
KW - solid electrolyte interfaces
UR - http://www.scopus.com/inward/record.url?scp=85175576757&partnerID=8YFLogxK
U2 - 10.1002/aenm.202301674
DO - 10.1002/aenm.202301674
M3 - Article
AN - SCOPUS:85175576757
SN - 1614-6832
VL - 13
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 47
M1 - 2301674
ER -