TY - JOUR

T1 - Phase behavior and electrochemical properties of lithium-doped N-methyl-N-propyl-piperidinium perchlorate

AU - Kyzlasova, Daria

AU - Ulihin, Artem

AU - Uvarov, Nikolai

N1 - This research was funded by the Russian Science Foundation (grant no. 20–13-00302).

PY - 2024/12

Y1 - 2024/12

N2 - There are cathode materials for lithium-ion batteries that can operate at high voltages. However, they cannot be used in electrochemical power sources without electrolytes with a wide electrochemical window. Organic ionic plastic crystals (OIPC) are good candidates as the main component of the electrolytes for electrochemical power sources due to their properties. OIPC based on quaternary ammonium salts are stable in a wide temperature range, non-volatile, non-flammable, and have good electrochemical stability and relatively high ionic conductivity. In this work, several electrolytes were investigated in the binary system N-methyl-N-propylpiperidinium perchlorate ([N13pip]ClO4)–lithium perchlorate. The formation of a new phase was revealed, which is a double salt of the composition 2[N13pip]ClO4·3LiClO4. The expected phase diagram of the system is constructed. Electrolytes [N13pip]ClO4–LiClO4 containing 0.07–0.29 mol fraction LiClO4 have a high ionic conductivity ~ 10−3 S/cm at temperatures above 110–120 °C. It was shown that the electrochemical stability window of the obtained electrolytes reaches 4.9 V. Electrolytes with a mole fraction of LiClO4x = 0.07 and 0.18 showed electrochemical stability for 150 charge–discharge cycles with lithium electrodes at a current density of 0.05 mA/cm2. Thus, the solid electrolytes in the [N13pip]ClO4–LiClO4 system have a high lithium conductivity and may be used in intermediate-temperature lithium batteries.

AB - There are cathode materials for lithium-ion batteries that can operate at high voltages. However, they cannot be used in electrochemical power sources without electrolytes with a wide electrochemical window. Organic ionic plastic crystals (OIPC) are good candidates as the main component of the electrolytes for electrochemical power sources due to their properties. OIPC based on quaternary ammonium salts are stable in a wide temperature range, non-volatile, non-flammable, and have good electrochemical stability and relatively high ionic conductivity. In this work, several electrolytes were investigated in the binary system N-methyl-N-propylpiperidinium perchlorate ([N13pip]ClO4)–lithium perchlorate. The formation of a new phase was revealed, which is a double salt of the composition 2[N13pip]ClO4·3LiClO4. The expected phase diagram of the system is constructed. Electrolytes [N13pip]ClO4–LiClO4 containing 0.07–0.29 mol fraction LiClO4 have a high ionic conductivity ~ 10−3 S/cm at temperatures above 110–120 °C. It was shown that the electrochemical stability window of the obtained electrolytes reaches 4.9 V. Electrolytes with a mole fraction of LiClO4x = 0.07 and 0.18 showed electrochemical stability for 150 charge–discharge cycles with lithium electrodes at a current density of 0.05 mA/cm2. Thus, the solid electrolytes in the [N13pip]ClO4–LiClO4 system have a high lithium conductivity and may be used in intermediate-temperature lithium batteries.

KW - Electrolyte

KW - Ionic liquid

KW - Lithium perchlorate

KW - Lithium-ion battery

KW - Organic ionic plastic crystal

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85207312762&origin=inward&txGid=1bb1aa1853f4805cdc13fb62bb53e3c6

UR - https://www.webofscience.com/wos/woscc/full-record/WOS:001338201900001

UR - https://www.mendeley.com/catalogue/2b497e9a-b9ca-3f51-b847-298145c5ed63/

U2 - 10.1007/s11581-024-05889-4

DO - 10.1007/s11581-024-05889-4

M3 - Article

VL - 30

SP - 8105

EP - 8115

JO - Ionics

JF - Ionics

SN - 0947-7047

IS - 12

ER -