TY - JOUR
T1 - Dual-Functional Electrolyte Additives toward Long-Cycling Lithium-Ion Batteries
T2 - Ecofriendly Designed Carbonate Derivatives
AU - Han, Jung Gu
AU - Hwang, Eunbyul
AU - Kim, Yoseph
AU - Park, Sewon
AU - Kim, Koeun
AU - Roh, Deok Ho
AU - Gu, Minsu
AU - Lee, Sang Ho
AU - Kwon, Tae Hyuk
AU - Kim, Youngjo
AU - Choi, Nam Soon
AU - Kim, Byeong Su
N1 - Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020/5/27
Y1 - 2020/5/27
N2 - Long-term stability of the solid electrolyte interphase (SEI) and cathode-electrolyte interface (CEI) layers formed on anodes and cathodes is imperative to mitigate the interfacial degradation of electrodes and enhance the cycle life of lithium-ion batteries (LIBs). However, the SEI on the anode and CEI on the cathode are vulnerable to the reactive species of PF5 and HF produced by the decomposition and hydrolysis of the conventional LiPF6 electrolyte in a battery inevitably containing a trace amount of water. Here, we report a new class of cyclic carbonate-based electrolyte additives to preserve the integrity of SEI and CEI in LIBs. This new class of additives is designed and synthesized by an ecofriendly approach that involves fixing CO2 with functional epoxides bearing various reactive side chains. It was found that the cyclic carbonates of 3-(1-ethoxyethoxy)-1,2-propylene carbonate and 3-trimethoxysilylpropyloxy-1,2-propylene carbonate, possessing high capability for the stabilization of Lewis-acidic PF5, exhibit a capacity retention of 79.0% after 1000 cycles, which is superior to that of the pristine electrolyte of 54.7%. Moreover, TMSPC has HF-scavenging capability, which, along with PF5 stabilization, results in enhanced rate capability of commercial LiNi0.6Mn0.2Co0.2O2 (NCM622)/graphite full cells, posing a significant potential for high-energy-density LIBs with long cycle stability.
AB - Long-term stability of the solid electrolyte interphase (SEI) and cathode-electrolyte interface (CEI) layers formed on anodes and cathodes is imperative to mitigate the interfacial degradation of electrodes and enhance the cycle life of lithium-ion batteries (LIBs). However, the SEI on the anode and CEI on the cathode are vulnerable to the reactive species of PF5 and HF produced by the decomposition and hydrolysis of the conventional LiPF6 electrolyte in a battery inevitably containing a trace amount of water. Here, we report a new class of cyclic carbonate-based electrolyte additives to preserve the integrity of SEI and CEI in LIBs. This new class of additives is designed and synthesized by an ecofriendly approach that involves fixing CO2 with functional epoxides bearing various reactive side chains. It was found that the cyclic carbonates of 3-(1-ethoxyethoxy)-1,2-propylene carbonate and 3-trimethoxysilylpropyloxy-1,2-propylene carbonate, possessing high capability for the stabilization of Lewis-acidic PF5, exhibit a capacity retention of 79.0% after 1000 cycles, which is superior to that of the pristine electrolyte of 54.7%. Moreover, TMSPC has HF-scavenging capability, which, along with PF5 stabilization, results in enhanced rate capability of commercial LiNi0.6Mn0.2Co0.2O2 (NCM622)/graphite full cells, posing a significant potential for high-energy-density LIBs with long cycle stability.
KW - electrolyte additives
KW - HF scavenging
KW - LiPF-based electrolytes
KW - lithium-ion batteries
KW - PF stabilization
UR - http://www.scopus.com/inward/record.url?scp=85085531382&partnerID=8YFLogxK
U2 - 10.1021/acsami.0c04372
DO - 10.1021/acsami.0c04372
M3 - Article
C2 - 32368903
AN - SCOPUS:85085531382
SN - 1944-8244
VL - 12
SP - 24479
EP - 24487
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 21
ER -