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학술지 Electrolyte-free Graphite Electrode with Enhanced Interfacial Conduction Using Li+-conductive Binder for High-performance All-solid-state Batteries
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신동옥, 김형준, 정승원, 변승우, 최재철, 김민평, 김주영, 강석훈, 박영삼, 홍성유, 조맹효, 이영기, 조경재, 이용민
Energy Storage Materials, v.49, pp.481-492
22ZB1200, ICT 소재·부품·장비 자립기술 및 도전기술 개발, 황치선
Electrodes supported by conductive binders are expected to outperform ones with inert binders that potentially disturb electronic/ionic contacts at interfaces. Unlike electron-conductive binders, the employment of Li+-conductive binders has attracted relatively little attention due to the liquid electrolyte (LE)-impregnated electrode configuration in the conventional lithium-ion batteries (LIBs). Herein, an all-solid-state electrolyte-free electrode where electrolyte components are completely excluded is introduced as a new tactical electrode construction to evaluate the effectiveness of the Li+-conductive binder on enhancing the interfacial conduction, ultimately leading to high-performance all-solid-state batteries (ASSBs). Conductive lithium carboxymethyl cellulose (Li-CMC) is prepared through an optimized two-step cation-exchange reaction without physical degradation. The electrolyte-free graphite electrode employing Li-CMC as the binder shows strikingly improved areal and volumetric capacity of 1.46 mAh cm?닋2 and 490 mAh cm?닋3 at a high current rate (1.91 mA cm?닋2) and 60 °C which are far superior to those (1.07 mAh cm?닋2 and 356.7 mAh cm?닋3) using Na-CMC. Moreover, systematic monitoring of the lithiation dynamics inside the electrolyte-free electrode clarifies that the interfacial Li+ conduction is greatly promoted in the Li-CMC electrode. Complementary analysis from in-depth electrochemical measurements and multiscale simulations verifies that serious internal resistance from impeded interparticle diffusion by inert binders can be substantially mitigated using Li-CMC.
all-solid-state battery electrode, carboxymethyl cellulose, interfacial conduction, Li -conductive binder +
KSP 제안 키워드
Carboxymethyl cellulose, Current rate, Electrochemical measurements, High current, High performance, Interfacial conduction, Internal resistance, Interparticle diffusion, Ion batteries, Liquid electrolyte, Multiscale simulations
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저작자 표시 - 비영리 - 변경금지 (CC BY NC ND)