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Slurry‐Fabricable Li + ‐Conductive Polymeric Binders for Practical All‐Solid‐State Lithium‐Ion Batteries Enabled by Solvate Ionic Liquids
Author(s) -
Oh Dae Yang,
Nam Young Jin,
Park Kern Ho,
Jung Sung Hoo,
Kim Kyu Tae,
Ha A. Reum,
Jung Yoon Seok
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201802927
Subject(s) - materials science , electrochemistry , lithium (medication) , ionic liquid , chemical engineering , electrolyte , sulfide , ionic bonding , triethylene glycol , inorganic chemistry , electrode , polymer chemistry , ion , organic chemistry , chemistry , metallurgy , medicine , engineering , endocrinology , catalysis
For mass production of all‐solid‐state lithium‐ion batteries (ASLBs) employing highly Li + conductive and mechanically sinterable sulfide solid electrolytes (SEs), the wet‐slurry process is imperative. Unfortunately, the poor chemical stability of sulfide SEs severely restrict available candidates for solvents and in turn polymeric binders. Moreover, the binders interrupt Li + ‐ionic contacts at interfaces, resulting in the below par electrochemical performance. In this work, a new scalable slurry fabrication protocol for sheet‐type ASLB electrodes made of Li + ‐conductive polymeric binders is reported. The use of intermediate‐polarity solvent (e.g., dibromomethane) for the slurry allows for accommodating Li 6 PS 5 Cl and solvate‐ionic‐liquid‐based polymeric binders (NBR‐Li(G3)TFSI, NBR: nitrile−butadiene rubber, G3: triethylene glycol dimethyl ether, LiTFSI: lithium bis(trifluoromethanesulfonyl)imide) together without suffering from undesirable side reactions or phase separation. The LiNi 0.6 Co 0.2 Mn 0.2 O 2 and Li 4 Ti 5 O 12 electrodes employing NBR‐Li(G3)TFSI show high capacities of 174 and 160 mA h g −1 at 30 °C, respectively, which are far superior to those using conventional NBR (144 and 76 mA h g −1 ). Moreover, high areal capacity of 7.4 mA h cm −2 is highlighted for the LiNi 0.7 Co 0.15 Mn 0.15 O 2 electrodes with ultrahigh mass loading of 45 mg cm −2 . The facilitated Li + ‐ionic contacts at interfaces paved by NBR‐Li(G3)TFSI are evidenced by the complementary analysis from electrochemical and 7 Li nuclear magnetic resonance measurements.