Journal
MATERIALS TODAY
Volume 29, Issue -, Pages 26-36Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mattod.2019.02.004
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2018R1A2A1A05079249]
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [NRF-2017M3D1A1039553]
- World Premier Materials grant - Korea government Ministry of Trade, Industry and Energy
- [IBS-R006-A2]
- National Research Foundation of Korea [2018R1A2A1A05079249] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Recent discovery of high-concentration electrolyte systems has opened a new avenue toward the high-voltage, safe, and low-cost aqueous rechargeable batteries. However, the need for generally high-cost organic solutes in the high-concentration electrolyte has become another major obstacle. Herein, we revisited all the commonly used low-cost solutes for high-concentration system and discovered that the use of NaClO4 solute effectively results in a wide electrochemical stability window by suppressing water decomposition and induces stable solid-electrolyte interphase (SEI) layer formation without involving the reduction of salt anions. The SEI layer, composed of Na2CO3 and Na-O compounds including NaOH, guarantees the excellent electrochemical storage stability of the full-cell composed of Na4Fe3(PO4)(2)(P2O7) cathode and NaTi2(PO4)(3 )anode for the extended period of time. This new class of electrolyte systems provides remarkable cycle stability and a coulombic efficiency of similar to 99% at 1C for over 200 cycles, which outperforms the state-of-the-art super-concentrated systems based on NaCF3SO3.
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