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PEDOT:PSS @Molecular Sieve as Dual‐Functional Additive to Enhance Electrochemical Performance and Stability of Ni‐Rich NMC Lithium‐Ion Batteries
Author(s) -
Xue Xiaoyin,
Zhang Hao,
Yuan Shuai,
Shi Liyi,
Zhao Yin,
Wang Zhuyi,
Chen Haijun,
Zhu Jiefang
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000339
Subject(s) - pedot:pss , cathode , materials science , x ray photoelectron spectroscopy , electrode , chemical engineering , lithium (medication) , electrochemistry , electrolyte , dielectric spectroscopy , analytical chemistry (journal) , chemistry , polymer , composite material , organic chemistry , medicine , engineering , endocrinology
Molecular sieves (MSs) coated with conductive polymer (PEDOT:PSS) are used as water scavengers to modify the nickel‐rich LiNi 1– x – y Co x Mn y O 2 (NMC)‐layered cathode. This strategy proactively captures residual water in the battery system without affecting the transport performance of electrons and Li + ions. The moisture content and nuclear magnetic resonance (NMR) tests show that MSs after coating still maintain good water absorption characteristics and inhibit the decomposition of the electrolyte. The conductivity of the PEDOT:PSS@MS‐NMC electrode is 1.08 × 10 −4 S cm −1 , which is improved by 63.9%, compared with the MS‐NMC electrode. Through X‐ray photoelectron spectroscopy, transmission electron microscopy, and scanning electron microscopy measurements, it is also shown that the surface structure stability and particle integrity for PEDOT:PSS@MS‐NMC electrode is well retained. After 500 cycles, the capacity retention of the composite cathode is 71.3%, which is higher than that of the NMC (38.3%) and MS‐NMC cathode (62.4%). This is a novel and effective strategy to suppress side reactions at the electrode interface and improve electrode stability, capacity retention, and cycle performance of the Ni‐rich NMC cathode.