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Title: Electrolytes Polymerization‐Induced Cathode‐Electrolyte‐Interphase for High Voltage Lithium‐Ion Batteries

Journal Article · · Advanced Energy Materials
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  1. Department of Chemical and Biological Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China
  2. Chemical Sciences and Engineering Division Argonne National Laboratory Lemont IL 60439 USA
  3. Centre for Nanoscale Materials Argonne National Laboratory Lemont IL 60439 USA
  4. Materials Characterization and Preparation Facility The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong P. R. China
  5. Advanced Photon Source Argonne National Laboratory Lemont IL 60439 USA
  6. Materials Science and Nano‐Engineering Department Mohammed VI Polytechnic University Ben Guerir 434150 Morocco
  7. Chemistry Department Faculty of Science University of Jeddah Jeddah 21589 Saudi Arabia
  8. Chemical Sciences and Engineering Division Argonne National Laboratory Lemont IL 60439 USA, Department of Materials Science and Engineering Stanford University Stanford CA 94305 USA

Abstract Lithium‐ion batteries (LIBs) based on LiNi x Co y Mn 1‐x‐y O 2 (NCM) cathode materials have been widely commercialized, because of their high energy density, favorable rate performance, and relatively low cost. However, with increased Ni content to further increase their energy density, their cycling stability deteriorates dramatically and thus fails to meet the commercial application requirements. The artificial cathode‐electrolyte‐interphase (CEI) is a promising approach to solve this problem. Here, a robust CEI is fabricated through in situ polymerization of ethylene carbonate induced by aluminum isopropoxide (AIP). By adding 1 wt.% AIP in a commercial electrolyte, the capacity retention of LiNi 0.8 Co 0.1 Mn 0.1 O 2 ||Li cell at 1 C rate has been significantly increased from 80.8% to 97.8% with a highly reversible capacity of 176 mA h g −1 after 200 cycles. AIP can be also used as an additive during the slurry‐making process, enabling a reversible capacity of 170 mA h g −1 for LiCoO 2 after 200 cycles even at a high charge cut‐off voltage of 4.6 V. It is confirmed that the in situ formed CEI layer can prevent the cathodes from cracking and reduce the irreversible phase transformation.

Sponsoring Organization:
USDOE
OSTI ID:
1819782
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Vol. 11 Journal Issue: 39; ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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