TY - JOUR
T1 - An ultrathin, strong, flexible composite solid electrolyte for high-voltage lithium metal batteries
AU - Liu, Ke
AU - Wu, Maochun
AU - Jiang, Haoran
AU - Lin, Yanke
AU - Zhao, Tianshou
N1 - Funding Information:
The work described in this paper was supported by the grants from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. T23-601/17-R and No. 16209218).
Publisher Copyright:
© The Royal Society of Chemistry 2020.
PY - 2020/9/28
Y1 - 2020/9/28
N2 - The urgent need for safe, energy-dense electrochemical storage devices calls for high-voltage solid-state lithium metal batteries. However, state-of-the-art solid-state electrolytes are hindered by two critical issues: the narrow electrochemical window, which prevents the pairing of a lithium metal anode with a high-voltage cathode, and the large thickness which leads to a huge internal resistance and a significant sacrifice in energy density. To simultaneously address both the issues, in this work we develop a poly(acrylonitrile) (PAN)-LiClO4-boron nitrite nanoflake (BNNF) composite electrolyte modified with a BNNF layer (PBCEB). The PAN-LiClO4-BNNF composite can sustain an oxidation voltage of up to 4.5 Vvs.Li/Li+while the BNNF modifying layer prevents the PAN-LiClO4-BNNF from the reduction reaction with the lithium metal anode. In the meantime, thanks to the BNNFs, the PAN-LiClO4-BNNF possesses a strong tensile strength (16.0 MPa) and Young's modulus (563.7 MPa), which enables the PBCEB to be as thin as 13.5 μm (12.0 μm for the PAN-LiClO4-BNNF and 1.5 μm for the BNNF modifying layer). As a result, a Li/PBCEB/LiNi0.8Co0.1Mn0.1O2full battery delivers a high specific capacity of 173.6 mA h g−1at 0.2C and achieves a remarkable capacity retention of 68.1% after 350 cycles at 1C. This work provides an effective approach to develop high-performance composite solid electrolytes for high-voltage lithium metal batteries.
AB - The urgent need for safe, energy-dense electrochemical storage devices calls for high-voltage solid-state lithium metal batteries. However, state-of-the-art solid-state electrolytes are hindered by two critical issues: the narrow electrochemical window, which prevents the pairing of a lithium metal anode with a high-voltage cathode, and the large thickness which leads to a huge internal resistance and a significant sacrifice in energy density. To simultaneously address both the issues, in this work we develop a poly(acrylonitrile) (PAN)-LiClO4-boron nitrite nanoflake (BNNF) composite electrolyte modified with a BNNF layer (PBCEB). The PAN-LiClO4-BNNF composite can sustain an oxidation voltage of up to 4.5 Vvs.Li/Li+while the BNNF modifying layer prevents the PAN-LiClO4-BNNF from the reduction reaction with the lithium metal anode. In the meantime, thanks to the BNNFs, the PAN-LiClO4-BNNF possesses a strong tensile strength (16.0 MPa) and Young's modulus (563.7 MPa), which enables the PBCEB to be as thin as 13.5 μm (12.0 μm for the PAN-LiClO4-BNNF and 1.5 μm for the BNNF modifying layer). As a result, a Li/PBCEB/LiNi0.8Co0.1Mn0.1O2full battery delivers a high specific capacity of 173.6 mA h g−1at 0.2C and achieves a remarkable capacity retention of 68.1% after 350 cycles at 1C. This work provides an effective approach to develop high-performance composite solid electrolytes for high-voltage lithium metal batteries.
UR - http://www.scopus.com/inward/record.url?scp=85091454406&partnerID=8YFLogxK
U2 - 10.1039/d0ta05644h
DO - 10.1039/d0ta05644h
M3 - Journal article
AN - SCOPUS:85091454406
SN - 2050-7488
VL - 8
SP - 18802
EP - 18809
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 36
ER -
