TY - JOUR
T1 - The improvement effect of LiF on stability of Li anode in PVDF-HFP gel polymer electrolyte
AU - Yang, Lei
AU - Guo, Xingming
AU - Yao, Ying
AU - Zhang, Cunzhong
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2020/9/30
Y1 - 2020/9/30
N2 - The porous composite polymer membranes, based on poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) polymer matrix and lithium fluoride (LiF) inorganic additive, were prepared by phase inversion method and gel polymer electrolytes (GPEs) were obtained by immersing membranes into liquid electrolyte. GPEs containing LiF additive exhibited a high ionic conductivity of 1.10 10-3 S cm-1 and a high lithium ion transference number of 0.65 because of the lower crystallinity degree of GPEs. Moreover, we disclosed distinct merits including enhanced migration of Li+ and suppressed Li-ion concentration gradient in GPE near the surface of Li electrode. These merits ameliorated electrochemical performance of Li metal anode by retarding Li dendrite. LiF-GPEs effectively improved the cyclability and rate performance of symmetrical Li cells in a wide current densities rage. Pairing with LiFePO4 cathode, full cells containing LiF-GPEs showed excellent rate performance and cycling stability. This work effectively demonstrates that LiF-GPEs could suppress lithium dendrite by boosting electrochemical characters of mass transfer, and kinetic parameters.
AB - The porous composite polymer membranes, based on poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) polymer matrix and lithium fluoride (LiF) inorganic additive, were prepared by phase inversion method and gel polymer electrolytes (GPEs) were obtained by immersing membranes into liquid electrolyte. GPEs containing LiF additive exhibited a high ionic conductivity of 1.10 10-3 S cm-1 and a high lithium ion transference number of 0.65 because of the lower crystallinity degree of GPEs. Moreover, we disclosed distinct merits including enhanced migration of Li+ and suppressed Li-ion concentration gradient in GPE near the surface of Li electrode. These merits ameliorated electrochemical performance of Li metal anode by retarding Li dendrite. LiF-GPEs effectively improved the cyclability and rate performance of symmetrical Li cells in a wide current densities rage. Pairing with LiFePO4 cathode, full cells containing LiF-GPEs showed excellent rate performance and cycling stability. This work effectively demonstrates that LiF-GPEs could suppress lithium dendrite by boosting electrochemical characters of mass transfer, and kinetic parameters.
UR - http://www.scopus.com/inward/record.url?scp=85092767172&partnerID=8YFLogxK
U2 - 10.1088/1755-1315/565/1/012062
DO - 10.1088/1755-1315/565/1/012062
M3 - Conference article
AN - SCOPUS:85092767172
SN - 1755-1307
VL - 565
JO - IOP Conference Series: Earth and Environmental Science
JF - IOP Conference Series: Earth and Environmental Science
IS - 1
M1 - 012062
T2 - 2020 6th International Conference on Energy Science and Chemical Engineering, ICESCE 2020
Y2 - 17 July 2020 through 19 July 2020
ER -