TY - JOUR
T1 - New Lithium Salt Forms Interphases Suppressing Both Li Dendrite and Polysulfide Shuttling
AU - Xiao, Yinglin
AU - Han, Bing
AU - Zeng, Yi
AU - Chi, Shang-Sen
AU - Zeng, Xianzhe
AU - Zheng, Zijian
AU - Xu, Kang
AU - Deng, Yonghong
N1 - Funding Information:
Y.X. and B.H. contributed equally to this work. The authors gratefully acknowledge the funding support from R&D Projects in Key Areas of Guangdong Province (Grant No. JCYJ 2019B090908001).
Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/4/1
Y1 - 2020/4/1
N2 - Lithium–sulfur batteries (LSBs) are considered promising candidates for the next-generation energy-storage systems due to their high theoretical capacity and prevalent abundance of sulfur. Their reversible operation, however, encounters challenges from both the anode, where dendritic and dead Li-metal form, and the cathode, where polysulfides dissolve and become parasitic shuttles. Both issues arise from the imperfection of interphases between electrolyte and electrode. Herein, a new lithium salt based on an imide anion with fluorination and unsaturation in its structure is reported, whose interphasial chemistries resolve these issues simultaneously. Lithium 1, 1, 2, 2, 3, 3-hexafluoropropane-1, 3-disulfonimide (LiHFDF) forms highly fluorinated interphases at both anode and cathode surfaces, which effectively suppress formation of Li-dendrites and dissolution/shuttling of polysulfides, and significantly improves the electrochemical reversibility of LSBs. In a broader context, this new Li salt offers a new perspective for diversified beyond Li-ion chemistries that rely on a Li-metal anode and active cathode materials.
AB - Lithium–sulfur batteries (LSBs) are considered promising candidates for the next-generation energy-storage systems due to their high theoretical capacity and prevalent abundance of sulfur. Their reversible operation, however, encounters challenges from both the anode, where dendritic and dead Li-metal form, and the cathode, where polysulfides dissolve and become parasitic shuttles. Both issues arise from the imperfection of interphases between electrolyte and electrode. Herein, a new lithium salt based on an imide anion with fluorination and unsaturation in its structure is reported, whose interphasial chemistries resolve these issues simultaneously. Lithium 1, 1, 2, 2, 3, 3-hexafluoropropane-1, 3-disulfonimide (LiHFDF) forms highly fluorinated interphases at both anode and cathode surfaces, which effectively suppress formation of Li-dendrites and dissolution/shuttling of polysulfides, and significantly improves the electrochemical reversibility of LSBs. In a broader context, this new Li salt offers a new perspective for diversified beyond Li-ion chemistries that rely on a Li-metal anode and active cathode materials.
KW - electrolytes
KW - interphases
KW - lithium salts
KW - lithium–sulfur batteries
UR - http://www.scopus.com/inward/record.url?scp=85083531686&partnerID=8YFLogxK
U2 - 10.1002/aenm.201903937
DO - 10.1002/aenm.201903937
M3 - Journal article
SN - 1614-6832
VL - 10
SP - 1903937-n/a
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 14
M1 - 1903937
ER -