Ternary Transition Metal Sulfide as High Real Energy Cathode for Lithium-Sulfur Pouch Cell Under Lean Electrolyte Conditions

Guo, Hao1,2; Hu, Jing2; Yuan, Huimin2; Wu, Ningning1; Li, Yingzhi2; Liu, Guiyu2; Qin, Ning2; Liao, Kemeng2; Li, Zhiqiang2; Luo, Wen2; Gu, Shuai2; Wan, Weihua1; Shi, Bin1; Xu, Xusheng1; Yang, Qinghua1; Shi, Jiayuan1; Lu, Zhouguang2

2021-12-01

10.1002/smtd.202101402

Small Methods   影响因子和分区

2366-9608

Fabrication of a highly porous sulfur host and using excess electrolyte is a common strategy to enhance sulfur utilization. However, flooded electrolyte limits the practical energy density of Li-S pouch cells. In this study, a novel Fe0.34Co0.33Ni0.33S2 (FCN) is proposed as host for sulfur to realize Ah-level Li-S full cells demonstrating excellent electrochemical performances under 2 mu L mg(-1) lean electrolyte conditions. Moreover, Kelvin probe force microscopy shows that the FCN surface contains positive charge with a potential of approximate to 70 mV, improving the binding of polysulfides through Lewis acid base interaction. In particular, the FCN@S possesses inherent electrochemical activity of simultaneous anionic and cationic redox for lithium storage in the voltage window of 1.8-2.1 V, which additionally contributes to the specific capacity. Due to the low carbon content (approximate to 10 wt%), the sulfur loading is as high as approximate to 6 mg cm(-2), approaching an outstanding energy density of 394.9 and 267.2 Wh kg(-1) at the current density of 1.5 and 4 mA cm(-2), respectively. Moreover, after 60 cycles at 1.5 mA cm(-2), the pouch cell still retains an energy of 300.2 Wh kg(-1). This study represents a milestone in the practical applications of high-energy Li-S batteries.

cathodes lean electrolytes lithium-sulfur sulfur vacancies ternary sulfide

SCI ; EI

英语

通讯

Guizhou Provincial Science and Technology Projects[QIANKEHE[2021]-317] ; Basic Research Project of the Science and Technology Innovation Commission of Shenzhen[JCYJ20200109141640095] ; Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials[ZDSYS20200421111401738] ; Guangdong-Hong Kong-Macao Joint Laboratory[2019B121205001] ; National Natural Science Foundation of China[21875097]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000731315600001

WILEY-V C H VERLAG GMBH

20215111370503

Cathodes ; Cells ; Cobalt compounds ; Cytology ; Iron compounds ; Lithium ; Nickel compounds ; Sulfur compounds ; Transition metals

Biological Materials and Tissue Engineering:461.2 ; Biology:461.9 ; Metallurgy and Metallography:531 ; Lithium and Alloys:542.4 ; Alkali Metals:549.1 ; Electric Batteries and Fuel Cells:702 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804

Web of Science

1.State Key Lab Adv Chem Power Sources, Zunyi 563003, Guizhou, Peoples R China
2.Southern Univ Sci & Technol, Guangdong Hong Kong Macao Joint Lab Photon Therma, Shenzhen Key Lab Interfacial Sci & Engn Mat, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

Guo, Hao,Hu, Jing,Yuan, Huimin,et al. Ternary Transition Metal Sulfide as High Real Energy Cathode for Lithium-Sulfur Pouch Cell Under Lean Electrolyte Conditions[J]. Small Methods,2021,6.

Guo, Hao.,Hu, Jing.,Yuan, Huimin.,Wu, Ningning.,Li, Yingzhi.,...&Lu, Zhouguang.(2021).Ternary Transition Metal Sulfide as High Real Energy Cathode for Lithium-Sulfur Pouch Cell Under Lean Electrolyte Conditions.Small Methods,6.

Guo, Hao,et al."Ternary Transition Metal Sulfide as High Real Energy Cathode for Lithium-Sulfur Pouch Cell Under Lean Electrolyte Conditions".Small Methods 6(2021).