公开(公告)号：US20230006254A1

公开(公告)日：2023-01-05

申请号：US17780489

申请日：2020-11-30

Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH

Inventor： Dan Thien NGUYEN ,  Zhi Wei SEH

IPC: H01M10/0568 ,  H01M10/0569 ,  H01M4/46 ,  H01M10/054 ,  H01M50/109

Abstract: The present disclosure relates to an electrolyte comprising at least one magnesium salt having a polyatomic anion, an aluminium halide salt and a solvent comprising at least one ether group. The electrolyte described herein does not comprise magnesium chloride. The electrolyte described herein may be used in magnesium ion electrochemical cells.

公开(公告)号：US20220325092A1

公开(公告)日：2022-10-13

申请号：US17638788

申请日：2020-08-26

Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH

Inventor： Alex Yong Sheng ENG ,  Zhi Wei SEH

IPC: C08L33/20 ,  C08F8/34 ,  H01M10/0568

Abstract: There is provided a composite comprising a) a short chain sulfur; and b) a carbon-supported conductive polymer such as polyacrylonitrile, wherein sulfur atoms of said short chain sulfur are covalently linked to the conductive polymer of said carbon-supported conductive polymer via a C—S bond. A method of preparing said composite comprising polymerizing a plurality of monomers in the presence of a carbon scaffold, mixing elemental sulfur and heating the mixture to obtain said composite is also disclosed. An electrochemical cell comprising said composite as cathode, a sodium anode and a liquid electrolyte such as sodium trifluoromethanesulfonate dissolved in a mixture of solvents is disclosed.

公开(公告)号：US20220416301A1

公开(公告)日：2022-12-29

申请号：US17780021

申请日：2020-12-04

Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH

Inventor： Dan Thien NGUYEN ,  Zhi Wei SEH

IPC: H01M10/0567 ,  H01M10/054 ,  H01M10/0569

Abstract: There is a liquid electrolyte composition comprising: i) a magnesium salt comprising a trifluoromethane sulfonate anion; ii) an additive comprising an organic halide salt, an inorganic halide salt or a mixture thereof; and iii) a solvent comprising one or more ethers, wherein the organic halide salt comprises a halide anion and a cation selected from an optionally substituted quaternary ammonium or a three to nine membered N-heterocyclic cation, and the cation comprises at least one protonated nitrogen capable of dissociating the trifluoromethane sulfonate anion from the magnesium salt, and wherein the total concentration of cations of the inorganic halide salt and magnesium ions of the magnesium salt divided by the concentration of anions of the inorganic halide salt is greater than 1 in the electrolyte composition. There is further provided an electrochemical cell comprising a) a positive electrode; b) a magnesium negative electrode; and c) the electrolyte composition as described herein, wherein the positive electrode and the magnesium negative electrode are in fluid communication with the electrolyte.

公开(公告)号：US20230050689A1

公开(公告)日：2023-02-16

申请号：US17779547

申请日：2020-11-27

Applicant: Agency for Science, Technology and Research

Inventor： Yong WANG ,  Yong Sheng Alex ENG ,  Zhi Wei SEH

IPC: H01M4/583 ,  H01M4/04 ,  H01M4/36 ,  H01M4/62 ,  H01M4/66 ,  H01M4/38 ,  H01M10/39

Abstract: There is provided a method of synthesizing a porous carbon-sulfur composite comprising the step of carbonizing a carbon material having a metal-organic framework (MOF) at a temperature of 800-1000° C. to produce a porous carbon, mixing and heating the porous carbon with sulfur to infuse the sulfur (melt diffusion) into the pores of the porous carbon and removing excess sulfur not infused into the pores or present on the surface of the porous carbon. There is also provided a cathode comprising the porous carbon-sulfur composite and a method of preparing the cathode by mixing with conductive carbon and a polymer binder. The cathode finds use in an electrochemical cell comprising a sodium or lithium anode.

公开(公告)号：US20220367923A1

公开(公告)日：2022-11-17

申请号：US17773568

申请日：2020-10-26

Applicant: Agency for Science, Technology and Research

Inventor： Vipin KUMAR ,  Zhi Wei SEH

IPC: H01M10/39 ,  H01M4/38

Abstract: The present disclosure relates to an electrolyte comprising: a) a sodium salt; b) an additive comprising at least one additional metallic/metalloid cation having a standard reduction potential which is at least 2.5V more positive than that of sodium cation; wherein said sodium salt and said additive are dispersed in a solvent comprising at least one alkyl carbonate, and wherein the concentration of said metallic/metalloid cation in the electrolyte is 15 mM to 250 mM. The present disclosure also relates to a sodium-sulfur cell comprising a sodium anode, a microporous sulfur cathode, and the electrolyte as described herein. The present disclosure further provides a method of improving cycling life of a sodium-sulfur cell, wherein the sodium-sulfur cell comprising a sodium anode, a sulfur cathode, and an electrolyte containing a sodium salt dispersed in an alkyl carbonate solvent.