公开(公告)号：US10388959B2

公开(公告)日：2019-08-20

申请号：US15623457

申请日：2017-06-15

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Yingnan Dong ,  Mei Cai ,  Li Yang ,  Xiaosong Huang

IPC: H01M4/62 ,  H01M4/04 ,  H01M4/36 ,  H01M4/38 ,  H01M10/0525 ,  H01M10/0569 ,  H01M10/0568 ,  H01M4/66

Abstract: In the formation of cathodes for lithium-sulfur battery cells, it is often desired to form the cathodes by resin-bonding particles of a sulfur-based cathode material as a porous cathode material layer on the surface(s) of a suitable metal current collector. It is found that the use of a copolymer of polyethylene oxide and polyvinyl alcohol, dissolved in water, provides a resin-particle slurry that is readily spreadable onto the current collector surface to form a uniform layer of porous cathode material particles. And upon evaporation of the water, the copolymer-bonded, sulfur-based particle coated cathodes function very well in assembled lithium-sulfur cells.

公开(公告)号：US10707530B2

公开(公告)日：2020-07-07

申请号：US15677389

申请日：2017-08-15

Applicant: GM Global Technology Operations LLC

Inventor： Li Yang ,  Mei Cai ,  Fang Dai ,  Yingnan Dong

IPC: H01M4/02 ,  H01M10/0568 ,  H01M10/0525 ,  H01M10/0569 ,  H01M10/052

Abstract: A highly-concentrated electrolyte system for an electrochemical cell is provided, along with methods of making the electrolyte system. The electrolyte system includes a bound moiety having an ionization potential greater than an electron affinity and comprising one or more salts selected from the group consisting of: lithium bis(fluorosulfonyl)imide, sodium bis(fluorosulfonyl)imide, potassium bis(fluorosulfonyl)imide, and combinations thereof bound to a solvent comprising one or more solvents selected from the group consisting of: dimethyl carbonate, dimethyl dicarbonate, and combinations thereof. The salts have a concentration in the electrolyte system of greater than or equal to about 4 M. A molar ratio of the salts to the dimethyl carbonate is about 0.5. A molar ratio of the salts to the dimethyl dicarbonate is about 1. The salts binds to the dimethyl carbonate and/or dimethyl dicarbonate causing the electrolyte system to be substantially free of unbound dimethyl carbonate, unbound dimethyl dicarbonate, and unbound bis(fluorosulfonyl)imide.

公开(公告)号：US20190058219A1

公开(公告)日：2019-02-21

申请号：US15677389

申请日：2017-08-15

Applicant: GM Global Technology Operations LLC

Inventor： Li Yang ,  Mei Cai ,  Fang Dai ,  Yingnan Dong

IPC: H01M10/0568 ,  H01M10/0525 ,  H01M10/0569

CPC classification number: H01M10/0568 ,  H01M10/052 ,  H01M10/0525 ,  H01M10/0569 ,  H01M2300/0028

Abstract: A highly-concentrated electrolyte system for an electrochemical cell is provided, along with methods of making the electrolyte system. The electrolyte system includes a bound moiety having an ionization potential greater than an electron affinity and comprising one or more salts selected from the group consisting of: lithium bis(fluorosulfonyl)imide, sodium bis(fluorosulfonyl)imide, potassium bis(fluorosulfonyl)imide, and combinations thereof bound to a solvent comprising one or more solvents selected from the group consisting of: dimethyl carbonate, dimethyl dicarbonate, and combinations thereof. The salts have a concentration in the electrolyte system of greater than or equal to about 4M. A molar ratio of the salts to the dimethyl carbonate is about 0.5. A molar ratio of the salts to the dimethyl dicarbonate is about 1. The salts binds to the dimethyl carbonate and/or dimethyl dicarbonate causing the electrolyte system to be substantially free of unbound dimethyl carbonate, unbound dimethyl dicarbonate, and unbound bis(fluorosulfonyl)imide.

公开(公告)号：US20180366730A1

公开(公告)日：2018-12-20

申请号：US15623457

申请日：2017-06-15

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Yingnan Dong ,  Mei Cai ,  Li Yang ,  Xiaohong Huang

IPC: H01M4/62 ,  H01M4/04 ,  H01M4/36 ,  H01M4/38 ,  H01M10/0525 ,  H01M10/0569 ,  H01M10/0568 ,  H01M4/66

CPC classification number: H01M4/622 ,  H01M4/0404 ,  H01M4/1397 ,  H01M4/364 ,  H01M4/382 ,  H01M4/625 ,  H01M4/661 ,  H01M10/0525 ,  H01M10/0568 ,  H01M10/0569 ,  H01M2300/0037

Abstract: In the formation of cathodes for lithium-sulfur battery cells, it is often desired to form the cathodes by resin-bonding particles of a sulfur-based cathode material as a porous cathode material layer on the surface(s) of a suitable metal current collector. It is found that the use of a copolymer of polyethylene oxide and polyvinyl alcohol, dissolved in water, provides a resin-particle slurry that is readily spreadable onto the current collector surface to form a uniform layer of porous cathode material particles. And upon evaporation of the water, the copolymer-bonded, sulfur-based particle coated cathodes function very well in assembled lithium-sulfur cells.