公开(公告)号：US10446884B2

公开(公告)日：2019-10-15

申请号：US15295600

申请日：2016-10-17

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Li Yang ,  Mei Cai ,  Martin S. Ruthkosky ,  Fang Dai

IPC: H01M10/48 ,  H01M10/0525

Abstract: An example of a three-electrode test cell includes a negative electrode, a positive electrode having an aperture defined therein, a reference electrode, and a first microporous polymer separator soaked in an electrolyte. The reference electrode is disposed within the aperture of the positive electrode and physically separated from the positive electrode. The first microporous polymer separator is disposed between the negative electrode and the positive electrode.

公开(公告)号：US10424784B2

公开(公告)日：2019-09-24

申请号：US15337780

申请日：2016-10-28

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Li Yang ,  Mei Cai ,  Meng Jiang ,  Martin S. Ruthkosky

IPC: H01M4/36 ,  H01M4/38 ,  H01M4/62 ,  H01M10/0569 ,  H01M10/0525

Abstract: An example of a negative electrode includes silicon nanoparticles having a carbon coating thereon. The carbon coating has an oxygen-free structure including pentagon rings. The negative electrode with the silicon nanoparticles having the carbon coating thereon may be incorporated into a lithium-based battery. In an example of a method, silicon nanoparticles are provided. A carbon precursor is applied on the silicon nanoparticles. The carbon precursor is an oxygen-free, fluorene-based polymer. Then the silicon nanoparticles are heated in an inert gas atmosphere to form the carbon coating on the silicon nanoparticles. The carbon coating formed on the silicon nanoparticles has an oxygen-free structure including pentagon rings.

公开(公告)号：US20190237758A1

公开(公告)日：2019-08-01

申请号：US15886396

申请日：2018-02-01

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Gayatri V. Dadheech ,  Li Yang ,  Mark W. Verbrugge

IPC: H01M4/38 ,  H01M10/0525 ,  H01M4/66 ,  H01M4/04

CPC classification number: H01M4/382 ,  H01M4/0419 ,  H01M4/661 ,  H01M10/0525 ,  H01M2004/027

Abstract: Methods of forming a lithium-based negative electrode assembly are provided. A surface of a metal current collector is treated with a reducing plasma gas so that after the treating, a treated surface of the metal current collector is formed that has a contact angle of less than or equal to about 10° and has less than or equal to about 5% metal oxides. The metal current collector may include a metal, such as copper, nickel, and iron. A lithium metal is applied to the treated surface of the metal current collector in an environment substantially free from oxidizing species. Lithium metal flows over and adheres to the treated surface to form a layer of lithium. The layer of lithium may be a thin layer having a thickness of ≥about 1 μm to ≤about 75 μm thus forming the lithium metal negative electrode assembly.

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.

公开(公告)号：US20180151887A1

公开(公告)日：2018-05-31

申请号：US15363445

申请日：2016-11-29

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Li Yang ,  Mei Cai ,  Fang Dai ,  Gayatri V. Dadheech

IPC: H01M4/62 ,  H01M4/04 ,  H01M4/38 ,  H01M10/42 ,  H01M10/052 ,  H01M2/16 ,  H01M4/36

CPC classification number: H01M4/628 ,  H01M2/1653 ,  H01M2/1673 ,  H01M4/0404 ,  H01M4/366 ,  H01M4/382 ,  H01M10/052 ,  H01M10/0565 ,  H01M10/4235 ,  H01M2004/027 ,  H01M2300/0085

Abstract: An example of a negative electrode includes a lithium metal active material and a coating disposed on the lithium metal active material. The coating consists of one of: (i) a polymeric ionic liquid; or (ii) a VEC polymer formed from vinyl ethylene carbonate; or (iii) a homo-polymer formed from ethylene glycol methyl ether methacrylate, triethylene glycol methyl ether methacrylate, or polyethylene glycol methyl ether methacrylate; or (iv) a combination of any two or more of (i), (ii), and (iii).

公开(公告)号：US09979008B2

公开(公告)日：2018-05-22

申请号：US14932361

申请日：2015-11-04

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Fang Dai ,  Mei Cai ,  Qiangfeng Xiao ,  Li Yang

IPC: C25D7/00 ,  C25D9/02 ,  H01M4/04 ,  H01M10/0567 ,  H01M10/052 ,  H01M4/139 ,  H01M10/04 ,  H01M4/36 ,  H01M4/38

CPC classification number: H01M4/0452 ,  C25D9/02 ,  H01M4/0447 ,  H01M4/139 ,  H01M4/362 ,  H01M4/382 ,  H01M10/049 ,  H01M10/052 ,  H01M10/0567

Abstract: In an example of the method for making a solid electrolyte interface (SEI) layer on a surface of an electrode, the electrode is exposed to an electrolyte solution in an electrochemical cell. The electrolyte solution includes either i) an organo-polysulfide additive having a formula RSnR′ (n≥2), wherein R and R′ are independently selected from a methyl group, an unsaturated chain, a 3-(Trimethoxysilyl)-1-propyl group, or a 4-nitrophenyl group, or ii) a fluorinated organo-polysulfide additive having a formula RSnR′ (n≥2), wherein R and R′ can be the same or different, and wherein R and R′ each have a general formula of CxHyF(2x−y+1), where x is at least 1 and y ranges from 0 to 2x. A voltage or a load is applied to the electrochemical cell.

公开(公告)号：US20180123124A1

公开(公告)日：2018-05-03

申请号：US15337780

申请日：2016-10-28

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Li Yang ,  Mei Cai ,  Meng Jiang ,  Martin S. Ruthkosky

IPC: H01M4/36 ,  H01M10/0525 ,  H01M10/0569 ,  H01M4/38 ,  H01M4/62

Abstract: An example of a negative electrode includes silicon nanoparticles having a carbon coating thereon. The carbon coating has an oxygen-free structure including pentagon rings. The negative electrode with the silicon nanoparticles having the carbon coating thereon may be incorporated into a lithium-based battery. In an example of a method, silicon nanoparticles are provided. A carbon precursor is applied on the silicon nanoparticles. The carbon precursor is an oxygen-free, fluorene-based polymer. Then the silicon nanoparticles are heated in an inert gas atmosphere to form the carbon coating on the silicon nanoparticles. The carbon coating formed on the silicon nanoparticles has an oxygen-free structure including pentagon rings.

公开(公告)号：US20170271726A1

公开(公告)日：2017-09-21

申请号：US15073301

申请日：2016-03-17

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Jingmei Shen ,  Mei Cai ,  Zhongying Shi ,  Tao Wang ,  Wayne Z. Ptasinski ,  Simon T. Dunmore ,  William J. Wallace ,  Helen X. Qin ,  Li Yang

IPC: H01M10/637 ,  H01M10/613 ,  H01M10/625 ,  H01M10/658 ,  H01M10/653 ,  H01M10/6556 ,  H01M10/6568 ,  H01M2/10 ,  H01M10/647

CPC classification number: H01M10/637 ,  H01M2/1083 ,  H01M2/1094 ,  H01M10/613 ,  H01M10/625 ,  H01M10/647 ,  H01M10/653 ,  H01M10/6554 ,  H01M10/6556 ,  H01M10/6567 ,  H01M10/6568 ,  H01M10/658 ,  H01M10/659 ,  H01M2220/20

Abstract: Examples of battery pack systems that include polymers are a cooling system, a thermal management system, and a liquid leakage control system. The cooling system and the thermal management systems may include an upper critical solution temperature polymer or a lower critical solution temperature polymer. The liquid leakage control system includes a superabsorbent polymer.

公开(公告)号：US20170271678A1

公开(公告)日：2017-09-21

申请号：US15070677

申请日：2016-03-15

Applicant: GM Global Technology Operations LLC

Inventor： Li Yang ,  Mei Cai ,  Niccolo Jimenez ,  Fang Dai ,  Qiangfeng Xiao

IPC: H01M4/62 ,  H01M4/38 ,  H01M4/134 ,  H01M10/0525 ,  H01M4/66

CPC classification number: H01M4/622 ,  H01M4/134 ,  H01M4/386 ,  H01M4/625 ,  H01M4/661 ,  H01M4/662 ,  H01M10/0525

Abstract: A negative electrode for an electrochemical cell (e.g., a lithium ion battery) is provided. The electrode has an active material that undergoes volumetric expansion during lithiation and delithiation, e.g., silicon-containing materials. The electrode has a current collector with an electrically conductive flexible surface primer coating disposed thereon. The primer coating comprises a polymer with a glass transition temperature of ≦85° C. and an electrically conductive particle. When assembled, the flexible surface primer coating serves to reduce strain at the interface between the active material and current collector. The primer coating and the electroactive material remain intact on the surface of the current collector after at least one cycle of lithium ion insertion and deinsertion in the electrode, thus minimizing or preventing charge capacity loss in the electrochemical cell. Methods for making such materials and using such coatings to minimize charge capacity fade in lithium ion electrochemical cells are likewise provided.