公开(公告)号：US20190207208A1

公开(公告)日：2019-07-04

申请号：US16131884

申请日：2018-09-14

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Fang Dai ,  Shuru Chen ,  Meinan He ,  Mei Cai

IPC: H01M4/1395 ,  H01M4/58 ,  H01M4/04 ,  H01M4/36 ,  H01M4/38 ,  H01M4/134 ,  H01M4/66 ,  H01M10/0525 ,  H01M10/0585

CPC classification number: H01M4/1395 ,  H01M4/0419 ,  H01M4/0483 ,  H01M4/134 ,  H01M4/366 ,  H01M4/382 ,  H01M4/5815 ,  H01M4/661 ,  H01M10/0525 ,  H01M10/0585

Abstract: In a method of manufacturing an electrochemical cell, a porous or non-porous metal substrate may be provided. A precursor solution may be applied to a surface of the metal substrate. The precursor solution may comprise a chalcogen donor compound dissolved in a solvent. The precursor solution may be applied to the surface of the metal substrate such that the chalcogen donor compound reacts with the metal substrate and forms a conformal metal chalcogenide layer on the surface of the metal substrate. A conformal lithium metal layer may be formed on the surface of the metal substrate over the metal chalcogenide layer.

公开(公告)号：US20190207205A1

公开(公告)日：2019-07-04

申请号：US15862023

申请日：2018-01-04

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Keegan Adair ,  Fang Dai ,  Mei Cai

IPC: H01M4/134 ,  H01M4/131 ,  H01M4/1395 ,  H01M4/1391

Abstract: An electrochemical cell comprising a lithium metal negative electrode layer physically and chemically bonded to a surface of a negative electrode current collector via an intermediate metal chalcogenide layer. The intermediate metal chalcogenide layer may comprise a metal oxide, a metal sulfide, a metal selenide, or a combination thereof. The intermediate metal chalcogenide layer may be formed on the surface of the negative electrode current collector by exposing the surface to a chalcogen in gas phase. Then, the lithium metal negative electrode layer may be formed on the surface of the negative electrode current collector over the intermediate metal chalcogenide layer by contacting at least a portion of the metal chalcogenide layer with a source of lithium such that the lithium actively wets the metal chalcogenide layer and forms a conformal lithium metal layer on the surface of the negative electrode current collector over the metal chalcogenide layer.

公开(公告)号：US20190185685A1

公开(公告)日：2019-06-20

申请号：US15845402

申请日：2017-12-18

Applicant: GM Global Technology Operations LLC

Inventor： Fang Dai ,  Mahmoud Abd Elhamid ,  Anne M. Dailly ,  Mei Cai

IPC: C09D5/32 ,  C09D4/00 ,  C08J7/04 ,  B05D3/06

CPC classification number: C09D5/32 ,  B05D3/067 ,  C08J7/047 ,  C08J2377/06 ,  C09D4/00

Abstract: Systems and methods of providing a self-healing UV-protective polymer coating include a polymer matrix formed by initiating polymerization of a UV-absorbing-matrix precursor and a UV initiator and a self-healing portion disposed within the polymer matrix. The polymer matrix includes a plurality of active sites therein. The self-healing portion includes a self-healing precursor that is flowable and a self-healing initiator. The self-healing initiator is configured to polymerize the self-healing precursor using a cationic ring opening process.

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：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：US20180138513A1

公开(公告)日：2018-05-17

申请号：US15349341

申请日：2016-11-11

Applicant: GM Global Technology Operations LLC

Inventor： Fang Dai ,  Mahmoud H. Abd Elhamid ,  Anne M. Dailly ,  Mei Cai

IPC: H01M4/66 ,  C23C18/16 ,  C23C18/31 ,  H01M10/0525 ,  C25D3/38 ,  C25D3/12 ,  C25D17/00

CPC classification number: H01M4/661 ,  C23C18/1651 ,  C23C18/1653 ,  C23C18/54 ,  C25D3/12 ,  C25D3/38 ,  C25D3/40 ,  C25D5/44 ,  H01M4/667

Abstract: In certain aspects, electrolytic deposition and electroless displacement deposition methods are provided to form bimetallic structures that may be used as a bipolar current collector in a battery or a substrate for forming graphene sheets. In other aspects, bipolar current collectors for lithium-ion based electrochemical cells are provided. The bimetallic current collector may have an aluminum-containing surface and a continuous copper coating. In other aspects, a flexible substrate may be coated with one or more conductive materials, like nickel, copper, graphene, aluminum, alloys, and combinations thereof. The flexible substrate is folded to form a bipolar current collector. New stack assemblies for lithium-ion based batteries incorporating such bipolar current collectors are also provided that can have cells with a tab-free and/or weld-free design.

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.

公开(公告)号：US09627716B2

公开(公告)日：2017-04-18

申请号：US14617463

申请日：2015-02-09

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Li Yang ,  Mei Cai ,  Qiangfeng Xiao ,  Fang Dai ,  Mark W. Verbrugge

IPC: H01M6/16 ,  H01M10/0569 ,  H01M10/0567 ,  H01M4/134 ,  H01M4/38 ,  H01M10/052 ,  H01M4/02 ,  H01M10/0568

CPC classification number: H01M10/0569 ,  H01M4/134 ,  H01M4/386 ,  H01M10/052 ,  H01M10/0567 ,  H01M10/0568 ,  H01M2004/027 ,  H01M2300/0034 ,  H01M2300/0037

Abstract: An example electrolyte includes a solvent mixture, a lithium salt, a non-polymerizing solid electrolyte interface (SEI) precursor additive, and a solvent additive. The solvent mixture includes dimethyl carbonate (DMC) and fluoroethylene carbonate (FEC) present in a volume to volume ratio ranging from 20 to 1 to 1 to 20. The non-polymerizing SEI precursor additive is present in an amount ranging from greater than 0 wt % to about 10 wt % of a total wt % of the electrolyte, and the solvent additive is present in an amount ranging from greater than 0 wt % to about 10 wt % of the total wt % of the electrolyte.

公开(公告)号：US20160254567A1

公开(公告)日：2016-09-01

申请号：US15055306

申请日：2016-02-26

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC ,  THE REGENTS OF THE UNIVERSITY OF CALIFORNIA

Inventor： Mei Cai ,  Yunfeng Lu ,  Li Yang ,  Fang Dai ,  Jingmei Shen ,  Addis Fuhr ,  Li Shen

IPC: H01M10/0565 ,  H01M4/485 ,  H01M4/38 ,  H01M10/0525

CPC classification number: H01M10/0564 ,  H01M4/382 ,  H01M4/525 ,  H01M10/052 ,  H01M2220/20 ,  H01M2300/0065 ,  H01M2300/0085 ,  H01M2300/0088 ,  Y02E60/122 ,  Y02T10/7011

Abstract: An electrolyte structure includes a metal organic framework (MOF) material defining a plurality of pores. Anions are bound to respective metal atoms of the MOF material. The bound anions are located within each of the plurality of pores of the MOF material. Solvated cations are present within each of the plurality of pores.

Abstract translation: 电解质结构包括限定多个孔的金属有机骨架（MOF）材料。 阴离子与MOF材料的各自的金属原子结合。 结合的阴离子位于MOF材料的多个孔的每一个内。 溶解的阳离子存在于多个孔的每一个内。