公开(公告)号：US20220238911A1

公开(公告)日：2022-07-28

申请号：US17158751

申请日：2021-01-26

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Xingyi YANG ,  Michael P. BALOGH ,  Xingcheng XIAO ,  Joel G. TONER

IPC: H01M10/0562 ,  H01M4/62 ,  H01M4/505 ,  H01M4/525 ,  H01M4/38

Abstract: An electrolyte composition for electrochemical cells including a silicon-containing electrode is provided herein as well as electrochemical cells including the electrolyte composition. The electrolyte composition includes a lithium salt, fluoroethylene carbonate (FEC), a linear carbonate, vinylene carbonate, and a fluorosilane additive. The FEC and the linear carbonate are present in the electrolyte composition in a ratio of about 1:3 v/v to about 1:9 v/v.

公开(公告)号：US20220158167A1

公开(公告)日：2022-05-19

申请号：US17097483

申请日：2020-11-13

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Xingcheng XIAO ,  Hongliang WANG ,  Gayatri V. DADHEECH ,  Mei CAI

IPC: H01M4/133 ,  H01M4/1393 ,  H01M4/587 ,  H01M4/36 ,  H01M4/66 ,  H01M10/0525 ,  H01M4/62

Abstract: An electrode for an electrochemical cell is provided. The electrode includes a carbon membrane having a first face and an opposing second face, wherein at least a portion of the carbon membrane is modified to include an elevated number of nucleation sites for lithium relative to the carbon membrane when unmodified.

公开(公告)号：US20220102704A1

公开(公告)日：2022-03-31

申请号：US17039034

申请日：2020-09-30

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Mark W. VERBRUGGE ,  Xingcheng XIAO ,  Qinglin ZHANG ,  Xingyi YANG ,  Raghunathan K

IPC: H01M4/1395 ,  H01M4/134 ,  H01M4/04

Abstract: The present disclosure relates to a negative electrode material and methods of preparation and use relating thereto. The electrode material comprises a plurality of electroactive material particles, where each electroactive material particle includes an electroactive material core and an electronically conductive coating. The method includes contacting an electroactive material precursor including a plurality of electroactive material particles with a solution so as to form an electronically conductive coating on each of the electroactive material particles. The solution includes a solvent and one or more of copper fluoride (CuF2), titanium tetrafluoride (TiF3 or TiF4), iron fluoride (FeF3), nickel fluoride (NiF2), manganese fluoride (MnF2, MnF3, or MnF4), and vanadium fluoride (VF3, VF4, VF5). The electronically conductive coating includes a plurality of first regions and a plurality of second regions. The plurality of first regions include lithium fluoride. The plurality of second regions include one of copper, titanium, iron, nickel, manganese, and vanadium.

公开(公告)号：US20210135193A1

公开(公告)日：2021-05-06

申请号：US16668882

申请日：2019-10-30

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Lei WANG ,  Xingcheng XIAO ,  Wei LI ,  Mark W. VERBRUGGE ,  Michael P. BALOGH

IPC: H01M4/1395 ,  H01M4/38 ,  H01M4/04 ,  H01M4/66

Abstract: Methods of making negative electrode materials for an electrochemical cell that cycles lithium ions are provided. A surface of the electrode material formed of silicon, silicon-containing alloys, tin-containing alloys, or combinations thereof is treated with an oxidant at a first temperature of greater than or equal to about 100° C. to form a continuous intermediate layer comprising oxides. The method also includes pyrolyzing a carbon-containing precursor over the continuous intermediate layer at a second temperature of greater than or equal to about 600° C. to form a continuous carbon coating thereon. The intermediate layer oxides may be transformed to carbides. The continuous carbon coating comprises both graphitic carbon and amorphous carbon and may be a multilayered coating, where the inner layer predominantly includes amorphous carbon and the outer layer predominantly includes graphitic carbon.

公开(公告)号：US20210020912A1

公开(公告)日：2021-01-21

申请号：US16514633

申请日：2019-07-17

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Xingcheng XIAO ,  Jin LIU ,  Mei CAI ,  Meinan HE ,  Hongliang WANG

IPC: H01M4/1391 ,  H01M10/0525 ,  H01M10/0567 ,  H01M4/62 ,  H01M4/36 ,  H01M4/134 ,  H01M4/1395 ,  H01M4/04

Abstract: A negative electrode according to various aspects of the present disclosure includes a negative electroactive material and a layer. The negative electroactive material includes a lithium-aluminum alloy. The layer is disposed directly on at least a portion of the negative electroactive material and coupled to the negative electroactive material. The layer includes anodic aluminum oxide and has a plurality of pores. The present disclosure also provides an electrochemical cell including the negative electrode. In certain aspects, the negative electroactive material is electrically conductive and functions as a negative electrode current collector such that the electrochemical cell is free of a distinct negative electrode current collector component. In certain aspects, the layer is ionically conductive and electrically insulating and functions as a separator such that the electrochemical cell is free of a distinct separator component. In various aspects, the present disclosure also provides a method of making the negative electrode.

公开(公告)号：US20200220153A1

公开(公告)日：2020-07-09

申请号：US16239027

申请日：2019-01-03

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Xingcheng XIAO ,  Mark W. VERBRUGGE

IPC: H01M4/04 ,  H01M4/62 ,  H01M4/38 ,  H01M10/0525 ,  H01M4/134 ,  H01M4/1395

Abstract: Methods of forming a plurality of axial geometry carbon structures (e.g., carbon nanotubes or carbon fibers) in situ in an electrode of an electrochemical cell that cycles lithium ions are provided. Electroactive particles that undergo volumetric expansion are mixed with a polymer precursor and a plurality of catalytic nanoparticles comprising a metal selected from the group consisting of: iron, nickel, cobalt, alloys, and combinations thereof to form a substantially homogeneous slurry. The slurry is applied to a substrate and then heated in an environment having a temperature of ≤about 1000° C. and in certain aspects, ≤about 895° C. to pyrolyze the polymer precursor. The plurality of catalytic nanoparticles facilitates in situ precipitation of carbon to grow a plurality of axial geometry carbon structures. After the heating, the electrode includes an electrically conductive carbonaceous porous network comprising the plurality of electroactive particles and the plurality of axial geometry carbon structures.

公开(公告)号：US20190341615A1

公开(公告)日：2019-11-07

申请号：US16513303

申请日：2019-07-16

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Xingcheng XIAO ,  Xiaosong HUANG

IPC: H01M4/62 ,  H01M4/36 ,  H01M10/0525 ,  H01M4/38 ,  H01M4/1395 ,  H01M4/134 ,  H01M4/04

Abstract: An electroactive material for use in an electrochemical cell, like a lithium ion battery, is provided. The electroactive material comprises silicon or tin and undergoes substantial expansion during operation of a lithium ion battery. A polymeric ultrathin conformal coating is formed over a surface of the electroactive material. The coating is flexible and is capable of reversibly elongating by at least 250% from a contracted state to an expanded state in at least one direction to minimize or prevent fracturing of the negative electrode material during lithium ion cycling. The coating may be applied by vapor precursors reacting in atomic layer deposition (ALD) to form conformal ultrathin layers over the electroactive materials. Methods for making such materials and using such materials in electrochemical cells are likewise provided.