公开(公告)号：US20210066704A1

公开(公告)日：2021-03-04

申请号：US16559132

申请日：2019-09-03

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Mark W. VERBRUGGE ,  Xingcheng XIAO ,  Jiagang XU

IPC: H01M4/131 ,  H01M4/133 ,  H01M4/134 ,  H01M4/136 ,  H01M4/36 ,  H01M4/38 ,  H01M10/052

Abstract: The present disclosure provides methods of compensation for capacity loss resulting from cycle-induced lithium consumption in an electrochemical cell including at least one electrode. Such methods may include adding a lithiation additive to the at least one electrode so as to create a lithium source. The lithium source compensates for cycle-induced lithiation loss such that the electrochemical cell having the lithiation additive experiences total capacity losses of less than or equal to about 5% of an initial capacity prior to cycling of lithium. The lithiation additive includes a lithium silicate represented by the formula LiuHr, where Hr=Liy-uSiOz and where 0≤y≤3.75 and 0≤z≤2 and u is a useable portion of y, 0≤u≤y. The lithium source may include z/4 Li4SiO4 and LimSi, where 0≤m≤4.4.

公开(公告)号：US20210135230A1

公开(公告)日：2021-05-06

申请号：US16668904

申请日：2019-10-30

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Jiagang XU ,  Xingcheng XIAO ,  Robert D. SCHMIDT

IPC: H01M4/62 ,  H01M10/0585 ,  H01M10/0525 ,  H01M4/38 ,  H01M10/0562 ,  H01M4/36

Abstract: Methods of making a solid-state electrochemical cell that cycles lithium ions are provided that include applying a liquid metal composition comprising gallium to a first major surface of either a solid-state electrolyte or a solid electrode (e.g., lithium metal) in the presence of an oxidant and in an environment substantially free of water to reduce surface tension of the liquid metal composition so that it forms a continuous layer over the first major surface. The first major surface having the continuous layer of liquid metal composition is contacted with a second major surface to form a continuous interfacial layer between the solid-state electrolyte and the solid electrode. Solid-state electrochemical cells formed by such methods are also provided, where the metal composition comprising gallium is a liquid in a temperature range of greater than or equal to about 20° C. to less than or equal to about 30° C.

公开(公告)号：US20210083294A1

公开(公告)日：2021-03-18

申请号：US16573605

申请日：2019-09-17

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Xingcheng XIAO ,  Jin LIU ,  Jiagang XU ,  Mei CAI ,  Sherman H. ZENG

IPC: H01M4/62 ,  H01M4/04 ,  H01M10/0525 ,  H01M4/485 ,  H01M4/60 ,  H01M4/131 ,  H01M4/137 ,  H01M4/1391 ,  H01M4/1399

Abstract: An electrode including an electrode active material and a ceramic hydrofluoric acid (HF) scavenger is provided. The ceramic hydrofluoric acid (HF) scavenger includes M2SiO3, MAlO2, M2O—Al2O3—SiO2, or combinations thereof, where M is lithium (Li), sodium (Na), or combinations thereof. Methods of making the electrode are also provided.