Title: Porous silicon oxide (SiO) anode enabled by a conductive polymer binder and performance enhancement by stabilized lithium metal power (SLMP)

Abstract

The invention demonstrates that only 2% functional conductive polymer binder without any conductive additives was successfully used with a micron-size silicon monoxide (SiO) anode material, demonstrating stable and high gravimetric capacity (>1000 mAh/g) for .about.500 cycles and more than 90% capacity retention. Prelithiation of this anode using stabilized lithium metal powder (SLMP.RTM.) improves the first cycle Coulombic efficiency of a SiO/NMC full cell from .about.48% to .about.90%. This combination enables good capacity retention of more than 80% after 100 cycles at C/3 in a lithium-ion full cell. We also demonstrate the important connection between porosity and the loading of silicon electrodes. By employing a highly porous silicon electrode, a high areal capacity (3.3 mAh/cm.sup.2) is obtained. This method works well to achieve high loading of other high-capacity alloy anodes, the state-of-art graphite anode, as well as a high loading of positive electrodes for LIBs.

Inventors:

Liu, Gao; Zhao, Hui

Issue Date:

2019-07-02

Research Org.:

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1568556

Patent Number(s):

10,340,508

Application Number:

14/741,383

Assignee:

The Regents of the University of California (Oakland, CA)

DOE Contract Number:  

AC02-05CH11231

Resource Type:

Patent

Resource Relation:

Patent File Date: 06/16/2015

Country of Publication:

United States

Language:

English