Alloying Germanium Nanowire Anodes Dramatically Outperform Graphite Anodes in Full-Cell Chemistries over a Wide Temperature Range.

ABSTRACT: The electrochemical performance of Ge, an alloying anode in the form of directly grown nanowires (NWs), in Li-ion full cells (vs LiCoO₂) was analyzed over a wide temperature range (-40 to 40 °C). LiCoO₂||Ge cells in a standard electrolyte exhibited specific capacities 30× and 50× those of LiCoO₂||C cells at -20 and -40 °C, respectively. We further show that propylene carbonate addition further improved the low-temperature performance of LiCoO₂||Ge cells, achieving a specific capacity of 1091 mA h g^-1 after 400 cycles when charged/discharged at -20 °C. At 40 °C, an additive mixture of ethyl methyl carbonate and lithium bis(oxalato)borate stabilized the capacity fade from 0.22 to 0.07% cycle^-1. Similar electrolyte additives in

SUBMITTER: Collins GA 

PROVIDER: S-EPMC8288911 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature