Effects of the Formulations of Silicon-Based Composite Anodes on their Mechanical, Storage, and Electrochemical Properties.
ChemSusChem
; 10(20): 4080-4089, 2017 10 23.
Article
in En
| MEDLINE
| ID: mdl-28834635
ABSTRACT
In this work, the effects of the formulation of silicon-based composite anodes on their mechanical, storage, and electrochemical properties were investigated. The electrode formulation was changed through the use of hydrogenated or modified (through the covalent attachment of a binding additive such as polyacrylic acid) silicon and acetylene black or graphene sheets as conducting additives. A composite anode with a covalently grafted binder had the highest elongation without breakages and strong adhesion to the current collector. These mechanical properties depend significantly on the conductive carbon additive used and the use of graphene sheets instead of acetylene black can improve elongation and adhesion significantly. After 180â
days of storage under ambient conditions, the electronic conductivity and discharge capacity of the modified silicon electrode showed much smaller decreases in these properties than those of the hydrogenated silicon composite electrode, indicating that the modification can result in passivation and a constant composition of the active material. Moreover, the composite Si anode has a high packing density. Consequently, thin-film electrodes with very high material loadings can be prepared without decreased electrochemical performance.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Electric Power Supplies
/
Silicon
/
Mechanical Phenomena
Language:
En
Journal:
ChemSusChem
Journal subject:
QUIMICA
/
TOXICOLOGIA
Year:
2017
Type:
Article
Affiliation country:
Canada