Freestanding silicon microparticle and self-healing polymer composite design for effective lithiation stress relaxation

Cited 1 time in webofscience Cited 0 time in scopus
  • Hit : 129
  • Download : 0
Self-healing features that mimic the biological mechanisms for self-repair have recently been applied to high-capacity but extreme volume expansion electrode materials such as silicon anodes to overcome the short cycle-life caused by electrical contact loss and active material pulverization. In this study, we adopt a freestanding composite design for effective relaxation of lithiation induced stresses and enhancement of electrochemical reliability. Silicon microparticles are homogenously dispersed and embedded within a self-healing polymer matrix that enables free volume expansion and contraction during lithiation and delithiation. The freestanding electrode, which does not require a separate current collector, demonstrated 91.8% capacity retention after 100 cycles at C/10 rate with an average specific capacity and gravimetric capacity, including current collector mass, of approximate to 2100 mA h g(-1) and approximate to 1050 mA h g(-1) respectively, which is a significant improvement compared to the conventional design of simple self-healing polymer coatings on silicon particle embedded current collectors. The fabricated freestanding silicon microparticle and self-healing polymer composite electrode demonstrated stable electrochemical performance after being completely cut, reattached, and cycled and retained at most 95% of its initial capacity. Overall, the proposed freestanding silicon microparticle and self-healing polymer composite design demonstrated excellent gravimetric capacity, cycle life, and self-healing capability without employing expensive and complex nanostructures.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2018-06
Language
English
Article Type
Article
Keywords

LITHIUM-ION BATTERIES; LONG CYCLE LIFE; NEGATIVE ELECTRODES; CONDUCTIVE POLYMER; ALLOY ANODES; HIGH-ENERGY; BINDER; PERFORMANCE; NANOPARTICLES; PARTICLES

Citation

JOURNAL OF MATERIALS CHEMISTRY A, v.6, no.24, pp.11353 - 11361

ISSN
2050-7488
DOI
10.1039/c7ta11269f
URI
http://hdl.handle.net/10203/244561
Appears in Collection
EEW-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 1 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0