Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 16, Pages 19023-19032Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c02445
Keywords
Si-based electrode; lithium-ion battery (LIB); bilayer; C coating; C nanoparticle reinforced polypyrrole; polymer matrix composite
Funding
- Research Foundation for Distinguished Scholars of Qingdao Agricultural University [665-1119008]
- Hong Kong Research Grants Council [25301617]
- Hong Kong Polytechnic University [1-ZE6G]
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Si-based electrodes offer exceptionally high capacity and energy density for lithium-ion batteries (LIBs),but suffer from poor structural stability and electrical conductivity that hamper their practical applications. To tackle these obstacles, we design a C/polymer bilayer coating deposited on Si-SiOx microparticles. The inner C coating is used to improve electrical conductivity. The outer C-nanoparticle-reinforced polypyrrole (CNP-PPy) is a polymer matrix composite that can minimize the volumetric expansion of Si-SiOx and enhance its structural stability during battery operation. Electrodes made of such robust Si-SiOx@C/CNP-PPy microparticles exhibit excellent cycling performance: 83% capacity retention (794 mAh g(-1)) at a 2 C rate after more than 900 cycles for a coin-type half cell, and 80% capacity retention (with initial energy density of 308 Wh kg(-1)) after over 1100 cycles for a pouch-type full cell. By comparing the samples with different coatings, an in-depth understanding of the performance enhancement is achieved, i.e., the C/CNP-PPy with cross-link bondings formed in the bilayer coating plays a key role for the improved structural stability. Moreover, a full battery using the Si-SiOx@C/CNP-PPy electrode successfully drives a car model, demonstrating a bright application prospect of the C/polymer bilayer coating strategy to make future commercial LIBs with high stability and energy density.
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