Highly Energy-Dissipative, Fast Self-Healing Binder for Stable Si Anode in Lithium-Ion Batteries
Artikel i vetenskaplig tidskrift, 2020

A double-wrapped binder has been rationally designed with high Young's modulus polyacrylic acid (PAA) inside and low Young's modulus bifunctional polyurethane (BFPU) outside to address the large inner stress of silicon anode with drastic volume changes during cycling. Harnessing the "hard to soft" gradient distribution strategy, the rigid PAA acts as a protective layer to dissipate the inner stress first during lithiation, while the elastic binder BFPU serves as a buffer layer to disperse residual stress, and thus avoids structural damage of rigid PAA. Moreover, the introduction of BFPU with fast self-healing ability can dynamically recover the microcracks arising from large stress, further ensuring the integrity of silicon anode. This multifunctional binder with smart design of double-wrapped structure provides enlightenment on enlarging the cycling life of high-energy-density lithium-ion batteries that suffer enormous volume change during the cycling process.

energy dissipation

self-healing binders

Si anodes

lithium-ion batteries

Författare

Xingxing Jiao

Shaanxi International Research Center for Soft Matter (IJRC-SM)

Jianqing Yin

Shaanxi International Research Center for Soft Matter (IJRC-SM)

Xieyu Xu

Moscow State University

Jialin Wang

Shaanxi International Research Center for Soft Matter (IJRC-SM)

Yangyang Liu

Shaanxi International Research Center for Soft Matter (IJRC-SM)

Shizhao Xiong

Chalmers, Fysik, Materialfysik

Qilu Zhang

Shaanxi International Research Center for Soft Matter (IJRC-SM)

Jiangxuan Song

Shaanxi International Research Center for Soft Matter (IJRC-SM)

Advanced Functional Materials

1616-301X (ISSN)

Vol. In Press 2005699

Ämneskategorier

Teknisk mekanik

Annan materialteknik

Kompositmaterial och -teknik

DOI

10.1002/adfm.202005699

Mer information

Senast uppdaterat

2020-11-09