Dynamically Cross-Linked Polymeric Binder-Made Durable Silicon Anode of a Wide Operating Temperature Li-Ion Battery.

ACS Applied Materials & Interfaces
Zhen Hua XieMing Qiu Zhang

Abstract

The colossal volumetric expansion (up to 300%) of the silicon (Si) anode during repeated charge-discharge cycles destabilizes the electrode structure and causes a drastic drop in capacity. Here in this work, commercial poly(acrylic acid) (PAA) is cross-linked by hydroxypropyl polyrotaxane (HPR) via reversible boronic ester bonds to achieve a water-soluble polymeric binder (PAA-B-HPR) for making the Si anode of the Li-ion battery. Slidable α-cyclodextrins of modified polyrotaxane are allowed to move around when the unwanted volume variation occurs in the course of lithiation and delithiation so that the accumulated internal stress can be equalized throughout the system, while the reversible boronic ester bonds are capable of healing the damages created during manufacturing and service to maintain the electrode integrity. As a result, the Li-ion battery assembled with the Si anode comprised of the PAA-B-HPR binder possesses outstanding specific capacity and cycle stability within a wide temperature range from 25 to 55 °C. Especially, the Si@PAA-B-HPR anode exhibits a discharge specific capacity of 1056 mA h/g at 1.4 A/g after 500 cycles under a higher temperature of 55 °C, and the corresponding capacity fading rate per cycle is o...Continue Reading

References

Jan 9, 2016·ACS Applied Materials & Interfaces·Chao ChenYoungkwan Lee
Feb 8, 2018·Chemical Society Reviews·Tae-Woo KwonAli Coskun
Apr 25, 2018·ACS Applied Materials & Interfaces·Sang Ha LeeYoungkwan Lee
Aug 1, 2018·ACS Applied Materials & Interfaces·Yan ZhaoFeng Pan
Aug 8, 2018·Chemical Communications : Chem Comm·Yangfan LinDeren Yang
Mar 23, 2019·ACS Applied Materials & Interfaces·Rongnan GuoWei-Qiang Han
Jul 6, 2019·ACS Applied Materials & Interfaces·Chul-Ho JungSeong-Hyeon Hong
Oct 28, 2019·ACS Applied Materials & Interfaces·Andrea MirandaRafael Verduzco

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