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Facile Fabrication of Ethoxy-Functional Polysiloxane Wrapped LiNi Co Mn O Cathode with Improved Cycling Performance for Rechargeable Li-Ion Battery Hao Wang, Wujie Ge, Wen Li, Feng Wang, Wenjing Liu, Mei-zhen Qu, and Gongchang Peng ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.6b04644 • Publication Date (Web): 30 Jun 2016 Downloaded from http://pubs.acs.org on July 3, 2016
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ACS Applied Materials & Interfaces
Facile Fabrication of Ethoxy-Functional Polysiloxane Wrapped LiNi0.6Co0.2Mn0.2O2 Cathode with Improved Cycling Performance for Rechargeable Li-Ion Battery Hao Wang, †,‡ Wujie Ge, †,‡ Wen Li,§ Feng Wang,‡ Wenjing Liu,‡ Mei-Zhen Qu,‡ Gongchang Peng*,‡ †
Graduate University of Chinese Academy of Sciences, Beijing 100039, P.R. China.
‡
Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, P.R.
China. §
Hebei Academy of Sciences, Shijiazhuang 050000, P.R. China.
ABSTRACT
Dealing with the water molecule on the surface of LiNi0.6Co0.2Mn0.2O2 (NCM) cathode and hydrogen fluoride in the electrolyte is one of the most difficult challenges in Li-ion battery research.
In this
paper, the surface polymerization of tetraethyl orthosilicate (TEOS) on NCM to generate ethoxy-functional polysiloxane (EPS) wrapped NCM (E-NCM) cathode under mild conditions and without any additions is utilized to solve this intractable problem.
The differential scanning
calorimetry, transmission electron microscope and X-ray photoelectron spectroscopy results show that the formed amorphous coating can provide a protecting shell to improve the NCM thermal stability, suppress the thickening of the solid electrolyte interphase (SEI) layer and scavenge HF in the electrolyte.
The E-NCM composite with 2 mol% EPS delivers a high discharge capacity
retention of 84.9% after 100 cycles at a 1 C discharge rate in the 2.8 - 4.3 V potential range at 55 °C. Moreover, electrochemical impedance spectroscopy measurements reveal that the EPS coating could alleviate the impedance rise during cycling especially at an elevated temperature.
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Therefore, the
ACS Applied Materials & Interfaces
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fabricated E-NCM cathode with long-term cycling and thermal stability is a promising candidate for use in a high-energy Li-ion battery.
KEYWORDS: Ni-rich layered oxide, polysiloxane, surface modification, thermal stability, Li-ion battery.
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ACS Applied Materials & Interfaces
1. INTRODUCTION Layered lithium transition metal oxides Li[NixCoyMnz]O2 (0≤x,y,z
