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Tris(trimethylsilane) Phosphite Additive for Improving the High Voltage Cycling Performance of a Nickel-Rich Layered Oxide Cathode Material
Author NameAffiliationE-mail
DONG Qing-Yu School of Nano Technology and Nano Bionics, University of Science and Technology of China, Hefei 230026, China
Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, China 		 
MAO Ya-Yun Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, China
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China 		 
GUO Feng School of Nano Technology and Nano Bionics, University of Science and Technology of China, Hefei 230026, China
Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, China 		 
CHENG Zhen-Jie School of Nano Technology and Nano Bionics, University of Science and Technology of China, Hefei 230026, China
Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, China 		 
DONG Hou-Cai Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, China
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China 		 
CHEN Peng Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, China
Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, Jiangsu 215123, China 		 
KANG Tuo Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, China  
WU Xiao-Dong School of Nano Technology and Nano Bionics, University of Science and Technology of China, Hefei 230026, China
Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, China 		 
SHEN Yan-Bin School of Nano Technology and Nano Bionics, University of Science and Technology of China, Hefei 230026, China
Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, China 		ybshen2017@sinano.ac.cn 
CHEN Li-Wei Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, China  
Abstract: Nickel-rich layered oxide cathode material, Li-NixMnyCo1-x-yO2 (x ≥ 0.8), has a specific capacity as high as 220 mAh·g-1 (x=0.83, 0.1C, 1C=180 mA·g-1) when being charged to 4.5 V (vs Li/Li+), thus it is a very attractive material for the development of high energy density lithium ion batteries. In this work, we have regulated the composition and structure of the cathodeelectrolyte interface (CEI)film on the surface of a nickel-rich layered oxide cathode material (LiNi0.83Mn0.05Co0.12O2) by adding tris(trimethylsilane) phosphite (TMSP) in the electrolyte and investigated how the additive affect the electrochemical performance of the Li‖LiNi0.83Mn0.05Co0.12O2 cell. The TMSP additive helps producing a CEI layer on the surface of the LiNi0.83Mn0.05Co0.12O2 cathode material by electrochemical characterization methods, theoretical calculation, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). The CEI layer wasfound to be thin and uniformly distributed on the cathode surface even after 150 cycles at 1C between 2.8 to 4.5 V (vs Li/Li+), and it was rich in Li2CO3 and Si-O-C, but limited in electrolyte decomposition products, i.e. ROCO2Li and LiF. The CEI layer effectively reduced the polarization of the Li‖LiNi0.83Mn0.05Co0.12O2 cell during cycling which could be due to uniform lithium diffusion that enabled by the uniform CEI thickness, and it was also able to protect the cathode material from structure damaging by suppressing the dissolution of transitional metal ions, resulting in improved high voltage (4.5 V vs Li/Li+) cycling performance and rate capability of the Li‖LiNi0.83Mn0.05Co0.12O2 cells.
Keywords: nickel-rich layered oxide  tris(trimethylsilane) phosphite  lithium ion battery  high energy density
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DONG Qing-Yu,MAO Ya-Yun,GUO Feng,CHENG Zhen-Jie,DONG Hou-Cai,CHEN Peng,KANG Tuo,WU Xiao-Dong,SHEN Yan-Bin,CHEN Li-Wei.Tris(trimethylsilane) Phosphite Additive for Improving the High Voltage Cycling Performance of a Nickel-Rich Layered Oxide Cathode Material[J].Chinese Journal of Inorganic Chemistry,2019,35(6):1050-1058.
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Chinese Journal of Inorganic Chemistry