TY - JOUR
AU - Yulin Ma
AU - Yan Zhou
AU - Chunyu Du
AU - Pengjian Zuo
AU - Xinqun Cheng
AU - Lili Han
AU - Dennis Nordlund
AU - Yunzhi Gao
AU - Geping Yin
AU - Huolin L Xin
AU - Marca M Doeff
AU - Feng Lin
AU - Guoying Chen
AB - <p><span>Surface degradation on cycled lithium-ion battery cathode particles is governed not only by intrinsic thermodynamic properties of the material but also, oftentimes more predominantly, by the side reactions with the electrolytic solution. A superior electrolyte inhibits these undesired side reactions on the cathode and at the electrolyte interface, which consequently minimizes the deterioration of the cathode surface. The present study investigates a new boron-based anion receptor, tris(2,2,2-trifluoroethyl)borate (TTFEB), as an electrolyte additive in cells containing a lithium- and manganese-rich layered oxide cathode, Li</span><span>1.16</span><span>Ni</span><span>0.2</span><span>Co</span><span>0.1</span><span>Mn</span><span>0.54</span><span>O</span><span>2</span><span>. Our electrochemical studies demonstrate that the cycling performance and Coulombic efficiency are significantly improved because of the additive, in particular, under elevated temperature conditions. Spectroscopic analyses revealed that the addition of 0.5 wt % TTFEB is capable of reducing the content of lithium-containing inorganic species within the cathode-electrolyte interphase layer and minimizing the reduction of tetravalent Mn</span><span>4+</span><span>&nbsp;at the cathode surface. Our work introduces a novel additive highly effective in improving lithium-ion battery performance, highlights the importance in preserving the surface properties of cathode materials, and provides new insights on the working mechanism of electrolyte additives.</span></p>
BT - Chemistry of Materials
DA - 02/2017
DO - 10.1021/acs.chemmater.6b04784
IS - 5
LA - eng
N2 - <p><span>Surface degradation on cycled lithium-ion battery cathode particles is governed not only by intrinsic thermodynamic properties of the material but also, oftentimes more predominantly, by the side reactions with the electrolytic solution. A superior electrolyte inhibits these undesired side reactions on the cathode and at the electrolyte interface, which consequently minimizes the deterioration of the cathode surface. The present study investigates a new boron-based anion receptor, tris(2,2,2-trifluoroethyl)borate (TTFEB), as an electrolyte additive in cells containing a lithium- and manganese-rich layered oxide cathode, Li</span><span>1.16</span><span>Ni</span><span>0.2</span><span>Co</span><span>0.1</span><span>Mn</span><span>0.54</span><span>O</span><span>2</span><span>. Our electrochemical studies demonstrate that the cycling performance and Coulombic efficiency are significantly improved because of the additive, in particular, under elevated temperature conditions. Spectroscopic analyses revealed that the addition of 0.5 wt % TTFEB is capable of reducing the content of lithium-containing inorganic species within the cathode-electrolyte interphase layer and minimizing the reduction of tetravalent Mn</span><span>4+</span><span>&nbsp;at the cathode surface. Our work introduces a novel additive highly effective in improving lithium-ion battery performance, highlights the importance in preserving the surface properties of cathode materials, and provides new insights on the working mechanism of electrolyte additives.</span></p>
PY - 2017
SP - 2141 
EP -  2149
ST - Chem. Mater.
T2 - Chemistry of Materials
TI - A New Anion Receptor for Improving the Interface between Lithium- and Manganese-Rich Layered Oxide Cathode and the Electrolyte
VL - 29
SN - 0897-4756
ER -