Enhanced capacity and lower mean charge voltage of Li-rich cathodes for lithium ion batteries resulting from low-temperature electrochemical activation

N-methyl-N-allylpyrrolidinium bis (trifluoromethanesulfonyl) imide (PYR1ATFSI) with substantial supercooling behavior is synthesized to develop low temperature electrolyte for lithium-ion batteries. Additive fluoroethylene carbonate (FEC) in LiTFSI/PYR1ATFSI/EC/PC/EMC is found that it can reduce the freezing point. LiFePO4/Li coin cells with the FEC-PYR1ATFSI electrolyte exhibit good capacity retention, reversible cycling behavior at low temperatures. The good performance can be attributed to the decrease in the freezing point and the polarization of the composite electrolyte.

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Improved low-temperature performance of surface modified lithium-rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode materials for lithium ion batteries

Solid State Ionics ◽

10.1016/j.ssi.2020.115245 ◽

2020 ◽

Vol 347 ◽

pp. 115245 ◽

Cited By ~ 1

Author(s):

Bing Zhao ◽

Jingwei Xie ◽

Hua Zhuang ◽

Xiaoyu Liu ◽

Wenrong Li ◽

...

Keyword(s):

Low Temperature ◽

Lithium Ion Batteries ◽

Cathode Materials ◽

Lithium Ion ◽

Temperature Performance ◽

Low Temperature Performance ◽

Surface Modified

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Synthesis of LiCo0.3Ni0.7O2 as cathode materials for lithium ion batteries by oxidation-ion exchange of β-Co0.3Ni0.7(OH)2 and LiOH at low temperature

Materials Chemistry and Physics ◽

10.1016/j.matchemphys.2007.08.004 ◽

2008 ◽

Vol 107 (2-3) ◽

pp. 385-391 ◽

Cited By ~ 4

Author(s):

Dong-Ge Tong ◽

Ai-Dong Tang ◽

Wei Chu ◽

Lian-Xing Tang ◽

Ke-Long Huang ◽

...

Keyword(s):

Low Temperature ◽

Ion Exchange ◽

Lithium Ion Batteries ◽

Cathode Materials ◽

Lithium Ion

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Preparation and Effect of (3-aminopropyl)triethoxysilane-Coated LiNi0.5Co0.2Mn0.3O2 Cathode Material for Lithium Ion Batteries

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.17406 ◽

2020 ◽

Vol 20 (6) ◽

pp. 3460-3465

Author(s):

Mi-Ra Shin ◽

Seon-Jin Lee ◽

Seong-Jae Kim ◽

Tae-Whan Hong

Keyword(s):

Cathode Material ◽

Lithium Ion Batteries ◽

Cathode Materials ◽

Photoelectron Spectroscopy ◽

Coating Layer ◽

Lithium Ion ◽

X Ray ◽

Amine Groups ◽

Coating Layers ◽

Discharge Capacities

Surface coating using (3-aminopropyl)triethoxysilane (APTES) has been applied to improve the electrochemical properties of LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode materials. The APTES coating layer on the surface of NCM523 protects the direct contact area between the cathode material and the electrolyte, and facilitates the presence of electrons through the abundance of electron-rich amine groups, thereby improving electrochemical performance. X-ray photoelectron spectroscopy confirmed the existence of APTES coating layers on the surface of NCM523 cathode materials, revealing three peaks—N1s, O1s, and Si1s—that were not identified in bare NCM523. In addition, the discharge capacities of the bare electrode and the APTES-coated NCM523 electrode were 121.06 mAh/g and 156.43 mAh/g, respectively. To the best of our knowledge, the use of an APTES coating on NCM523 cathode materials for lithium-ion batteries has never been reported.

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