387 0

Performance improvement of Ni-rich layered cathode by doping

Title
Performance improvement of Ni-rich layered cathode by doping
Author
박정현
Alternative Author(s)
박정현
Advisor(s)
윤종승
Issue Date
2022. 2
Publisher
한양대학교
Degree
Master
Abstract
The 1 mol% of Nb dopant elongates primary particles and align them in the radial direction, creating a composition that dissipates the abrupt internal strain caused by H2-H3 phase transition near the end of charging. Nb doping of Li[Ni0.855Co0.13Al0.015]O2 changes its primary particle morphology to allow precise ordering of its microstructure. The negation of the internal strain generally improves the long term cycling stability that is achieved by Nb-doped Li[Ni0.855Co0.13tjAl0.015]O2 cathode(Nb-doped cathodes retain 90 % of its initial capacity after 1000 cycles while undoped cathodes retains 57.3%). The Nb-doped cathode also stands out for enhanced chemical and structural stability during calendar aging and under thermal stress. Simple strategy of putting Nb ions in cathode during the lithiation of Li[Ni0.855Co0.13Al0.015]O2, proposed in this paper, represents an effective solution guaranteeing sufficient battery life, safety, and fast charging without compromising battery capacity for next-generation electric vehicles. Moreover, the enhanced chemical and mechanical stability of the Nb-doped NCA85 cathode can used at fast charging condition; thus, the Nb-doped NCA85 cathode has stable cycling for 500 cycling even when charged at 3 C (full charge takes 20 minutes).
URI
http://hanyang.dcollection.net/common/orgView/200000590490https://repository.hanyang.ac.kr/handle/20.500.11754/168274
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > MATERIALS SCIENCE & ENGINEERING(신소재공학과) > Theses (Master)
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE