Journal Article

FZJ-2016-02396

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A 3D porous Li-rich cathode material with an in situ modified surface for high performance lithium ion batteries with reduced voltage decay

He, X.Extern* ; Wang, J. ; Wang, R.FZJ* ; Qiu, B. ; Frielinghaus, H. (Corresponding author)FZJ* ; Niehoff, P. ; Liu, H. ; Stan, M. C. ; Paillard, E. ; Winter, M.FZJ* ; Li, J. (Corresponding author)

2016
RSC London {[u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/12690  doi:10.1039/C6TA01448H

Abstract: High crystallinity Li-rich porous materials integrated with an in situ formed surface containing carbonaceous compounds are synthesized through a facile approach. The rationally designed procedure involves the formation of a specific morphology of a hydroxide precursor assisted by a self-made template and subsequent high temperature treatment to obtain a Li1.2Mn0.56Ni0.16Co0.08O2 target product. The porous morphology is investigated using field-emission scanning electron microscopy and its surface area is quantitatively examined by gas sorption analysis coupled with the Brunauer–Emmett–Teller method. The crystallinity is characterized by X-ray diffraction and high-resolution transmission electron microscopy. X-ray photoelectron spectroscopy, CHN elemental analysis and small angle neutron scattering confirm the presence of carbonaceous compounds in the surface composition. The prepared material exhibits superior discharge rate capability and excellent cycling stability. It shows minor capacity loss after 100 cycles at 0.5C and retains 94.9% of its initial capacity after 500 cycles at 2C. Even more notably, the “voltage decay” during cycling is also significantly decreased. It has been found that carbonaceous compounds play a critical role in reducing the layered to spinel structural transformation during cycling. Therefore, the present porous Li-rich material with surface modified carbonaceous compounds represents an attractive material for advanced lithium-ion batteries.

Keyword(s): Energy (1st) ; Condensed Matter Physics (2nd) ; Chemistry (2nd) ; Industrial Application (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
2. Neutronenstreuung (Neutronenstreuung ; JCNS-1)
3. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)

Research Program(s):

1. 131 - Electrochemical Storage (POF3-131) (POF3-131)
2. 144 - Controlling Collective States (POF3-144) (POF3-144)
3. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
4. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
5. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. KWS-1: Small angle scattering diffractometer (NL3b)

Appears in the scientific report 2016

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Database coverage:
; ; Allianz-Lizenz / DFG ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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