NDLI: A homogeneous intergrown material of LiMn2O4 and LiNi0.5Mn1.5O4 as a cathode material for lithium-ion batteries

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhao, Jin-bao Lin, Wei-qing Yu, Yang-yang Li, Ji-yang Wu, Bi-he Wang, Jing
Copyright Year	2015
Abstract	Micro-/nano-structured spherical intergrown LiMn2O4–LiNi0.5Mn1.5O4 (LMO–LNMO I, LiNi0.25Mn1.75O4) particles as a cathode material have been synthesized by an impregnation method with highly reactive chestnut-like MnO2 nano-spheres as a manganese source and structural template. The LMO–LNMO I consisted of aggregates of nano-sized particles with a well-defined cubic spinel structure. The electrochemical performance and thermostability of LMO–LNMO I are better than those of a simple mechanical mixture of LiMn2O4 and LiNi0.5Mn1.5O4 (LMO–LNMO M), and much better than those of individual LiMn2O4 and LiNi0.5Mn1.5O4 monomers. Within this special structure, LNMO acts as a skeleton to stabilize the structure of LMO and enables more lithium ions in LMO to participate in the charge–discharge process along with those in LNMO, leading to high specific discharge capacities. In addition, this material exhibits excellent cycle stabilities at room temperature (25 °C) as well as at elevated temperature. It presented a discharge capacity of 130 mA h g−1, with 96.2% capacity retention after 100 cycles at 25 °C at 1 C. When the temperature and rate are increased to 55 °C and 5 C, it still delivers a discharge capacity of 131 mA h g−1, with a capacity retention of 95% after 100 cycles. Being synthesized by a special impregnation method, LMO–LNMO I shows a more homogeneous ion mixing of Ni and Mn in the structure at the atomic level with a more enhanced thermostability due to its high Mn content compared to LNMO. The structural stability and high electrical conductivity of LMO–LNMO I are responsible for the excellent electrochemical performance and outstanding thermal stability.
Starting Page	2353
Ending Page	2360
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	5
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta05311g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	LNMO Cathode Manganese Spinel Electrochemistry Thermostability Lithium Ion Electrical resistivity and conductivity
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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