Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201704808
Keywords
Cr doping; cycling performance; high voltage; LiNi0.45Cr0.1Mn1.45O4; low temperature
Categories
Funding
- National Basic Research Program of China (973 Program) [2014CB239701]
- National Natural Science Foundation of China [51372116, 51672128, 21773118]
- Natural Science Foundation of Jiangsu Province [BK20151468]
- Prospective Joint Research Project of Cooperative Innovation Fund of Jiangsu Province [BY-2015003-7]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Funding for Outstanding Doctoral Dissertation in NUAA [BCXJ14-12]
- Funding of Jiangsu Innovation Program for Graduate Education [KYLX_0254]
- Founding of Graduate Innovation Center in NUAA [kfjj20160601, kfjj20170607]
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Spinel LiNi0.45Cr0.1Mn1.45O4 synthesized by a scalable solution route combined by high temperature calcination is investigated as cathode for ultralong-life lithium-ion batteries in a wide operating temperature range. Scanning electron microscopy reveals homogeneous microsized polyhedral morphology with highly exposed {100} and {111} surfaces. The most highlighted result is that LiNi0.45Cr0.1Mn1.45O4 has extremely long cycle performance and high capacity retention at various temperatures (0, 25, 50 degrees C), indicating that Cr doping is a prospective approach to enable 5 V LiNi0.45Cr0.1Mn1.45O4 (LNMO)-based cathode materials with excellent cycling performances for commercial applications. After 1000 cycles, the capacity retention of LiNi0.45Cr0.1Mn1.45O4 is 100.30% and 82.75% at 0 degrees C and 25 degrees C at 1 C rate, respectively. Notably, over 350 cycles at 50 degrees C, the capacity retention of LiNi0.45Cr0.1Mn1.45O4 can maintain up to 91.49% at 1 C. All the values are comparable to pristine LNMO, which can be attributed to the elimination of LiyNi1-yO impurity phase, highly exposed {100} surfaces, less Mn3+ ions, and enhancement of ion and electron conductivity by Cr doping. Furthermore, an assembled LiNi0.45Cr0.1Mn1.45O4/Li4Ti5O12 full cell delivers an initial discharge capacity of 101 mA h g(-1), meanwhile the capacity retention is 82.07% after 100 cycles.
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