Interlayer mixing in lithium nickel manganese cobalt oxide cathode materials for rechargeable lithium batteries
Composition of LiNi1/3Mn1/3Co1/3O2 and its analogous Li[(Ni0.5Mn0.5)1-xCox]O2 were prepared by conventional solid state method to evaluate the effect of reducing cobalt contents to the layered rock salt-type cathode materials. Structural analysis using Rietveld refinement of conventional XRD data...
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my-unimap-441212016-11-22T07:01:48Z Interlayer mixing in lithium nickel manganese cobalt oxide cathode materials for rechargeable lithium batteries Tan, Tze Qing Composition of LiNi1/3Mn1/3Co1/3O2 and its analogous Li[(Ni0.5Mn0.5)1-xCox]O2 were prepared by conventional solid state method to evaluate the effect of reducing cobalt contents to the layered rock salt-type cathode materials. Structural analysis using Rietveld refinement of conventional XRD data revealed that the amount of cobalt contents is highly correlated to their structural stability. Solid solution limit for phasepure samples that were prepared is about x > 0.2 for Li[(Ni0.5Mn0.5)1-xCox]O2. The amount of interlayer mixing increased for samples contain 20% or less cobalt contents. The results showed that the minimum amount of interlayer mixing that could be achieved is about 3.8% for the composition of LiNi0.4Mn0.4Co0.2O2 that was prepared at 950 oC in oxygen compared to LiNi1/3Mn1/3Co1/3O2 which is about 2%. However, the amount of interlayer mixing varies as a function of temperatures and conditions. Systematic investigation have been done to optimize refinement parameters and to validate structural model based on LiCoO2 as a standard. On the other hand, the initial charge and discharge capacities during battery cycling for LiNi0.4Mn0.4Co0.2O2 is relatively high which recorded ~323 mAh g-1 and ~229 mAh g-1 respectively. But it has high irreversible capacity loss after a few cycles that are probably due to structural instability during charge and discharge. Universiti Malaysia Perlis (UniMAP) 2014 Thesis en http://dspace.unimap.edu.my:80/xmlui/handle/123456789/44121 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44121/3/license.txt 8a4605be74aa9ea9d79846c1fba20a33 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44121/1/p.1-24.pdf dd923cde3014da465fc756befa9b97fe http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44121/2/full%20text.pdf e78bcb34d13b5f909151cd4c8c095665 Interlayer mixing Lithium batteries Cathode materials Lithium ion batteries School of Materials Engineering |
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Universiti Malaysia Perlis |
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English |
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Interlayer mixing Lithium batteries Cathode materials Lithium ion batteries |
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Interlayer mixing Lithium batteries Cathode materials Lithium ion batteries Tan, Tze Qing Interlayer mixing in lithium nickel manganese cobalt oxide cathode materials for rechargeable lithium batteries |
| description |
Composition of LiNi1/3Mn1/3Co1/3O2 and its analogous Li[(Ni0.5Mn0.5)1-xCox]O2 were
prepared by conventional solid state method to evaluate the effect of reducing cobalt
contents to the layered rock salt-type cathode materials. Structural analysis using
Rietveld refinement of conventional XRD data revealed that the amount of cobalt
contents is highly correlated to their structural stability. Solid solution limit for phasepure
samples that were prepared is about x > 0.2 for Li[(Ni0.5Mn0.5)1-xCox]O2. The
amount of interlayer mixing increased for samples contain 20% or less cobalt contents.
The results showed that the minimum amount of interlayer mixing that could be
achieved is about 3.8% for the composition of LiNi0.4Mn0.4Co0.2O2 that was prepared at
950 oC in oxygen compared to LiNi1/3Mn1/3Co1/3O2 which is about 2%. However, the
amount of interlayer mixing varies as a function of temperatures and conditions.
Systematic investigation have been done to optimize refinement parameters and to
validate structural model based on LiCoO2 as a standard. On the other hand, the initial
charge and discharge capacities during battery cycling for LiNi0.4Mn0.4Co0.2O2 is
relatively high which recorded ~323 mAh g-1 and ~229 mAh g-1 respectively. But it has
high irreversible capacity loss after a few cycles that are probably due to structural
instability during charge and discharge. |
| format |
Thesis |
| author |
Tan, Tze Qing |
| author_facet |
Tan, Tze Qing |
| author_sort |
Tan, Tze Qing |
| title |
Interlayer mixing in lithium nickel manganese cobalt oxide cathode materials for rechargeable lithium batteries |
| title_short |
Interlayer mixing in lithium nickel manganese cobalt oxide cathode materials for rechargeable lithium batteries |
| title_full |
Interlayer mixing in lithium nickel manganese cobalt oxide cathode materials for rechargeable lithium batteries |
| title_fullStr |
Interlayer mixing in lithium nickel manganese cobalt oxide cathode materials for rechargeable lithium batteries |
| title_full_unstemmed |
Interlayer mixing in lithium nickel manganese cobalt oxide cathode materials for rechargeable lithium batteries |
| title_sort |
interlayer mixing in lithium nickel manganese cobalt oxide cathode materials for rechargeable lithium batteries |
| granting_institution |
Universiti Malaysia Perlis (UniMAP) |
| granting_department |
School of Materials Engineering |
| url |
http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44121/1/p.1-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/44121/2/full%20text.pdf |
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