Effects of fast lithium-ion conductive coating layer on the nickel rich layered oxide cathode material

Li-rich layered oxide cathode materials have become one of the most promising cathode materials for high specific energy lithium-ion batteries owning to its high theoretical specific capacity, low cost, high operating voltage and environmental friendliness. Yet they suffer from severe capacity and voltage attenuation during prolong cycling, which blocks their commercial application. To clarify these causes, we synthesize Li1.5Mn0.55Ni0.4Co0.05O2.5 (Li1.2Mn0.44Ni0.32Co0.04O2) with high-nickel-content cathode material by a solid-sate complexation method, and it manifests a lot slower capacity and voltage attenuation during prolong cycling compared to Li1.5Mn0.66Ni0.17Co0.17O2.5 (Li1.2Mn0.54Ni0.13Co0.13O2) and Li1.5Mn0.65Ni0.25Co0.1O2.5 (Li1.2Mn0.52Ni0.2Co0.08O2) cathode materials. The capacity retention at 1 C after 100 cycles reaches to 87.5% and the voltage attenuation after 100 cycles is only 0.460 V. Combining X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscopy (TEM), it indicates that increasing the nickel content not only stabilizes the structure but also alleviates the attenuation of capacity and voltage. Therefore, it provides a new idea for designing of Li-rich layered oxide cathode materials that suppress voltage and capacity attenuation.

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A novel strategy to significantly enhance the initial voltage and suppress voltage fading of a Li- and Mn-rich layered oxide cathode material for lithium-ion batteries

Journal of Materials Chemistry A ◽

10.1039/c7ta10887g ◽

2018 ◽

Vol 6 (8) ◽

pp. 3610-3624 ◽

Cited By ~ 46

Author(s):

Shiming Zhang ◽

Jian Chen ◽

Tian Tang ◽

Yinzhu Jiang ◽

Gairong Chen ◽

...

Keyword(s):

Cathode Material ◽

Lithium Ion Batteries ◽

Lithium Ion ◽

Composite Cathode ◽

Surface Phase ◽

Layered Oxide ◽

Initial Voltage ◽

Oxide Cathode ◽

Novel Strategy

A Li[Li0.2Ni0.13Co0.13Mn0.54]O2–xLiNiO2 composite cathode with a Ni-rich bulk phase and in situ precipitated Ni-rich spinel-like surface phase has been built to enhance the initial voltage and suppress voltage fading during cycling.

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Effect of Different Composition on Voltage Attenuation of Li-Rich Cathode Material for Lithium-ion Batteries

10.20944/preprints201912.0139.v1 ◽

2019 ◽

Author(s):

Jun Liu ◽

Qiming Liu ◽

Huali Zhu ◽

Feng Lin ◽

Yan Ji ◽

...

Keyword(s):

Cathode Material ◽

Lithium Ion Batteries ◽

Cathode Materials ◽

Nickel Content ◽

Lithium Ion ◽

High Energy ◽

Commercial Application ◽

Layered Oxide ◽

Oxide Cathode ◽

Voltage Attenuation

Li-rich layered oxide cathode materials have become one of the most promising cathode materials for high-energy-density lithium-ion batteries owning to its high theoretical specific capacity, low cost, high operating voltage and environmental friendliness. Yet they suffer from severe capacity and voltage attenuation during prolong cycling, which blocks their commercial application. To clarify these causes, we synthesize 0.5Li2MnO3·0.5LiNi0.8Co0.1Mn0.1O2 (LL-811) with high-nickel-content cathode material by a solid-sate complexation method, and it manifests a lot slower capacity and voltage attenuation during prolong cycling compared to LL-111 and LL-523 cathode materials. The capacity retention at 1C after 100 cycles reaches to 87.5% and the voltage attenuation after 100 cycles is only 0.460 V. Combining X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM), it indicates that increasing the nickel content not only stabilizes the structure but also alleviates the attenuation of capacity and voltage. Therefore, it provides a new idea for designing of Li-rich layered oxide cathode materials that suppress voltage and capacity attenuation.

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