Temperature-Controlled Synthesis of Li- and Mn-Rich Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ Hollow Nano/Sub-Microsphere Electrodes for High-Performance Lithium-Ion Battery.

ABSTRACT: The calcination temperature plays a significant role in the structural, textural, and energy-storage performance of metal oxide nanomaterials in Li-ion battery application. Here, we report the formation of well-crystallized homogeneously dispersed Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ hollow nano/sub-microsphere architectures through a simple cost-effective coprecipitation and chemical mixing route without surface modification for improving the efficiency of energy storage devices. The synthesized Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ hollow nano/sub-microsphere cathode materials are calcined at 800, 900, 950, and 1000 °C. Among them, Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ calcined at 950 °C exhibits a high discharge capacity (277 mAh g^-1 at 0.1C rate) and excellent capacity retention (88%) after 50 cycles and also delivers an excellent discharge capacity of >172 mAh g^-1 at 5C rate. Good electrochemical performance of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂-950 is directly related to the optimized size of its primary particles (85 nm) (which constitute the spherical secondary particle, ∼720 nm) and homogeneous cation mixing. Higher calcination temperature (≥950 °C) leads to an increase of the primary particle size, poor cycling stability, and inferior rate capacity of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ due to smashing of quasi-hollow spheres upon repeated lithium ion intercalations/deintercalations. Therefore, Li_1.2Mn_0.54Ni_0.13Co_0.13O₂-950 is a promising electrode for the next-generation high-voltage and high-capacity Li-ion battery application.

SUBMITTER: Alagar S 

PROVIDER: S-EPMC6893958 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature