1 research outputs found
Nanorod-Nanoflake Interconnected LiMnPO<sub>4</sub>·Li<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>/C Composite for High-Rate and Long-Life Lithium-Ion Batteries
Olivine-type
structured LiMnPO<sub>4</sub> has been extensively studied as a high-energy
density cathode material for lithium-ion batteries. However, preparation
of high-performance LiMnPO<sub>4</sub> is still a large obstacle due
to its intrinsically sluggish electrochemical kinetics. Recently,
making the composites from both active components has been proven
to be a good proposal to improve the electrochemical properties of
cathode materials. The composite materials can combine the advantages
of each phase and improve the comprehensive properties. Herein, a
LiMnPO<sub>4</sub>·Li<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>/C composite with interconnected nanorods and nanoflakes
has been synthesized via a one-pot, solid-state reaction in molten
hydrocarbon, where the oleic acid functions as a surfactant. With
a highly uniform hybrid architecture, conductive carbon coating, and
mutual cross-doping, the LiMnPO<sub>4</sub>·Li<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>/C composite manifests high capacity,
good rate capability, and excellent cyclic stability in lithium-ion
batteries. The composite electrodes deliver a high reversible capacity
of 101.3 mAh g<sup>–1</sup> at the rate up to 16 C. After 4000
long-term cycles, the electrodes can still retain 79.39% and 72.74%
of its maximum specific discharge capacities at the rates of 4C and
8C, respectively. The results demonstrate that the nanorod-nanoflake
interconnected LiMnPO<sub>4</sub>·Li<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>/C composite is a promising cathode material
for high-performance lithium ion batteries