Abstract
A potential Lithium-ion battery anode material Li 4-x Na x Ti 5 O 12 (0≤x≤0.15) has been synthesized via a facile hydrothermal method with short processing time and low temperature. The XRD and FE-SEM results indicate that samples with Na-doped are well-crystallized and have more homogeneous particle distributions with smaller overall particle size in the range of 300-600nm. Electrochemical tests reveal that Na-doped samples exhibit impressive specific capacity and cycle stability compared to pristine Li 4 Ti 5 O 12 at high rate. The Li 3.9 Na 0.1 Ti 5 O 12 electrode deliver an initial specific discharge capacity of 169mAh/g at 0.5C and maintained at 150.4mAh/g even after 40 cycles with the reversible retention of 88.99%. Finally, a simple solvothermal reduction method was used to fabricate Li 3.9 Na 0.1 Ti 5 O 12 /graphene(Li 3.9 Na 0.1 Ti 5 O 12 /G) composite. Galvanostatic charge-discharge tests demonstrate that this sample has remarkable capacities of 197.4mAh/g and 175.5mAh/g at 0.2C and 0.5C rate, respectively. This indicates that the Li 3.9 Na 0.1 Ti 5 O 12 /G composite is a promising anode material for using in lithium-ion batteries.
Highlights
Lithium-ion batteries are a new generation battery that have been rapidly developed over the past few decades
This paper proposes to employ a facial hydrothermal method to synthesize the Li4Ti5O12 anode material using LiOH and TiOC4H9˅4 as starting materials
All anode electrodes with and without Na-doping have a stable voltage platform at current rates of 0.2C or 0.5C, and the voltage platform occupies 80% of the discharge curve with Li4Ti5O12. This reveals that a stable Li4Ti5O12 material can be successfully synthesized by means of a facile hydrothermal method
Summary
Lithium-ion batteries are a new generation battery that have been rapidly developed over the past few decades. Li3.9Na0.1Ti5O12/G fabricated by the solvothermal reduction method has smaller overall particle size and larger specific surface area, and can form a conductive network by means of using two-dimensional structure of graphene, which greatly increase the electronic conductivity and diffusivity of the Li-ion. Electrochemical tests show it has outstanding electrochemical performances, which reveal that this material is a promising anode material for lithium-ion batteries
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