High Lithium Storage Performance of Co Ion-Doped Li4Ti5O12 Induced by Fast Charge Transport

Wang, M.; Chen, Y.; Yang, Chengyu; Zeng, Y. H.; Fang, P. F.; Wang, W.; Wang, X. L.

doi:10.3389/fchem.2022.919552

Cited by 5 publications

(2 citation statements)

References 31 publications

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“…LTO and CTAB were added to 25% alcohol aqueous solution (50 mL of 25% alcohol aqueous solution per 0.1 g LTO) at a mass ratio of 1:1 and ultrasonicated for 2 h. The pH value of GO (prepared by the improved Hummer's method 31 ) solution was adjusted to 8−11 by using 1 mol/L NaOH solution, then slowly added GO into the mixed solution of LTO and CTAB, placed in a 100 mL PTFE lined stainless steel autoclave, and kept at 180 °C for 12 h. After cooling to room temperature, the LTO/rGO composite was obtained by repeated washing with distilled water.…”

Section: Methodsmentioning

confidence: 99%

“…In order to solve the shortcomings of LTO, some modification methods such as morphology and size improvement, metal ion doping, and surface-coated conductive materials (e.g., carbon nanotubes and biomass carbon) were reported. − Zhu et al prepared hollow TiO 2 microspheres by the Ostwald ripening method, and then LTO was synthesized by a simple hydrothermal synthesis method using hollow TiO 2 microspheres as a template. It was found that the hollow LTO microspheres calcined at 700 °C showed good electrochemical performance, including high capacity (174.6 mAh/g at 1C), excellent cycling stability (97.7% capacity retention after 50 cycles at 1C), and remarkable rate capability (140.3 mAh/g at 15C).…”

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional Network Microstructure Design of the Li₄Ti₅O₁₂/rGO Nanocomposite as an Anode Material for High-Performance Lithium-Ion Batteries

Wang

Wei

et al. 2023

J. Phys. Chem. C

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At present, the wide commercial application of Li 4 Ti 5 O 12 (LTO) is limited as an anode for lithium-ion batteries because of its poor conductivity and lower rate performance. In this paper, LTO nanoparticles were embedded in a reduced graphene oxide (rGO) conductive network by an in situ electrostatic selfassembly effect using a simple hydrothermal reduction method. The microstructure and electrochemical performance of the LTO/ rGO composite were investigated. The highlighted results showed that LTO nanoparticles were combined with rGO nanosheets by a Ti−O−C covalent bond, which was more stable than other bonding methods. At the same time, the addition of rGO not only enriches the structure and increases the specific surface area but also effectively prevents the agglomeration of LTO. The higher conductivity of LTO nanoparticles was bestowed by the rGO three-dimensional (3D) network, causing structural stability and high electrochemical performance. The LTO/rGO composite has high first discharge capacity (643.9 mAh/g at 0.5C), remarkable rate performance (290 mAh/g at 10C), and excellent cycle stability (271.7 mAh/g after the 1000th cycle at 10C) when tested in a half battery. Furthermore, it has higher discharge capacity (181.8 mAh/g at 1C, the first Coulombic efficiency was 90.1%) and excellent cycle stability (142.8 mAh/g after 500 cycles at 20C) when assembled into a full battery as the anode with commercial LiFePO 4 (LFP) as the cathode. The lithium storage mechanism of the LTO/graphene composite was further discussed by first-principles calculations. With the addition of graphene to LTO, the electron transport ability was improved and the diffusion energy barrier was reduced. This made the composite expected to become a promising anode material for lithium-ion batteries.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Network Microstructure Design of the Li₄Ti₅O₁₂/rGO Nanocomposite as an Anode Material for High-Performance Lithium-Ion Batteries

Wang

Wei

et al. 2023

J. Phys. Chem. C

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High‐Pressure Induction and Quantitative Regulation of Oxygen Vacancy Defects in Lithium Titanate

Qin

Liang

et al. 2023

Adv Funct Materials

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Inspired by the functional properties of ion defect induction and charge compensation in defect engineering, these methods are expected to be an effective strategy to solve the constraints of Li4Ti5O12 (LTO) inherent conductivity and diffusion dynamics, and further improve battery rate performance. The oxygen vacancy (OV) content in LTO can be controlled quantitatively by high‐pressure induction using the high‐pressure and high‐temperature (HPHT) method. In addition, the relationship between the electrochemical properties and OV is further explored. The theoretical calculations indicate that the OV defects cause the electrons to delocalize into the conduction band of the LTO, and thus fundamentally improve the intrinsic conductivity. In particular, the high‐pressure quenching strategy of HPHT causes LTO to instantly produce crack holes with massive crystalline layers, which can be regarded as storage for the electrolyte to facilitate ion diffusion. The fabricated LTO anodes containing OVs compensate for the limitation of the poor rate performance with a capacity of 176 mAh g−1 at 20 C. Pressure‐induced OV defects not only open up a new perspective in the field of lithium‐ion batteries (LIBs), but also provide a certain degree of freedom for the functional design characteristics of defect engineering.

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The interface effect on the lithiation of silicon/graphene composites: The first principles study

Wang,

Yang,

Leng

et al. 2024

Int J of Quantum Chemistry

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To reveal the interaction mechanism between lithium (Li) and silicon/graphene (Si/Gra) interface at the atomic scale, it was calculated that the energy band structure, density of states, charge transfer, radial distribution function and Li diffusion coefficient based on the first principles. The results indicated that the volume expansion of Si was effectively limited by the Si/Gra interface during Li insertion. There appeared the interface effect of Si/Gra on the combination of Li and Si atoms, according to the longer Li‐C (2.9 Å) and the larger electron cloud near the Li atom at the Si/Gra interface. The better diffusion channel for Li atoms was constructed at the Si/Gra interface, due to the lower diffusion energy barrier (0.42–0.44 eV) and higher diffusion coefficient (DLi = 0.784 × 10−4 cm2/s) for Li+ diffusion.

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High Lithium Storage Performance of Co Ion-Doped Li4Ti5O12 Induced by Fast Charge Transport

Cited by 5 publications

References 31 publications

Three-Dimensional Network Microstructure Design of the Li₄Ti₅O₁₂/rGO Nanocomposite as an Anode Material for High-Performance Lithium-Ion Batteries

Three-Dimensional Network Microstructure Design of the Li₄Ti₅O₁₂/rGO Nanocomposite as an Anode Material for High-Performance Lithium-Ion Batteries

High‐Pressure Induction and Quantitative Regulation of Oxygen Vacancy Defects in Lithium Titanate

The interface effect on the lithiation of silicon/graphene composites: The first principles study

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High Lithium Storage Performance of Co Ion-Doped Li4Ti5O12 Induced by Fast Charge Transport

Cited by 5 publications

References 31 publications

Three-Dimensional Network Microstructure Design of the Li4Ti5O12/rGO Nanocomposite as an Anode Material for High-Performance Lithium-Ion Batteries

Three-Dimensional Network Microstructure Design of the Li4Ti5O12/rGO Nanocomposite as an Anode Material for High-Performance Lithium-Ion Batteries

High‐Pressure Induction and Quantitative Regulation of Oxygen Vacancy Defects in Lithium Titanate

The interface effect on the lithiation of silicon/graphene composites: The first principles study

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Product

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Three-Dimensional Network Microstructure Design of the Li₄Ti₅O₁₂/rGO Nanocomposite as an Anode Material for High-Performance Lithium-Ion Batteries

Three-Dimensional Network Microstructure Design of the Li₄Ti₅O₁₂/rGO Nanocomposite as an Anode Material for High-Performance Lithium-Ion Batteries