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A carbon-coated li 4 ti 5 o 12 ‑tio 2 /sn nanocomposite material and its preparation and application

A nanocomposite material, li1.81h0.19ti2o5 xh2o technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of unsatisfactory reversible capacity and cycle stability, Sn nanoparticles Easy agglomeration, unsatisfactory cycle stability and other problems, to achieve the effect of improving electronic conductivity and ion permeability, shortening migration distance, and excellent electrochemical performance

Inactive Publication Date: 2017-11-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cycling stability of Sn nanoparticles is still unsatisfactory due to the easy agglomeration of Sn nanoparticles.
Currently, about Li 4 Ti 5 o 12 The report of composite modification with Sn metal is only a simple physical mixing, and Sn nanopowder still has serious agglomeration phenomenon, and the reversible capacity and cycle stability are not ideal.

Method used

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  • A carbon-coated li <sub>4</sub> ti <sub>5</sub> o <sub>12</sub> ‑tio <sub>2</sub> /sn nanocomposite material and its preparation and application
  • A carbon-coated li <sub>4</sub> ti <sub>5</sub> o <sub>12</sub> ‑tio <sub>2</sub> /sn nanocomposite material and its preparation and application
  • A carbon-coated li <sub>4</sub> ti <sub>5</sub> o <sub>12</sub> ‑tio <sub>2</sub> /sn nanocomposite material and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 2.5g P 25 TiO 2 Mix it with 80mL of NaOH solution with a concentration of 10mol / L, stir for 4h, then carry out hydrothermal reaction for 96h, and the hydrothermal temperature is 120°C. After the reaction, the product was added to excess dilute nitric acid with a concentration of 0.1 mol / L and stirred for 0.5 h. After centrifugation, the product was dried at 60° C. to obtain white fluffy titanic acid nanopowder.

Embodiment 2

[0051] 6.5g rutile TiO 2 Mix with 80mL of KOH solution with a concentration of 15mol / L, stir for 5h, and then carry out hydrothermal reaction for 30h, and the hydrothermal temperature is 150°C. After the reaction, the product was added to excess dilute hydrochloric acid with a concentration of 0.8 mol / L and stirred for 12 hours. After suction filtration, the product was dried at 60° C. to obtain white fluffy titanic acid nanopowder.

Embodiment 3

[0053] 9.5g anatase TiO 2 Mix with 80mL of NaOH solution with a concentration of 20mol / L, stir for 3h, then carry out hydrothermal reaction for 72h, and the hydrothermal temperature is 180°C. After the reaction, the product was added to excess dilute hydrochloric acid with a concentration of 0.5 mol / L and stirred for 10 h. After suction filtration, the product was dried at 60° C. to obtain white fluffy titanic acid nanopowder. TEM image of the material see figure 1 .

[0054] Li 1.81 h 0.19 Ti 2 o 5 ·xH 2 O / SnO 2 Precursor preparation

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Abstract

The invention belongs to the technical field of preparation and application of nano materials and particularly relates to a carbon-coated Li4Ti5O12-TiO2 / Sn nanocomposite and preparation and application thereof. The carbon-coated Li4Ti5O12-TiO2 / Sn nanocomposite is composed of 19wt%-65wt% of Li4Ti5O12, 11wt%-57wt% of TiO2, 23wt%-49wt% of Sn and 1wt%-24wt% of a carbon coating layer. The carbon-coated Li4Ti5O12-TiO2 / Sn nanocomposite gives play to synergistic effects of the carbon coating layer with functions of electronic conductivity improvement and ion permeability improvement, the metal Sn with high specific capacity and a one-dimensional nano Li4Ti5O12-TiO2 substrate with small size change in an electrochemical lithium intercalation process, shows excellent electrochemical performances and has a promising application prospect in fields of lithium ion batteries in fast-charge electronic products, electric vehicles and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation and application, in particular to a carbon-coated Li 4 Ti 5 o 12 -TiO 2 / Sn nanocomposites and their preparation and applications. Background technique [0002] With the intensification of the oil crisis and environmental pollution, clean energy has become one of the most important issues in the world. Lithium-ion batteries have been widely used in daily life due to their high energy density and long cycle life. At present, researchers are making continuous efforts to improve the power density, cycle life and safety of lithium-ion batteries to meet the needs of their application in large-scale energy storage devices (especially in the field of pure electric vehicles). [0003] Compared with graphite negative electrodes, when titanium-based materials (including lithium titanate and titanium dioxide) are used as negative electrode materials for lithium-ion batteries, the crysta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/387H01M4/485H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 唐子龙王诗童张中太
Owner TSINGHUA UNIV
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