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Hydrogen lithium titanate Li-H-Ti-O material and preparation method thereof

A technology of lithium hydrogen titanate and lithium hydrogen acid, applied in chemical instruments and methods, nanotechnology for materials and surface science, titanium compounds, etc., can solve problems such as unreported research, and achieve cheap and easy-to-obtain raw materials, The effect of mild and controllable preparation process and excellent cycle stability

Inactive Publication Date: 2015-09-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the construction of lithium hydrogen titanate Li-H-Ti-O composite system materials at the micro-nano scale based on the low-temperature dehydration in-situ self-growth model.

Method used

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  • Hydrogen lithium titanate Li-H-Ti-O material and preparation method thereof
  • Hydrogen lithium titanate Li-H-Ti-O material and preparation method thereof
  • Hydrogen lithium titanate Li-H-Ti-O material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0057] The preparation process of titanic acid nanopowder is as follows: 2.5g TiO 2 Mix with 80mL of NaOH solution with a concentration of 10mol / L, stir for 4h, then carry out hydrothermal reaction for 48h, and the hydrothermal temperature is 100°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 suction filtration, the product was dried at 60° C. to obtain white fluffy titanic acid nanopowder.

Embodiment 2

[0059] The preparation process of titanate nanopowder is as follows: 6.5g TiO 2 Mix it with 80mL of NaOH solution with a concentration of 12mol / L, stir for 3h, then carry out hydrothermal reaction for 24h, and the hydrothermal temperature is 150°C. After the reaction, the product was added to excess dilute hydrochloric acid with a concentration of 0.4 mol / L and stirred for 8 hours. After suction filtration, the product was dried at 60° C. to obtain white fluffy titanic acid nanopowder.

Embodiment 3

[0061] The preparation process of titanic acid nanopowder is as follows: 9.5g TiO 2 Mix it with 80mL of NaOH solution with a concentration of 15mol / L, stir for 5h, 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 0.8 mol / L and stirred for 24 hours. After suction filtration, the product was dried at 60° C. to obtain white fluffy titanic acid nanopowder.

[0062] Preparation of lithium hydrogen titanate LHTO-NP material

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Abstract

The invention belongs to the technical field of energy nano-material preparation method, and especially relates to a hydrogen lithium titanate Li-H-Ti-O material and a preparation method thereof. According to the invention, a titanium compound is taken as a raw material, titanic acid nano powder prepared by a highly basic hydrothermal method and a soluble lithium salt aqueous solution are subjected to hydro-thermal ion exchange, a hydrogen lithium titanate LHTO-NP material is obtained by a low-temperature heat treatment process, Li4Ti5O12 and TiO2 enable in-situ growth on LHTO-NP by employing a low temperature dehydration and phase transition method to obtain a series of hydrogen lithium titanate LHTO-CP material with uniformly distributed Li4Ti5O12 and TiO2 nano structure on the LHTO-NP nano sheet. The hydrogen lithium titanate LHTO-CP material presents excellent rate capacity and cycle stabilization performance, the preparation process is mild and controllable, and middle and high temperature heat treatment processes in Li4Ti5O12 and TiO2 preparation method can be omitted. The method has the advantages of easily available raw material with low cost and high yield, large scale industrial production is easily realized, and the method has wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of energy nanometer materials, and in particular relates to a lithium hydrogen titanate Li-H-Ti-O material and a preparation method thereof. Background technique [0002] Today, with the global oil crisis and the intensification of environmental pollution and the popularity of portable electronic products, people's demand for pure electric vehicles and fast-charging electronic devices is increasing day by day. Fast charging and discharging, ultra-long life and high safety use conditions have put forward higher requirements for lithium-ion batteries or capacitors in electric vehicles and electronic products. [0003] As an anode material for lithium-ion batteries, due to the Li-Ti-O system (including lithium titanate and titanium dioxide) compared with graphite anodes, it has small crystal volume changes during the lithiation process, excellent large-rate specific capacity and cycle sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485B82Y30/00B82Y40/00C01G23/00
CPCB82Y30/00B82Y40/00C01G23/00C01P2004/64H01M4/485H01M10/0525H01G11/50H01G11/86Y02E60/10
Inventor 唐子龙王诗童张中太
Owner TSINGHUA UNIV
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