Nanosheet-shaped lithium titanate material with oriented structure and preparation method and application thereof

A flake lithium titanate, orientation technology, applied in titanate, structural parts, alkali metal titanate and other directions, can solve the problems of electrochemical side reactions, limit the inherent advantages of lithium titanate materials, and achieve good safety , Improve fast charge and discharge capacity, solve the effect of low ion mobility

Active Publication Date: 2020-11-20
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these methods can fundamentally solve the intrinsic ion diffusion problem of lithium titanate, and some even cause electrochemical side reactions, which limits the inherent advantages of lithium titanate materials.

Method used

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  • Nanosheet-shaped lithium titanate material with oriented structure and preparation method and application thereof
  • Nanosheet-shaped lithium titanate material with oriented structure and preparation method and application thereof
  • Nanosheet-shaped lithium titanate material with oriented structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation of nano flake lithium titanate material, the steps are as follows:

[0029] (1) Measure 0.5mL TiCl with a pipette gun 4 solution and slowly added to 20mL of ethylene glycol, fully stirred at room temperature, then added 2mL of tetraalkylammonium hydroxide aqueous solution (mass fraction is 25%), after stirring for 20min, the mixture was transferred to a polytetrafluoroethylene reactor , hydrothermally reacted at 150°C for 24 hours, washed the product with deionized water and ethanol respectively after the reaction, and dried at 60°C for later use;

[0030] (2) Weigh 30mg of the product obtained in step (1), add it to 15mL lithium hydroxide solution (1mol / L), transfer it to a polytetrafluoroethylene reactor after fully stirring, and conduct a hydrothermal reaction at 140°C for 1h, and the reaction is complete Afterwards, the product is washed by the method of step (1) and dried;

[0031] (3) Transfer the dried product of step (2) to a crucible, and calc...

Embodiment 2

[0033] The difference between the method for preparing nano-flaky lithium titanate material in this example and Example 1 is that the hydrothermal reaction solvent used in step (1) of this example is propylene glycol, and the temperature of the hydrothermal reaction is 140°C. The calcining temperature in step (3) is 600°C.

Embodiment 3

[0035] The difference between the method for preparing the nanosheet-shaped lithium titanate material in this example and Example 1 is that the temperature of the hydrothermal reaction used in step (1) of this example is 130° C., and the reaction time is 12 hours. The calcination temperature in step (3) is 700° C., and the calcination time is 1 h.

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Abstract

The invention discloses a preparation method of a nanosheet-shaped lithium titanate material with an oriented structure, which comprises the following steps: adding a titanium source into a reaction solvent, uniformly stirring, adding an alkyl ammonium hydroxide water solution, carrying out hydrothermal reaction to obtain a precursor A, adding the precursor A into a lithium hydroxide solution, carrying out hydrothermal reaction to synthesize a precursor B, and calcining the precursor B to obtain the lithium titanate nanosheet with the oriented structure. The prepared lithium titanate materialhas an orientation structure channel beneficial to lithium ion migration, lithium ions migrate along the orientation channel, energy consumption can be reduced, meanwhile, the lithium titanate material is of a nano-sheet structure, and the diffusion distance of the lithium ions can be effectively shortened through the two-dimensional sheet nano-structure. Therefore, rapid migration of ions can bepromoted, the rapid charging and discharging capacity of the material can be improved, the material can be used as a lithium ion battery negative electrode material to be applied to a power type powerbattery, and the bottleneck problem of low ion mobility of an existing lithium titanate material is solved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a nano-flaky lithium titanate material with an orientation structure and a preparation method and application thereof. Background technique [0002] At present, promoting and developing energy-saving and environment-friendly new energy vehicles is an important measure to solve energy and environmental problems. One of the keys to the development of new energy vehicles is to develop new and efficient battery materials and key technologies. Lithium-ion batteries are currently the most promising power batteries due to their long cycle life, environmental friendliness, and good energy density and power density. However, there are still many deficiencies and challenges in lithium-ion power batteries at this stage, such as poor safety, difficulty in fast charging and discharging, short cruising range, and high cost, making it difficult to meet the development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00H01M4/485H01M10/0525
CPCC01G23/005H01M4/485H01M10/0525H01M2004/021H01M2004/027C01P2002/72C01P2004/04C01P2004/62C01P2004/64Y02E60/10
Inventor 吴明娒符舒婷童圣富
Owner SUN YAT SEN UNIV
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