Lithium niobite/niobium-base oxide/silicon compound cathode material, preparation method and application thereof

A negative electrode material and oxide technology, which is applied in the field of lithium niobate/niobium-based oxide/silicon composite negative electrode system and its preparation, can solve the problems of unstable ion transport and poor ion conductivity, and achieve good electrochemical cycle stability , the preparation method is simple, the effect of high batch stability

Active Publication Date: 2018-11-27
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose and task of the present invention is to overcome the problems of poor ionic conductivity of the oxide coating layer in the prior art and unstable ion transport at high temperatures, and provide a lithium niobate / niobium-based oxide with good lithium ion conductivity. Lithium niobate / silicon composite negative electrode material and its preparation and application, using high-temperature solid-state reaction or high-speed ball milling, in-situ synthesis of lithium niobate between lithium nitride and niobium-based oxides, and preparation of lithium niobate / niobium-based oxides Silicon-based composite anode system with mixed shell

Method used

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  • Lithium niobite/niobium-base oxide/silicon compound cathode material, preparation method and application thereof
  • Lithium niobite/niobium-base oxide/silicon compound cathode material, preparation method and application thereof
  • Lithium niobite/niobium-base oxide/silicon compound cathode material, preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0048] A preparation method with lithium niobate / niobium-based oxide / silicon composite negative electrode material has the following steps:

[0049] S1. Add 0.538g of silicon powder (average particle size of 50nm) into 40mL of ethanol solution (analytical grade) and ultrasonically vibrate for 30 minutes to obtain a uniformly mixed silicon powder / alcohol solution: silicon powder / ethanol solution;

[0050] S2. Dissolve 0.538g of niobium chloride in 40ml of ethanol solution and vigorously stir for 30min to obtain a uniform oxide precursor / alcohol solution: clear ethanol solution of niobium chloride;

[0051] S3, adding the silicon powder / alcohol solution obtained in step S1 to the niobium chloride ethanol solution obtained in step S2 and vigorously stirring for 30min to obtain the ethanol mixed solution of 80mL silicon powder-niobium chloride, Nb in the solution 5+ The molar concentration is 0.0250mol L -1 ;

[0052] S4, move the 80mL silicon powder-niobium chloride ethanol mix...

Embodiment 2

[0058] A preparation method with lithium niobate / niobium-based oxide / silicon composite negative electrode material has the following steps:

[0059] S1. Add 0.863g of silicon powder (average particle size of 50nm) into 30mL of ethylene glycol solution (analytical pure) and ultrasonically vibrate for 40min to obtain a uniformly dispersed silicon powder / ethylene glycol solution;

[0060] S2, 0.807g niobium oxalate was dissolved in 30ml of ethylene glycol solution and vigorously stirred for 40min to obtain a clear niobium oxalate ethylene glycol solution for subsequent use;

[0061] S3, adding the silicon powder / ethylene glycol solution obtained in step S1 to the niobium oxalate ethylene glycol solution obtained in step S2 and vigorously stirring for 40min to obtain the ethylene glycol mixed solution of 60mL silicon-niobium oxalate, Nb in the solution 5+ The molar concentration is 0.0250mol L -1 ;

[0062] S4. Move the ethylene glycol mixed solution of silicon-niobium oxalate p...

Embodiment 3

[0067] A preparation method with lithium niobate / niobium-based oxide / silicon composite negative electrode material has the following steps:

[0068] S1. Add 0.538g of silicon powder (average particle size of 50nm) into 40mL of methanol solution (analytical pure) and ultrasonically vibrate for 30min to obtain a uniformly dispersed silicon powder / methanol solution;

[0069] S2, 0.538g of niobium chloride and 0.340g of tetrabutyl titanate were successively dissolved in 40ml of methanol solution and vigorously stirred for 1h to obtain a clear mixed solution of niobium chloride / tetrabutyl titanate in methanol;

[0070] S3. Add the silicon powder / methanol solution obtained in step S1 to the mixed solution prepared in step S2 and stir vigorously for 40 minutes to obtain 80 mL of methanol mixed solution of silicon-niobium chloride / tetrabutyl titanate. In the solution, Nb 5+ The molar concentration is 0.0250molL -1 , Ti 3+ The molar concentration is 0.0125mol L -1 ;

[0071]S4. Mov...

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Abstract

The invention discloses a lithium niobite/niobium-base oxide/silicon compound cathode material, a preparation method and an application thereof. The lithium niobite/niobium-base oxide/silicon compoundcathode material comprises a silicon active center and a lithium niobite/niobium-base oxide mixed shell layer uniformly coated on the surface of the silicon active center. The lithium niobite/niobium-base oxide/silicon compound cathode material provided by the invention takes lithium niobite as a fast ion conductor, so that the rapid transferring of lithium ions under room temperature and even high temperature can be effectively guaranteed; the synergic alloying effect of the lithium niobite and the niobium-base oxide is beneficial to the structure and surface stability of the silicon duringan electrochemical reaction process, so that the lithium niobite/niobium-base oxide mixed shell layer can be used as a stress buffer layer, an ionic conduction layer and a surface stabilizing layer; the lithium niobite/niobium-base oxide/silicon compound cathode material has high initial coulombic efficiency and excellent electrochemical circling stability performance.

Description

technical field [0001] The invention relates to a lithium niobate / niobium-based oxide / silicon composite negative electrode material and its preparation and application, in particular to a lithium niobate / The invention relates to a niobium-based oxide / silicon composite negative electrode system and a preparation method and application thereof, belonging to the field of lithium ion batteries. Background technique [0002] Since the beginning of the 21st century, energy and environmental problems have become increasingly severe, and countries all over the world have invested scientific and technological strength and funds in the development of green energy. As an emerging energy material, lithium-ion batteries have the characteristics of high energy density, long life and no pollution to the environment, and are widely used in energy supply systems for mobile terminals and transportation tools. The negative electrode material is one of the keys to determine the overall perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/62H01M10/0525Y02E60/10
Inventor 文钟晟王冠琴尹金鹏崔立英李嵩孙俊才季世军
Owner DALIAN MARITIME UNIVERSITY
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