Hierarchical structure microsphere and preparation method and application thereof

A hierarchical structure, micro-sphere technology, applied in structural parts, nanotechnology, nanotechnology, etc., can solve the problems of low cycle stability, low coulombic efficiency, low conductivity, particle agglomeration, etc., to improve electrical conductivity and lithium ion diffusion. efficiency, improved reversibility, and the effect of inhibiting particle agglomeration

Pending Publication Date: 2022-08-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrochemical reaction mechanism of tin oxide is a two-step reaction of conversion and alloying, but its low conductivity and particle agglomeration lead to low cycle stability and coulombic efficiency.

Method used

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  • Hierarchical structure microsphere and preparation method and application thereof
  • Hierarchical structure microsphere and preparation method and application thereof
  • Hierarchical structure microsphere and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of preparation of carbon-coated tin oxide and titania particles graded microspheres, the specific method is as follows:

[0036] The first step, 2.54g tin tetrachloride pentahydrate (SnCl 4 ·5H 2 0) was dissolved in 200ml of deionized water under stirring; in the second step, 10ml of ammonia (NH 3 ·H 2 O, 28%) was added dropwise to the above solution, stirred for 10 min to completely dissolve the resulting precipitate; in the third step, 1.3 g of sodium borohydride (NaBH 4 ) powder was added to the above solution, vigorously stirred for 30min until the colorless solution became a brown-black suspension; the fourth step, 1.6ml of tetrabutyl titanate was dispersed in 10ml of absolute ethanol, then, the above suspension was added dropwise In the liquid, stir for 10min; the fifth step, add 0.6g polyvinylpyrrolidone (molecular weight is 360,000) to the above-mentioned suspension, stir for 20min; the sixth step, carry out spray drying and granulation to the suspensi...

Embodiment 2

[0039] The preparation of a carbon-coated tin oxide and titania particle graded microspheres is similar to the steps in Example 1, using sucrose instead of polyvinylpyrrolidone as the carbon precursor, and the specific method is as follows:

[0040] The first step, 2.54g tin tetrachloride pentahydrate (SnCl 4 ·5H 2 0) was dissolved in 200ml of deionized water under stirring; in the second step, 10ml of ammonia (NH 3 ·H 2 O, 28%) was added dropwise to the above solution, stirred for 10 min to completely dissolve the resulting precipitate; in the third step, 1.3 g of sodium borohydride (NaBH 4) powder was added to the above solution, vigorously stirred for 30min to obtain a brown-black suspension; the fourth step, 1.6ml of tetrabutyl titanate was dispersed in 10ml of absolute ethanol, then, added dropwise to the above suspension, stirred for 10min The 5th step, joins 0.93g sucrose in the above-mentioned suspension, stirs 20min; The 6th step, carries out spray drying granulati...

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Abstract

The invention discloses a micro-sphere with a hierarchical structure as well as a preparation method and application of the micro-sphere. The micro-sphere material is composed of three components, namely tin oxide nano-particles, titanium dioxide nano-particles and a carbon micro-sphere substrate, and the tin oxide nano-particles and the titanium dioxide nano-particles are uniformly dispersed in the carbon substrate. Oxide particles are prepared by adopting a wet chemical method, then a carbon source is added, precursor microspheres are obtained through spray drying granulation, and a target product is obtained through high-temperature pyrolysis. The carbon-coated tin oxide and titanium dioxide microspheres can be used as a negative electrode of a lithium ion battery, the ultrafine particles are beneficial to rapid diffusion of lithium ions, and the titanium dioxide particles and the carbon substrate can effectively inhibit diffusion and agglomeration of the tin oxide and intermediate products and products in the charging and discharging process. When the material is used as a negative electrode of a lithium ion battery, the material has long cycle stability, excellent rate capability and relatively high first coulombic efficiency.

Description

technical field [0001] The invention relates to the field of preparation of negative electrode materials for lithium ion batteries, in particular to a method for preparing graded microspheres formed by dispersing tin oxide and titanium dioxide particles on a carbon substrate, and its application as a negative electrode for lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles, energy storage, electronic equipment and other fields due to their advantages of high energy density, long cycle life, high open circuit voltage, no memory effect and environmental protection. With the development of industrialization, people have put forward higher and higher requirements for the performance of lithium-ion batteries. The negative electrode is one of the most critical components affecting the performance of lithium-ion batteries, and the research on negative electrode materials has important scientific and social value. [0003...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M4/48H01M4/04H01M10/0525B82Y40/00B82Y30/00
CPCH01M4/366H01M4/62H01M4/625H01M4/483H01M4/0471H01M10/0525B82Y40/00B82Y30/00H01M2004/027H01M2004/021Y02E60/10
Inventor 韩伟强应杭君
Owner ZHEJIANG UNIV
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