Preparation method and application of self-healing-gel-coated hollow stannic oxide nano microsphere material

A nano-microsphere and self-healing technology, which is applied in the manufacture of hybrid/electric double-layer capacitors, secondary batteries, electrochemical generators, etc., can solve the problems of ineffective volume expansion and easy agglomeration of nanostructures, and achieve Improved self-healing ability, uniform coating, and easy experimental conditions

Active Publication Date: 2016-12-07
北京传奇优声文化传媒有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanostructures have the problem of easy agglomeration, which cannot effectively solve the problem of volume expansion.

Method used

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  • Preparation method and application of self-healing-gel-coated hollow stannic oxide nano microsphere material
  • Preparation method and application of self-healing-gel-coated hollow stannic oxide nano microsphere material
  • Preparation method and application of self-healing-gel-coated hollow stannic oxide nano microsphere material

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] Take 0.1g of polyallylamine hydrochloride and 0.03g of phytic acid aqueous solution and add them in sequence to 10mL of the hollow tin dioxide suspension with a concentration of 20%, and use an ultrasonic machine to sonicate for 20min for thorough mixing. The pH value of the system was adjusted to 6-7 by dilute ammonia water and dilute hydrochloric acid, fully stirred at room temperature for 15 minutes, and the stirred product was left to stand at room temperature for 3 hours. After standing still, put it into a refrigerator to freeze at -20°C, and then use a lyophilizer to lyophilize to obtain phytic acid-crosslinked polyallylamine hydrochloride gel-coated hollow SnO2 nanometer microspheres.

[0030] It can be seen from the charge-discharge cycle test that the hollow SnO coated with 30% phytic acid-crosslinked polyallylamine hydrochloride gel 2 exhibits a relatively hollow SnO 2 High cycle performance of the microspheres, with a capacity of 316mAh g at the 70th cycle ...

example 2

[0032] Take 0.1g of polyallylamine hydrochloride and 0.06g of phytic acid aqueous solution and add them in sequence to 14mL of hollow tin dioxide suspension with a concentration of 25%, and ultrasonically sonicate for 20min for thorough mixing. The pH value of the system was adjusted to 6-7 by dilute ammonia water and dilute hydrochloric acid, fully stirred at room temperature for 20 minutes, and the stirred product was left standing at room temperature for 4 hours. After standing still, put it into a refrigerator to freeze at -20°C, and then use a lyophilizer to lyophilize to obtain phytic acid-crosslinked polyallylamine hydrochloride gel-coated hollow SnO2 nanometer microspheres.

[0033] It can be seen from the charge-discharge cycle test that the hollow SnO coated with 60% phytic acid-crosslinked polyallylamine hydrochloride gel 2 It exhibits high cycle performance, and its capacity after the 100th cycle can be stabilized at 459mAh g-1 . This shows that when the dosage of...

example 3

[0035] Take 0.1g of polyallylamine hydrochloride and 0.09g of phytic acid aqueous solution into 20mL hollow tin dioxide suspension with a concentration of 30% respectively in sequence, and mix thoroughly by ultrasonication for 20min. The pH value of the system was adjusted to 6-7 by dilute ammonia water and dilute hydrochloric acid, fully stirred at room temperature for 30 minutes, and the stirred product was left to stand at room temperature for 6 hours. After standing still, put it into a refrigerator to freeze at -20°C, and then use a lyophilizer to lyophilize to obtain phytic acid-crosslinked polyallylamine hydrochloride gel-coated hollow SnO2 nanometer microspheres.

[0036] It can be seen from the charge-discharge cycle test that the hollow SnO coated with 90% phytic acid cross-linked polyallylamine hydrochloride gel 2 exhibited a capacity of 368mAh g at the 100th cycle -1 . This shows that 90wt% phytic acid-crosslinked PAH gel is less effective in improving the circul...

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Abstract

The invention provides a preparation method and an application of a self-healing-gel-coated hollow stannic oxide nano microsphere material. The preparation method comprises the steps of adding poly allyamine hydrochloride and phytic acid into a hollow SnO<2> suspension liquid at the mass ratio of 10 to 3-9, adjusting the pH value to be neutral, and performing stirring, standing, low-temperature freezing, and carrying out freeze-drying by a freeze dryer to obtain phytic acid-crosslinked poly allyamine hydrochloride gel-coated hollow SnO<2> nano microsphere. By adoption of the method, the severe volume expansion problem of the stannic oxide negative electrode material in a charging-discharging process of the conventional lithium ion battery is effectively relieved, thereby improving cycling stability; and after the nano microsphere material is subjected to cycles of 100 times, the capacity of the nano microsphere material still can be stabilized at 459mAh.g<-1>. The self-healing-gel-coated hollow SnO<2> nano microsphere material has wide application prospect in prolonging the cycle life of the negative electrode material of the lithium ion battery, also can be applied to a supercapacitor and other energy storage equipment at the same time, and can be expected to be applied to a sensor or electronic skin.

Description

technical field [0001] The invention provides a self-healing hollow tin dioxide (SnO2) coated with ion-crosslinked polyallylamine hydrochloride gel. 2 ) Preparation and application of nano-microsphere lithium ion anode materials. Background technique [0002] In the 21st century, with the continuous development of new energy sources, lithium-ion batteries have received scientific attention due to their advantages such as high density, small self-discharge, high charging efficiency, high average output voltage, low cost, no memory, no need to repair, safety and environmental friendliness. Favored by researchers and widely used in power supplies for small portable electronic products such as mobile phones, computers, and cameras. At present, most of the negative electrodes of commercialized lithium-ion batteries are graphene, but the specific capacity is low (372mAhg -1 ), the low initial charge-discharge efficiency limits its application in high-energy-density chemical powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M10/42H01M10/0525H01G11/46H01G11/48H01G11/84
CPCH01G11/46H01G11/48H01G11/84H01M4/366H01M4/483H01M10/0525H01M10/4235Y02E60/10Y02E60/13
Inventor 许鑫华王文静张丽芳马大千
Owner 北京传奇优声文化传媒有限公司
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