Preparation method and application of nickel oxide nanoparticle/carbon nano-helmet composite material
A nanoparticle and composite material technology, used in electrode manufacturing, electrode heat treatment, structural parts, etc., can solve problems such as unfavorable electrolyte fully infiltrating active materials, increasing internal resistance, and unutilized hollow carbon nanoparticles, achieving excellent Effect of rate discharge performance, high electrical conductivity, fast electrochemical reaction rate
Active Publication Date: 2019-10-22
JILIN UNIV
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Problems solved by technology
However, there are still some problems with this structure: (1) the inner wall of the hollow carbon nanoparticles has not been utilized; (2) the contact between the particles can only be NiO-NiO, which increases the internal resistance; (3) the closed space It is not conducive to the electrolyte to fully infiltrate the active material
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[0051] The preparation process and steps in this embodiment are as follows:
[0052] (1) by improving method to synthesize SiO with a diameter of 300nm 2 Nanospheres: Mix 63.3ml of isopropanol with 23.5ml of ultrapure water and 13ml of ammonia water and stir evenly, add 0.6ml of tetraethyl orthosilicate, stir at room temperature for 60 minutes, then add dropwise 5ml of tetraethyl orthosilicate, and stir for 2 hours at 35°C , the product was centrifuged, washed with water and alcohol three times, and vacuum-dried at 70°C for 10 hours;
[0053] (2) by sol-gel method on SiO 2 Sphere surface coated with phenolic resin to obtain RF / SiO 2 Nanosphere: Take 1g SiO 2 Ultrasonic dispersion in 70ml of water and 28ml of ethanol mixture, add 2.3g of cetyltrimethylammonium bromide, 0.35g of resorcinol, 0.11ml of ammonia water and stir at room temperature for 30min, then add 0.5ml of formaldehyde solution, Stir at 35°C for 8h, centrifuge the product, wash it with water and alcohol thre...
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Abstract
The invention relates to a preparation method of a nickel oxide nano-particle / carbon nanometer helmet composite (NiO / CNHs) and application thereof in lithium ion batteries. The preparation method of the composite comprises the following steps: a, preparing SiO2 nanoballs; b, covering the SiO2 balls with a phenolic aldehyde resin coating (RF) to form RF / SiO2; c, preparing Ni(OH)2 on the RF / SiO2 with a hydrothermal method; and d, annealing the prepared Ni(OH)2 / RF / SiO2 at Ar atmosphere to enable the Ni(OH)2 to be converted to NiO and the RF to be carbonized at the same time, and then completely corroding SiO2 with an NaOH solution to obtain the NiO / CNHs. As a negative electrode material of a lithium ion battery, the NiO / CNHs has the capacity reaching up to 1768mAh g<-1> after cycling for 100 cycles under the current density of 0.2Ag<-1>, the capacity reaching up to 424mAh g<-1> after cycling for 1500 cycles under the current density of 5Ag<-1> and the capacity reaching up to 453mAh g<-1> under the current density of 10Ag<-1>. The invention provides a new way for studying the lithium ion batteries with excellent comprehensive properties.
Description
Technical field: [0001] The invention relates to a preparation method of a nickel oxide nanoparticle / carbon nano helmet composite material (NiO / CNHs) and its application as a negative electrode material of a lithium ion battery. Background technique: [0002] Clean and efficient energy storage devices play a vital role in addressing the energy crisis and reducing greenhouse gas emissions. Lithium-ion batteries (LIBs) are currently the first choice, especially for portable electronic devices. The main challenge it faces is to develop electrode materials with high reversible specific capacity, excellent cycle stability and rate performance. As an anode material for commercial lithium-ion batteries, graphite has a very low theoretical capacity of only 372mAh g -1 , which is far from meeting the requirements of large-scale applications, such as new energy vehicles. Recently, transition metal oxides have been considered as a choice as anode materials for LIBs due to their very...
Claims
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IPC IPC(8): H01M4/36H01M4/52H01M4/04
CPCH01M4/0471H01M4/362H01M4/52Y02E60/10
Inventor 杨春成荆文涛李超文子赵明李建忱蒋青
Owner JILIN UNIV