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High-voltage hybrid lithium ion supercapacitor and preparation method thereof

A supercapacitor, high-voltage technology, applied in hybrid capacitors, hybrid/electric double-layer capacitor manufacturing, hybrid capacitor electrodes, etc., can solve the problem of low working voltage energy density and power density of capacitors, which limit the practical application of hybrid lithium-ion supercapacitors , poor rate performance of LNMO and activated carbon materials, etc., to achieve the effect of improving conductivity and rate performance, low cost, and high working voltage

Pending Publication Date: 2022-07-12
昆明云大新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor rate capability of conventional LNMO and activated carbon materials used in these studies, the power performance of the resulting capacitors is poor.
On the other hand, due to the fact that the conventional carbonate-based electrolytes used are prone to electrochemical decomposition when the voltage is higher than 4.4V, and these electrolytes lack proper protective agents to protect the LNMO from working normally at high voltages, resulting in poor performance of the obtained capacitors. The working voltage, energy density and power density are still low, and the cycle life is short, which limits the practical application of LNMO-based hybrid lithium-ion supercapacitors

Method used

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  • High-voltage hybrid lithium ion supercapacitor and preparation method thereof
  • High-voltage hybrid lithium ion supercapacitor and preparation method thereof
  • High-voltage hybrid lithium ion supercapacitor and preparation method thereof

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preparation example Construction

[0054] The preparation method of the high-voltage hybrid lithium-ion supercapacitor of the present invention includes the steps of high-voltage electrolyte preparation, positive electrode sheet preparation, negative electrode sheet preparation, and packaging, and the specific steps are as follows:

[0055] A. Preparation of high-voltage electrolyte: Under the condition of inert gas atmosphere with controlled oxygen <1ppm and moisture <1ppm, according to a certain mass ratio, the selected organic solvent, lithium salt and additives are mixed uniformly to prepare a high-voltage electrolyte;

[0056] B. Preparation of positive electrode sheet: According to a certain mass ratio, add 5V positive electrode material, nano-carbon material, conductive agent and binder into N-methylpyrrolidone, and form a positive electrode slurry after vacuum high-speed stirring, and then mix the positive electrode slurry It is evenly coated on the surface of the current collector, and the positive elec...

Embodiment 1

[0073] Preparation and testing of the high-voltage electrolyte of the high-voltage hybrid lithium-ion supercapacitor of the present invention.

[0074] (1) Contains 1molL -1 LiPF 6 Preparation of EC:DMC:EMC(1:1:1) High Voltage Electrolyte with 0.2%TPPi

[0075] In a glove box where oxygen (6 ) and the additive triphenyl phosphite (TPPi) were added to the obtained mixed solvent, dissolved and stirred evenly, and then a certain amount of molecular sieve was added. -1 LiPF 6 And 0.2%TPPi high voltage electrolyte.

[0076] (2) Test of electrolyte

[0077] The glassy carbon electrode was used as the working electrode, the lithium sheet was used as the reference electrode, and the platinum mesh was used as the counter electrode. -1 The above-mentioned high-voltage electrolyte was tested by cyclic voltammetry at the scanning speed (as shown in the appendix). figure 1 The test results show that the oxidative decomposition of the solvent in the electrolyte occurs at a higher pot...

Embodiment 2

[0079] Preparation and testing of the positive electrode sheet of the high-voltage hybrid lithium-ion supercapacitor of the present invention.

[0080] 1. Preparation of cathode sheets for high-voltage hybrid lithium-ion supercapacitors

[0081] (1) Preparation of LNMO / SP / KS / PVDF (80 / 5 / 5 / 10) pole pieces

[0082] Step 1: Accurately weigh a certain mass of polyvinylidene fluoride (PVDF) powder into the vacuum stirring tank, and then add a certain mass of N-methylpyrrolidone (NMP) (the mass ratio of PVDF:NMP is 1:20), Set the speed of the vacuum mixer to 500 r / min, and stir at room temperature for 60 min to obtain a mixed solution of PVDF and NMP; add a certain mass of 5V cathode material LiNi 0.5 Mn 1.5 O 4 (LNMO), stirred for 90 min to obtain a mixed slurry of LNMO, PVDF and NMP; respectively added a certain mass of conductive carbon black (SP) and conductive graphite (KS), and stirred for 60 min to obtain the above LNMO / SP with uniform dispersion. Cathode material electrod...

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Abstract

The invention discloses a high-voltage hybrid lithium ion supercapacitor and a preparation method thereof. The high-voltage hybrid lithium ion supercapacitor comprises a positive plate, a negative plate, a diaphragm between the positive electrode and the negative electrode, electrolyte filled in gaps between the positive electrode, the negative electrode and the diaphragm, and a shell, and the positive plate and / or the negative plate are / is composed of a current collector and an electrode material which is coated on the surface of the current collector and comprises a nano carbon material. The electrolyte is a high-voltage electrolyte formed by mixing an organic solvent, a lithium salt and an additive. The preparation method of the high-voltage hybrid lithium ion supercapacitor comprises the steps of high-voltage electrolyte preparation, positive plate preparation, negative plate preparation and packaging. According to the invention, the nanocarbon material is introduced to carry out composite modification on the 5V positive electrode material and the porous carbon material, and by optimizing the electrolyte and optimizing the capacity ratio of the positive electrode to the negative electrode of the capacitor, the capacitor provided by the invention has relatively high working voltage, energy density, power density, safety and cycle service life.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage, and in particular relates to a high-voltage hybrid lithium-ion supercapacitor with higher operating voltage, energy density, power density, safety and cycle life and a preparation method thereof. Background technique [0002] Since the 20th century, the economy has developed rapidly, resources are on the verge of depletion, and pollution has become increasingly serious. It is urgent to find new renewable energy sources that can replace fossil fuels such as oil, coal, and natural gas. At the same time, the rapid development of new energy technologies has brought an urgent need for new energy storage technologies. [0003] Supercapacitors (also known as electrochemical capacitors) are a new type of energy storage element developed at home and abroad in recent decades, which is between conventional capacitors and chemical batteries. Due to its high power density (10 3 ~10 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/36H01G11/58H01G11/62H01G11/64H01G11/78H01G11/84
CPCH01G11/36H01G11/62H01G11/64H01G11/84H01G11/24H01G11/58H01G11/78Y02E60/13
Inventor 卢文杨晓萍成方
Owner 昆明云大新能源有限公司