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Lithium ion hybrid capacitor negative electrode material with core-shell structure and preparation and application thereof

A hybrid capacitor and negative electrode material technology, applied in the field of materials science, can solve problems such as unstable solid electrolyte membrane, slow Faraday reaction, poor cycle stability, etc., to enhance electrolyte wettability and electronic conductivity, and compensate kinetic imbalance , the effect of increasing the power density

Inactive Publication Date: 2020-06-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the anode materials studied so far have many problems in the actual process, mainly including: (1) The cycle stability is poor. During the charge-discharge cycle, the volume expansion of the anode material will cause click pulverization, Rapid capacity decay; (2) formation of an unstable solid-state electrolyte film (SEI) on the electrode surface; (3) kinetic imbalance between the slow faradaic reaction in the battery cathode and the fast non-faradaic adsorption / desorption process in the capacitor anode and other shortcomings, which limit its large-scale use

Method used

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  • Lithium ion hybrid capacitor negative electrode material with core-shell structure and preparation and application thereof
  • Lithium ion hybrid capacitor negative electrode material with core-shell structure and preparation and application thereof
  • Lithium ion hybrid capacitor negative electrode material with core-shell structure and preparation and application thereof

Examples

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Embodiment 1

[0034] A lithium-ion hybrid capacitor negative electrode material with a core-shell structure, comprising the steps of:

[0035] (1) Preparation of ZIF-8: at room temperature, 3mmol Zn(NO 3 ) 2 ·6H 2O was dissolved in 100mL methanol to obtain A solution, then 3mmol 2-methylimidazole was dissolved in 100mL methanol solution to form solution B, and then B solution was quickly added to A solution and stirred for 5min and allowed to stand for 12h, then centrifugally dried with methanol to obtain ZIF -8;

[0036] (2) Synthesis of ZIF-67@ZIF-8: Disperse 200 mg of ZIF-8 obtained in step (1) in 60 mL of methanol, then add 10 mg of cetyltrimethylammonium bromide and 200 mg of Co(NO 3 ) 2 ·6H 2 O to form solution C, then dissolve 900mg of 2-methylimidazole in 60mL methanol solution to form solution D, then quickly add solution C to solution D and stir for 5min, then perform hydrothermal reaction at 90°C for 6h, and finally centrifuge and dry to obtain ZIF-67@ZIF-8;

[0037] (3) P...

Embodiment 2

[0041] A preparation method of a lithium-ion hybrid capacitor negative electrode material with a core-shell structure, comprising the steps of:

[0042] (1) Preparation of ZIF-8: at room temperature, 6mmol Zn(NO 3 ) 2 ·6H 2 O was dissolved in 200mL methanol to obtain solution A, then 12mmol 2-methylimidazole was dissolved in 200mL methanol solution to form solution B, then solution B was quickly added to solution A and stirred for 10min and allowed to stand for 24h, then centrifugally dried with methanol to obtain ZIF -8;

[0043] (2) Synthesis of ZIF-67@ZIF-8: Disperse 400 mg of ZIF-8 obtained in step (1) in 90 mL of methanol, then add 20 mg of cetyltrimethylammonium bromide and 600 mg of Co(NO 3 ) 2 ·6H 2 O to form solution C, then dissolve 2400mg 2-methylimidazole in 90mL methanol solution to form solution D, then quickly add solution C to solution D and stir for 5min, then perform hydrothermal reaction at 120°C for 12h, and finally centrifuge and dry to obtain ZIF-67...

Embodiment 3

[0048] A preparation method of a lithium-ion hybrid capacitor negative electrode material with a core-shell structure, comprising the steps of:

[0049] (1) Preparation of ZIF-8: at room temperature, 6mmol Zn(NO 3 ) 2 ·6H 2 O was dissolved in 200mL methanol to obtain solution A, then 18mmol 2-methylimidazole was dissolved in 200mL methanol solution to form solution B, then solution B was quickly added to solution A and stirred for 20min and allowed to stand for 36h, then centrifugally dried with methanol to obtain ZIF -8;

[0050] (2) Synthesis of ZIF-67@ZIF-8: Disperse 300 mg of ZIF-8 obtained in step (1) in 120 mL of methanol, then add 10 mg of cetyltrimethylammonium bromide and 500 mg of Co(NO 3 ) 2 ·6H 2 O to form solution C, then dissolve 1200mg 2-methylimidazole in 120mL methanol solution to form solution D, then quickly add solution C to solution D and stir for 5min, then perform hydrothermal reaction at 180°C for 24h, and finally centrifuge and dry to obtain ZIF-...

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Abstract

The invention provides a lithium ion hybrid capacitor negative electrode material with a core-shell structure and preparation and application thereof. The lithium ion hybrid capacitor negative electrode material with the core-shell structure has a unique nitrogen-doped bimetallic selenide with the core-shell structure; due to the porous structure, the contact area between the material and electrolyte is increased, which facilitates fast transmission of electrons. According to the preparation method, 2-methylimidazole and Zn (NO3) 2.6 H2O are taken as raw materials; ZIF-8 is obtained through astanding method; then ZIF-8 is taken as a template; 2-methylimidazole and Co (NO3) 2.6 H2O are taken as raw materials, and ZIF-67 @ ZIF-8 is obtained through a hydrothermal method; then, dopamine isused as a carbon and nitrogen source to be compounded with ZIF-67 @ ZIF-8; and then the mixture is mixed with Se powder to be subjected to a thermal reaction to obtain the negative electrode material.The negative electrode material is applied to a lithium ion battery, is assembled into a lithium ion hybrid capacitor, and has a good application prospect in electrochemistry.

Description

technical field [0001] The invention belongs to the technical field of materials science, and in particular relates to a negative electrode material of a lithium-ion hybrid capacitor with a core-shell structure and its preparation and application. Background technique [0002] With high energy density, power density, and long cycle life, electrical energy storage systems (EES) play a vital role in mobile electronics, electric vehicles, and hybrid vehicles, so the development of advanced EESs is urgently needed. Lithium-ion batteries (LIBs) and supercapacitors (SCs) are two major types of reversible electrochemical energy storage devices. High energy density of LIB (>250Wh kg -1 ), but its fatal disadvantages are poor cycle performance and low power density. On the contrary, SCs have excellent cycling performance and good power density, but their energy density (<10Wh kg -1 ) are relatively poor, so their applications are also limited. These performance differences ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/26H01G11/50H01G11/86
CPCH01G11/26H01G11/50H01G11/86Y02E60/13
Inventor 陈坚陈达明王维娟
Owner SOUTHEAST UNIV
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