Lithium ion capacitor and its preparation method

A lithium-ion and capacitor technology, applied in the field of lithium-ion capacitors, can solve problems such as limiting the application of lithium-ion capacitors, increasing equipment and process costs, and achieving the effects of saving preparation costs, simplifying processes and equipment, and reducing heat treatment energy consumption

Active Publication Date: 2019-03-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the perspective of lithium ion capacitor devices, the cost of positive and negative electrode materials accounts for a large part of the cost of the entire device; due to the different requirements for positive and negative electrode materials, it is often necessary to use different raw materials and processes to prepare positive and negative electrode materials separately, which increases the equipment cost. And the cost of the process greatly limits the application of lithium-ion capacitors in the market

Method used

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  • Lithium ion capacitor and its preparation method
  • Lithium ion capacitor and its preparation method
  • Lithium ion capacitor and its preparation method

Examples

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Embodiment 1

[0040] A lithium ion capacitor of the present invention, the positive electrode material is a porous carbon material, and the negative electrode material is a graphitized carbon material.

[0041] Its preparation method comprises the following steps:

[0042] (1) Preparation of porous carbon materials:

[0043] 1.1, the pore former (ZnCl 2 ) and catalyst (FeCl 3 ) according to the mass ratio of 1:1 mixed to obtain ZnCl 2 / FeCl 3mixture, the ZnCl 2 / FeCl 3 The mixture and the carbon source (chitosan) are mixed in a mass ratio of 0.01:1 to obtain the first mixture.

[0044] 1.2. After grinding the first mixture in step 1.1 with water for 5 minutes, under the protection of inert gas, put it into a tube furnace for heat treatment, specifically: heat up to 110°C at 2°C / min, and heat Insulate for 2 hours; then raise the temperature to 600°C at 2°C / min, and carbonize at 600°C for 2 hours; then raise the temperature to 700°C at 2°C / min, and perform pore-forming treatment at 700...

Embodiment 2

[0054] A lithium ion capacitor of the present invention, the positive electrode material is a porous carbon material, and the negative electrode material is a graphitized carbon material.

[0055] Its preparation method comprises the following steps:

[0056] (1) Preparation of porous carbon materials:

[0057] 1.1, the pore former (SnCl 2 ) and catalyst (NiCl 2 ) according to the mass ratio of 1:1 mixed to obtain SnCl 2 / NiCl 2 mixture, the SnCl 2 / NiCl 2 The mixture is mixed with the carbon source (carboxymethyl chitosan) at a mass ratio of 1:1 to obtain the first mixture.

[0058] 1.2. After grinding the first mixture in step 1.1 with water for 5 minutes, under the protection of inert gas, put it into a tube furnace for heat treatment, specifically: heat up to 110°C at 2°C / min, and heat Insulate for 2 hours; then raise the temperature to 600°C at 2°C / min, and carbonize at 600°C for 2 hours; then raise the temperature to 700°C at 2°C / min, and perform pore-forming trea...

Embodiment 3

[0066] A lithium ion capacitor of the present invention, the positive electrode material is a porous carbon material, and the negative electrode material is a graphitized carbon material.

[0067] Its preparation method comprises the following steps:

[0068] (1) Preparation of porous carbon materials:

[0069] 1.1. Mix the pore forming agent (KOH) and the carbon source (glucose) at a mass ratio of 10:1 to obtain the first mixture.

[0070] 1.2. After grinding the first mixture in step 1.1 with water for 5 minutes, under the protection of inert gas, put it into a tube furnace for heat treatment, specifically: heat up to 110°C at 2°C / min, and heat Insulate for 2 hours; then raise the temperature to 600°C at 2°C / min, and carbonize at 600°C for 2 hours; then raise the temperature to 700°C at 2°C / min, and perform pore-forming treatment at 700°C for 0.5h to obtain the first heat treatment product.

[0071] 1.3. The heat-treated product of step (2) was washed three times with 4 mo...

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Abstract

The invention provides a lithium ion capacitor and a preparation method therefor. The lithium ion capacitor comprises a positive electrode material and a negative electrode material, wherein the positive electrode material is a porous carbon material, and the negative electrode material is a graphitized carbon material. The porous carbon material and the graphitized carbon material take a pore forming agent and / or catalyst and a carbon source as the raw materials, and are prepared through thermal treatment. The preparation method comprises the steps: assembling the negative electrode material and a lithium piece into a semi-battery, performing the circulation for three times under the condition of a 50 mA / g current, and carrying out the discharging till the voltage is 0.01V; disassembling the semi-battery to obtain a graphitized carbon negative electrode piece, in which lithium is embedded in advance; enabling the negative electrode piece with the lithium and the porous carbon positive electrode material to respectively serve as the negative electrode and the positive electrode of the lithium ion capacitor, and carrying out the assembling with electrolyte and a diaphragm to form the lithium ion capacitor. According to the invention, the positive electrode material is large in capacity, and the negative electrode material has a certain voltage platform, is large in capacity, is better in multiplying performance, and enables the performance of the capacitor to be excellent.

Description

technical field [0001] The invention relates to the technical field of lithium ion capacitors, in particular to a lithium ion capacitor and a preparation method thereof. Background technique [0002] In recent years, clean energy for electric vehicles (EVs) or hybrid electric vehicles (HEVs) that combine internal combustion engines and electric motors has been rapidly developed. However, compared with ordinary electronic devices, energy storage devices for vehicles have stricter conditions of use, requiring not only high energy density, but also higher cycle life and rate performance. Although lithium-ion batteries have high energy density, there are still problems in safety, cycle life and rate performance. Although supercapacitors have high power density, their energy density is low, which makes it difficult to meet the further requirements of electric vehicles for cruising range. Lithium-ion capacitors take into account the high energy density of lithium-ion batteries, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/06H01G11/50H01G11/34H01G11/24H01G11/84H01G11/86C01B32/05C01B32/20
CPCY02E60/13
Inventor 王接喜颜志梁郭华军彭文杰杨哲伟李新海王志兴胡启阳
Owner CENT SOUTH UNIV
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