Nano transition metal-nanometer lithium oxide-porous carbon composite material and preparation method of lithium ion capacitor and lithium ion capacitor

A technology of porous carbon materials and transition metals, applied in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, nanotechnology, etc., can solve problems such as insufficient utilization of metal lithium, difficulty in controlling the amount of compensation, and excessive local lithiation. Achieve the effects of avoiding insufficient utilization or excessive localization, controllable degree of pre-lithiation, and reducing production costs

Active Publication Date: 2019-09-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used pre-lithiation technology in lithium capacitors is mainly the method of spraying lithium powder on the negative electrode. Although this method is relatively simple, it has the disadvantages of insufficient utilization of lithium metal, difficulty in controlling the compensation amount, and excessive local lithiation due to uneven mixing. And other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of lithium ion capacitor, comprising the following steps:

[0026] 1. Preparation of nano-transition metal-nano-lithium oxide-porous carbon composites:

[0027] Under dry conditions, the nano-Mn 2 o 3 , metal lithium powder and porous carbon material are uniformly mixed and then added to the crucible, wherein metal lithium powder and nano-Mn 2 o 3 The molar ratio is 6:1, porous carbon material and Mn 2 o 3 The mass ratio of the porous carbon is 1:1, and the pores with a diameter greater than 20nm in the porous carbon account for 30% of all pores, and then under the condition of argon, the -1 The heating rate of the mixture was heated to 185°C and kept for 2h, then at 1°C·min -1 The cooling rate was lowered to room temperature to obtain a nano-transition metal-nano-lithium oxide-porous carbon composite material. It was determined that the capacity of the nano-transition metal-nano-lithium oxide-porous carbon composite material was 800mAh g -1 ...

Embodiment 2

[0035] A preparation method of lithium ion capacitor, comprising the following steps:

[0036] 1. Preparation of nano-transition metal-nano-lithium oxide-porous carbon composites:

[0037] Under dry conditions, the nano-Fe 3 o 4 , metal lithium powder and porous carbon material are evenly mixed and then added to the crucible, wherein metal lithium powder and nano-Fe 3 o4 The molar ratio is 8:1, porous carbon material and nano-Fe 3 o 4 The mass ratio of the porous carbon is 4:1, and the pores with a diameter greater than 20nm in the porous carbon account for 35% of all pores, and then under the condition of argon, the -1 The heating rate of the mixture was heated to 220°C and kept for 2h, then at 2°C·min -1 The cooling rate was lowered to room temperature to obtain a nano-transition metal-nano-lithium oxide-porous carbon composite material. It was determined that the capacity of the nano-transition metal-nano-lithium oxide-porous carbon composite material was 750mAh g -1 ...

Embodiment 3

[0045] A preparation method of lithium ion capacitor, comprising the following steps:

[0046] 1. Preparation of nano-transition metal-nano-lithium oxide-porous carbon composites:

[0047] Under dry conditions, mix nano-CoO, metal lithium powder and porous carbon material evenly and add them to the crucible, wherein the molar ratio of metal lithium powder to nano-CoO is 2:1, and the mass ratio of porous carbon material to nano-CoO is 2. : 1, and the proportion of pores larger than 20nm in the porous carbon accounted for 40% of all pores, and then under the condition of argon, at 2°C·min -1 The heating rate of the mixture was heated to 200°C and kept for 2h, then at 2°C·min -1 The cooling rate was lowered to room temperature to obtain a nano-transition metal-nano-lithium oxide-porous carbon composite material. It was determined that the capacity of the nano-transition metal-nano-lithium oxide-porous carbon composite material was 600mAh g -1 , the first effect is 4%, and the s...

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Abstract

A fabrication method of a nanometer transition metal-nanometer lithium oxide-porous carbon composite material comprises the following steps of uniformly mixing metal lithium powder, a nanometer metaloxide and a porous carbon material to obtain a mixture; slowly heating the mixture and performing heat preservation in inert atmosphere; and cooling to a room temperature to obtain the nanometer transition metal-nanometer lithium oxide-porous carbon composite material. The invention also provides a fabrication method of a lithium ion capacitor. The nanometer transition metal-nanometer lithium oxide-porous carbon composite material is not severe on environmental requirement, can be used for coating with a positive electrode and is simple to operate, a negative electrode plate is controllable inpre-lithiation degree and obvious in effect, the nanometer transition metal-nanometer lithium oxide-porous carbon composite material can be achieved under an existing lithium battery manufacturing condition, and the production cost can be greatly reduced.

Description

technical field [0001] The invention belongs to the field of energy storage devices, and in particular relates to a capacitor, a preparation method of a nano transition metal-nano lithium oxide-porous carbon composite material and the capacitor. Background technique [0002] Lithium ion capacitor is a new type of energy storage device, which has higher energy density than electric double layer capacitor and higher power density than lithium battery. It has great application potential in emerging energy fields such as wind power, electric vehicles, and industrial equipment for power generation. The biggest feature of lithium-ion capacitors is that through pre-lithiation technology, the potential of the negative electrode is reduced, and the working voltage of the entire device is increased, thereby increasing the energy density. Therefore, pre-lithiation technology is a key technology for the manufacture of lithium-ion capacitors. [0003] At present, the commonly used pre-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/50H01G11/86B82Y30/00
Inventor 郭华军杨哲伟王志兴李新海王接喜彭文杰胡启阳崔立志
Owner CENT SOUTH UNIV
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