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Method for preparing lithium-replenishing material Li2NiO2, and lithium ion capacitor using Li2NiO2

A technology for capacitors and lithium ions, which is applied in the preparation of lithium-supplementing materials Li2NiO2 and the field of lithium-ion capacitors using the Li2NiO2, which can solve the problems of high production cost of porous foil materials, weakened capacitor power characteristics, and hidden dangers of lithium metal safety.

Inactive Publication Date: 2018-11-02
浙江微创新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium metal supplementation is a lithium supplementation method that has high requirements on the environment, and lithium metal residues may pose a great safety hazard. This lithium supplementation method involves the use of porous foil materials. The production cost of porous foil materials is relatively high, and the manufacturing technology is mainly Concentrated in Japan's Hitachi Chemical, Nippon Metal Industries, etc. At the same time, in the production process, the pre-embedded lithium takes a long time, which is a disadvantageous factor for mass production
The second is to use a high-concentration electrolyte for lithium supplementation, and apply intermittent current pulses to charge the capacitor. The lithium ions in the electrolyte are inserted into the negative electrode to complete the pre-intercalation of lithium. However, this method will consume lithium ions in the electrolyte and weaken the capacitor. power characteristics

Method used

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  • Method for preparing lithium-replenishing material Li2NiO2, and lithium ion capacitor using Li2NiO2
  • Method for preparing lithium-replenishing material Li2NiO2, and lithium ion capacitor using Li2NiO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Will Li 2 O, NiO according to the molar ratio of 1:1, in N 2 Under the protection of ball milling for 12h, before sintering, pass N into the furnace 2 20min, remove the oxygen in the furnace, heat up to 600°C at a heating rate of 10°C / min, and sinter for 10h, take it out, grind it, and get Li 2 NiO 2 Crude product, take Li 2 NiO 2 Crude product mass 3% Al 2 o 3 with Li 2 NiO 2 The crude product was ball milled for 5 hours, the temperature was raised to 600°C at a heating rate of 10°C / min, and the sintering time was 10h to obtain the lithium-replenishing material Li 2 NiO 2 ,spare. The lithium supplement material Li 2 NiO 2 The XRD pattern (X-ray diffraction pattern) see figure 1 .

Embodiment 2

[0036] The making of positive electrode sheet: activated carbon, Li 2 NiO 2, SP, and PVDF are proportioned according to the mass ratio of 80%: 10%: 5%: 5%. PVDF is first dissolved in NMP to obtain a glue solution with a mass concentration of 10%. After mixing and stirring the above substances, add them slowly while stirring in a vacuum environment NMP, slowly adjust the viscosity and solid content of the slurry to make it suitable for coating, stir for 2 hours to obtain the positive electrode slurry, coat the positive electrode slurry on the aluminum foil current collector with a thickness of 20 μm, and vacuum bake it at 150 ° C for 12 hours to carry out molding Cut to get the positive plate of lithium ion capacitor.

[0037] Production of the negative electrode sheet: mix hard carbon, SP, SBR, and CMC according to the mass ratio of 92%: 3%: 2.5%: 2.5%, use DMF as the solvent to obtain the negative electrode slurry, and apply the negative electrode slurry Coated on a copper ...

Embodiment 3

[0042] The making of positive electrode sheet: activated carbon, Li 2 NiO 2 , SP, and PVDF are proportioned according to the mass ratio of 70%: 20%: 5%: 5%. PVDF is first dissolved in DMA to obtain a glue solution with a mass concentration of 3%. After the above materials are mixed and stirred, they are slowly added while stirring in a vacuum environment DMA, slowly adjust the viscosity and solid content of the slurry to make it suitable for coating, stir for 2 hours to obtain the positive electrode slurry, coat the positive electrode slurry on the aluminum foil current collector with a thickness of 20 μm, and vacuum bake at 150°C for 12 hours, then mold Cut to get the positive plate of lithium ion capacitor.

[0043] Production of the negative electrode sheet: mix hard carbon, SP, SBR, and CMC according to the mass ratio of 92%: 3%: 2.5%: 2.5%, and use deionized water as the solvent to obtain the negative electrode slurry, and the negative electrode slurry Coated on a coppe...

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Abstract

The present invention discloses a method for preparing a lithium-replenishing material Li2NiO2, and a lithium ion capacitor using Li2NiO2. Li2O and NiO are used as raw materials, and are sintered at ahigh temperature after being ball milled in a protective atmosphere; then, Al2O3 is added to continue ball milling in the protective atmosphere and then sintered at a high temperature to obtain a target Li2NiO2. The lithium ion capacitor comprises a positive electrode, a negative electrode, a separation membrane and an electrolyte; the positive electrode comprises a positive electrode current collector, and a positive electrode material, a conductive agent and a binding material, which are dissolved in a solvent and coated on the positive electrode current collector; the negative electrode comprises a negative electrode current collector, and a negative electrode material, a conductive agent and a binding material, which are dissolved in the solvent and coated on the negative electrode material; the positive electrode material comprises a first positive electrode material and a second positive electrode material; the first positive electrode material is one of a carbon nanotube, graphene, active carbon, and nanogate carbon; and the material of the second positive electrode is Li2NiO2. The negative electrode can be pre-embedded with lithium by first charge and discharge.

Description

technical field [0001] The invention relates to a material for supplementing lithium at the negative pole of a lithium ion capacitor, a preparation method of the material and a lithium ion capacitor using the negative pole lithium supplementing material. Background technique [0002] Lithium-ion capacitors are energy storage devices that combine lithium-ion batteries and supercapacitors. Compared with supercapacitors, lithium-ion capacitors have higher energy density. Compared with lithium-ion batteries, lithium-ion capacitors have better low-temperature performance and better rate performance. A very important technology in the production process of lithium-ion capacitors is the pre-intercalation lithium technology of negative electrode materials. There are two main types of existing pre-intercalation lithium technologies: one is to use inert lithium powder (FMC, SLMP) or lithium metal Lithium supplementation, how to add inert lithium powder, the choice of solvent, and how...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/50H01G11/86C01G53/00
CPCC01G53/42C01P2006/40H01G11/46H01G11/50H01G11/86Y02E60/13
Inventor 林佳颐廖运平
Owner 浙江微创新能源有限公司
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