Energy storage device based on nanocrystals including metal oxide rescaled by lithiation and supercapacitor using the same

Patent metadata

Field	Value
Publication number	US-10164239-B2
Application number	US-201514754478-A
Country	US
Kind code	B2
Filing date	Jun 29, 2015
Priority date	Dec 16, 2014
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

Disclosed is an energy storage device based on metal oxide nanocrystals resealed through lithiation, and a supercapacitor using the same. The energy storage device is fabricated by dispersing transition metal nanoparticles over a carbon-based support with a large specific surface area, and then, dispersing and resealing the nanoparticles over the support using lithium ions with strong reductive ability, so that the resealed metal particles are substantially particles dispersed and resealed over the support as particles having a size of less than 1 nanometer on the scale of atomic units. The supercapacitor is fabricated using the energy storage device. The energy storage device higher capacitance than before resealing of metal oxide. Since the resealed metal particles are those having a size of less than 1 nanometer on the scale of atomic units, interference between particles disappears to exhibit excellent cycle life characteristics of 100% maintained performance in even more than 100,000 cycles.

First claim

What is claimed is:

1. An energy storage device based on atomic clusters including transition metal oxide rescaled by lithiation, comprising: a carbon support; and transition metal nanoparticles dispersed thereon to be rescaled on the support by intercalation/deintercalation of lithium ions, wherein divalent transition metal ion (M 2 +) of the transition metal nanoparticles is reversely changed to zero-valent transition metal state (M 0 ) during lithiation and delithiation, and wherein the divalent transition metal ion reacts with atomic unit scale oxygen by lithiation, and is maintained on the scale of the atomic units when a duster returns to the transition metal oxide state while removing lithium in a M:LiO x core-shell structure,
wherein the transition metal oxide is at least one selected from RuO 2 , IrO 2 , MnO 2 , Mn 3 O 4 , Co 3 O 4 , NiCo 2 O 4 , V 2 O 5 , SnO 2 , TiO 2 , MoO 3 , and Fe 2 O 3 .

2. The device according to claim 1 , wherein the carbon is at least one selected from graphene, carbon nanotube and activated carbon.

3. The device according to claim 1 , wherein the transition metal particle has a size of 0.6 to 1 nanometer.

4. A supercapacitor with high current density of 12 A/g and long term cycle of 100,000 or more characteristics fabricated using the energy storage device based on nanocrystals including the rescaled transition metal oxide according to claim 1 .

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Kang Jeung-Ku
• Choi Kyung-Min
• Lee Dong-Ki
• Ock Il Woo
• Park Jung-Hyo
• Jeong Hyung-Mo

Classifications

• H01G11/50

  specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/0402 Primary

  Methods of deposition of the material · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title