US 11,081,731 B2Granted

High-capacity rechargeable batteries

AssigneeInternational Business Machines Corporation

InventorsDevendra K. Sadana, Yun Seog Lee, Joel P. de Souza

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Abstract

High-capacity and high-performance rechargeable batteries containing a cathode material layer having an improved surface roughness is provided. A cathode material layer is provided in which at least an upper portion of the cathode material layer is composed of nanoparticles (i.e., particles having a particle size less than 0.1 μm). In some embodiments, a lower (or base) portion of the cathode material layer is composed of particles whose particle size is greater than the nanoparticles that form the upper portion of the cathode material layer. In other embodiments, the entirety of the cathode material layer is composed of the nanoparticles. In either embodiment, a conformal layer of a dielectric material can be disposed on a topmost surface of the upper portion of the cathode material layer. The presence of the conformal layer of dielectric material can further improve the smoothness of the cathode material layer.

Claims8

Dependent claims

A rechargeable battery comprising:

a cathode material bilayer structure located on a surface of a cathode current collector, wherein the cathode material bilayer structure comprises a lower portion composed of first particles having a first particle size and an upper portion composed of second particles having a second particle size that is less than the first particle size, wherein the first particles and the second particles are composed of a compositionally same electrically conductive material, wherein the upper portion of the cathode material bilayer structure has a topmost surface having a surface roughness of 2 μm root mean square or less and wherein the lower portion of the cathode material bilayer structure has a surface roughness that is greater than 2 μm root mean square;
a solid-state electrolyte having a thickness of less 5 μm or less located on the topmost surface of the cathode material bilayer structure;
an anode region located on the electrolyte;
and
an anode current collector located on the anode region.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/787,453Filed 18 Oct 2017
Published: US 2019/0115626 A118 Apr 2019
Granted: 3 Aug 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

H01M 10/0585
Construction or manufacture: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and…
H01M 4/131
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 4/366
Composites: as layered products
H01M 4/62
Electrodes composed of, or comprising, active material: selection of inactive substances as ingredients for active masses, e.g. binders, fillers