Coated particles for lithium battery cathodes

A particle and coating technology, applied in battery electrodes, lithium batteries, secondary batteries, etc., can solve problems such as poor cycle life and incomplete coating

Active Publication Date: 2014-01-22
SEEO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these coatings have not been very successful in practice
They tend to fail in two ways: 1) poor cycle life due to incomplete surface coverage of the particles, and 2) high impedance due to their own ionic or electronic barrier properties

Method used

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  • Coated particles for lithium battery cathodes
  • Coated particles for lithium battery cathodes
  • Coated particles for lithium battery cathodes

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Embodiment Construction

[0018] Preferred embodiments are illustrated herein in the context of electrodes in lithium electrochemical cells. However, the skilled artisan will readily appreciate that the materials and methods disclosed herein will have application in a variety of other contexts where it is desirable to protect particles from reactions with surrounding materials, particularly where maintaining electronic and ionic conductivity is important.

[0019] All publications referenced herein are hereby incorporated by reference in their entirety for all purposes as if set forth in full herein.

[0020] In this disclosure, the terms "positive electrode" and "cathode" are both used to mean "positive electrode".

[0021] New high-energy cathode materials are attracting attention for their promise for smaller, lighter, higher-energy-density battery cells. But these materials have still not been commercialized due to inherent stability issues, including electrolyte breakdown at high voltages and act...

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Abstract

Particles of cathodic materials are coated with polymer to prevent direct contact between the particles and the surrounding electrolyte. The polymers are held in place either by a) growing the polymers from initiators covalently bound to the particle, b) attachment of the already-formed polymers by covalently linking to functional groups attached to the particle, or c) electrostatic interactions resulting from incorporation of cationic or anionic groups in the polymer chain. Carbon or ceramic coatings may first be formed on the surfaces of the particles before the particles are coated with polymer. The polymer coating is both electronically and ionically conductive.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application 61 / 643,346, filed May 7, 2012, which is incorporated herein by reference. [0003] Statement of Government Support [0004] The invention described and claimed herein was made in part with funds provided by the US Department of Energy under Contract No. DE-OE0000223. The US Government has certain rights in this invention. field of invention [0005] The present invention relates generally to secondary lithium batteries, and more particularly to materials for the cathodes of such batteries. Background technique [0006] A typical composite cathode in a lithium battery consists of several materials such as cathode active material, conductive additive, binder, and electrolyte, each of which performs a different function. Efficiently designed cathodes can have porous active materials that can be in electrical communication with the current collector an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/137H01M4/525H01M10/052
CPCH01M4/137H01M4/525H01M10/0525H01M4/366H01M4/485H01M4/505H01M4/5825H01M4/622H01M4/623H01M4/624Y02E60/10B05D1/34
Inventor M·辛哈尼·埃陶尼拉塞尔·普拉特斯科特·穆林晓-亮·王
Owner SEEO
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