Laminated Electrode Material Layers for Lithium Battery

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Solution Overview

Problem

Lithium secondary batteries with Mn-rich active materials have low conductivity and output, especially at low temperatures, due to their high Mn-O content, necessitating a solution to enhance low-temperature performance and energy density.

Innovation Solution

The electrode comprises a current collector with a laminated structure of two electrode material layers, each containing different active materials, including lithium metal oxides and lithium metal phosphate, optimized in thickness and composition to improve conductivity and energy density.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If Mn-rich active materials are used in the electrode, then energy density is improved, but conductivity and output deteriorate, especially at low temperatures

Engineering Contradiction:

Improveenergy densityVSAvoidoutput

Core Design Contradiction:

Quantity of substanceVSPower

Solution Approach 1:

The electrode uses a composite structure with two distinct active material layers: a first layer containing Mn-rich lithium metal oxide (Li1+yMn2−yO4 where y>0) providing high energy density, and a second layer containing lithium phosphate (Li3PO4 or Li2SiO3) providing high conductivity. This composite material approach allows the electrode to simultaneously achieve high energy density from the Mn-rich material and high conductivity from the lithium phosphate layer, resolving the contradiction between energy density and output performance.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If Mn-rich active materials are used in the electrode, then energy density is improved, but low-temperature performance deteriorates

Engineering Contradiction:

Improveenergy densityVSAvoidlow-temperature performance

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The electrode combines Mn-rich lithium metal oxide for high energy density with lithium phosphate compounds (Li3PO4 or Li2SiO3) that maintain stable performance across temperature ranges. The lithium phosphate layer compensates for the poor low-temperature conductivity of Mn-rich materials, enabling the electrode to maintain both high energy density and reliable low-temperature operation.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The electrode structure divides different functional regions: the first active material layer (Mn-rich lithium metal oxide) is optimized for energy storage capacity, while the second active material layer (lithium phosphate) is optimized for ionic conductivity and temperature stability. This local differentiation of material properties allows each layer to perform its specialized function, with the lithium phosphate layer specifically addressing low-temperature performance requirements.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9985287B2Electrode including different electrode material layers and lithium secondary battery

Publication Date: 2018.05.29 LG ENERGY SOLUTION LTD

AI summary

Disclosed is an electrode including a current collector and an electrode material layer formed on the current collector, the electrode material layer including a first electrode material layer and second electrode material layer having different electrode active materials.