Dual-Doped Nickel Cathode Material for Lower Battery Resistance

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Solution Overview

Problem

Lithium-ion secondary batteries using nickel-containing cathode active materials face challenges with increased resistance, which affects their performance and efficiency.

Innovation Solution

Incorporating dopant elements M1 and M2 with a specific ionic radii ratio (1.03 or more and 2.2 or less) into the cathode active material's transition metal layer, which alternates with a lithium layer, to facilitate the desorption and insertion of lithium ions, thereby reducing battery resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If nickel-containing cathode active material is used to achieve large capacity, then battery capacity is improved, but battery resistance increases

Engineering Contradiction:

Improvebattery capacityVSAvoidbattery resistance

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent changes the ionic radius parameter by selecting dopant elements with specific ionic radii ratios (0.6 ≤ r(M1)/r(Ni) < 1.0 and 1.0 ≤ r(M2)/r(Ni) < 1.4), which modifies the crystal structure parameters of the cathode material to reduce resistance while maintaining capacity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite doped structure by incorporating two types of dopant elements (M1 and M2) into the nickel-containing cathode material, forming a composite material that combines the high capacity of nickel with the resistance-reducing properties of the dopants

Inventive Principle:

Principle #40Composite materials

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The use of dopant elements with the specified ionic radii ratio in the cathode active material effectively reduces the resistance of lithium-ion secondary batteries, enhancing their performance and efficiency.

Implementation Method 1

a dopant element M1 and a dopant element M2 with an ionic radii ratio represented by M1/M2 of 1.03 or more and 2.2 or less are included

Methodology Applied

Scientific EffectIonic radii ratio effect:

Data Source

PatentUS20250201818A1Cathode active material, lithium-ion secondary battery, and method for producing cathode active material

Publication Date: 2025.06.19 TOYOTA JIDOSHA KK

AI summary

The present disclosure relates to a cathode active material, a lithium-ion secondary battery, and a method for producing the cathode active material. The cathode active material includes a dopant element M1 and a dopant element M2, in which a transition-metal layer containing nickel and a lithium layer are alternately arranged crystal structure, and an ionic radii ratio represented by M1/M2 is 1.03 or more and 2.2 or less.