Borate Metal Oxide Cathode Coating for HF and Degradation Control

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Solution Overview

Problem

Cathode degradation in alkali metal oxide batteries leads to performance decline due to transition metal dissolution and hydrofluoric acid formation, which affects cycle life and rate capacity.

Innovation Solution

A metalloid metal oxide coating, specifically borate-based, is applied to the cathode active material to prevent direct contact with the electrolyte, acting as a barrier against oxidation-reduction side reactions and HF scavenger, while allowing alkali ion migration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a coating is applied to the cathode to prevent transition metal dissolution and HF formation, then reliability and cycle life are improved, but device complexity and manufacturing complexity increase

Engineering Contradiction:

Improvecathode stabilityVSAvoidcoating structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs composite coating materials comprising metal oxides (such as Al2O3, MgO, TiO2) combined with borates (such as B2O3, Li2O-2B2O3) to create a multi-functional protective layer. This composite approach allows the coating to simultaneously provide barrier protection against transition metal dissolution, scavenge HF, and maintain electrochemical performance, thereby improving reliability while managing the complexity through material composition rather than structural complexity

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The coating is applied specifically to the cathode surface where degradation occurs, providing localized protection exactly where needed. The coating composition and thickness are optimized for the specific cathode material being used, allowing targeted improvement of cathode stability without unnecessarily complicating the overall battery structure. This localized approach ensures that the protective function is concentrated at the critical interface between cathode and electrolyte

Inventive Principle:

Principle #3Local quality

2Reliability

If a coating is applied to prevent direct contact between cathode and electrolyte, then cathode degradation is reduced, but manufacturing complexity increases

Engineering Contradiction:

Improvecathode degradation resistanceVSAvoidcoating process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The coating is applied to the cathode material before assembly into the complete battery cell, allowing the protective layer to be formed under controlled conditions. This preliminary coating step ensures that the cathode is protected from the outset, preventing degradation before it can occur during battery operation. The coating process is integrated into the cathode manufacturing workflow, making it a standard step rather than an additional complexity in battery assembly

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent optimizes coating parameters such as thickness (typically 1-10 nm), composition ratios, and application methods to achieve effective protection with minimal material and process complexity. By carefully controlling these parameters, the coating provides sufficient protection against degradation while maintaining simplicity in the manufacturing process. The coating thickness and composition are tailored to the specific cathode material and operating conditions, achieving optimal protection without excessive complexity

Inventive Principle:

Principle #35Parameter changes

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 coating composition enhances battery performance, cycle life, and rate capacity by reducing degradation and maintaining high electrochemical discharge capacity.

Implementation Method 1

The surface coating of the cathode material act as a barrier layer to reduce the direct contact between electrode and electrolyte, which obstruct electrolyte penetration along the grain boundary, thus repressing the side reactions at the interface

Methodology Applied

Scientific EffectBarrier layer effect:

Implementation Method 2

Lately, borates based coatings were found to be effective in countering the negative impacts of HF formation and such

Methodology Applied

Scientific EffectHF scavenging: Absorption (physical)

Implementation Method 3

The impact of surface coating on the performance of the cathode material includes modification of surface chemistry improves the overall performance

Methodology Applied

Scientific EffectSurface chemistry modification:

Implementation Method 4

it also helps in protecting the surface from oxygen redox which occurs at high voltages

Methodology Applied

Scientific EffectOxygen redox prevention:

Data Source

PatentUS20260058131A1Metalloid metal oxide coated battery cathode

Publication Date: 2026.02.26 GEGADYNE ENERGY LABS PTE LTD

AI summary

The present invention generally discloses a metalloid metal oxide coating composition of Formula (I) for the alkali mixed metal oxide based battery cathode. The coating of said composition reduces reaction based degradation of the cathode as well as electrolyte, thereby improving performance, cycle life, and rate capacity of the battery. The present invention further relates to a method of preparing the coated cathode active material and process thereof.