Lithium-Air Battery Cathode Using Cobalt Oxide Spinel
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Solution Overview
Problem
Lithium-air batteries face high charge voltage and low energy efficiency due to the reaction of carbon materials with lithium peroxide and decomposition of binders, leading to short cycle life and accumulation of byproducts.
Innovation Solution
A cathode using cobalt oxide with a spinel structure is developed, manufactured by stirring a cobalt salt with triethanolamine and distilled water, electroplating on a porous support, reacting with a mixture of oxalic acid and ethanol, and thermal treatment, eliminating the need for carbon and binders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If porous carbon and binder are used as cathode materials, then the cathode can be manufactured with conventional methods, but the charge voltage becomes very high and energy efficiency becomes low due to side reactions with lithium peroxide
Solution Approach 1:
The invention extracts and removes the harmful components (porous carbon and binder) from the cathode structure. By eliminating these materials that cause side reactions with lithium peroxide, the patent achieves lower charge voltage and improved energy efficiency while maintaining cathode functionality through alternative materials.
Solution Approach 2:
The invention changes the material parameters of the cathode from conventional porous carbon and binder to a binder-free structure with alternative materials. This parameter change eliminates the chemical reactions that cause high charge voltage, thereby improving energy efficiency without sacrificing manufacturability.
2Stability of the object's composition
If porous carbon and binder are used as cathode materials, then the cathode structure can be maintained, but byproducts accumulate continuously during cycling, shortening battery life
Solution Approach 1:
The invention removes the binder component from the cathode structure, eliminating the source of continuous byproduct formation during cycling. This extraction of harmful materials prevents accumulation reactions and extends battery cycle life while maintaining structural stability through alternative design.
Solution Approach 2:
The invention converts the harmful effect of binder decomposition into a benefit by eliminating the binder entirely. By removing the source of byproduct accumulation, the patent transforms the problem of short cycle life into an opportunity for improved battery durability and performance.
3Loss of energy
If cobalt oxide with spinel structure is used as cathode, then charge voltage is lowered and energy efficiency is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The invention employs cobalt oxide with spinel structure as a composite material that provides both the desired electrochemical performance (lower charge voltage, higher energy efficiency) and structural stability. This material selection achieves the dual goal of improved energy efficiency and manageable manufacturing complexity.
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
This approach lowers the charge voltage and enhances energy efficiency and cycle life by preventing side reactions and byproduct accumulation, as demonstrated by improved charge-discharge capacity and cycle stability.
Implementation Method 1
stirring a cobalt salt, triethanolamine and distilled water, thus preparing a cobalt solution
Implementation Method 2
electroplating the cobalt solution on a porous support, thus preparing a cobalt plated porous support
Implementation Method 3
reacting the cobalt plated porous support with a mixture solution comprising oxalic acid, water and ethanol, thus forming cobalt oxalate on the porous support
Implementation Method 4
thermally treating the cobalt oxalate
Data Source
AI summary
This invention relates to a cathode for a lithium-air battery, a method of manufacturing the same and a lithium-air battery including the same. The method of manufacturing the cathode for a lithium-air battery includes 1) stirring a cobalt salt, triethanolamine and distilled water, thus preparing a cobalt solution, 2) electroplating the cobalt solution on a porous support, thus preparing a cobalt plated porous support, 3) reacting the cobalt plated porous support with a mixture solution including oxalic acid, water and ethanol, thus forming cobalt oxalate on the porous support, and 4) thermally treating the cobalt oxalate.