Lithiophilic Carbon Anode Structure for Low-Temperature Solid Batteries
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Solution Overview
Problem
Conventional all-solid-state batteries with graphite-based anode active materials face challenges in lithium ion conductivity and storability, leading to low power output at room or low temperatures and premature lithium precipitation.
Innovation Solution
The development of an anode active material for all-solid-state batteries, comprising flake carbon fragments overlapped in multiple layers, with a lithiophilic material deposited in the spaces between the fragments and on their surfaces, enhancing lithium ion conductivity and interface stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphite-based anode active material is used in all-solid-state battery, then the battery structure is simple and manufacturing is easy, but lithium ion conductivity is poor and storability is low
Solution Approach 1:
The patent uses a composite structure consisting of flake carbon fragments overlapped in multiple layers with lithiophilic material deposited in the spaces between and on the surfaces. This composite design combines the structural stability of carbon with the high lithium affinity of lithiophilic materials, achieving both improved lithium ion conductivity and manageable structural complexity.
Solution Approach 2:
The lithiophilic material is selectively deposited in specific locations - in the spaces between flake carbon fragments and on their surfaces - rather than uniformly throughout. This local quality approach enhances lithium ion conductivity at critical interface regions while maintaining the overall structural integrity and minimizing unnecessary complexity.
2Reliability
If graphite-based anode active material is used in all-solid-state battery, then manufacturing process is simple, but storability and lifespan characteristics are poor
Solution Approach 1:
The lithiophilic material is deposited in advance onto the flake carbon fragments before assembly into the battery. This preliminary action ensures that the anode structure is pre-optimized for lithium ion storage and conductivity, improving storability and lifespan without requiring complex post-manufacturing processes or adjustments.
3Power
If conventional anode material is used, then power output at room temperature is limited, but using improved material increases complexity
Solution Approach 1:
The patent changes the physical and chemical parameters of the anode material by using flake carbon fragments with specific morphology and depositing lithiophilic material with controlled thickness and distribution. These parameter changes enhance lithium ion conductivity and power output at room temperature while keeping the structural complexity within acceptable limits through optimized deposition processes.
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 solution improves lithium ion conductivity and storability within the anode active material, enabling normal operation of all-solid-state batteries at room or low temperatures with increased power output and extended lifespan.
Implementation Method 1
a first material loaded in a space between the plurality of the flake carbon fragments and having lithiophilic property, and a second material applied onto at least a portion of a surface of the particle and having lithiophilic property
Data Source
AI summary
Disclosed are an anode active material for an all-solid-state battery in which a lithophilic material is deposited inside and on particles.