Graphite Composite Particles for Solid-State Battery Contact Loss
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Solution Overview
Problem
The use of solid electrolytes in all-solid type batteries results in reduced electrochemical reaction sites and capacity due to insufficient contact between the active material and the electrolyte, leading to capacity and output reduction.
Innovation Solution
The development of complex particles comprising graphite particles filled with a mixture of a solid electrolyte and a conductive material, formed through a mechanical granulation process, to enhance contact area and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolyte is used in all-solid type battery, then battery safety and reliability are improved, but contact area between electrolyte and active material is reduced
Solution Approach 1:
The patent applies the nesting principle by filling the internal pores and voids of graphite particles with solid electrolyte material. The solid electrolyte is nested within the graphite particle structure, creating internal contact sites that would not be accessible in conventional surface-only contact configurations. This nested arrangement dramatically increases the effective contact area between electrolyte and active material while maintaining the safety benefits of solid electrolyte usage.
Solution Approach 2:
The patent utilizes the porous structure of graphite particles to enhance electrolyte contact. By filling the inherent pores of the graphite material with solid electrolyte, the invention creates numerous internal interfaces for electrochemical reactions. The porous architecture provides extensive surface area within the particle interior, allowing the solid electrolyte to contact active material at multiple locations simultaneously, thus resolving the contact area limitation.
2Reliability
If solid electrolyte is used in all-solid type battery, then battery safety is improved, but output and capacity are reduced
Solution Approach 1:
The nesting of solid electrolyte within graphite particles creates numerous internal reaction sites, enabling simultaneous electrochemical reactions at multiple locations. This dramatically increases the effective reaction area and allows higher current densities to be sustained, thereby improving battery output and capacity while maintaining the safety advantages of solid electrolyte technology.
Solution Approach 2:
The porous graphite structure filled with solid electrolyte provides extensive internal surface area for electrochemical reactions. This increased reaction interface area enables higher reaction rates and improved ion transport pathways, directly enhancing battery output and capacity performance while preserving the inherent safety benefits of using solid electrolyte instead of liquid electrolyte.
3Reliability
If solid electrolyte is used in all-solid type battery, then battery safety is improved, but capacity is reduced
Solution Approach 1:
By nesting solid electrolyte within the graphite particle structure, the invention maximizes the utilization of active material throughout the particle volume. The internal electrolyte filling ensures that lithium ions can access and react with active material at multiple internal locations, increasing the effective capacity contribution from each graphite particle while maintaining the safety benefits of solid electrolyte technology.
Solution Approach 2:
The porous graphite structure provides extensive internal volume and surface area that, when filled with solid electrolyte, creates numerous sites for lithium insertion and extraction reactions. This increases the total quantity of electrochemically active interfaces, thereby enhancing battery capacity while preserving the safety advantages of solid electrolyte usage.
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 complex particles maintain high ionic and electronic conductivity, ensuring no capacity or output reduction, allowing for high-density electrodes with improved electrochemical performance.
Implementation Method 1
a first aspect of the present disclosure relates to the complex particles, and the complex particles include graphite particles of a granulated graphite material
Data Source
AI summary
Complex particles for a negative electrode active material according to the present disclosure have no problem with reduced capacity and output by virtue of sufficient electrochemical reaction sites between a solid electrolyte and an electrode active material. The complex particles according to the present disclosure include carbon particles of a carbon material such as flaky graphite, which are spherical in shape by shape modification, and a solid electrolyte and a conductive material filled between the particles, and thus have the increased contact area between the active material and the solid electrolyte increases, and ion conduction and electron conduction paths extended and maintained to the inside of the active material particles.