Composite Negative Electrode Material for High-Rate Battery Cycling
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Solution Overview
Problem
Conventional secondary batteries face limitations in maintaining high capacity and cycle life due to structural instability and decreased performance with rapid charge-discharge rates, failing to meet market demands for high-performance, portable electronic devices.
Innovation Solution
A conductive composite material with a core, inner oxide or carbide coating layer, and outer carbon layer with halogen or VA element dopants is developed, enhancing conductivity, structural stability, and charge-discharge performance, and is used in the negative electrode of a secondary battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the charge-discharge rate is increased to meet quick charge-discharge requirements, then the power output is improved, but the charge-discharge capacity and cycle life are significantly decreased
Solution Approach 1:
The patent uses a composite material structure consisting of a core material (IVA element, metal, metal compound or alloy) coated with oxide, nitride or carbide layers, and further coated with a carbon material containing halogen or VA element dopants. This multi-layer composite structure enables the material to withstand high charge-discharge rates while maintaining structural integrity and extending cycle life, resolving the contradiction between power output and reliability.
2Quantity of substance
If conventional technical manners are used to increase capacity, then the energy density is improved, but the cyclicity and structural stability are not sufficient
Solution Approach 1:
The patent employs a composite material system with a core material and multiple coating layers (oxide/nitride/carbide intermediate layer and carbon outer layer with dopants). This composite structure provides both high capacity and excellent structural stability, preventing material degradation during repeated charge-discharge cycles while maintaining high energy density.
Solution Approach 2:
The patent modifies the chemical composition and physical structure of the electrode material by introducing dopants (halogen or VA elements) into the carbon coating layer and controlling the stoichiometry of the oxide/nitride/carbide intermediate layer. These parameter changes enhance both the capacity and structural stability of the material, resolving the contradiction between quantity and stability.
3Quantity of substance
If the charge-discharge capacity is increased, then the energy density is improved, but the capacity retention after cycles is significantly decreased
Solution Approach 1:
The patent uses a composite material structure with a core material coated with oxide/nitride/carbide layers and further coated with a carbon material containing dopants. This multi-layer composite provides high initial capacity while maintaining excellent capacity retention after numerous cycles, as the protective layers prevent material degradation and maintain structural integrity during cycling.
Data Source
AI summary
The present invention illustrates a conductive composite material, and a negative electrode materials and a secondary battery containing the same. The conductive composite material includes a core, an inner coating layer and an outer coating layer. The core is made of a first material selected from a group consisting of WA element, metal, metal compound or alloy. The inner coating layer is existed on the core and made of oxide, nitride or carbide of the first material. The outer coating layer is existed on the inner coating layer and made of a carbon material and a second material containing halogen or VA element.