Amorphous Phosphorus-Carbon Anode Material for High Reversible Capacity
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Solution Overview
Problem
Existing lithium ion secondary batteries face limitations in achieving high reversible capacity, particularly when using phosphorus as an anode active material.
Innovation Solution
An anode material comprising a P element and a C element in an amorphous state, produced through mechanical milling of phosphorus and carbon materials, optionally with additional Li and S elements, to enhance dispersibility and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If phosphorus is used as an anode active material to increase theoretical capacity, then reversible capacity can be increased, but the battery cannot achieve high reversible capacity in practice
Solution Approach 1:
The patent changes the physical state parameter of phosphorus from crystalline to amorphous form. This parameter change transforms the material properties, enabling better lithium ion diffusion pathways and achieving high reversible capacity (≥1700 mAh/g) that matches the theoretical capacity of phosphorus-based anodes.
Solution Approach 2:
The patent creates a composite anode material containing amorphous phosphorus combined with other elements (such as silicon, oxygen, or carbon). This composite structure leverages the high capacity of phosphorus while mitigating its drawbacks through the complementary properties of other materials, achieving both high reversible capacity and structural stability.
2Stability of the object's composition
If crystalline phosphorus structures are used, then material stability is maintained, but conductive paths for lithium dissolution and deposition are not optimized
Solution Approach 1:
The patent changes the structural parameter of phosphorus from ordered crystalline arrangement to disordered amorphous structure. This parameter change creates more accessible conductive paths for lithium ion diffusion while maintaining compositional stability, thereby optimizing both conductivity and material stability simultaneously.
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 amorphous anode material significantly increases the reversible capacity of lithium ion secondary batteries by optimizing conductive paths for lithium dissolution and deposition.
Implementation Method 1
in the amorphizing, mechanical milling may be carried out on the first raw material composition at a grinding energy of 3.07×10^11 kJ·sec/g or more
Data Source
AI summary
To provide an anode material configured to increase the reversible capacity of lithium ion secondary batteries, and a method for producing the anode material. The anode material is an anode material for lithium ion secondary batteries, comprising a P element and a C element and being in an amorphous state.