SnO P2O5 Negative Electrode Material for Lithium Ion Batteries
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Solution Overview
Problem
Negative electrode materials for lithium ion secondary batteries face challenges with volume change during charge and discharge, leading to structural degradation, crack formation, and reduced cycle performance due to the use of materials like SnO and thermoplastic binders, which result in poor bondability and detachment of active materials.
Innovation Solution
A negative electrode material comprising SnO and P2O5 with a thermosetting resin binder, which provides improved bondability and volume change management through cross-linking reactions, enhancing cycle performance and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If SnO is used as a negative electrode material to achieve higher capacity density, then the battery capacity is improved, but the volume change during charge and discharge causes structural degradation and poor cycle performance
Solution Approach 1:
The invention changes the chemical composition parameters by incorporating P2O5 (5-50 mol%) into the SnO-based negative electrode material. This compositional modification allows the material to accommodate volume changes during lithium ion insertion/extraction, thereby maintaining structural integrity and improving cycle performance while preserving high capacity density.
Solution Approach 2:
The invention creates a composite material system combining SnO with P2O5 to form a new negative electrode material. The composite structure leverages the high capacity of SnO and the volume stability of P2O5, achieving both high battery capacity and excellent cycle performance through synergistic material combination.
2Ease of manufacture
If a thermoplastic straight-chain polymer binder is used to bind negative electrode active materials, then the material can be formed, but the bondability is weak and active materials detach during volume change
Solution Approach 1:
The invention changes the binder material parameters by replacing thermoplastic straight-chain polymers with thermosetting cross-linked polymers. The cross-linked structure provides superior adhesion strength and flexibility, enabling the binder to maintain strong bonding between active materials during volume changes while preserving ease of electrode manufacturing.
3Strength
If a thermosetting cross-linked polymer binder is used to improve bondability, then the binding strength is improved, but the volume change abatement capability must be enhanced
Solution Approach 1:
The invention creates a composite system where the thermosetting cross-linked polymer binder works synergistically with the P2O5-containing active material. The composite structure allows the binder to provide strong adhesion while the P2O5 component accommodates volume changes, achieving both high bondability and volume stability.
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 use of SnO and P2O5 with a thermosetting resin binder significantly improves the cycle performance and safety of lithium ion secondary batteries by stabilizing the volume change and maintaining electron conductivity, resulting in higher discharge capacity and extended battery life.
Implementation Method 1
a thermosetting resin binder, which provides improved bondability and volume change management through cross-linking reactions
Implementation Method 2
capable of abating the volume change thereof attributed to the storage and release reactions of lithium ions
Implementation Method 3
these materials function as electrode active materials that reversibly store and release lithium ions through charge and discharge
Implementation Method 4
an electron-conducting network is divided, which results in a problem of a reduction in discharge capacity
Data Source
AI summary
Provided is a negative electrode material for an electricity storage device, comprises, a negative electrode active material comprising a compound containing at least SnO and P2O5, and a binder comprising a thermosetting resin. Also provided is a negative electrode for an electricity storage device, comprising a current collector having a surface coated with the negative electrode material for an electricity storage device. Further provided is a method of producing the negative electrode for an electricity storage device, the method comprising the steps of: coating the surface of the current collector with the negative electrode material for an electricity storage device; and carrying out heat treatment of the current collector at 150 to 400° C. under reduced pressure.