Carbon Nanotube Sponge Anode for Lithium Ion Battery
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Solution Overview
Problem
Transition metal oxide anodes for lithium ion batteries face challenges such as volume expansion during charging and discharging, leading to damage, and low conductivity and reactivity, which hinder their practical application.
Innovation Solution
A lithium ion battery anode composed of a carbon nanotube sponge with uniformly attached transition metal oxide particles, forming a 3D honeycomb structure with high porosity and large specific surface area, enhancing conductivity and reactivity without the need for a binder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If transition metal oxide anode is used to replace graphite anode, then theoretical specific capacity is improved, but volume expansion during charging and discharging causes damage to the lithium ion battery
Solution Approach 1:
The patent employs a carbon coating layer as a flexible shell around the transition metal oxide particles. This carbon shell accommodates the volume expansion and contraction of the transition metal oxide during lithium ion insertion and extraction, preventing structural degradation and maintaining battery reliability while preserving the high capacity benefits of the transition metal oxide material.
Solution Approach 2:
The patent creates a composite structure combining transition metal oxide particles with carbon materials (such as carbon nanotubes or graphite). This composite approach allows the transition metal oxide to provide high theoretical specific capacity while the carbon component provides structural stability and accommodates volume changes, thus resolving the contradiction between capacity and reliability.
2Quantity of substance
If transition metal oxide anode is used, then theoretical specific capacity is improved, but inherently lower conductivity results in low reacting activity
Solution Approach 1:
The patent combines transition metal oxide with conductive carbon materials to form a composite anode. The carbon component provides a conductive network that enhances electron transport, while the transition metal oxide maintains its high lithium ion capacity. This composite structure simultaneously improves both conductivity and reacting activity while preserving the high capacity advantage.
Solution Approach 2:
The patent utilizes porous carbon structures or carbon materials with high surface area to create a conductive matrix that surrounds and contacts the transition metal oxide particles. This porous structure enhances the contact between the active material and electrolyte, improving ion transport and electrochemical activity while the carbon provides the necessary electrical conductivity.
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 carbon nanotube sponge supports transition metal oxide particles, preventing volume changes during charging and discharging, improving conductivity and reactivity, resulting in better electrochemical performance and environmental sustainability.
Implementation Method 1
The carbon nanotube sponge supports transition metal oxide particles, preventing volume changes during charging and discharging
Implementation Method 2
A lithium ion battery anode composed of a carbon nanotube sponge with uniformly attached transition metal oxide particles, forming a 3D honeycomb structure with high porosity and large specific surface area, enhancing conductivity
Implementation Method 3
during the discharging and charging, a volume of the transition metal oxide anode expands
Data Source
AI summary
A method for making lithium ion battery anode includes: scrapping a carbon nanotube array to obtain a carbon nanotube source, and adding the carbon nanotube source into water to form a carbon nanotube dispersion; providing a transition metal nitrate, adding the transition metal nitrate to the carbon nanotube dispersion to form a mixture of a carbon nanotube floccule and a transition metal nitrate solution; freeze-drying the mixture of the carbon nanotube floccule and the transition metal nitrate solution under vacuum condition to form a lithium ion batter anode preform; and, heat-treating the lithium ion battery anode preform to form the lithium ion battery anode.