How is the energy density of lithium batteries enhanced? Why is the positive electrode more important than the negative electrode?
In simple terms: The positive electrode is the "weak link". Only by increasing its capacity and voltage can the overall energy density of the battery be significantly enhanced.
The theoretical capacity of silicon-based anode is extremely high, but why aren`t these materials used in mobile phone or electric vehicle batteries?
When silicon-based anode (Si) is charged, its volume expands by 300% (while graphite only expands by 10%), resulting in:
The electrode structure is cracked, shortening the battery lifespan;
Repeated expansion and contraction deteriorate conductivity and cause rapid capacity loss.
What are the differences between the electrolytes of solid-state batteries and traditional lithium batteries? Why can`t the old ones be used directly?
Solid-state electrolytes act as a "firewall and expressway", but their performance needs to be enhanced through "road-building techniques".
English
