How is lithium-ion battery safer?

Affected by the worldwide storm of Samsung Note7 mobile phone battery, the public's concern about battery safety has gradually surfaced. Prior to this, the public opinion was once dominated by the argument that "the higher the energy density, the better the lithium battery ", and the one-on-one lithium battery fire accident, like a head-on drink, caused the public to think deeply: where’s good security? Is there a safe lithium-ion battery that can be used without any worries on the vast earth?

Solve battery safety issues

"Why is the lithium battery on fire?"

Answer: The active substance inside the battery reacts with the electrolyte, and the temperature is too high and the control is caused.

So what are the unstable factors in the battery? How does the fire occur in normal use?

1 battery is out of control

1. The thermal decomposition of the SEI film is the root cause of the thermal runaway of the battery.

2. The decomposition reaction of the SEI film causes a large amount of electrolyte to be liberated on the surface of the electrode to cause the temperature of the battery to rise.

2. The highly oxidizing positive electrode material is a strong oxidizing compound, which is prone to thermal decomposition reaction and easily releases oxygen.

3. The graphite negative electrode has strong reducing property, and it will immediately burn and ignite the electrolyte and the diaphragm when it contacts with oxygen.

Titanium solution: The reactivity between lithium titanate and electrolyte is low, and almost no SEI film is formed, which improves the stability and safety of the battery.

2 lithium dendritic destruction battery structure

When the graphite material is used as the negative electrode material, the potential is very close to the reduction potential of lithium, and some lithium ions in the electrolyte may be reduced to metallic lithium during use, and the area of the formed metal lithium is expanded to form a branch. The crystal pierces the diaphragm, causing a short circuit in the battery, causing a safety accident.

Titanium solution: lithium titanate material is used instead of graphite (carbon) material as the negative electrode of lithium ion battery, which improves the safety of the battery itself, fundamentally eliminates the generation of metal lithium dendrites and avoids the safety problems associated with this.

3 high current fast charging

If the charging current is too large, the internal polarization of the corresponding battery is large, the stability of the battery is deteriorated, and the voltage and temperature are rapidly increased, resulting in an increase in the energy of the battery body, thereby causing fire and explosion.

Titanium solution: The characteristics of lithium titanate material make Yinlong Titanium have ultra-high power and close to ultra-capacitor charge and discharge characteristics. It can withstand large currents for rapid charge and discharge.

The page contains the contents of the machine translation.