Lithium-ion battery

Ministry of Electronics and Information Technology launches India’s largest lithium-ion battery plant in Haryana.

What is a Lithium-ion (Li-ion) Battery?

A Lithium-ion (Li-Ion battery) is a type of rechargeable battery that uses lithium compounds as one of the electrodes.
In 1985, Akira Yoshino developed the first prototype.

Each Lithium battery cell has essentially three components.
- A Positive electrode – (Lithium cobalt oxide, or LiCoO2).
- A Negative electrode – (Carbon).
- A Separator – Electrolyte – most commonly used (lithium salt, such as LiPF6) in an organic solution.
- In addition, lithium-ion batteries incorporate other elements that improve their performance and safety: a temperature sensor, a voltage regulator circuit and a state-of-charge monitor.
When the battery is charged, lithium ions flow from the positive electrode to the negative electrode through the electrolyte and attach to the carbon.
During discharge, the lithium ions return from the carbon to the LiCoO2.

Emergency power systems – server farms, the batteries of a UPS (Uninterruptible Power Supply).
Solar energy storage: Solar energy storage is intermittent, and these batteries are best suited to solar panels because they charge fast.
Consumer electronics and mobile devices: Allows for ever-increasing miniaturisation.
Disability assistance: electric wheelchairs, stairlifts or motorised prostheses.

High Efficiency: Charge/discharge efficiency ~90–95%; less energy wasted as heat, making them suitable for renewable integration (solar/wind).
High Energy Density: Lithium-ion batteries are top performers in energy storage, holding far more energy per unit weight compared to lead-acid batteries (260–270 Wh/kg vs. 50–100 Wh/kg).
Lightweight: On average, they weigh 50–60% less than traditional batteries, making them ideal for compact devices like smartphones and e-readers.
Longer lifecycle: Lithium-ion batteries can endure ~2,000 charge-discharge cycles, providing a longer lifespan of 8-10 years.
Long-Term Performance: Even after ~200 cycles, lithium batteries retain around 80% of their rated capacity, ensuring consistent performance over time.
Low Self-Discharge: Lithium-ion cells lose only ~5% charge initially and just 1–2% per month thereafter, far lower than most other rechargeable batteries.

Energy density is still lower compared to petrol.
Requires higher protection circuit to prevent thermal runaway if stressed.
Performance declines with time.
At freezing temperatures (zero degrees Celsius), quick charging is not possible.
Lithium-ion battery packs degrade significantly more quickly when exposed to heat.
Environmental concerns are primarily related to the mining of lithium.
The liquid electrolyte used in EV batteries is highly flammable.

Energy density is the amount of energy the battery can store with respect to its mass.
Power density is the amount of power that can be generated with respect to its mass.

Sodium-ion batteries are a promising alternative to lithium-ion batteries – currently the most widely used type of rechargeable battery.

Sodium-Ion Batteries	Lithium-Ion Batteries
Sodium is more than 500 times more abundant than lithium. Also extracted from seawater at a low cost.	Lithium availability is limited to a few countries, which is why prices have risen more than seven-fold since 2021.
Sodium is more environmentally friendly and can be transported at zero volt, making it safer.	Less environmentally friendly than sodium and must be always stored with a minimum charge, increasing fire risks.
A Sodium-ion battery uses aluminum which is cheaper than copper.	Lithium-ion battery uses copper, which is three or four times more expensive than aluminum used on sodium batteries.
Sodium-ion battery has a higher operating temperature range. Can be used in more extreme temperatures without the risk of thermal runaway.	Lithium-ion battery has lower operating temperature range and can cause fire if operated in higher temperatures.
Sodium-ion battery charges faster than lithium-ion variants and have a three times higher lifecycle.	Slow charge rate and smaller lifecycle compared to sodium-based batteries.