Week 1 Understanding Different Battery Chemistry

Lithium - ion batteries are the best and most commonly found batteries that are almost used in every field of application due to their robust and most often liquid less designs that have high energy densities and specific energy values. they are relitively inexpensive to make depending upon the type . they operate well under loads and are capable of bearing high temperature and shocks .

Note:- IBT.dox will contain the entire information ..

LOC – Lithium cobalt battery:

These batteries are manufactured using lithium carbonate and cobalt. They have a very heigh specific energy and thus are used in electronics. They have short battery life and low specific power.

Chemical formulae - LiCo02 (Lithium cobalt oxide)

Invention – 1991

Energy density – 150-200 Wh/kg

Cycle life – 500 – 1000

Charge (C-rate)- 0.7 to 1C , 4.20V

Anode – LiaC6 (graphite Carbone)

Cathode – LibCoO2 (cobalt oxide)

Carrier – Li+

Used: electronic devices and older or cheaper laptop batteries

Advantages:

• High energy density
• Long runtime

Disadvantages

• High loads heat the battery
• Low discharge current
• Limited safety
• Effected by cycling and aging
• High resistance and unserviceable

NMC – Lithium Manganese Cobolt Oxide :-

These are also known as lithium manganate spinel batteries(Li-NMC, LNMC NMC , or NCM). The moli energy manufactured the first commercial lithium-ion cells using lithium manganese oxide as the cathode material in 1996. These batteries are safer and hive a higher stability towards high temperature operations. They are mostly found and used in medical applications and tool

For these types of batteries generally the cathode and anode is a blend of multiple materials and cannot be defined as it varies from each manufacturer.

Chemical formulae – LiNi_xMn_yCo_zO₂

Invention – 1980

Energy density – 150-200 Wh/kg

Anode – LiaC6 (Multi-material mixture)

Cathode – LibCoO2

Carrier – Li+

Used: mostly found in mobile electronics

Advantages:

• Long life
• Low cost
• High density in a small package
• Cathode contains most current

Disadvantages

• Based on the materials added the disadvantages vary
• The growth or shrinkage of batteries
• Poor stability
• Low voltage output

LFP – Lithium Iron Phosphate

The phosphate is used as cathode, these are also often used as li-phosphate batteries . They have low resistance qualities which improve thermal stability and safety. They are more durable and perform for higher life cycles and cost less. They form a carbon nanotube type of structure to store energy.

Chemical formulae – LiFePO₄

Cycles – 2000 to 12000

Invention – John B Goodenough 1950

Energy density – 90-160 Wh/kg

Charge – 3.2V or 610 C/g

Anode – graphite carbone in metallic backing

Cathode – polyanion class of cathode (C-LiFePO₄)

Carrier – Li+

Specific capacity – 170mA

Used: it is mostly seen in solar energy related applications.

Advantages:

• Low cost
• Low toxicity
• Well defined performance
• Stability

Disadvantages

• More stable at fully charged conditions
• Low nominal voltage
• Self discharge

LTO – Lithium Titanate

These are often called as li-titanate. These batteries have a growing number of uses because of its superior nano-technology . these batteries recharge very quickly, these batteries are often coupled and used with other batteries and are mostly used in electric vehicles. The problem with such batteries is that they have very low intrinsic voltages and energy density. They are also used in aerospace applications and they can be made smaller than other batteries and thus are used in several backup and data protection applications.

Chemical formulae – Li₂TiO₃

Invention – 2005 by altairnano

Energy density – 117 Wh/L

Specific energy – 60 -110 Wh/Kg

Cycles – 6000 -10000

Anode – Lithium titanate nanocrystals

Cathode – layers of molten carbon

Charge – 2.4 V

Carrier – Li+

Used: military, aerospace are the two main industries that use these batteries

Advantages:

• Safety and stability during use
• Highly reliable
• Fast charging and performance
• Long life cycle
• Temperature resistance

Disadvantages

• Low energy density
• Cost
• Excessive R&D required before use

NCAs – Lithium Nickel Cobalt Aluminum Oxide

Lithium nickel cobalt aluminium oxide batteries are being used in electric vehicles and grid storage. They have very little use in the general consumer electronics and mostly used for automobiles or defence related industries. They are of a high energy with long life span. They however lack in terms of safety. Thus, they require sophisticated monitoring and regulating control systems.

Chemical formulae - LiNi_0,84Co_0,12Al_0,04O₂

Invention – 1999

Anode – graphite’s and hard carbons

Cathode – lithium, nickle, cobalt, aluminium cations

Carrier – any of the cations

Charge – 3.6 to 4 V

Used: used greatly by Panasonic and tesla

Advantages:

• Cost
• Storage
• Stability and safety

Disadvantages

• Deuteriation and breakdown
• Overcharge thermal runaway

LMO – Lithium manganes oxide battery:

This is structured as a spinel inside the battery to improve the flow of ions. It includes lithium saults that serve as an organic solvent and acts like the bridge. These types of batteries are generally not rechargeable. They are designed to be very flexible and can be used in a wide range of applications

Chemical formulae – LiMnO₂

Invention – 1996

Energy density – 150-200 Wh/kg

Cycle life – 500 – 1000

Charge (C-rate)- 1C-10C , 3.5 V

Anode – Lithium

Cathode – Manganese

Carrier – Li+

Used: non rechargeable batteries for small scale electronics.

Advantages:

• Low cost
• Easy to manufacture
• High temperature range
• Stable and safe

Disadvantages

• Not rechargeable
• Although safe may explode
• Due to ease of manufacturing. Fakes and low quality products are made
• May get damaged during transporting
• And if harmful when exposed to ultrasonic waves.

Definitions:

Energy density is the measure of how much energy a battery contains in proportion to its weight. This measurement is typically presented in Watt-hours per kilogram (Wh/kg).

Specific energy or massic energy is energy per unit mass. It is also sometimes called gravimetric energy density, or just energy density though energy density more precisely means energy per unit volume.

Cycle – Each round of full discharge to full charge is one cycle

Capacity - Batteries have different ratings for the amount of power a given battery can store. When a battery is fully charged, the capacity is the amount of power it contains.

Nominal Cell Voltage - The average voltage a cell outputs when charged. The nominal voltage of a battery depends on the chemical reaction behind it.

Shape - Batteries come in many sizes and shapes. The term ‘AA’ references a specific shape and style of a cell.

Primary vs. Secondary - Primary batteries are synonymous with disposable. Once fully-drained, primary cells can't be recharged (reliably/safely). Secondary batteries are better known as rechargeable. These require another power source to fully charge back up

Internal Discharge Rate - The rate at which the battery discharges itself over time is called internal discharge rate.

Safety - Because batteries store power, they are basically very tiny explosives. To prevent harm, batteries are designed to be as safe as possible.

References:-

1. https://sinovoltaics.com/learning-center/storage/lco-batteries/#:~:text=LCO%20batteries%20technology%20and%20applications,all%20laptops%20and%20phone%20batteries.
2. https://en.wikipedia.org/
3. https://www.fluxpower.com/blog/what-is-the-energy-density-of-a-lithium-ion-battery
4. https://inverted.in/blog/types-of-lithium-ion-batteries-available-in-the-market
5. https://matmatch.com/materials
6. https://learn.sparkfun.com/tutorials/battery-technologies/all