Week 1 Understanding Different Battery Chemistry

1. Aim: Prepare a table that includes materials & chemical reactions occurring at the anode and cathode of LCO, LMO, NCA, NMC, LFP, and LTO-type lithium-ion cells. Give your detailed explanation of it.
2. Aim: Compare the differences between each type of Li+ion battery based on their characteristics.

Battery:

• A Battery is a device consisting of one or more electrochemical cells with external connections for powering electrical devices such as Flashlights, mobile phones, and electric cars.
• When a battery is supplying electric power, its positive terminal is the cathode and its negative terminal is the anode.
• The terminal marked negative is the source of electrons that will flow through an external electric circuit to the positive terminal.
• When a battery is connected to an external electric load, a Redox reaction converts high-energy reactants to lower-energy products, and the free energy difference is delivered to the external circuit as electrical energy.
• There are two types of batteries,

1. 1. Primary cell - These are one-time use batteries and one-time not be recharged for further usage.
2. Secondary cell - These batteries can be recharged and can be used multiple times.

1. Prepare a table that includes materials & chemical reactions occurring at the anode and cathode of LCO, LMO, NCA, NMC, LFP, and LTO-type lithium-ion cells. Give your detailed explanation of it

Here for the chemical formula for Cathode material for x+y+z=1 and the chemical reactions are given below after the explanation of each cell type.

2. Compare the differences between each type of Li+ion battery based on their characteristics.

Lithium-only:

• Lithium-ion batteries are second to any type of battery that can be recharged for further usage.
• The Lithium lithium-ion four main Components are,

(i) Cathode

(ii) Anode

(iii) Electrolyte

(iv) Separator

1. Cathodes

They are the positive electrodes of the cell. The cathodes electrodes rode is usually made up of,

1. Layered Transition metal oxides - Has high Capacity but high in cost and poor in safety.
2. Spinel’s - High power Density but poor conductivity and stability.
3. Olivine’s - Lees capacity but has a long life and is high in safety.

1. Anode:

• They are the negative electrodes of the cell. The anode electrode is usually the electrode,

1. Graphite
2. Hard Carbon, these anodes are less in cost and high in stability and specific capacity.

• Electrolyte:
• An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent.
• The dissolved electrolyte separates into cations and anions, which disperse uniformly through the solvent.
• Generally Lithium-ion cells have electrolytes of Organic solvents such as Ethylene carbonate, dimethyl carbonate, propylene carbonate electrolytes Nate, and lithium salt as sole.

1. Separator:

• Battery separators provide a barrier between the anode negative) and the cathode positive) while enabling the exchange of lithium ions from one side to the other.
• They are materials that conduct ions but do not conduct the electrons through them.
• Li-ion cells use polyolefin as a conductor This material hashas excellent mechanical properties, and good chemical stability, and is low-cost as well.

Working of the lithium-ion battery:

Types of Lithium-ion batteries:

• In Lithium-ion batteries or cells, lithium is the key composition but still other metals like cobalt, and aluminum is being used for both positive and negative electrodes. Based on this composition of materials used for the electrodes lithium-ion batteries are divided into 6 different types

1. Lithium Cobalt Oxide(LCO)
2. Lithium Manganese Oxide (LMO)
3. Lithium Nickel Cobalt Aluminium oxide (NCA)
4. Lithium Nickel Manganese Cobalt Oxide (NMC)
5. Lithium Iron Phosphate (LFP)
6. Lithium Titanium Oxide (LTO)

1. Lithium cobalt oxide - LiCoO2 (LCO)

• Also known as lithium cobaltate or lithium-ion cobalt batteries, lithium cobalt oxide batteries are made from lithium carbonate and cobalt.
• They have a cobalt oxide cathode and use graphite carbon as their anode material; during discharge, lithium ions move from anode to cathode, with the flow reversing when the battery is charging.
• This type of battery has some drawbacks, including relatively short battery life and limited specific power. additionally, these batteries are not as safe as other types.
  2. Lithium Manganese Oxide - LiMn2O4 (LMO)
• The first commercial lithium-ion cells made with lithium manganese oxide as a cathode material were produced in 1996 by Moli Energy.
• Lithium manganese oxide batteries are notable for their high-temperature stability and are also safer than other lithium-ion battery types.
• For this reason, they are often used in medical equipment and devices, but they may also be used in power tools, electric bikes, and more.
• It is also possible to use lithium manganese oxide batteries to power laptops and electric powertrain cars.
  3. Lithium Nickel Cobalt Aluminium Oxide - LiNiCoAlO2 (NCA)
• Lithium nickel cobalt aluminum oxide batteries are also called NCA batteries and are becoming increasingly important in electric powertrains and grid storage.
• NCA batteries are not common in the consumer industry but are promising for the automotive industry.
  4. Lithium Nickel Manganese Cobalt Oxide - LiMnCoO2 (NMC)
• Also known as lithium manganese cobalt oxide or NMC batteries, include a cathode made of a combination of nickel, manganese, and cobalt.
• Like other lithium-ion battery varieties, NMC batteries can have either a high specific energy density or a high specific power. They cannot, however, have both properties.
• This battery type is most common in power tools and powertrains for vehicles.
• The cathode combination ratio is usually 60 percent nickel, 20 percent manganese, and 20 percent cobalt. This means that the raw material cost is lower than it is for other lithium-ion battery options, as cobalt can be quite expensive.
• These batteries may come down in price further in the future, as some battery makers are planning to switch their battery chemistry to a higher % of Nickel so that they can use less cobalt.
• This battery type is commonly preferred for electric vehicles due to its very low self-heating rate.

5. Lithium Iron Phosphate - LiFePo4 (LFP)

• Lithium iron phosphate batteries, also known as li-phosphate batteries, use phosphate as a cathode. They benefit from low resistance properties, which enhance their safety and thermal stability.
• Other benefits include durability and a long lifecycle — fully charged batteries can be stored with little change to the total lifespan of the battery’s charge.
• Li-phosphate batteries are often the most cost-effective option as well when their long battery life is taken into consideration. However, the lower voltage of the li-phosphate battery means that it has less energy than other types of lithium batteries.
• Accordingly, these batteries are often used in electric motorcycles as well as other applications that need a long lifecycle and significant safety.
  6. Lithium Iron Phosphate - LiFePo4 (LFP)
• Lithium iron phosphate batteries, also known as li-phosphate batteries, use phosphate as a cathode. They benefit from low resistance properties, which enhance their safety and thermal stability.
• Other benefits include durability and a long lifecycle — fully charged batteries can be stored with little change to the total lifespan of the battery’s charge.
• Li-phosphate batteries are often the most cost-effective option as well when their long battery life is taken into consideration. However, the lower voltage of the li-phosphate battery means that it has less energy than other types of lithium batteries.
• Accordingly, these batteries are often used in electric motorcycles as well as other applications that need a long lifecycle and significant safety.

Comparison Table:

Li-ion cell Type	Cathode	Anode	Electrolyte	Separator	Overall Reaction at Cathode & Anode	Application
LCO	Graphite	Lithium Cobalt Oxide	Ethylene Carbonate + Li salt	Polyolefin	Li1-xCoO2(s) + x Li+ + x e- → LiCoO2(s)	Mobile phones, laptops, and digital cameras
LMO	lithium manganese oxide	Graphite carbon	Methyl carbonate + Li salt	Polyolefin	Mn2+ + 2 LiC6 → Mn + 2 Li++ graphite	Power tools, medical devices, electric powertrains
NCA	Comprised Nickel cobalt & Aluminium	Graphite carbon	Propylene carbonate + Li salt	Polyolefin	Li(1−x)NiO2 → (2 − x)Li(1−x)/(2−x)Ni1/(2−x)O + x/2O2	Medical devices, industrial, electric powertrain (Tesla)
NMC	Comprised Nickel cobalt & Manganese	Lithium metal Graphite	Methyl carbonate + Li salt	Polyolefin	Li(x)MO2(s) → Li+(org) + Li(x-1)MO2(s) + e-.	E-bikes, medical devices, EVs, industrial
LFP	Comprised Lithium, Iron & Phosphate	Graphite Carbon	Propylene carbonate + Li salt	Polyolefin		Portable and stationary needing high load currents and endurance
LTO	Comprised Nickel cobalt & Manganese	Lithium–titanium oxide	Propylene carbonate + Li salt	Polyolefin	Li4Ti5O12 + 3Li+ + 3e → 4 Li7Ti5O12	UPS, electric powertrain (Mitsubishi i-MiEV, Honda Fit EV), solar-powered companioning

TECHNOLOGY	PROS / CONS	APPLICATION FIELD
Lithium Iron Phosphate (LFP-LiFePO4)	Excellent lifespan High level of safety Specific power Abundant material: Iron + Phosphate Slightly lower specific energy vvehicle vehicle	Vehicle traction (EV) Renewable energy storage Stationary batteries high power applications UPS, backup, etc.
Lithium-Cobalt-Oxide (LCO)	Specific energy Dangerous chemistry Limited Lifespan Rare material: Cobalt	Low power application Power tools
Lithium Nickel Cobalt Aluminium (NCA)	Specific energy Specific power Dangerous chemistry Cost Rare material: Cobalt	Electric Vehicles (TESLA) Power tools, etc.
Lithium Nickel Manganese Cobalt (NMC)	Specific energy Safety Limited Lifespan Rare material: Cobalt + Manganese	Embedded applications Power tools, etc. Powerwall (TESLA)

The below figure consists of trade-off radar among 5 main lithium-ion battery technologies which are given in 5 point scale