Lithium titanate

Key takeaways

Lithium titanate belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Lithium titanate to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lithium titanate from memory before moving on to harder problems.

Reference excerpt

Lithium titanates are chemical compounds of lithium, titanium and oxygen. They are mixed oxides and belong to the titanates. The most important lithium titanates are:

lithium titanate spinel, Li4Ti5O12 and the related compounds up to Li7Ti5O12. These titanates are used in lithium-titanate batteries. lithium metatitanate, a compound with the chemical formula Li2TiO3 and a melting point of 1,533 °C (2,791 °F) It is a white powder with possible applications in tritium breeding materials in nuclear fusion applications. Other lithium titanates, i.e. mixed oxides of the system Li2O–TiO2, are:

Lithium orthotitanate Li4TiO4, melting point of 1,200 °C (2,190 °F) Ramsdellite lithium titanate Li2Ti3O7 and LixTiO2 (0 ≦ x ≦ 0.57) with ramsdellite structure.

Lithium metatitanate Lithium metatitanate is a compound with the chemical formula Li2TiO3. It is a white powder with a melting point of 1,533 °C (2,791 °F). It is also used as an additive in porcelain enamels and ceramic insulating bodies based on titanates. It is frequently utilized as a flux due to its good stability. In recent years, along with other lithium ceramics, metatitanate pebbles have been the subject of research efforts towards tritium breeding materials in nuclear fusion applications.

Crystallization The most stable lithium titanate phase is β-Li2TiO3 that belongs to the monoclinic system. A high-temperature cubic phase exhibiting solid-solution type behavior is referred to as γ-Li2TiO3 and is known to form reversibly above temperatures in the range 1150-1250 °C. A metastable cubic phase, isostructural with γ-Li2TiO3 is referred to as α-Li2TiO3; it is formed at low temperatures, and transforms to the more stable β-phase upon heating to 400 °C.

Uses in sintering The sintering process is taking a powder, putting it into a mold and heating it to below its melting point. Sintering is based on atomic diffusion, the atoms in the powder particle diffuse into surrounding particles eventually forming a solid or porous material. It has been discovered that Li2TiO3 powders have a high purity and good sintering ability.

Uses as a cathode

Molten carbonate fuel cells Lithium titanate is used as a cathode in layer one of a double layer cathode for molten carbonate fuel cells. These fuel cells have two material layers, layer 1 and layer 2, which allow for the production of high power molten carbonate fuel cells that work more efficiently.

Lithium-ion batteries Li2TiO3 is used in the cathode of some lithium-ion batteries, along with an aqueous binder and a conducting agent. Li2TiO3 is used because it is capable of stabilizing the high capacity cathode conducting agents; LiMO2 (M=Fe, Mn, Cr, Ni). Li2TiO3 and the conduction agents (LiMO2) are layered in order to create the cathode material. These layers allow for the occurrence of lithium diffusion.

Lithium-titanate battery The lithium-titanate battery is a rechargeable battery that is much faster to charge than other lithium-ion batteries. It differs from other lithium-ion batteries because it uses lithium-titanate on the anode surface rather than carbon. This is advantageous because it does not create a solid electrolyte interface layer, which acts as a barrier to the ingress and egress of Li-ion to and from the anode. This allows lithium-titanate batteries to be recharged more quickly and provide higher currents when necessary. A disadvantage of the lithium-titanate battery is a much lower capacity and voltage than the conventional lithium-ion battery. The lithium-titanate battery is currently being used in battery electric vehicles and other specialist applications.

Tritium breeding Fusion reactions, such as those in the proposed ITER thermonuclear demonstrator reactor, are fueled by tritium and deuterium. Tritium resources are extremely limited in their availability, with total resources currently estimated at twenty kilograms. Lithium-containing ceramic pebbles can be used as solid breeder materials in a component known as a helium-cooled breeder blanket for the production of tritium. The breeding blanket constitutes a key component of the ITER reactor design. In such reactor designs tritium is produced by neutrons leaving the plasma and interacting with lithium in the blanket. Li2TiO3 along with Li4SiO4 are attractive as tritium breeding materials because they exhibit high tritium release, low activation, and chemical stability.

Synthesis of lithium-titanate breeder powder Li2TiO3 powder is most commonly prepared by the mixing of lithium carbonate, Ti-nitrate solution, and citric acid followed by calcination, compaction, and sintering. The nanocrystalline material created is used as a breeder powder due to its high purity and activity.

Illustrations

Worked examples

Example 1 — a first encounter with Lithium titanate

Start with the simplest possible case. Write down what Lithium titanate claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lithium titanate before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lithium titanate ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lithium titanate

In research: Lithium titanate appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lithium titanate in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lithium titanate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Lithium salts, Titanates, so understanding it makes those chapters shorter.
In everyday life: Look for Lithium titanate outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study Lithium titanate in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lithium titanate means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Lithium titanate out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lithium titanate in simple terms?

Lithium titanates are chemical compounds of lithium, titanium and oxygen. They are mixed oxides and belong to the titanates.

Why does Lithium titanate matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lithium titanate?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lithium titanate.