Lithium titanate is a kind ofinorganic compound, the molecular formula is LifourTifiveOtwelve。Its appearance is white powder, melting point is 1520~1564 ℃, insoluble in water, and has a strong melting property.Can be used withTitanium glazeRaw materials, which can be used as fluxing agent, have the property of fluxing when the amount is small.[1]
It can cause inflammation on the skin and eyes, and there is no knownSensitization。Usually slightly harmful to waterHarmful effectsDo not contact undiluted or large quantities of products with groundwater, waterways or sewage systems, and do not discharge materials intosurrounding environment。
Chinese name
Lithium titanate
Foreign name
Lithium titanate
Alias
Lithium titanium oxide
chemical formula
LifourTifiveOtwelve
molecular weight
four hundred and fifty-nine point one four four eight
Appropriate amount of TiO ₂ and Li can be usedtwoCOthreeHeat them together to about 950 ℃ for preparation.[1]
Storage method
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It shall be placed in a closed, cool, ventilated and dry place at room temperature, away from light, and not in contact with open fire.
Lithium neotitanate
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Material Introduction
Blade Electric Vehicles
Chinese name: new lithium titanate[2]
CAS：12031-95-7
Molecular formula: LifourTifiveOtwelve
Molecular weight: 459.1448
Color: white
The new lithium titanate is a "zero tension" material, which greatly extends the battery life, and the charging and discharging cycles can reach thousands of times.Newly developed lithium titanateNegative materialAndLithium manganateOf positive materialNew batteryGroup applied toComplementary sceneryGreenlightingabove."TraditionalSolar street lampThe lithium battery used for power storage is replaced every two yearsnew materials The service life of the lithium battery can reach 15 years.
”New lithium titanate electrode materials can also be used to manufacture large-scale energy storage and power lithium batteries,New lithium batteryThe discharge times are much higher than that of traditional lithium batteries.electric vehicleIt is also because of the problems of the battery that it is difficult to be popularized. For example, ordinary electric vehicles may need to replace the battery after two years of use, while new lithium batteries can be used for at least 10 years, which greatly reduces the cost of electric vehicles.stayEnvironmental protection and energy conservationFrom the perspective ofElectric busAs a new energy industryBlade Electric VehiclesOn the other hand, household energy storage has certain environmental value.Gree has taken the lead in launching the acquisition of new energy, and the acquired company is Yinlong New Energy, which specializes in lithium titanate pure electric vehicles. It seems that Gree has realized that the change of this new energy to our future is only a matter of time.[3]
Structural characteristics
Spinel structure of lithium titanate
LifourTifiveOtwelveIt is a kind of metallithiumAnd low potential transition metaltitaniumOfComposite oxide, belonging to ABtwoXfourSeries, which can be described asspinelSolid solution.
Its spacePoint groupFd3mSpace group，Unit cellParameter a is 0.836nm, which is non-conductiveWhite crystal, stable in air.Structure similar to inversespinel: 32 oxygen anion O in one celltwo. PressCubic dense packingArranged, accounting for 3/4 of the totallithiumIon Li+It is adjacent to four oxygen ionsRegular tetrahedronLigand embedded in the void, the restLithium ionAnd all titanium ions Ti4+(atomic number 1:5) is closely adjacent to six oxygen ionsOctahedronligandThe structure can be expressed as Li [Li1/3Ti5/3]Ofour，LifourTifiveOtwelveStable and compact structure can provide access for limited lithium ions.LifourTifiveOtwelveIntrinsic electronconductivityIs 10-9S/CM
LifourTifiveOtwelveThe biggest feature is its "zero strain".The so-called "zero strain" refers tocrystalWhen lithium ion is embedded or removedlattice constantAnd volume change is very small, less than 1%.In the charge discharge cycle, this "zero strain" can avoid the structural damage caused by the back and forth expansion of the electrode material, thus improving the cycle performance and service life of the electrode and reducing theSpecific capacityAttenuation, excellent overcharge resistanceOverplayfeatures.
Negative material
Theory of lithium titanate materialsSpecific capacity175 mAh g-1The actual specific capacity is more than 160mAh g-1。Lithium titanate material has unique advantages such as:
1. Long cycle life and high stability;
2. The discharge platform can reach 1.55V, and the platform is very flat;
3. LifourTifiveOtwelveIt is a "zero strain material", and lithium ion has good mobility;
4. This zero strain makes it more attractive in anode materials of lithium batteries.
1. It is a zero strain material with good cycling performance;
twodischarge voltage Smooth, andelectrolyteNo decomposition occurs, improving the safety performance of lithium battery;
3. With carbonNegative materialIn contrast, lithium titanate has high lithium iondiffusion coefficient(2 * 10-8cmtwo/s) , can be charged and discharged at high rate;
4. The potential of lithium titanate is higher than that of pure lithium metal, so it is not easy to produce lithium dendrites, which provides a basis for ensuring the safety of lithium batteries.
