The Effect of Synthesis Parameters on the Electrochemical Performance of Li4Ti5O12

Yıl 2022, Cilt: 15 Sayı: 2, 482 - 497, 31.08.2022

Fatma Kılıç Dokan , Şaban Patat

https://doi.org/10.18185/erzifbed.979824

Öz

The spinel Li4Ti5O12 is synthesized by a solid-state method. The effect of the synthesis parameters including lithium content, source of Ti and grinding on the electrochemical performance of Li4Ti5O12 is investigated to optimize the crystalline size, particle size, surface area, morphology and crystallinity of the synthesized materials. The physical properties are determined by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), N2 adsoption/desorption and conductivity measurements. The electrochemical properties are investigated by conductivity and galvanostatic charge-discharge measurements. Material characterization and electrochemical measurements indicate that the best electrochemical performance can be obtained by using the Li/Ti molar ratio of 4.25/5, ball milling (BM) and anatase TiO2 (A) as starting material. Li4.25Ti5O12 A-BM, obtained via ball-mill assisted solid-state method and using anatase TiO2 as the source of Ti, exhibit the most homogeneous morphology, the least crystal and particle sizes, and highest surface area. The best-performing Li4.25Ti5O12A-BM delivers a satisfactory performance with a high charge capacity (141 mAh/g) and small capacity fading (3.6% after 30 charge-discharge cycles) at a 1 C rate (1C=175 mAh.g-1).

Anahtar Kelimeler

Lithium-Ion Batteries, Li4Ti5O12, Anode Material, Ball Mill (BM)

The Effect of Synthesis Parameters on the Electrochemical Performance of Li4Ti5O12

Öz

Spinel Li4Ti5O12, katı hal yöntemiyle sentezlenmiştir. Sentezlenen malzemelerin kristal boyutunu, partikül boyutunu, yüzey alanını, morfolojisini ve kristalliğini optimize etmek için lityum içeriği, Ti kaynağı ve öğütme gibi sentez parametrelerinin Li4Ti5O12'nin elektrokimyasal performansı üzerindeki etkisi araştırılmıştır. Fiziksel özellikler, X-ışını toz kırınımı (XRD), taramalı elektron mikroskobu (SEM), N2 adsopsiyon/desorpsiyon ve iletkenlik ölçümleri ile belirlenmiştir. Elektrokimyasal özellikler, iletkenlik ve galvanostatik şarj-deşarj ölçümleri ile araştırılmıştır. Malzeme karakterizasyonu ve elektrokimyasal ölçümler, en iyi elektrokimyasal performansın Li/Ti molar oranı 4.25/5, bilyalı öğütme (BM) ve anataz TiO2 (A) başlangıç malzemesi olarak kullanılarak elde edilebileceğini göstermektedir. Bilyalı değirmen destekli katı hal yöntemiyle ve Ti kaynağı olarak anataz TiO2 kullanılarak elde edilen Li4.25Ti5O12 A-BM, en homojen morfolojiyi, en iyi kristal ve parçacık boyutlarını ve en yüksek yüzey alanını sergiler. En iyi performans gösteren Li4.25Ti5O12 A-BM, mükemmel şarj kapasitesi (141 mAh/g) ve düşük kapasite kaybı (30 şarj-deşarj döngüsünden sonra %3,6) ile 1 C akımda (1C=175 mAh.g) tatmin edici bir performans sunar. 

Anahtar Kelimeler

Lityum-iyon bataryalar, Li4Ti5O12, Anot materyali, Bilyeli Değirmen, Lityum-iyon bataryalar, Li4Ti5O12,Anot materyali, Bilyeli Değirmen

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