Electrochemical behaviors of wax-coated Li powder/Li4Ti5O12 cells

Park, Han Eol; Seong, Il Won; Yoon, Woo Young

doi:10.1016/j.jpowsour.2008.11.026

Cited by 18 publications

(13 citation statements)

References 11 publications

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“…Since small Li 4 Ti 5 O 12 particles are favorable for achieving a high rate LIB property by promoting the Li + intercalation and de‐intercalation processes through the short diffusion path and enhanced contact area between the electrode and electrolyte, better electrochemical properties are expected, especially with the Li 4 Ti 5 O 12 synthesized from A87R13 and Li 2 CO 3 . Moreover, it was found that 3 h of heat treatment at 800°C would be sufficient to obtain pure Li 4 Ti 5 O 12 if an adequate starting material is used, although most researchers have used a temperature of ≥800°C for ≥12 h …”

Section: Resultsmentioning

confidence: 99%

Effects of TiO₂ Starting Materials on the Solid‐State Formation of Li₄Ti₅O₁₂

2012

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This study examined the formation mechanism of Li4Ti5O12 by a solid‐state reaction between Li2CO3 and TiO2 for applications in lithium ion batteries. To explain the intermittent existence of rutile TiO2 in the final Li4Ti5O12, five types of TiO2 which had different anatase/rutile ratios were used as starting materials. Anatase to rutile‐phase transformation occurred from 600°C, which is significantly lower than the typical TiO2 transition temperature, when a pure anatase TiO2 and Li2CO3 mixture were heat‐treated. Moreover, this rutile TiO2 transformed from pure anatase TiO2 was found to be more rigid in the solid‐state reaction than an intact rutile or anatase‐rutile mixture, existing in the final Li4Ti5O12, even after heat treatment at 900°C for 15 h. This difference is explained by the anatase/rutile‐phase boundaries where an amorphous Li‐precursor was located, enhancing the solid‐state reaction due to the decreased diffusion path. Based on the observations, different formation mechanisms of Li4Ti5O12 depending on the types of TiO2 starting materials were proposed.

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Section: Resultsmentioning

confidence: 99%

Effects of TiO₂ Starting Materials on the Solid‐State Formation of Li₄Ti₅O₁₂

2012

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“…Following this trend, there are a large number of reports on doping various metal cations (V 5+ , Mn 4+ , Fe 3+ , etc.) into Li or Ti sites [9][10][11][12]. However, very few studies have been focused on improving the anode electrode rate capacity at high current density through doping non-metal anions into O sites until now.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and electrochemical properties of spinel Li4Ti5O12−x Cl x anode materials for lithium-ion batteries

Huang

Jia

et al. 2011

J Solid State Electrochem

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Li 4 Ti 5 O 12−x Cl x (0 ≤ x ≤ 0.3) compounds were synthesized successfully via high temperature solidstate reaction. X-ray diffraction and scanning electron microscopy were used to characterize their structure and morphology. Cyclic voltammetry, electrochemical impedance spectroscopy, and charge/discharge cycling performance tests were used to characterize their electrochemical properties. The results showed that the Li 4 Ti 5 O 12−x Cl x (0≤x≤0.3) compounds were well-crystallized pure spinel phase and that the grain sizes of the samples were about 3-8 μm. The Li 4 Ti 5 O 11.8 Cl 0.2 sample presented the best discharge capacity among all the samples and showed better reversibility and higher cyclic stability compared with pristine Li 4 Ti 5 O 12 . When the discharge rate was 0.5 C, the Li 4 Ti 5 O 11.8 Cl 0.2 sample presented the superior discharge capacity of 148.7 mAh g −1 , while that of the pristine Li 4 Ti 5 O 12 was 129.8 mAh g −1 ; when the discharge rate was 2 C, the Li 4 Ti 5 O 11.8 Cl 0.2 sample presented the discharge capacity of 120.7 mAh g −1 , while that of the pristine Li 4 Ti 5 O 12 was only 89.8 mAh g −1 .

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“…To resolve this problem, pioneering studies have aimed at the conductivity improvement of Li 4 Ti 5 O 12 powders, such as Cu particles using electrode-less deposition [9] and carbon coating using critic acid sol-gel method [3], sugar-containing impregnation [10], carbonization of resin [11], drop emulsion technique [12], and polyvinylbutyral rheological phase method [13]. Owing to great success, the Li 4 Ti 5 O 12 composites have been considered as a potential anode material for high-power Li-ion batteries.…”

Section: Introductionmentioning

confidence: 99%