Understanding the combined effects of microcrystal growth and band gap reduction for Fe(1−)Ti F3 nanocomposites as cathode materials for lithium-ion batteries

Bai, Ying; Zhou, Xingzhen; Jia, Zhe; Wu, Chuan; Yang, Liwei; Chen, Mizi; Zhao, Hui; Wu, Feng; Liu, Gao

doi:10.1016/j.nanoen.2015.08.006

Cited by 64 publications

(42 citation statements)

References 57 publications

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“…[20,76] That is to say no electrochemical reaction occurred in core region of FeF 3 (proved by TEM in Figure S5). [14,[80][81][82] To gain further insight into the improved electrochemical performance of FeF 3 @N-doped carbon composites, EIS measurements were conducted at two different states, one is the open circuit voltage after the batteries were assembled, the other is the charge state after the 200 th cycle at 2 C. All the Nyquist plots are similar with a semicircle at high frequency and an inclined straight line at low frequency (Figure 6a-b). And the rapid insertion/deintercalation of Li + would cause the volume of FeF 3 to change constantly, resulting in the collapse of crystal structure.…”

Section: Electrochemical Performancementioning

confidence: 98%

“…[4,77,78] These results indicated that the enhanced reversibility and kinetics for electrochemical reactions of [4,12,27,79] Furthermore, an additional anodic peak at about 4.3 V was detected in FC0 might be associated with the solid electrolyte interphase (SEI) film formation on the electrodes. [14,[80][81][82] To gain further insight into the improved electrochemical performance of FeF 3 @N-doped carbon composites, EIS measurements were conducted at two different states, one is the open circuit voltage after the batteries were assembled, the other is the charge state after the 200 th cycle at 2 C. All the Nyquist plots are similar with a semicircle at high frequency and an inclined straight line at low frequency (Figure 6a-b). An equivalent electrical circuit model was designed to analyze the EIS date (Figure 6c).…”

Section: Electrochemical Performancementioning

confidence: 98%

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Improved Electrochemical Performance of FeF₃ by Inlaying in a Nitrogen‐Doped Carbon Matrix

Zhu

et al. 2019

ChemElectroChem

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FeF 3 is favored by researchers because of its high theoretical specific capacity and high voltage. It is expected to be utilized as a cathode material for lithium-ion batteries in the future. However, the poor electronic conductivity, inferior reaction kinetics, and severe volume expansion seriously prevents its practical application. Herein, a FeF 3 @N-doped carbon nanocomposite was successfully produced by in situ fluorination and dehydration. In addition, the nanocomposite showed a reversible capacity of 84.9 mAh g À 1 for 200th cycle after cycling at a high current of 2 C, which is approximately 300 times higher than that of bare FeF 3 . Benefitting from the N-doped carbon matrix, the composite electrodes exhibited minor transfer resistance (117.4 Ω, only 44.0 % of that of bare FeF 3 ) and very low polarization voltage (ca. 0.19 V). Meanwhile, it provided a buffer for volume expansion during the insertion of Li + and maintained cycling stability. This work can supply a simple pathway for designing ultrahigh-rate and long-life FeF 3 cathode materials.

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Section: Electrochemical Performancementioning

confidence: 98%

Section: Electrochemical Performancementioning

confidence: 98%

Improved Electrochemical Performance of FeF₃ by Inlaying in a Nitrogen‐Doped Carbon Matrix

Zhu

et al. 2019

ChemElectroChem

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“…Because of the irreversible formation of solid electrolyte interphase (SEI) in the first cycle, the specific capacities in the first cycle are not stable. [6,[29][30][45][46][47] The specific capacities in the second cycle are consequently regarded as reversible. Both S300/SP and S400/SP deliver the high reversible capacities.…”

Section: Electrochemical Performancementioning

confidence: 99%

“…[12] In fact, the actual capacity of FeF 3 is reduced largely by its poor electronic and ionic conductivity. [13][14][15] In order to improve the electrochemical performance of FeF 3 , many methods have been introduced, such as FeF 3 /carbon composite prepared by high energy milling with conductive agents [13][14][15][16][17], nanofabrication [18][19][20][21][22], thin films obtained by Pulsed Laser Deposition technique [23][24][25], in site coating [26][27], metal doping [28][29] and so on. Among all of them, high energy milling with conductive agents is a simple and effective method as the grain size can be significantly reduced with the conductive network established at the same time.…”

Section: Introductionmentioning

confidence: 99%

3D Hierarchical nano-flake/micro-flower iron fluoride with hydration water induced tunnels for secondary lithium battery cathodes

et al. 2017

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As a potential multi-electron electrode material for next generation lithium ion batteries, iron fluoride (FeF 3 ) and its analogues are attracting much more attentions. Their microstructures are the key to achieve good electrochemical performances. In this work, FeF 3 ·3H 2 O nano-flakes precursor with high crystallinity and flower-like morphology is synthesized successfully, by a liquid precipitation method using Fe(NO 3 ) 3 ·9H 2 O and NH 4 HF 2 as raw materials. The formation and the crystal growth mechanisms of the FeF 3 ·3H 2 O precursors are investigated and discussed. After different temperature heat-treatment and followed by ball-milling with Super P, the as-prepared FeF 3 ·0.33H 2 O/C and FeF 3 /C nanocomposites are used as cathode materials for lithium ion batteries. The FeF 3 ·0.33H 2 O/C nanocomposite exhibits a noticeable initial specific capacity of 187.1 mAh g -1 and reversible specific capacity of 172.3 mAh g -1 at 0.1C within a potential range of 2.0-4.5V. The capacity retention is as high as 97.33% after 50 cycles. Combined with HRTEM test, it confirms that the hydration water is not harmful but useful, namely, the tunnel phase formed with the hydration water is crucial to unobstructed Li + diffusion, and therefore leading to excellent electrochemical performances.

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“…[ 28‐32 ] In addition to these materials, due to the special tunnel structure which is beneficial to Li + transportation, the FeF 3 ·0.33H 2 O also shows good electrochemical performance, [ 33‐35 ] and some other studies on the application of FeF 3 in cathode materials for lithium‐ion batteries have also been carried out. [ 36‐37 ] Figure 1 shows the specific capacity and upper cut‐off voltage of several commonly used cathode materials. [ 38 ] As we can see, compared with other cathode materials, layered ternary oxide cathode materials have the highest specific capacity and a higher upper cut‐off voltage.…”

Section: Introductionmentioning

confidence: 99%

High‐Voltage Layered Ternary Oxide Cathode Materials: Failure Mechanisms and Modification Methods^†

et al. 2020

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Due to the large reversible capacity, high operating voltage and low cost, layered ternary oxide cathode materials LiNixCoyAl1−x−yO2 (NCA) and LiNixCoyMn1−x−yO2 (NCM) are considered as the most potential candidate materials for lithium-ion batteries (LIBs) used in (hybrid) electric vehicles (EVs). However, next-generation long-range EVs require a high specific capacity (around 203 mAh•g-1 at 3.7V) at the cathode active material level, which is not provided with current commercially layered ternary oxide cathodes. Increasing the operating voltage is an effective method to improve the specific capacity of the cathode and the energy density of the battery, but the high operating voltage also causes a lot of problems, such as cation mixing and phase transformation, electrolyte decomposition, transition metal dissolution and microcracks. So far, researchers have carried out a lot of works to solve these issues. Surface coating, element doping and the design of electrolytes have been proved to be effective solutions. In this review, the failure mechanisms and modification methods of high-voltage layered ternary oxide cathode materials are summarized, which could provide valuable information to the research of high-voltage layered ternary oxide cathode materials in basic science and industrial production. Xiaodan Wang (top left) was born in Hebei province, China in 1996. She received her bachelor degree from Hebei University of Technology in 2018. She is currently studying for her master's degree under the guidance of Professor Bai in School of Materials Science at Beijing Institute of Technology. Ying Bai (top right) is currently a professor at Beijing Institute of Technology (BIT). Her research interests focus on electrochemical energy storage and conversion technology. Dr. Bai earned her bachelor degree from Applied Chemistry Division at Harbin Institute of Technology, China (HIT) in 1997. She completed her Ph.D. from School of Chemical Engineering & Materials Science at BIT in 2003. In 2013, she was awarded New Century Excellent Talents in University from the Chinese Ministry of Education. She hosted and is hosting the projects of the National Natural Science Foundation of China as a principal investigator. Dr. Bai has authored/co-authored more than 120 peer-reviewed articles and filed more than 40 Chinese patents. Xinran Wang (bottom left) is an associate researcher at Beijing Institute of Technology (BIT). His research interests focus on new system for high energy density secondary batteries. In 2016, he received his Ph.D. degree in University of Chinese Academy of Sciences. From 2013 to 2015, he was jointly trained by Georgia Institute of Technology in the United States. From 2016 to 2018, he worked as an assistant researcher at the Institute of Process Engineering, Chinese Academy of Sciences. He has won the Baosteel Award, the President's Award of the Chinese Academy of Sciences, the Chinese Academy of Sciences Outstanding pacesetter and so on. Chuan Wu (bottom right) is a professor at Beijing Institute of Tech...

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Understanding the combined effects of microcrystal growth and band gap reduction for Fe(1−)Ti F3 nanocomposites as cathode materials for lithium-ion batteries

Cited by 64 publications

References 57 publications

Improved Electrochemical Performance of FeF₃ by Inlaying in a Nitrogen‐Doped Carbon Matrix

Improved Electrochemical Performance of FeF₃ by Inlaying in a Nitrogen‐Doped Carbon Matrix

3D Hierarchical nano-flake/micro-flower iron fluoride with hydration water induced tunnels for secondary lithium battery cathodes

High‐Voltage Layered Ternary Oxide Cathode Materials: Failure Mechanisms and Modification Methods^†

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Understanding the combined effects of microcrystal growth and band gap reduction for Fe(1−)Ti F3 nanocomposites as cathode materials for lithium-ion batteries

Cited by 64 publications

References 57 publications

Improved Electrochemical Performance of FeF3 by Inlaying in a Nitrogen‐Doped Carbon Matrix

Improved Electrochemical Performance of FeF3 by Inlaying in a Nitrogen‐Doped Carbon Matrix

3D Hierarchical nano-flake/micro-flower iron fluoride with hydration water induced tunnels for secondary lithium battery cathodes

High‐Voltage Layered Ternary Oxide Cathode Materials: Failure Mechanisms and Modification Methods†

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Improved Electrochemical Performance of FeF₃ by Inlaying in a Nitrogen‐Doped Carbon Matrix

Improved Electrochemical Performance of FeF₃ by Inlaying in a Nitrogen‐Doped Carbon Matrix

High‐Voltage Layered Ternary Oxide Cathode Materials: Failure Mechanisms and Modification Methods^†