SOLID STATE IONICS
·
2017
·
IF 2.354
Zhi Zhou,Yiran Li,Mao Xia,Nan Zhou
In this paper, Li 1–x Ti 2 (PO 4 ) 3 /C composites (x = 0, 0.03, 0.05, 0.07) were synthesized by sol-gel approach, and the influence of Li vacancy on electrochemical performance of LiTi 2 (PO 4 ) 3 /C anode for aqueous rechargeable lithium battery was studied. Li vacancy hardly influences the crystal structure and morphology of the composite. Electrochemical measurement results demonstrated that Li 1–x Ti 2 (PO 4 ) 3 /C exhibited better performance compared with pristine LiTi 2 (PO 4 ) 3 /C, and Li 0.95 Ti 2 (PO 4 ) 3 /C has the best properties. Li 0.95 Ti 2 (PO 4 ) 3 /C delivered the discharge capacity of 104.3, 92.6, and 71.8 mAh g − 1 at 0.2, 5, and 20 C (1 C = 150 mA g − 1 ), 4.1, 27.3, and 34.4 mAh g − 1 larger than that of Li 0.95 Ti 2 (PO 4 ) 3 /C at corresponding rates, respectively. After 1000 cycles at 5 C, the discharge capacity retention for Li 0.95 Ti 2 (PO 4 ) 3 /C can reach 75.3%, 15.4% larger than that for LiTi 2 (PO 4 ) 3 /C. Our study reveals that Li vacancy is an efficient method to enhance the electrochemical properties of LiTi 2 (PO 4 ) 3 -based materials.
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DOI
高影响因子
SOLID STATE IONICS
·
2022
·
IF 3.699
Xu Zhang,Jinhua Wu,Shuqian Li,Yi Li,Xiaojie Li,Zhe Zhu,Jianlong Li
The vanadium-containing phosphate polyanion LiVPO 4 F has been attractive as a novel 4 V cathode for lithium-ion batteries. Herein, a hybrid cathode containing two active components of LiVPO 4 F and Li 3 V 2 (PO 4 ) 3 was successfully obtained by single-step solid-state reaction. The crystalline grains are coated by an amorphous carbon layer of about 8 nm thick. The composite presents reversible capacities of 102.8 and 98.2 mAh g −1 at the rates of 10C and 20C, respectively. Even at an ultrahigh rate of 100C (14.5 A g −1 ), it remains a discharge capacity of 70.1 mAh g −1 with a high average working potential of 3.5 V. After cycled 500 times at 10C, the obtained sample shows a capacity retention of 78.6%, implying outstanding cycling performance. The electrochemical impendence spectroscopy demonstrates that the hybrid cathode delivers higher lithium-ion diffusion coefficient . It is believed that the electrochemical performance is enhanced synergistically by the in-situ generated ionic conductor of Li 3 V 2 (PO 4 ) 3 . Finally, when charged and discharged at around 4.1 V, the intermediate phase of Li x VPO 4 F is clearly revealed by CV tests, which likely derives from a symmetry phase transform mechanism.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Cong Wang,Jieying Xiu,Kunxi Lü,Yafeng Li,Mingdeng Wei
Na super-ion conductor type material Na 3 V 2 (PO 4 ) 3 has been widely researched as the cathode of sodium-ion batteries (SIBs) in recent years, but the unsatisfying cost of Na 3 V 2 (PO 4 ) 3 impedes its wide application in SIBs. In this study, iron element is used to replace part of vanadium in Na 3 V 2 (PO 4 ) 3 to reduce its expense, and pine pollen is applied for the first time as a very effective carbon source to improve the performance of Na 4 FeV(PO 4 ) 3 . The fabricated composite material achieves a capacity of 105 mA h g −1 under 0.2 C and fascinating cycling stability over 94 % under 2 C for 500 cycles and 98 % under 10 C for 1000 cycles. The excellent cycle performance is caused by the involvement of pine pollen that acts as a carbon matrix to enhance the electron conductivity and block the agglomeration of active material effectively, thus the well-dispersed nano sized Na 4 FeV(PO 4 ) 3 shortens the diffusion path of sodium ion and gains a remarkable rate capability. Moreover, the distinguished reversibility during the charge and discharge procedures is ascribed also to the robust structure of Na 4 FeV(PO 4 ) 3 . This work provides an efficient route to realize the economic cathode material of SIBs with good performance.
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Changzhi Sun,Xiao Huang,Jun Jin,Yang Lu,Qing Wang,Jianhua Yang,Zhaoyin Wen
Lithium (Li) metal plays an indispensable role in Li-S batteries , but its fast degradation seriously impedes the practical application of Li-S batteries. Here, an ion-conductive LAGP-based composite protective layer (CPL) consisting of lithium aluminum germanium phosphate (Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 ) and polyvinylidene fluoride (PVDF) is prepared on Li metal anode via a facile casting method. In the presence of LAGP, the negative effect of CPL on the diffusion of Li + is minimized. Hence, it can not only effectively resist corrosive action of lithium polysulfides (LiPSs) on Li metal anode, but also reduce interfacial polarization and restrain dendritic Li growth. The protected Li anode exhibits exceptional cycling stability and low voltage polarization (∼30 mV at 0.5 mA cm −2 ) for 300 h. The electrochemical performance of Li-S batteries with protected Li anode is also greatly enhanced. The discharge specific capacity of 832.1 mAh g −1 and an average coulombic efficiency of 92% are obtained for up to 100 cycles at 0.5 C in LiNO 3 -free electrolyte. Additionally, the rate capability of Li-S batteries is significantly improved, delivering a reversible capacity of 565 mAh g −1 at 4 C. Our results also indicate this protection strategy can be extended to the Li-S pouch cells.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yue Jiang,Zhiwei Hu,Qiaohong Yan,Xiaohong Zhu
All-solid-state lithium batteries have great potential applying to the fields of transportation and portable devices because of their high safety and energy density as the power source. As a critical component of device, solid-state electrolyte has been paid much attention. Given the excellent physical and chemical stability, Li 1+ x Al x Ti 2- x (PO 4 ) 3 (LATP)-based electrolyte has been considered as one of the most promising electrolytes for the next generation batteries. However, a further promotion of its ionic conductivity becomes extremely difficult, originating mainly from the poor connection of grains and a low relative density of LATP. Here, the nanosized and homogenous LATP ( x = 0.3) powders were synthesized through reducing the agglomeration of precursor powders and preparing at low temperatures. It is revealed that uniformly superfine LATP powders are able to improve the microstructure of grain boundaries during the pellet sintering process, thereby reducing the grain boundary resistance. Furthermore, as-synthesized nanosized powders mixed with Bi 2 O 3 additive present a better enhancement on the connection of grains and the relative density in LATP. On the basis of this understanding, we prepared LATP electrolytes with 0.5 wt% Bi 2 O 3 exhibiting a high ionic conductivity of 8.56 × 10 −4 S/cm, a high relative density of 94.4 % and a low activation energy of 0.27 eV, which is demonstrated as a prospective electrolyte in all-solid-state lithium battery LiFePO 4 /PEO/LATP/PEO/Li.
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DOI
高影响因子
Energy & Environmental Materials
·
2022
·Vol. 6
·期 6
·e12531
·
IF 13.443
Tian Gu,Likun Chen,Yanfei Huang,Jiabin Ma,Peiran Shi,Jie Biao,Ming Liu,Wei Lv,Yanbing He
The poor contact and side reactions between Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) and lithium (Li) anode cause uneven Li plating and high interfacial impendence, which greatly hinder the practical application of LATP in high-energy density solid-state Li metal batteries. In this work, a multifunctional ferroelectric BaTiO 3 (BTO)/poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene) (P[VDF-TrFE-CTFE]) composite interlayer (B-TERB) is constructed between LATP and Li metal anode, which not only suppresses the Li dendrite growth, but also improves the interfacial stability and maintains the intimate interfacial contact to significantly decrease the interfacial resistance by two orders of magnitude. The B-TERB interlayer generates a uniform electric field to induce a uniform and lateral Li deposition, and therefore avoids the side reactions between Li metal and LATP achieving excellent interface stability. As a result, the Li/LATP@B-TERB/Li symmetrical batteries can stably cycle for 1800 h at 0.2 mA cm −2 and 1000 h at 0.5 mA cm −2 . The solid-state LiFePO 4 /LATP@B-TERB/Li full batteries also exhibit excellent cycle performance for 250 cycles at 0.5 C and room temperature. This work proposes a novel strategy to design multifunctional ferroelectric interlayer between ceramic electrolytes and Li metal to enable stable room-temperature cycling performance.
研究领域:
材料科学
·
电化学
·
储能技术
·
固态电池
·
铁电材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Na Liu,Zhangxing He,Xubo Zhang,Yingqiao Jiang,Yuehua Li,Jing Zhu,Wei Meng,Lei Dai,Ling Wang
In this paper, Li 1−x Na x Ti 2 (PO 4 ) 3 @carbon (x=0.01, 0.03, and 0.05) composites as anode for aqueous lithium ion batteries were synthesized by in situ coating approach. The doping of Na on Li sites did not break the lattice structure of LiTi 2 (PO 4 ) 3 , while the lattice volume was increased by doping of Na. Among Na-doped LiTi 2 (PO 4 ) 3 @carbon composites, Li 0.97 Na 0.03 Ti 2 (PO 4 ) 3 @carbon (LC-Na-3) demonstrated the best electrochemical properties . Compared with the pristine LiTi 2 (PO 4 ) 3 @carbon (LC) composite, LC-Na-3 composite exhibited better rate and cycling performance. LC-Na-3 composite delivered the discharge capacity of 98.5 mAh g −1 at 0.2 C and 45.0 mAh g −1 at 15 C, 10.9 mAh g −1 and 32.1 mAh g −1 larger than that of LC composite, respectively. Moreover, the discharge capacity retention for LC-Na-3 composite achieved 90.4%, 6.9% higher than that for LC composite at the rate of 2 C after 300 cycles. The improved electrochemical properties of Na-doped LiTi 2 (PO 4 ) 3 @carbon composite was ascribed to the decrease of charge transfer resistance and the acceleration of diffusion of lithium ions , resulting from the widening of diffusion channel for lithium ions, which was verified by XRD measurements.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Pengfei Wang,Lianyi Shao,Haoxiang Yu,Jinping Dong,Ting-Feng Yi,Shangshu Qian,Lei Yan,Peng Li,Miao Shui,Jie Shu
In this work, we propose a facile solid state reaction to prepare Li 3-x Na x V 2 (PO 4 ) 3 /C (0 ≤ x ≤ 3), which are rarely explored as possible cathode materials in sodium-ion batteries. Their phase composition, surface morphology and electrochemical property are described and compared in detail by using various physical/chemical methods. Seen from phase analysis results, it is known that Li 2.5 Na 0.5 V 2 (PO 4 ) 3 is a three-phase mixture (monoclinic Li 3 V 2 (PO 4 ) 3 , rhombohedral Li 3 V 2 (PO 4 ) 3 and rhombohedral Na 3 V 2 (PO 4 ) 3 ). In contrast, Li 2 NaV 2 (PO 4 ) 3 , Li 1.5 Na 1.5 V 2 (PO 4 ) 3 , LiNa 2 V 2 (PO 4 ) 3 and Li 0.5 Na 2.5 V 2 (PO 4 ) 3 are two-phase mixtures consisting of rhombohedral Na 3 V 2 (PO 4 ) 3 and rhombohedral Li 3 V 2 (PO 4 ) 3 . Evaluated as cathode materials in half-cells, Li 3-x Na x V 2 (PO 4 ) 3 /C (0 ≤ x ≤ 3) can deliver the initial reversible capacities of 94.3 mAh g −1 (x = 0.0), 103.6 mAh g −1 (x = 0.5), 115.1 mAh g −1 (x = 1.0), 112.7 mAh g −1 (x = 1.5), 99.6 mAh g −1 (x = 2.0), 94.0 mAh g −1 (x = 2.5) and 91.9 (x = 3.0) mAh g −1 , respectively. After 45 cycles, the reversible capacities of 88.9 mAh g −1 (x = 0.0), 88.2 mAh g −1 (x = 0.5), 80.6 mAh g −1 (x = 1.0), 99.6 mAh g −1 (x = 1.5), 87.2 mAh g −1 (x = 2.0), 72.7 mAh g −1 (x = 2.5) and 72.3 mAh g −1 (x = 3.0) can be still kept for these samples. The electrochemical results suggest that Li/Na co-existence in M 3 V 2 (PO 4 ) 3 /C may be beneficial to enhance the electrochemical performance . As a result, Li 1.5 Na 1.5 V 2 (PO 4 ) 3 /C shows the best sodium storage capability as cathode material in sodium-ion batteries.
研究领域:
材料科学
·
电化学
·
储能
✓ 已验证
DOI
高影响因子
SOLID STATE IONICS
·
2017
·
IF 2.354
Xujiao Yang,Kaiying Wang,Xianli Wang,Guangli Chang,Siao Sun
NASICON-type NaTi 2 (PO 4 ) 3 material has been extensively studied as a promising anode for sodium-ion batteries due to the open 3D framework with the large interstitial spaces, high theoretical capacity and small volume change during cycling process. However, the practical application of NaTi 2 (PO 4 ) 3 is hampered because of its low electronic conductivity . Herein, a simple approach along with post-annealing has been designed and adopted to prepare the carbon-coated NaTi 2 (PO 4 ) 3 (NaTi 2 (PO 4 ) 3 @C) composite. The as-prepared anode material is characterized by XRD , SEM, TEM and Raman spectrum . The electrochemical measurements reveal that NaTi 2 (PO 4 ) 3 @C has excellent Na-storage performances including high reversible capacity (112.6 mAh g − 1 at 0.2 C) and good rate capability (87.1 mAh g − 1 at 5 C). The superior electrochemical performance can be resulted from the synergistic effects of the nanosized NaTi 2 (PO 4 ) 3 particles and conductive carbon layer .
研究领域:
材料科学
·
电化学
·
储能
✓ 已验证
DOI
高影响因子
Journal of Hazardous Materials Advances
·
2026
·
IF 9.1
Jiawei Li,Gaiyuan Chen,Min Chen,Zhengxin Wu,Yong Liu
Uranium (U) tailings, generated as byproducts of U mining and milling, pose significant disposal challenges owing to their large volume, radiotoxicity, and chemically heterogeneous mineral composition. Herein, we report a microwave–assisted route for preparing (1– x )Sr 0.5 Zr 2 (PO 4 ) 3 – x CePO 4 ( x = 0, 0.2, 0.4, 0.6, 0.8, 1) [strontium zirconium phosphate(SZP)–cerium phosphate(CP)] composite ceramics while incorporating real U tailings as a Si/Al–rich secondary waste component. The raw–batch U–tailing loading was 39.7–47.0 wt% for the designed compositions and 45.4 wt% for the optimized SZP–CP–0.8 batch. Compared with reagent–derived SZP–CP systems, the present work focuses on the practical utilization and stabilization of actual U tailings during ceramic waste−form preparation. The phase assemblage, microstructure, density, Vickers hardness, Ce surface valence, and 42–day PCT chemical durability were evaluated. The optimized SZP–CP–0.8 ceramic exhibited a density of 4.32 g ·cm –3 , a porosity of 0.12%, and low normalized leaching rates after 42 days, with Sr, P, and Si of approximately 10 −4 g ·m −2 ·d −1 , Ce of approximately 10 –7 g ·m –2 ·d –1 , and Zr of approximately 10 –8 g ·m –2 ·d –1 , supporting the feasibility of microwave–sintered SZP−CP composites for treatment and disposal of U tailings and simulated divalent/tetravalent radionuclides. Quantitative phase refinement, statistically representative grain–size analysis, replicate–vessel leaching uncertainty, and radionuclide–specific leaching of native trace elements from tailings are identified as future work rather than over interpreted from the present dataset.
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DOI
高影响因子
ACS Applied Energy Materials
·
2019
·
IF 0
Jing Yang,Zhen Huang,Peng Zhang,Gaozhan Liu,Xiaoxiong Xu,Xiayin Yao
Developing solid electrolytes with high lithium-ion conductivity is crucial to realize high-performance all-solid-state lithium batteries. The substitution of ions with larger ionic radius can enlarge the Li+ migration tunnels and therefore enhance the lithium-ion conductivity. In this work, Ti4+ is employed to partially replace Ge4+ in Li2O–Al2O3–GeO2–P2O5 glass-ceramics electrolyte in order to improve its conductivity. The highest total lithium-ion conductivity of 1.07 × 10–3 S cm–1 at room temperature is obtained from Li1.5Al0.5Ge1.5(PO4)3-7.5 wt % TiO2 sample sintered at 900 °C for 6 h. The bulk and grain boundary conductivities are 1.67 × 10–3 S cm–1 and 2.99 × 10–3 S cm–1, respectively, which are superior than that of the pristine Li1.5Al0.5Ge1.5(PO4)3 counterpart. Both bulk and grain boundary conductivities of the sample have been significantly improved, which could be attributed to the increase of bottleneck sizes of the Li+ migration tunnels and the decrease of grain boundary area. All-solid-state lithium batteries employing LiFePO4 as cathode and solid electrolyte as separator and ionic conductor are assembled. A reversible capacity of 132.3 mAh g–1 is delivered after 200 cycles under a current density of 0.1C with a capacity retention ratio of 91.1%, showing the solid electrolyte is ideal for all-solid-state lithium-battery applications.
研究领域:
材料科学
·
固体离子学
·
储能技术
·
电化学
·
陶瓷与玻璃
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DOI
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Nan Jiang,Long Chen,Yitao Wang,Hao Jiang,Yanjie Hu,Chunzhong Li
Sodium-ion batteries have been extensively studied due to their high safety and high natural abundance characteristics. Na 3 V 2 (PO 4 ) 3 (NVP) cathode materials, which have extraordinary rate performance and cycle stability, have become among the most promising cathode materials for commercialization. However, due to their low conductivity problem, it is still a serious challenge to develop a nanocrystalline and uniform conductive frame structure. This work reports a confinement reaction strategy derived from the chelation reaction, which can successfully realize electrode materials with adjustable internal NVP grains. The obtained ultrasmall grained carbon frame material showed to have ultrahigh rate performance, and it could reach 101 mAh g −1 at 100C and 100 mA h g −1 after 1800 cycles at 10C rate (capacity retention rate 99%). Moreover, it showed the characteristics of excellent low-temperature performance, and no capacity degradation at − 20 °C after 1000 cycles.
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高影响因子
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