ELECTROCHIMICA ACTA
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2017
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IF 4.798
Yanyan Kong,Jiaxiang Sun,Ligang Gai,Xiaojuan Ma,Jianhua Zhou
Aqueous rechargeable batteries (ARBs) based on migration of two types of shuttle ions not only enrich the battery families but also make it more available for ARBs with operation potential higher than 1.2 V. In this paper, we report on electrochemical properties of ARBs in configuration of NaTi 2 (PO 4 ) 3 /C||LiMn 2 O 4 , i.e. NTP/C||LMO. NTP/C was prepared through a simple and scalable co-precipitation post annealing treatment method and featured with hierarchical structure, high specific surface area, and abundant mesopores. The electrochemical properties of individual anode and cathode were examined in 1 mol L −1 Li 2 SO 4 , 1 mol L −1 Na 2 SO 4 , and 0.5 mol L −1 Li 2 SO 4 /0.5 mol L −1 Na 2 SO 4 mixed electrolyte, respectively. It is found that NTP/C exhibits superior operation in 1 mol L −1 Na 2 SO 4 and inferior operation in 1 mol L −1 Li 2 SO 4 while the situation is contrary for LMO. However, NTP/C||LMO full cells with Li + /Na + -mixed electrolyte exhibit enhanced electrochemical performance, presenting an anode-dependant electrochemical behavior. When operating at 1C, NTP/C||LMO with Li + /Na + -mixed electrolyte can deliver a discharge specific capacity ( C dis ) of 104.6 mA h g −1 based on the weight of NTP/C, and a specific energy ( E cell ) of 59.5 W h kg −1 with corresponding specific power of 76.8 W kg −1 based on the total weight of active electrode materials. After 220 cycles at 1C, the C dis and E cell remain 75.7 mA h g −1 and 43.0 W h kg −1 , respectively.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
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2018
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IF 8.097
Peng Wei,Yanxiang Liu,Zhihao Wang,Yangyang Huang,Yu Jin,Yi Liu,Shixiong Sun,Yuegang Qiu,Jian Peng,Yue Xu,Xueping Sun,Chun Fang,Jiantao Han,Yunhui Huang
NaTi2(PO4)3 (NTP) with a sodium superionic conductor three-dimensional (3D) framework is a promising anode material for sodium-ion batteries (SIBs) because of its suitable potential and stable structure. Although its 3D structure enables high Na-ion diffusivity, low electronic conductivity severely limits NTP’s practical application in SIBs. Herein, we report porous NTP/C nanofibers (NTP/C-NFs) obtained via an electrospinning method. The NTP/C-NFs exhibit a high reversible capacity (120 mA h g–1 at 0.2 C) and a long cycling stability (a capacity retention of ∼93% after 700 cycles at 2 C). Furthermore, sodium-ion full cells and hybrid sodium-ion capacitors have also been successfully assembled, both of which exhibit high-rate capabilities and remarkable cycling stabilities because of the high electronic/ionic conductivity and impressive structural stability of NTP/C-NFs. The results show that the nanoscale-tailored NTP/C-NFs could deliver new insights into the design of high-performing and highly stable anode materials for room-temperature SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE IONICS
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2018
·
IF 2.751
Zhen Jiang,Lu Liu,Yuehua Li,Jing Zhu,Chuanchang Li,Zhangxing He,Wei Meng,Yingqiao Jiang,Lei Dai,Ling Wang
NaTi 2 (PO 4 ) 3 /C (NC) composites decorated by carbon nanotubes (CNTs) were prepared via a sol-gel way, and employed as anode in aqueous lithium ion batteries . An effective conductive network was obtained by decoration of CNTs, which can interconnect NC particles. CNTs decoration has no obvious effect on lattice structure for NaTi 2 (PO 4 ) 3 , and can enhance electrochemical properties for NC. Moreover, NC decorated by CNTs with optimal content of 8.8% (NC-CNTs-10) exhibits the highest electrochemical properties. NC-CNTs-10 delivers the discharge capacity of 96.4, 93.7, and 74.2 mAh g −1 at 0.5, 3, and 15C, respectively, with increase of 2.7, 15.1, and 38.2 mAh g −1 compared with NC. In addition, NC-CNTs-10 shows excellent cycling performance. Capacity retention for NC-CNTs-10 can reach 91.2% after 1000 cycles at a rate of 4C, 16.7% larger than that of pristine NC. Our study reveals that CNTs decoration is a simple way to raise electrochemical properties for NaTi 2 (PO 4 ) 3 /C in aqueous lithium ion batteries .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Peng Wei,Yanxiang Liu,Yarui Su,Ling Miao,Yangyang Huang,Yi Liu,Yuegang Qiu,Yuyu Li,Xiaoyu Zhang,Yue Xu,Xueping Sun,Chun Fang,Qing Li,Jiantao Han,Yunhui Huang
We are presenting a sol–gel method for building novel nanostructures made of nanosized F-doped Na1–2xTi2(PO4)3–xFx (NTP-Fx, x = 0, 0.02, 0.05, and 0.10) particles embedded in three-dimensional (3D) carbon matrices (NTP-Fx/C). This technique combines advantages of both zero-dimensional materials and 3D-carbon networks. Proper fluorine doping stabilizes the NTP structure and greatly enhances ion/electron transportation, leading to superhigh-rate electrochemical performance and ultralong cycle life. The composite electrode delivers high specific capacities of 121, 115, 112.2, 110.1, 107.7, 103.1, 85.8, and 62.5 mA h g–1 at 0.2, 0.5, 1, 2, 5, 10, 20, and 30 C, respectively. It retains an unbelievable ∼70% capacity after a thousand cycles at a rate as high as 10 C. Electroanalytical results reveal that fluorine doping significantly enhances Na+ diffusion kinetics. Meanwhile, density functional theory calculations demonstrate F-doped NTPs’ own outstanding electrochemical properties, which is due to the enhanced intrinsic ionic/electronic conductivity. The results show that anion doping is an efficient way to make high-performance NTP anodes for sodium-ion batteries.
研究领域:
电化学
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材料科学
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能源存储
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纳米材料
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固态化学
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电化学储能
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
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IF 3.218
Dongxue Luo,Ping Lei,Yunxuan Huang,Guorong Tian,Xingde Xiang
Rechargeable aqueous sodium-ion batteries (SIBs) are urgently pursued as a low-cost candidate for grid-scale storage of intermittent renewable energies. NASICON-type NaTi 2 (PO 4 ) 3 holds great promises as anode material for aqueous SIBs owing to the high theoretical capacity and low redox potential , but being severely challenged by poor cycling performance and low reaction kinetics. Herein, graphene-integrated NaTi 2 (PO 4 ) 3 /C composite is prepared with a facile sol-gel approach as anode material for aqueous SIBs. Electrochemical properties of the material in high-concentration aqueous electrolyte (6 M NaClO 4 ) are systematically investigated by using cycling voltammetry , galvanostatic technique and electrochemical impedance spectroscopy . It is found that it shows an improved charge/discharge performance with a high practical capacity of 104.6 mAh g −1 at 100 mA g −1 , excellent high-rate capability with a reversible capacity of 88.0 mAh g −1 at 2000 mA g −1 , and good cycling stability with 92% capacity retention after 100 cycles. The improved electrochemical performance is attributed to the synergetic contribution of carbon-blending nanostructure and high-concentration electrolyte, which largely enhances structural stability and reaction kinetics of the material. In addition, the redox mechanism is discussed based on experimental results from cyclic voltammetry and X-ray diffraction technique.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）