Achieving high gravimetric energy density for flexible lithium-ion batteries facilitated by core–double-shell electrodes

Balogun, Muhammad‐Sadeeq; Yang, Hao; Luo, Ying; Qiu, Weitao; Huang, Yongchao; Liu, Zhao‐Qing; Tong, Yexiang

doi:10.1039/c8ee00522b

Cited by 220 publications

(130 citation statements)

References 63 publications

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“…The occupational disorder of Ti 4+ is conducive to provide fast transfer channels for Li‐ions, leading to the high‐rate capability and outstanding cyclability of CT‐rGO@LTO. For the spectra of O 1s (Figure d), the binding energy of the peak identified as O I (531.3 eV) for pure LTO decreases to 530.6 eV (CM‐rGO@LTO, CT‐rGO@LTO), which is caused by the redistribution of O charge . It is worth mentioning that the peak specified as O II (532.5 eV) in the O 1s spectra of CM‐rGO@LTO and CT‐rGO@LTO is assigned to the oxygen vacancy, while the peak of O II for pure LTO is not obvious .…”

Section: Resultsmentioning

confidence: 95%

“…It is worth mentioning that the peak specified as O II (532.5 eV) in the O 1s spectra of CM‐rGO@LTO and CT‐rGO@LTO is assigned to the oxygen vacancy, while the peak of O II for pure LTO is not obvious . The CT‐rGO@LTO composite has the strongest peak intensity of O II , revealing the existence of more oxygen vacancies, which lead to the changes in the electronic state of the “pomegranate‐like” sample . Additionally, electron spin resonance (EPR) measurements were exploited to provide strong evidence for exploring oxygen vacancies (Figure e).…”

Section: Resultsmentioning

confidence: 99%

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Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Meng

et al. 2019

Small Methods

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Rational design of nanostructured electrode materials is highly desired for developing high‐performance lithium‐ion batteries (LIBs). Encapsulating electrode materials in reduced graphene oxide (rGO) shows great potential for manipulation of physicochemical properties at the atomic level, promoting remarkable electrochemical properties. Here, a controllable strategy is proposed to synthesize a “pomegranate‐like” 3D rGO encapsulated lithium titanate composite (CT‐rGO@LTO). The experimental results demonstrate the enriched oxygen vacancies in LTO and the electronic interactions at the interface between LTO and rGO. Density functional theory (DFT) calculations confirm the charge redistribution in the CT‐rGO@LTO composite, establishing a strong electric field with oxygen vacancies. Furthermore, the extra active sites in rGO for Li‐ion storage are investigated via in situ Raman tests. Benefiting from the oxygen vacancies and the electric‐field effect, the CT‐rGO@LTO electrode delivers excellent cycling stability with a capacity retention of 87.1% after 1500 cycles at 5 C. Moreover, the CT‐rGO@LTO electrode is adopted to assemble a full cell with a LiCoO2 cathode, which also displays superior rate capability with capacities of 139.4 and 109.7 mA h g−1 at 0.5 and 10 C, respectively. This work provides profound insights of fabricating high‐performance electrode materials for advanced energy storage.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Meng

et al. 2019

Small Methods

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“…It can be found that, in most cases, the as‐obtained high energy density for these NICs is usually accompanied by significant power losses. In addition, most reported electrode materials of NICs are typical in the form of powders, which need conductive agents (such as super P) and polymer binders (such as polyvinylidene difluoride (PVDF)) on the traditional copper/aluminum foils . To construct flexible NICs for next‐generation wearable electronics, the general strategy is to directly grow Na‐storage materials on flexible substrates .…”

Section: Introductionmentioning

confidence: 99%

Mesopore‐Induced Ultrafast Na⁺‐Storage in T‐Nb₂O₅/Carbon Nanofiber Films toward Flexible High‐Power Na‐Ion Capacitors

Wang

et al. 2019

Small

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Hybrid Na‐ion capacitors (NICs) are receiving considerable interest because they combine the merits of both batteries and supercapacitors and because of the low‐cost of sodium resources. However, further large‐scale deployment of NICs is impeded by the sluggish diffusion of Na+ in the anode. To achieve rapid redox kinetics, herein the controlled fabrication of mesoporous orthorhombic‐Nb2O5 (T‐Nb2O5)/carbon nanofiber (CNF) networks is demonstrated via in situ SiO2‐etching. The as‐obtained mesoporous T‐Nb2O5 (m‐Nb2O5)/CNF membranes are mechanically flexible without using any additives, binders, or current collectors. The in situ formed mesopores can efficiently increase Na+‐storage performances of the m‐Nb2O5/CNF electrode, such as excellent rate capability (up to 150 C) and outstanding cyclability (94% retention after 10 000 cycles at 100 C). A flexible NIC device based on the m‐Nb2O5/CNF anode and the graphene framework (GF)/mesoporous carbon nanofiber (mCNF) cathode, is further constructed, and delivers an ultrahigh power density of 60 kW kg−1 at 55 Wh kg−1 (based on the total weight of m‐Nb2O5/CNF and GF/mCNF). More importantly, owing to the free‐standing flexible electrode configuration, the m‐Nb2O5/CNF//GF/mCNF NIC exhibits high volumetric energy and power densities (11.2 mWh cm−3, 5.4 W cm−3) based on the full device, which holds great promise in a wide variety of flexible electronics.

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“…[1][2][3][4][5] At present, graphite is the most widely studied and used as commercial anode material, but its low specific capacity (theoretically 372 mAh g À 1 ) is difficult to meet with the development of high-performance LIBs. [1][2][3][4][5] At present, graphite is the most widely studied and used as commercial anode material, but its low specific capacity (theoretically 372 mAh g À 1 ) is difficult to meet with the development of high-performance LIBs.…”

Section: Introductionmentioning

confidence: 99%

Mn₂Sb₂O₇/Reduced Graphene Oxide Composites with High Capacity and Excellent Cyclic Stability as Anode Materials for Lithium‐Ion Batteries

Jiao

Zeng

et al. 2019

ChemElectroChem

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For the advancement of lithium-ion batteries (LIBs), metal oxides with high theoretical specific capacities have been explored as anodes. Herein, we report a new metal oxide, Mn 2 Sb 2 O 7 -anchored reduced graphene oxide (Mn 2 Sb 2 O 7 /RGO), as an advanced anode for LIBs. The Mn 2 Sb 2 O 7 /RGO anode exhibits a higher capacity and better capacity retention compared to Mn 2 Sb 2 O 7 , because the close contact between Mn 2 Sb 2 O 7 and RGO facilitates charge transfer during cycling.The discharge capacity of Mn 2 Sb 2 O 7 /RGO reaches 706.72 mAh g À 1 at 200 mA g À 1 after 200 cycles. Even at 1000 mA g À 1 , the capacity loss per cycle of Mn 2 Sb 2 O 7 /RGO is only 0.0344 % for 600 cycles, indicating an excellent high-rate cyclic stability compared to other Sb-based oxides. These results forecast that Mn 2 Sb 2 O 7 /RGO is a potential anode for LIBs, providing a new insight into the selection of high-performance anodes.

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Achieving high gravimetric energy density for flexible lithium-ion batteries facilitated by core–double-shell electrodes

Abstract: Core–double-shell electrodes were designed to achieve flexible LIBs with an applicable energy density of 314 mA h g−1 (based on the device weight).

Cited by 220 publications

References 63 publications

Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Mesopore‐Induced Ultrafast Na⁺‐Storage in T‐Nb₂O₅/Carbon Nanofiber Films toward Flexible High‐Power Na‐Ion Capacitors

Mn₂Sb₂O₇/Reduced Graphene Oxide Composites with High Capacity and Excellent Cyclic Stability as Anode Materials for Lithium‐Ion Batteries

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Achieving high gravimetric energy density for flexible lithium-ion batteries facilitated by core–double-shell electrodes

Abstract: Core–double-shell electrodes were designed to achieve flexible LIBs with an applicable energy density of 314 mA h g−1 (based on the device weight).

Cited by 220 publications

References 63 publications

Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Engineering of Oxygen Vacancy and Electric‐Field Effect by Encapsulating Lithium Titanate in Reduced Graphene Oxide for Superior Lithium Ion Storage

Mesopore‐Induced Ultrafast Na+‐Storage in T‐Nb2O5/Carbon Nanofiber Films toward Flexible High‐Power Na‐Ion Capacitors

Mn2Sb2O7/Reduced Graphene Oxide Composites with High Capacity and Excellent Cyclic Stability as Anode Materials for Lithium‐Ion Batteries

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Resources

About

Mesopore‐Induced Ultrafast Na⁺‐Storage in T‐Nb₂O₅/Carbon Nanofiber Films toward Flexible High‐Power Na‐Ion Capacitors

Mn₂Sb₂O₇/Reduced Graphene Oxide Composites with High Capacity and Excellent Cyclic Stability as Anode Materials for Lithium‐Ion Batteries