Unravelling binder chemistry in sodium/potassium ion batteries for superior electrochemical performances

Wang, Chunting; Su, Long; Wang, Nana; Lv, Dan; Wang, Dongdong; Yang, Jian; Qian, Yitai

doi:10.1039/d1ta09516a

Cited by 30 publications

(16 citation statements)

References 44 publications

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“…To solve this problem, the electrolyte solvent of EC/DEC was replaced by DGM, which is an ether solvent, to restrict the decomposition of the electrode in the first cycle. 30 Furthermore, the different kinds of sodium salts such as NaClO 4 , NaOTf, and NaPF 6 were also tested to choose the best compatible one. Eventually, the iCE was improved to the higher value of 54.7−60.5% for all the three samples using ether-based electrolytes, as shown in Figure 4c.…”

Section: Resultsmentioning

confidence: 99%

Significant Enhancement in the Electrochemical Performances of a Nanostructured Sodium Titanate Anode by Molybdenum Doping for Applications as Sodium-Ion Batteries

Chandel

Wang

Singh

et al. 2022

ACS Appl. Nano Mater.

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Sodium titanate is considered as one of the most promising anode materials for sodium-ion batteries without any serious safety concerns due to its high theoretical capacity at sufficiently low voltage. However, its low electrical conductivity severely restricts the electrochemical performances as an anode for sodium-ion batteries. Because suitable doping is always found to be a trump card strategy to especially enhance the conductivity, a molybdenum-doped sodium titanate nanostructured anode was successfully synthesized for the first time using the solvothermal method. Molybdenum-doped sodium titanate electrode materials showed superior electrochemical performances than the pristine sample. On more precise consideration, the sodium titanate electrode doped with 15 wt % molybdenum not only delivers ∼24% high reversible capacity at a high current density of 1 A g–1 in comparison to the pure sodium titanate electrode but also maintains it until 2500 cycles. It is believed that the improved electrochemical performances are mainly contributed by the combination of enhanced electrical conductivity and oxygen vacancy generated in the sodium titanate framework as a result of molybdenum doping. Molybdenum doping may also allow Na+ ion diffusion through multiple pathways within the sodium titanate crystal lattice and increase the transport rate of Na+ ions.

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Section: Resultsmentioning

confidence: 99%

Significant Enhancement in the Electrochemical Performances of a Nanostructured Sodium Titanate Anode by Molybdenum Doping for Applications as Sodium-Ion Batteries

Chandel

Wang

Singh

et al. 2022

ACS Appl. Nano Mater.

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“…Equivalent fitting results indicate that the PC-900-PVdF electrode exhibits a larger SEl film resistance (R SEI ) of 711.7−484.5 Ω than PC-900-CMC, further indicating more by-reactions and thicker SEI films (Figure 4b, Table S2). 49 Specific chemical constituents in the SEI film of cycled PC-900 anodes with different binders were analyzed by XPS (Figure 4c,d). 50 It can be seen that the C 1s spectra of the two electrodes are similar.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Integrated Design from Microstructural Engineering to Binder Optimization Enabling a Practical Carbon Anode with Ultrahigh ICE and Efficient Potassium Storage

Yan

Ren

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Potassium-ion batteries (PIBs) are emerging as a powerful alternative to lithium-ion battery systems in large-scale energy storage owing to plentiful resources. Nevertheless, pursuing high-yield anode materials with high initial Coulombic efficiency (ICE) and superior rate capability is still one of the most critical challenges in practical application. Herein, an integrated electrode (PC-x) derived from a petroleum coke precursor (carbon residue rate as high as 89%) is regulated from microstructural engineering to binder optimization devoting to high ICE and efficient potassium storage. Excitingly, with a strong assist from a sodium carboxymethyl cellulose (CMC) binder, the PC-900 anode displays an ultrahigh ICE of 80.5%, one of the highest values reported for PIB carbon anodes. Simultaneously, the PC-900 anode submits a high capacity (304.3 mAh g–1), superb rate (138.2 mAh g–1 at 10C), and excellent stability. Furthermore, the full cell exhibits an outstanding rate and cycling performance (210.7 mAh g–1 at 0.5C), confirming its large-scale application prospects. The ultrahigh ICE and excellent performance are mainly attributable to the beneficial microstructures (low surface area, functional group content, and larger interlayer spacing) created by microstructural engineering. Meanwhile, binder optimization also plays a crucial role in reducing the irreversible capacity and interface impedance, further improving the ICE and rate capability. Importantly, mechanism analysis confirms two-stage K+ storage behavior: reversible adsorption at edges and defects (>0.25 V) and intercalation into crystalline layers (<0.25 V). This work provides an efficient and easily scalable electrode design strategy for future practical applications of PIBs.

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“…When the above considerations are combined, TiO 2 can be introduced as a supplementary protecting layer, which suffers nearly zero volume change when it is inserted with Li + /Na + ions and could have strong binding affinity to many metal-based materials, making it a suitable coating shell or backbone for electrode modifications. − As a result, a double-shell design with both carbon and TiO 2 components has been put forward. , A recent report showed the preparation of Sb@C@TiO 2 triple-shell nanoboxes, and they exhibited an enhanced sodium storage performance, better than that of the Sb@C box-in-box structures . Another recent report presented that yolk/double-shelled SiO x @TiO 2 @C nanospheres have an outstanding lithium-ion battery performance .…”

Section: Introductionmentioning

confidence: 99%

Double-Enhanced Core–Shell–Shell Sb₂S₃/Sb@TiO₂@C Nanorod Composites for Lithium- and Sodium-Ion Batteries

Zhang

Liu

et al. 2022

ACS Appl. Mater. Interfaces

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For most alloying- and conversion-type anode materials, a huge volume expansion and structure degradation of the electrodes always hinder their applications. In this work, a novel core–shell–shell Sb2S3/Sb@TiO2@C nanorod composite has been designed layer by layer, which includes an inner Sb2S3/Sb heterostructure core protected by an oxygen-deficient TiO2 shell and a conductive carbon shell. It is interesting to observe that, during the carbothermic reduction process, the previous Sb2S3 nanorod cores are partially reduced into a metallic Sb phase and the reduced TiO2 also creates many oxygen vacancies, which can greatly enhance the conductivity of the semiconductor Sb2S3. Thanks to the double effects of the TiO2 middle shell and carbon outer shell, the unique double-shelled structure design creates an enhanced dual protection, which can better accommodate the volume-expansive deformation and preserve the structural integrity of the active Sb2S3/Sb core. Especially, the TiO2 middle layer is self-assembled by numerous nanoparticles acting as a nanopillar backbone, which supports between the nanorod core and outer carbon shell to better buffer the volume changes. As a result, the core–shell–shell Sb2S3/Sb@TiO2@C anode shows lithium and sodium storage performances superior to those of the pristine Sb2S3 and core–shell Sb2S3@TiO2 electrodes. For lithium-ion batteries, the Sb2S3/Sb@TiO2@C nanorod composite achieves an initial discharge/recharge capacity of 1244.9/1005.1 mAh g–1 with an initial Coulombic efficiency of about 80.7%, an enhanced rate capability with a capacity of 593.2 mA h g–1 at 5.0 A g–1, and prolonged cycling life for 500 cycles with a reversible capacity of 495.8 mAh g–1 at 0.5 A g–1. For sodium-ion batteries, the nanorodalso exhibits an improved performance with an initial discharge/recharge capacity of 781.4/574.0 mAh g–1 (initial Coulombic efficiency of about 73.46%) and cycling for 400 cycles with a reversible capacity of 422.6 mAh g–1 at 0.8 A g–1. This research sheds light upon double-shell structure designs with an effective middle shell to enhance the energy storage performance of electrode materials.

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Unravelling binder chemistry in sodium/potassium ion batteries for superior electrochemical performances

Abstract: The binder chemistry in Na/K ion batteries is important to advanced electrochemical performances. Here, commercial TiO2 nanoparticles are employed as a model to illustrate the binder chemistry in ethers, with...

Cited by 30 publications

References 44 publications

Significant Enhancement in the Electrochemical Performances of a Nanostructured Sodium Titanate Anode by Molybdenum Doping for Applications as Sodium-Ion Batteries

Significant Enhancement in the Electrochemical Performances of a Nanostructured Sodium Titanate Anode by Molybdenum Doping for Applications as Sodium-Ion Batteries

Integrated Design from Microstructural Engineering to Binder Optimization Enabling a Practical Carbon Anode with Ultrahigh ICE and Efficient Potassium Storage

Double-Enhanced Core–Shell–Shell Sb₂S₃/Sb@TiO₂@C Nanorod Composites for Lithium- and Sodium-Ion Batteries

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Unravelling binder chemistry in sodium/potassium ion batteries for superior electrochemical performances

Abstract: The binder chemistry in Na/K ion batteries is important to advanced electrochemical performances. Here, commercial TiO2 nanoparticles are employed as a model to illustrate the binder chemistry in ethers, with...

Cited by 30 publications

References 44 publications

Significant Enhancement in the Electrochemical Performances of a Nanostructured Sodium Titanate Anode by Molybdenum Doping for Applications as Sodium-Ion Batteries

Significant Enhancement in the Electrochemical Performances of a Nanostructured Sodium Titanate Anode by Molybdenum Doping for Applications as Sodium-Ion Batteries

Integrated Design from Microstructural Engineering to Binder Optimization Enabling a Practical Carbon Anode with Ultrahigh ICE and Efficient Potassium Storage

Double-Enhanced Core–Shell–Shell Sb2S3/Sb@TiO2@C Nanorod Composites for Lithium- and Sodium-Ion Batteries

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Product

Resources

About

Double-Enhanced Core–Shell–Shell Sb₂S₃/Sb@TiO₂@C Nanorod Composites for Lithium- and Sodium-Ion Batteries