Folding insensitive, high energy density lithium-ion battery featuring carbon nanotube current collectors

Recent Advances in Nanowire‐Based, Flexible, Freestanding Electrodes for Energy Storage

“…Moreover,ahighm ass loading ( % 5mgcm À2 ) LiCoO 2 and Li 4 Ti 5 O 12 electrodes was obtained by filtration within pores of the CNT network, formingastrong interface, and hence, improvingt he mechanical stability. [40] The scalable fabrication of freestanding hierarchical P/CNTs@rGO composites with both ultrahigh capacity and outstanding stability for LIBs and SIBs was achieved by the group of Qian ( Figure 5). [25] The P/CNTs@rGO composite with the 3D interconnected CNT@rGO network closely incorporating red Pe ffectively, which alleviated the severe volumev ariation of red P, and thus, an unprecedented gravimetric capacity of 2189.1 mAh g À1 for LIBs and 2112 mAh g À1 for SIBs was obtained, even at a high Pc ontent of 70 wt %.…”

Advanced 3D Current Collectors for Lithium‐Based Batteries

“…The CNTs are made of sp 2 ‐hybridized carbon and can be obtained by CVD with Fe nanoparticles as the catalysts. CNT films can be drawn from CNT forests by an end‐to‐end joining mechanism (Figure e) or can be obtained by randomly stacking of CNT or CNT bundles, which is an ideal scaffold for loading active materials . There are several advantages of using CNT films as current collectors for LIBs: i) the CNT films can be extremely lightweight (≈0.04 mg cm −2 ) and thin (<1 µm); ii) the sheet resistance of a multilayer CNT film can be down to 66 Ω sq −1 ; iii) the porous structure of CNT films enables easy slurry infiltration, large contact area, good wetting, strong adhesion, and low contact resistance between the active material and CNT interface; iv) CNT films are much more chemically stable than metal current collectors; vi) fabrication of CNT films has been scaled up to meet the industrial requirements.…”

Potassium‐Based α‐Manganese Dioxide Nanofiber Binder‐Free Self‐Supporting Electrodes: A Design Strategy for High Energy Density Batteries

“…[5,6] One strategy to eliminatet he binder and current collector is to anchor or grow the redox-activem aterial on ac onductive fibrousn etwork or support,f or which the redox-active materials are either synthesized in situ, directly deposited by electrodeposition, or attached ontot he conductive supports. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Ty pical conductive supports include nanofibers (i.e., carbon nanotubes),n anosheets (i.e., reduced graphene oxide),a nd fibrous carbon sources with network-like structures.D ifferentf rom previous binder-free and free-standing electrodes tudies,o ur approach uses redox-activeh igh aspect ratio potassium-containing a-MnO 2 -typem anganese dioxide nanofibers (K-OMS-2)a st he structural element, and this results in binder-free self-supporting( BFSS) cathodes.T he electrochemical behavior was tested by galvanostatic dis-charge/charge testing, electrochemical impedance spectroscopy (EIS),and galvanostatic intermittenttitration-type testing. By eliminatingt he binders and current collector, cells with K-OMS-2 BFFS cathodes displayed enhanced specifice nergies (3-folda tl ower rates,1 0-fold at higher rates) relative to cells with conventionally constructed cathodes (Figure 1, inset).…”