Wearable electronics have received considerable attention in recent years. These devices have penetrated every aspect of our daily lives and stimulated interest in futuristic electronics. Thus, flexible batteries that can be bent or folded are desperately needed, and their electrochemical functions should be maintained stably under the deformation states, given the increasing demands for wearable electronics. Carbon nanomaterials, such as carbon nanotubes, graphene, and/or their composites, as flexible materials exhibit excellent properties that make them suitable for use in flexible batteries. Herein, the most recent progress on flexible batteries using carbon nanomaterials is discussed from the viewpoint of materials fabrication, structure design, and property optimization. Based on the current progress, the existing advantages, challenges, and prospects are outlined and highlighted.

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Iodine-active graphene composites as cathode materials for rechargeable Li–I2 batteries are fabricated. Soluble iodine redox species can be confined in the porous active graphene substrate, making the composites promising materials for high-rate energy storage devices.

5Li-rich layered oxides have been intensively investigated as cathode for high energy lithium-ion batteries. However, oxygen loss from the lattice in the initial charge and the gradual structural transformation during cycling can lead to a capacity degradation and potential decay for the cathode materials. In this work, Sn 4+ is used to partially substitute Mn 4+ to prepare a series of Li(Li 0.17 Ni 0.25 Mn 0.58-x Sn x )O 2 (x = 0, 0.01, 0.03, and 0.05) samples through a spray-drying method. Structure characterization reveals that the 10 Sn 4+ substituted samples with a suitable amount show a low cation mixing, indicating an enhanced ordered layer structure. Moreover, the metal-oxygen (M-O) covalency is gradually decreased with increasing Sn 4+ amount. It is shown from the initial charge-discharge curves that Sn 4+ substituted samples present a shorter charging potential plateau at 4.5 V (vs Li/Li + ), implying that oxidation of the O 2ion to O 2 is suppressed by Sn 4+ substitution and lead to the minor structural change. Among the Sn 4+ substituted 15 samples, the Li(Li 0.17 Ni 0.25 Mn 0.55 Sn 0.03 )O 2 sample exhibits a higher capacity retation of 86% after 400 cycles at 0.1 C rate and 92 % after 200 cycles at 1 C rate, showing an excellent cycle stability and highrate capability as compared with the as-prepared sample. The electrochemical performance improvement can be attributed to the influence of Sn such as enlarging Li ion diffusion channel due to large ionic radius of Sn 4+ substitution with respect to Mn 4+ , higher bonding energy of Sn-O than Mn-O, and weakening M-20 O covalency. All the influence is favorable for stabilization of the host lattice in Li-rich layered oxides. 65 the lithium ion diffusion channel and decrease the M-O covalency in Li-rich layered oxides. Correspondingly, the oxygen

The effect of chiral imbalance on the QCD phase structure is studied in a framework of Dyson-Schwinger equations. It is found that the chiral phase transition is always a crossover in the T -p5 plane when p is 0 MeV or small values. The trail of the critical endpoints (CEPs) along with the variation of the chiral chemical potential is given. We find that the effect of p5 is somewhat different from the existing chiral model calculations; namely, the CEP first moves roughly along the phase boundary of T -p plane in a smaller/i direction, as in the chiral model calculations, but turns in the opposite direction to move away from the small chemical potential region, which has never been observed before. In addition, we also discuss the possibility of whether the study at finite temperature and chiral chemical potential can provide some useful information for the detection of the CEP at finite temperature and baryon chemical potential, since the former can be calculated in lattice QCD without the sign problem.