Li-rich layered oxides have been in focus because of their high specific capacity. However, they usually suffer from poor kinetics, severe voltage decay, and capacity fading. Herein, a long-neglected Li-deficient method is demonstrated to address these problems by simply reducing the lithium content. Appropriate lithium vacancies can improve dynamics features and induce in situ surface spinel coating and nickel doping in the bulk. Therefore, the elaborately designed Li1.098Mn0.533Ni0.113Co0.138O2 cathode possesses improved initial Coulombic efficiency, excellent rate capability, largely suppressed voltage decay, and outstanding long-term cycling stability. Specifically, it shows a superior capacity retention of 93.1% after 500 cycles at 1 C (250 mA g–1) with respect to the initial discharge capacity (193.9 mA h g–1), and the average voltage still exceeds 3.1 V. In addition, the discharge capacity at 10 C can be as high as 132.9 mA h g–1. More importantly, a Li-deficient cathode can also serve as a prototype for further performance enhancement, as there are plenty of vacancies.
The Update data (August 4, 2023) of the SinoLC-1 land-cover product. The SinoLC-1 was created by the Low-to-High Network (L2HNet), which can be found at: https://doi.org/10.1016/j.isprsjprs.2022.08.008. NOTE: If you have any data needs, questions, or technical issues, please get in touch with us at ashelee@whu.edu.cn (Zhuohong Li), and we will reply carefully and provide assistance.The latest update is on August 4, 2023. The tiff file of image capture time and original tiles with the size of 6000 × 6000 pixels ( including 1-m Google imagery and 1-m SinoLC-1 results) of Nanchang City, Jiangxi Province, Shanghai City, Hefei City, Anhui Province, Chengdu City, Sichuan Province have been updated.We will keep collecting users' feedback and updating the data, stay tuned! Currently, the preprint of this product is under review in Earth System Science Data Discussion: https://essd.copernicus.org/preprints/essd-2023-87/ Citation format of preprint: Li, Z., He, W., Cheng, M., Hu, J., Yang, G., and Zhang, H.: SinoLC-1: the first 1-meter resolution national-scale land-cover map of China created with the deep learning framework and open-access data, Earth Syst. Sci. Data Discuss. [preprint], https://doi.org/10.5194/essd-2023-87, in review, 2023.
The intelligent recognition of rock sample lithology plays an important role in mineral resources exploration. According to the rock sample image, a depth learning model is established. In order to solve the problem of gradient disappearance caused by the excessive depth of neural network, residual structure is introduced, the ResNet structure model is built, and a comparison based self-supervised learning classification algorithm is established, which does not depend on any label value. Using the encoder network to extract features and calculate the reconstruction error in pixel space, we can obtain the ability to identify new samples. The self-supervised lithology recognition algorithm takes resnet18 as the encoder network and the public ImageNet data set as the pre-training data. The parameters are optimized by using the comparative learning gradient descent of positive and negative samples, it adopts a linear classifier, The classification accuracy of rock samples is 85%, which is higher than the classification algorithm based on resnet18 and migration learning, and provides a scientific basis for lithology identification.
The corrosion of Li- and Mn-rich (LMR) electrode materials occurring at the solid-liquid interface will lead to extra electrolyte consumption and transition metal ions dissolution, causing rapid voltage decay, capacity fading, and detrimental structure transformation. Herein, a novel strategy is introduced to suppress this corrosion by designing an Na
As a new generation of electrode material, flexible electrode material can effectively broaden the application area and scope of energy storage devices. In this paper, a new vanadium pentoxide carbon fiber cloth (V 2 O 5 -CFC) is successful synthesized by means of electrospinning and high-temperature calcination. As a cathode material for aqueous zinc-ion batteries, V 2 O 5 -CFC possesses significantly increased specific capacity (132 mA h g −1 at 1 A g −1 ) and good cycling ability (154 mA h g −1 at 0.5 A g −1 after 1000 cycles). The volume effect in the charge/discharge process can be alleviated by using a composite fiber structure to avoid agglomeration of V 2 O 5 nanosheets. Most important, V 2 O 5 -CFC displays the flexible property and demonstrates its potential applications as a high-energy density and flexible energy storage device with good reversibility. Therefore, the design and synthesis strategy of flexible nanofiber film is prospective for applications in next-generation flexible aqueous zinc-ion batteries.
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