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FE-SEM images of (a,b) NCM powder and (c,d) graphite powder. XRD patterns of NCM and graphite powders are shown in Figure 2a,b. As shown in Figure 2a,b, XRD patterns of NCM and graphite powders and their joint committee on
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This study reports an integrated device of a lithium-ion battery (LIB) connected with Si solar cells. A Li(Ni0.65Co0.15Mn0.20)O2 (NCM) cathode and a graphite (G) anode were used to fabricate the lithium-ion battery (LIB). The surface and shape morphologies of NCM and graphite powder were characterized by field emission scanning electron microscopy...
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... was then performed with a battery cycler. Figure 1 shows FE-SEM images of NCM and graphite powder. The particle size and the shape of NCM powder are shown in Figure 1a,b. ...
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... 1 shows FE-SEM images of NCM and graphite powder. The particle size and the shape of NCM powder are shown in Figure 1a,b. The NCM powder consisted of large and small particles with diameters of about 10 μm and 3 μm, respectively. ...
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... bimodal structure could also improve electrochemical performance due to a large contact area between large particles and small particles [19]. The particle size and the shape of the graphite powder are shown in Figure 1c,d. FE-SEM magnitudes of Figure 1c,d were 1000 and 3000, respectively. ...
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... particle size and the shape of the graphite powder are shown in Figure 1c,d. FE-SEM magnitudes of Figure 1c,d were 1000 and 3000, respectively. The average size of the graphite powder was about 20 μm. ...
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... For these reasons, numerous scholars have improved the electrochemical properties of NCM by adjusting the elemental ratios of Ni-Co-Mn in order to obtain ternary materials with better performance in all aspects. The relevant NCM materials that have been studied include LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM111) [30][31][32][33][34][35], LiNi 0.4 Co 0.2 Mn 0.4 O 2 (NCM424) [30][31][32][33][34], LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) [36][37][38][39][40][41] and other NCM materials with non-stoichiometry ratios of Ni-Co-Mn elements [42][43][44][45][46][47][48][49][50][51][52], etc. In particular, the nickel-rich NCM materials LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622) [52][53][54][55][56][57][58][59][60][61], LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) [7,[62][63][64][65][66][67][68][69][70][71] and other NCM with more than 90% nickel content [69,[72][73][74][75][76][77][78], even the cobalt-free ternary materials [79][80][81][82][83][84][85][86][87][88][89][90][91], have become increasingly popular active cathode materials because of the higher potential vs. Li, higher energy densities, less toxicity, and lower priced raw materials, which can better meet the needs of electric vehicles. ...
The booming electric vehicle industry continues to place higher requirements on power batteries related to economic-cost, power density and safety. The positive electrode materials play an important role in the energy storage performance of the battery. The nickel-rich NCM (LiNixCoyMnzO2 with x + y + z = 1) materials have received increasing attention due to their high energy density, which can satisfy the demand of commercial-grade power batteries. Prominently, single-crystal nickel-rich electrodes with s unique micron-scale single-crystal structure possess excellent electrochemical and mechanical performance, even when tested at high rates, high cut-off voltages and high temperatures. In this review, we outline in brief the characteristics, problems faced and countermeasures of nickel-rich NCM materials. Then the distinguishing features and main synthesis methods of single-crystal nickel-rich NCM materials are summarized. Some existing issues and modification methods are also discussed in detail, especially the optimization strategies under harsh conditions. Finally, an outlook on the future development of single-crystal nickel-rich materials is provided. This work is expected to provide some reference for research on single-crystal nickel-rich ternary materials with high energy density, high safety levels, long-life, and their contribution to sustainable development.
We synthesize a phosphor by combining trimethylammonium tetraphenyl porphyrin with palladium (II), obtaining Pd–TTAP, and investigate its interaction with graphene oxide (GO). Pd–TTAP and GO are found to be noncovalently bonded, according to high-resolution transmission electron microscopy (HR-TEM), ultraviolet-visible spectroscopy (UV-Vis), room temperature phosphorescence spectroscopy (RTP), Raman spectroscopy, and infrared spectroscopy (IR). The binding constant is 2.32 × 104 M−1, calculated using the Benesi–Hildebrand method, and a photoelectric response test finds that photo-induced electrons are transferred from the triplet excited state of Pd–TTAP to GO under visible light excitation. Our results demonstrate that Pd–TTAP can serve as an eff ective energy donor, with GO as an electron acceptor, in photoelectric conversion systems.
