A porous lithium metal anode, its preparation and its application in lithium metal batteries
A lithium metal anode, porous metal technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of increasing the contact area between metal lithium and electrolyte, reducing electrode surface current density, interface side reactions, etc. The effect of reducing the apparent current density, suppressing the occurrence and continuous loss of metallic lithium, and stabilizing the cycle
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Embodiment 1
[0055] Commercialized copper foam current collector ( figure 1 ) with a thickness of 40 μm, a porosity of 60%, and a pore spacing of 80 μm. The copper foam was placed in an oxygen-containing nitrogen atmosphere (oxygen content 20%), and sintered at 500 ° C for 1 hour to obtain a copper oxide-modified copper foam ( figure 2 ). This electrode is used as the working electrode, and the metal lithium sheet is used as the counter electrode, and 1M LiTFSI / DOL: DME (volume ratio = 1: 1) contains 1wt.% LiNO 3 Assemble the button battery for the electrolyte, and conduct a charge-discharge cycle test. At the same time, the corresponding charge-discharge cycle test was carried out with pure copper foam as the comparison sample.
[0056] The test found that the surface of the foamed copper was uniformly covered with a layer of dense copper oxide ( image 3 ), achieving uniform dendrite-free lithium deposition, effectively avoiding the occurrence of lithium dendrites and interfacial rea...
Embodiment 2
[0058] The commercial porous nickel-iron current collector has a thickness of 70 μm, a porosity of 40%, and a pore spacing of 120 μm. The porous nickel-iron is placed in an oxygen-containing argon atmosphere (oxygen content 30%) and sintered at 700 ° C for 2 h Porous nickel iron modified by oxide layer was obtained. This electrode is used as the working electrode, and the metal lithium sheet is used as the counter electrode, and 1M LiTFSI / DOL: DME (volume ratio = 1: 1) contains 1wt.% LiNO 3 Assemble the button battery for the electrolyte, and conduct a charge-discharge cycle test. At the same time, the corresponding charge-discharge cycle test was carried out with pure porous nickel-iron as the comparison sample.
[0059] The test found that the surface of porous nickel-iron is uniformly covered with a dense oxide layer. Especially at 5mA / cm 2 Under a certain current density, the cycle life of the oxidized porous nickel-iron electrode is more than 5 times that of the pure p...
Embodiment 3
[0061] Full battery case:
[0062] The copper oxide-modified foamed copper prepared in Example 1 was used as a working electrode, and then at 0.5mA / cm 2 At a current density of 5mAh / cm 2 Lithium metal is prepared into a composite anode material on the electrode, and then a lithium-sulfur battery is formed with a carbon nanotube positive electrode rich in S, containing 1wt.% LiNO in 1M LiTFSI / DOL:DME (volume ratio=1: 1) 3 In the electrolyte solution, the charge-discharge cycle test was carried out at 1C.
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