A method for preparing germanium negative electrode material on nickel nano needle cone array
A negative electrode material and nano-needle technology is applied in the field of preparing germanium negative electrode material on nickel nano-needle cone array, and achieves the effects of good binding force, uniform germanium film, and simple and convenient method.
Active Publication Date: 2016-11-30
HARBIN INST OF TECH
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On the contrary, there is less research on preventing the pulverization and falling off of anode materials by changing the structure of current collectors.
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Embodiment 1
[0030] (1) Treatment of negative electrode substrate
[0031] Before using the directional electrocrystallization method to electroplate a layer of nickel nano needle cone array on the surface of the nickel foil, the nickel foil is firstly subjected to texturing treatment. Immerse for 5 minutes, wash with deionized water, and dry;
[0032] (2) Preparation of nickel nano needle cone arrays by directional electrocrystallization method
[0033] Nickel nano-needle cone arrays were prepared by directional electrocrystallization without a template; the raw materials used were all analytically pure chemical reagents, and pure deionized water was used to prepare the solution, and the composition of the control solution was: nickel chloride 1.0mol / L , boric acid 0.5mol / L, ammonium chloride 4.0mol / L, and use 10% ammonia water and 10% hydrochloric acid to adjust the pH of the solution to 4.0, the electrodeposition temperature is 50~60℃, and the time is 4min; after completion Rinse with...
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The invention discloses a method for preparing a germanium negative electrode material on a nickel nano needle cone array. The preparation method of the present invention is as follows: first, a nickel nano needle cone array of a certain height is prepared on a nickel substrate by means of aqueous solution electrodeposition, and then in an anaerobic and anaerobic environment, a germanium negative electrode material is prepared by means of ionic liquid electrodeposition, After carbon spraying, the battery was assembled and its electrochemical performance was tested. The invention utilizes the method of ionic liquid electrodeposition on the nickel nano needle cone array to prepare a germanium negative electrode material with high specific capacity, long cycle life and high coulombic efficiency. During the ionic liquid electrodeposition process, the current density is small, and the prepared germanium film Uniform; and the prepared material is nano-scale particles, which reduces the pulverization in the material circulation process. The prepared negative electrode material and the substrate (nickel nano-needle cone array) have a large base area and good bonding force. The preparation method is simple and easy to operate. .
Description
technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a method for preparing a germanium negative electrode material on a nickel nano needle cone array. Background technique [0002] Since Sony introduced carbon materials into the market as negative electrodes of lithium-ion batteries in the 1990s, carbon and carbon-based materials have always dominated the negative electrodes of lithium-ion batteries. However, due to the limitation of theoretical capacity (LiC6, 372 mAh / g), carbon materials can no longer meet the requirements of users. [0003] At present, C, Si, Ge and Sn, which are the fourth main group, are all excellent materials for lithium-ion battery cathodes, especially thin-film or nanostructured lithium batteries due to their high specific energy, good cycle charge and discharge performance, The stable discharge platform and other advantages have received more attention. However, the germanium th...
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IPC IPC(8): H01M4/04H01M4/1395C30B7/12C30B29/02C30B29/62C25C3/34B82Y30/00
Inventor 赵九蓬安小坤李垚郝健
Owner HARBIN INST OF TECH