Method for manufacturing tin-stibium-nickel alloy cathode material of lithium ion battery

Abstract

The invention discloses a method for manufacturing a tin-stibium-nickel alloy cathode material of a lithium ion battery, comprising the following steps of: taking a carbon fiber cloth as a substrate; and adopting an electrodeposition process to plate tin-stibium-nickel alloys on the substrate, wherein a tin-stibium-nickel electrodeposition solution comprises 0.1-0.5 mol / L of soluble tin salt, 0.1-0.5 mol / L of soluble stibium salt, 0.1-0.5 mol / L of soluble nickel salt, 0.08-0.12 mol / L of ammonium salt, 0.08-0.12 mol / L of surface active agent. The electrodeposition process is utilized to manufacture the tin-stibium-nickel alloys, and a ternary alloy structure buffers volume change of the cathode material in the process of lithium insertion / extraction. Double-active components can insert / extract lithium at different levels, thus improving the insertion / extraction efficiency; and non-active components are introduced to reduce the volume expansibility in the process of lithium insertion / extraction. In addition, the carbon fiber cloth has a lithium storage function, so that the flexibility of the carbon fiber cloth also buffers the volume change of the alloys on the substrate effectively. Therefore, the manufactured tin-stibium-nickel alloys can improve the capacity and cyclical stability of the lithium ion battery. The method is simple in operation, can be carried out in water, is environmentally-friendly, and is in no need of high temperature and high pressure as well as inert gas protection. Performances can be controlled, and the thickness of an alloy layer can be changed by changing electrodeposition current density and time, thus regulating and controlling the weight or capacity of the material.

Description

technical field [0001] The invention relates to a preparation method of a tin-antimony-nickel alloy negative electrode material for a lithium ion battery. Background technique [0002] With the increasing consumption of fossil energy and the increasing demand for energy, the research and development of new energy materials is imminent. Electric energy has been popularized and used as early as the last century, and batteries are one of the common tools for using electric energy. Lithium-ion batteries are widely studied now. Due to the advantages of high energy density, long service life, low self-discharge rate and no memory effect of lithium-ion batteries, lithium-ion batteries have attracted more and more attention from scientists around the world. At present, the commonly used anode materials for lithium-ion batteries are mainly carbon materials. Although carbon anode materials are relatively stable, their specific capacity is low, which is close to the theoretical capaci...

AI Technical Summary

Problems solved by technology

Due to the high resistance of the nickel-plated steel strip, the output voltage of the battery is low, and the number of battery packs has to be increased, resulting in high cost and low safety

Due to the low porosity and small battery capacity of copper, it cannot meet the long-term development needs of high-capacity batteries

Zhang Dawei’s electrochemical deposition preparation method of tin-cobalt alloy thin-film electrode for lithium ion battery (CN 200810244780.9) and Huang Ling’s lithium ion battery tin-cobalt-phosphorus alloy negative electrode material and its preparation method (CN 101399338 A) respectively propose to use foam nickel or foam Electrodeposition of tin-based alloys on copper, but nickel foam and copper foam have low strength, cannot be continuously produced, high cost, uneven quality, easy to break, and poor confluence of high current, not suitable for high current discharge

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