A kind of preparation method of binderless lithium ion battery negative electrode material

Abstract

The invention belongs to the field of battery energy, in particular to a method for preparing a binder-free lithium-ion battery negative electrode material. Step 1, under the protection of argon, take the waste silicon powder produced by single crystal truncation and directly sinter and ball mill; Step 2, add sodium silicate to mix, add ammonium chloride, ball mill, and dry. Step 3, adding pitch and sintering; Step 4, soaking in hydrofluoric acid, washing until neutral; Step 5, adding nano-titanium dioxide particles, adding carbon nanotube ball milling; Lithium-ion battery anode material.

Description

technical field [0001] The invention belongs to the field of battery energy, and in particular relates to a preparation method of a binder-free lithium-ion battery negative electrode material. Background technique [0002] At present, in the field of energy storage, lithium-ion batteries have been widely concerned and researched due to their advantages such as high specific energy, long cycle life, and moderate price. As one of its core components, the battery negative electrode plays a vital role in battery performance. Silicon-based anode materials have become the first choice for a new generation of lithium-ion battery anodes due to their advantages such as high specific capacity. However, since the silicon material is a semiconductor material, its electrical conductivity is not good. At the same time, there are problems such as the volume expansion effect during the material cycle, which makes the cost of the nano-preparation process relatively high, which affects the p...

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Problems solved by technology

However, since the silicon material is a semiconductor material, its electrical conductivity is not good, and at the same time, there are problems such as the volume expansion effect in the material circulation process, which makes the cost of the nanometer preparation process relatively high, which affects the popularization and application of the material.

The nanotubes and nanoparticles in carbon nanomaterials are nanometer-sized, and their interstitial space is also nanoscale, which can provide a large amount of intercalation space for lithium ions, making it have excellent lithium intercalation characteristics, which is conducive to the charging and discharging of lithium-ion batteries Capacity and cycle life, but there are disadvantages such as voltage hysteresis and the charge-discharge potential platform is not obvious

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