Preparation method of binder-free lithium ion battery negative electrode material

Abstract

The invention belongs to the field of battery energy, and particularly relates to a preparation method of a binder-free lithium ion battery negative electrode material. The method comprises the following steps that: step 1, under the protection of argon, direct sintering and ball-milling are performed waste silicon powder generated by single crystal cutting; step 2, sodium silicate is added into an obtained product so as to be mixed with the product, ammonium chloride is added, and ball milling and drying are performed; 3, asphalt is added, and sintering is performed; 4, hydrofluoric acid soaking treatment is conducted, and washing is conducted until a product is neutral; 5, nano titanium dioxide particles are added, and carbon nanotubes are added, and ball milling is performed; and 6, tabletting is performed through a tabletting machine, so that the flaky silicon-based lithium ion battery negative electrode material can be obtained.

Description

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

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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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