Negative electrode material applied to lithium ion battery and preparation method of negative electrode material

Abstract

The invention discloses a negative electrode material applied to a lithium ion battery and a preparation method of the negative electrode material. The negative electrode material applied to the lithium ion battery is composed of a spinel lithium titanate nanotube and an activated carbon material. The method comprises the following steps: uniformly mixing tetrabutyl titanate and Li2CO3 (or lithium sources such as LiOH), regulating the mixture to be alkaline by using ammonia water and hydroxylamine hydrochloride, and then transferring into a high-pressure kettle and performing hydrothermal reaction at 100-200 DEG C for 24 hours above; cleanly washing the reacted product by respectively using deionized water and absolute ethyl alcohol, and roasting in vacuum at a certain temperature to obtain the spinel lithium titanate nanotube; and heating the activated carbon material at high temperature, and uniformly mixing the activated carbon material with the spinel lithium titanate nanotube to prepare the negative electrode material for the lithium ion battery. Spinel lithium titanate can guarantee the excellent circulating stability of the lithium ion battery, also has the advantages of over-charge resistance, heat stability, high security and large specific capacity, and has wide application prospect when serving as the material for the negative electrode of the lithium ion battery.

Description

technical field [0001] The invention relates to a negative electrode material applied to a lithium ion battery, in particular to a lithium ion electrode material composed of a spinel lithium titanate nanotube and a carbon material and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries have unique advantages such as high working voltage, high energy density, long cycle life, low self-discharge, no memory effect, no pollution and good safety performance. After more than ten years of rapid development, small rechargeable batteries It has replaced traditional lead-acid batteries, nickel-cadmium batteries and nickel-metal hydride batteries in the market, making it one of the high-profile power sources. However, the safety of large-capacity lithium-ion batteries has always been one of the main issues restricting its development. Under conditions such as high temperature, internal short circuit, extrusion, vibration, etc., the battery will...

AI Technical Summary

Problems solved by technology

[0004]1. Lithium dendrites are easily precipitated during overcharging, causing a short circuit of the battery and affecting the safety performance of the lithium battery;

[0005] 2. It is easy to form SEI film, resulting in low initial charge and discharge efficiency and large loss of irreversible capacity;

[0006] 3. The platform voltage of carbon materials is low (close to metal lithium), and it is easy to cause the decomposition of electrolyte, which brings safety hazards;

[0007] 4. The volume changes greatly during the process of lithium ion intercalation and extraction, and the cycle stability is poor;

[0013] Spinel lithium titanate Li 4 Ti 5 0 12 Usually made of TiO 2 with Li 2 CO 3 Or lithium salts such as LiOH are prepared by high-temperature solid-phase method, the reaction temperature is 800~1000°C, and the reaction time is long