Anode material for lithium ion battery and preparation method thereof

Abstract

The invention discloses a preparation method of an anode material for a lithium ion battery, which comprises the following steps of: mixing titanium dioxide with lithium carbonate to be ball-milled evenly, carrying out heat preservation for 10-180 minutes at the temperature of 750-850 DEG C and cooling to obtain lithium titanate; and mixing the lithium titanate with a solid-state nitrogen source compound to be calcined with the protection of protective gas, and obtaining the anode material for the lithium ion battery after reaction. In the step of preparing the lithium titanate, the time for heat preservation of raw materials at high temperature is greatly shortened, the aggregation of material particles caused by long-time ignition is avoided, the particle size of the lithium titanate is greatly reduced, and the modification area of TiN after the lithium titanate is nitrided is increased, so that the conductivity performance of the prepared anode material for the lithium ion battery is improved. In addition, due to the reduction of the particle size of the lithium titanate, the migration distance of lithium ions in a charge-discharge process of the lithium ion battery is reduced, and thus the large current charge-discharge performance of the anode material for the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and more specifically, relates to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] In recent years, with the increasing depletion of resources and the emergence of issues such as global warming, green and low-carbon lifestyles have been advocated. Among them, the development of electric vehicles and hybrid electric vehicles to partially replace internal combustion engine vehicles that consume fossil fuels is one of the main methods to solve the energy crisis and environmental degradation. Driving power is a key component that affects the popularization and use of electric vehicles. Today, widely used driving power includes lead-acid batteries, nickel metal hydride / nickel cadmium, lithium ion batteries, etc. Among various driving power sources, lithium-ion batteries have been extensively studied due to their advantages...

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Problems solved by technology

Specifically, Snyder M Q (see: Journal of Power Sources, 2007, 165 (1): 379-385) reported that Li 4 Ti 5 o 12 Deposit a layer of TiN on the surface, so that Li 4 Ti 5 o 12 The conductive performance of the method is improved, but the method is complicated to operate, the cost is high, and the conditions are difficult to control

Kyu-Sung Park (see: J.Am.Chem.Soc., 2008, 130 (45): 14930-14931) reported the use of ammonia decomposition method in Li 4 Ti 5 o 12 Preparation of TiN film on the surface, the ammonia gas used in this method is corrosive and dangerous, and it is difficult to control the uniformity of material coating in large-scale production

[0006] The lithium-ion battery anode materials reported above are all prepared by roasting at high temperature for more than 10 hours. 4 Ti 5 o 12 The material is the raw material, since Li 4 Ti 5 o 12 Particles are easy to agglomerate, and long-term roasting will cause Li 4 Ti 5 o 12 The particles are too large, so that the prepared surface-modified Li with TiN 4 Ti 5 o 12 Poor conductivity and high current charge and discharge performance of negative electrode materials

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