Preparation method of lithium titanate negative electrode material and lithium titanate negative electrode material prepared by employing method

Abstract

The invention belongs to the field of energy storage research, and particularly relates to a preparation method of a lithium titanate negative electrode material. The method mainly comprises the steps of 1, mixing a power source substance 1, nanometer lithium titanate particles and graphite particles until uniform mixing is achieved; 2, adding an electrolyte 1 and then continuing to mix to form ion passages, stripping the graphite particles under the effect of the power source substance at the moment to form an opening structure of a graphite sheet layer, and continuously filling the opening structure of the graphite sheet layer with the nanometer lithium titanate particles under a hybrid acting force; and 3, removing an electrolyte constituent after filling is completed, and performing coating and carbonization to obtain the lithium titanate negative electrode material. When the method is used for preparing a lithium titanate negative electrode, the opening of the graphite particle sheet layer and the filling of the lithium titanate particles can be simultaneously performed, so that the filling is smoother, and the lithium titanate negative electrode material is enabled to have favorable electrochemical performance.

Description

technical field

[0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a preparation method of a lithium titanate negative electrode material and a lithium titanate negative electrode material prepared by the method. Background technique

[0002] Lithium-ion batteries have brought revolutionary changes to the field of energy storage since their birth due to their advantages such as fast charging and discharging, good low-temperature performance, large specific energy, small self-discharge rate, small size, and light weight. Used in various portable electronic devices and electric vehicles. However, with the improvement of people's living standards, higher user experience puts forward higher requirements for lithium-ion batteries: faster charging and discharging (such as 5C or even 10C), wider temperature range (such as minus 30 degrees Celsius) Use, etc.; In order to solve the above problems, it is necessary to find new...

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