German scientists: the use of reed lithium battery silicon anode material preparation

Recently, the Chinese Academy of Sciences Key Laboratory of Energy Conversion Materials, University of Science and Technology of China Department of Chemistry and Materials Yu Yan Professor Task Force and Max Planck Institute of Solid State Research cooperation team invented a reed lithium-ion battery made of three-dimensional silicon anode The material preparation method breaks the technical difficulties of synthesizing silicon with complicated chemical steps and provides more possibilities for developing a new generation of lithium-ion batteries in the future.

The current lithium-ion battery mainly graphite and modified graphite anode material, but its theoretical capacity of 372 mAh / g difficult to meet the long-range needs of electric vehicles. In contrast, silicon-based anode materials with higher theoretical capacity (4200 mAh / g) are the hot topics in the field of next-generation anode materials for lithium-ion batteries. The Yu Yan professor task force innovative use of reed as preparation of raw materials, not only simplifies the process, but also reduce costs.

This method is based on the reduction of dense three-dimensional porous silica (SiO2) from natural reed leaves based on magnesium reduction. Phragmites australis as a skeleton, on which magnesium oxide (MgO), a by-product produced, acts as a prototype of the pore.

According to the researchers, compared with the current methods for preparing nanostructured silicon-based negative electrodes, the reed-based method includes the following advantages:

1, reed leaves are renewable materials;

2, the reduction of silicon to maintain the three-dimensional nano-structure of crude oil reed leaves, this structure is very conducive to improving the performance of the negative (because it can slow the negative electrode was powdered);

3, the method is simple and easy;

4, without the use of expensive silicon starting materials or reagents

When this method was used to prepare the negative electrode, the original silicate topology in the reed leaves was magically preserved and was not completely disrupted in a series of physicochemical treatment protocols. In the process of purification of dried reed leaves, the internal three-dimensional structure will only shrink, mesoporous network can remain intact, even after the carbonization process will not change it.

According to Liu Jun (transliteration) introduced in the research team, magnesium heat reduction has two advantages. First, it maintains the original structure of silicon in reed leaves. Second, corrosion of magnesium oxide additives can further increase the density of the inner pores. These two points, supplemented by subsequent carbon coating on a silicon motor, can greatly improve the electrochemical performance of the negative electrode of the lithium-ion battery, such as large reversible capacity and excellent charge-discharge current density cycle capability. Finally, reed as a natural material, the high-performance lithium-ion battery for large-scale production possible.

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