以Si/SiO_(2)为前驱体的锂离子电池负极材料研究进展

Research progress of anode materials for lithium ion batteries with Si/SiO_(2) as precursor

硅基材料因具有高的比容量,被认为是最有前途的锂离子电池负极材料之一。然而,由于自身电导率低和循环时体积膨胀大,限制了其应用。以Si/SiO_(2)为前驱体形成多种复合结构,发挥各自固有的优点,可以有效减轻硅的体积效应和改善整体的循环稳定性。SiO_(2)作为基质不仅可以压缩晶格间距,抑制过度的相变和体积变化,还可以缓解锂化/脱锂过程中硅体积变化的负面影响,从而保证较长的循环寿命,同时保持硅能提供高的容量。为此我们考虑到如何有效制备Si/SiO_(2)复合材料变得很有研究意义,使它制备简单、成本低廉,在实际锂离子电池中具有良好的应用前景。

Silicon-based materials are considered to be one of the most promising anode materials for lithium ion batteries due to their high specific capacity.However,its low electrical conductivity and large volume expansion during cycling limit its application.Using Si/SiO_(2) as a precursor to form a variety of composite structures can effectively reduce the volume effect of silicon and improve the overall cycle stability by taking advantage of their inherent advantages.SiO_(2) as a matrix can not only compress the lattice spacing,suppress excessive phase changes and volume changes,but also alleviate the negative effects of silicon volume changes during lithium/delithiation,thereby ensuring a long cycle life,while maintain silicon to provide high capacity.For this reason,we have considered how to effectively prepare Si/SiO_(2) composite materials,which makes it easy to prepare,low cost,and has good application prospects in practical lithium ion batteries.