摘要
硅因具有最高的理论储锂容量而成为高能量密度锂离子电池的首选负极,然而其低的循环寿命严重阻碍了其商业化应用。硅负极低的循环寿命源于其在充放电过程中存在巨大体积膨胀。硅负极的体积膨胀使得硅颗粒和电极的机械稳定性、活性颗粒之间的电接触以及SEI膜的稳定性变差。为了提高其循环稳定性改变这种不利因素,研究者们在极片的制备工艺、电解液的选择以及电池的设计方面做了许多努力,并取得了一定的成效。对上述研究工作进行了综述,以期为硅负极的实用化进程提供可行的技术思路。
Silicon was considered as an important candidate anode for high energy density Li-ion batteries. However,its practical application was hindered by the poor cyclability, which was resulted from the huge volumetric changes during cycles. Such an enormous volume change brings about three severe problems for battery applications. One was the degradation of mechanical integrity of active silicon particles and electrodes. Another one was poor electrical contact between active particles. And the last one was the repeated construction and destruction of the SEI film. The mechanical integrity of active Silicon particles could be effectively depressed by well-designed Si materials. While the mechanical integrity of the electrodes, the electrical contact of the particles and instability of the SEI films only could be improved through preparing process of the electrodes, proper binder and electrolyte. The revolution of silicon anode was reviewed in the aspects of silicon particle preparation, binder selection and electrolyte development. We hope that the review can provide some clue and initiate some new ideas for promoting the commercial application of silicon anodes.
出处
《电源技术》
CAS
CSCD
北大核心
2016年第3期736-739,共4页
Chinese Journal of Power Sources
关键词
锂离子电池
硅负极
应用技术
lithium ion batteries
silicon
application
