电力系统储能中的多孔碳电池材料及应用实验研究

Experimental study on porous carbon battery materials and their applications in power system energy storage

针对电化学储能中的高能二次电池的经济效益、容量和稳定性等问题,提出一种制备Si/C@GR/G复合材料的方法和电池电极片工艺优化,并对其性能进行研究。实验结果表明,制备的包覆型碳硅复合材料能够减少电解液消耗,提高材料活性和电池容量;石墨烯的最佳掺量为5%,石墨烯二次包裹覆盖Si/C复合材料,此时,电池充放电过程中每次循环的电流及其增幅较强,材料表现出较好的活化反应和导电性,电池活性最佳;复合材料中纳米硅含量为10%时,电池表现出高容量、较好的充放电循环稳定性、安全性等优点。综上,制备的Si/C@GR/G多孔碳电池复合材料,不仅成本低,安全环保,还可以有效提高锂离子电池的容量、循环稳定性,表现出良好的电化学综合性能。

Aiming at the economic benefits,capacity and stability of high-energy secondary batteries in electrochemical energy storage,a new method for preparing Si/C@GR/G composite material was proposed and the process of battery electrode was optimized,and its performance was studied.The experimental results show that the coated carbon silicon composite can reduce the electrolyte consumption and improve the battery capacity and material activity;The secondary coating of graphene covers the Si/C composite material,and the optimum content of graphene is 5%,at which time,the current and its increase in each cycle during the battery charging and discharging process are strong,and the material shows good activation reaction and conductivity,and the battery activity is the best;When the content of nano-silicon in the composite material is 10%,the battery has the advantages of high capacity,good charge-discharge cycle stability and safety.To sum up,prepared Si/C@GR/G porous carbon battery composite material are not only low cost,safety and environmental friendly,but also can effectively improve the capacity and cycle stability of lithium-ion battery,showing good electrochemical comprehensive performance.