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以二氧化锗和二水合醋酸锌为原料,采用水热法制备了锗酸锌纳米棒,并将其与氧化石墨烯复合,制备了石墨烯包覆的锗酸锌纳米棒三维复合材料.SEM等测试表明,锗酸锌纳米棒均匀地穿插在石墨烯片中,阻止了石墨烯片之间相互堆垛,而石墨烯片层之间相互连接,形成三维的空间导电网络,提高了材料的电子导电性.电化学测试表明,石墨烯片作为稳定的框架,能够有效缓冲活性物质在脱嵌锂过程中产生的体积变化,在500 m A·g~(-1)电流密度下循环190次后,Zn_2GeO_4@RGO复合材料的嵌锂容量仍有1189.5 m Ah·g~(-1);在3.2 A·g~(-1)的大电流密度下,嵌锂容量达到449.5m Ah·g~(-1),表明该复合材料具有优异的长循环稳定性和良好的倍率性能.
Germanium germanate and dihydrate zinc acetate as raw materials, the hydrothermal method prepared germanate germanium oxide nanorods, and graphene oxide and composite prepared graphene coated zinc germanate nanorods three-dimensional composite material.SEM The tests show that the zinc germanate nanorods are uniformly interspersed in the graphene sheets, preventing the graphene sheets from stacking with each other, and the graphene sheets are connected to each other to form a three-dimensional space conductive network, thereby improving the material’s The results of electrochemical tests showed that the graphene sheet as a stable framework can effectively buffer the volume change of the active material during deintercalation of lithium and cycled 190 times at a current density of 500 m A · g -1 , The lithium insertion capacity of Zn 2 GeO 4 @ RGO composites is still 1189.5 m Ah · g -1. With the high current density of 3.2 A · g -1, the lithium insertion capacity reaches 449.5 m Ah · g ~ (-1), indicating that the composite material has excellent long cycle stability and good rate performance.