上海超威纳米科技有限公司 已通过实名认证

<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由于纳米硅对与锂电池的高吸收率，将纳米硅（上海超威纳米<***N lang=EN-US>www.cwnano.com<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">提供纳米硅）用于锂电池可以大幅度提高锂电池的容量（理论可以达到<***N lang=EN-US>4000mA/h)<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。以纳米**和石墨为原料<***N lang=EN-US>,<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">替代纳米碳粉，作为锂电池负极材料，利用机械球磨的方法制备了硅<***N lang=EN-US>/<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">石墨复合物<***N lang=EN-US>, <***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">采用<***N lang=EN-US>XRD<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、<***N lang=EN-US>SEM<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以及电化学测试等手段对材料进行了结构表征和性能测试<***N lang=EN-US>.<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">通过球磨不同质量比的硅和石墨<***N lang=EN-US>, <***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">并对相应的复合物进行充放电测试<***N lang=EN-US>, <***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">寻找到了硅和石墨的**比例<***N lang=EN-US>, <***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">其值为<***N lang=EN-US>1<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">∶<***N lang=EN-US>9<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。组成<***N lang=EN-US>Si-C<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">复合材料，可以有效的降低由于硅吸收锂离子时的膨胀，同时可以加大与电解液的亲和力，易与分散，提高循环性能。用纳米**做成纳米硅线用在充电锂电池负极材料里，或者在纳米**表面包覆石墨用做充电锂电池负极材料，可以提高了充电锂电池<***N lang=EN-US>3<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">倍以上的电容量和充放电循环次数。实验结果表明<***N lang=EN-US>, <***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所得材料既具备高于纯纳米硅的循环性能<***N lang=EN-US>, <***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">又具有比石墨高的可逆容量，同时大幅度提高锂电池容量。

<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">当硅与石墨的质量比为<***N lang=EN-US>4:6<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，容量衰减较快<***N lang=EN-US>,25<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">次循环后容量为<***N lang=EN-US>200mA.h/g,<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">故复合物中硅的含量不能太大<***N lang=EN-US>.<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如果硅的含量较大，导致石墨不能很好地将硅分散开，纳米硅之间接触的机会增多，发生团聚，库仑效率和循环性能就会随之下降<***N lang=EN-US>.<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">硅和石墨质量比为<***N lang=EN-US>3:7<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，复合物<***N lang=EN-US>25<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">次循环后的可逆容量虽然大于硅与石墨质量比为<***N lang=EN-US>4:6<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（约<***N lang=EN-US>240mA.h/g<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）时的可逆容量，但从曲线上看出，衰减还是很快<***N lang=EN-US>.<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">可见硅与石墨质量比为<***N lang=EN-US>1:9<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和<***N lang=EN-US>2:8<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，循环性能较好，而<***N lang=EN-US>1:9<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时为**<***N lang=EN-US>.<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由于纳米硅的价格又远高于石墨，故如应用于生产实践，硅和石墨比为<***N lang=EN-US>1:9<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">更为经济<***N lang=EN-US>.<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与纯石墨比较，质量比<***N lang=EN-US>1:9<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的复合物**可逆容量大大提高，是石墨的两倍多<***N lang=EN-US>.<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">循环性能也较好<***N lang=EN-US>,30<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">次循环后达到<***N lang=EN-US>310mA.h/g.

<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">硅及含硅材料作为锂离子电池负极材料具有很高的比容量，硅的理论容量为<***N lang=EN-US>4200mA.h/g<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，机械球磨法制备的石墨<***N lang=EN-US>/<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">纳米硅复合物被用作锂离子电池负极材料<***N lang=EN-US>.<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">该复合材料体现了硅储锂量高及石墨循环性能良好、体积效应小的特点<***N lang=EN-US>.<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">实验结果得出**的硅<***N lang=EN-US>/<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">石墨质量比为<***N lang=EN-US>1:9 .<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电化学性能测试表明复合材料循环性能相对纯硅电极有很大改善且具有高于石墨的可逆容量，有望代替石墨成为新一代锂离子电池负极材料。

<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">作为锂离子电池负极材料，纳米硅（上海超威纳米<***N lang=EN-US>www.cwnano.com<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">提供纳米硅）具有**理论比容量（达<***N lang=EN-US>4200mAh/g)<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，远远高于目前广泛应用的碳材料，但是硅作为锂离子电池负极的**缺点就是在与锂合金化的过程中，伴随着很大的体积变化，在循环过程中会造成活性物质的脱落使容量很快衰减，循环性能很差。目前为了解决这个问题，有研究者把纳米硅<***N lang=EN-US>/<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">纳米氮化钛<***N lang=EN-US>/<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">纳米碳化钛三种材料作为复合材料，实验表明它们具有稳定的循环性能，<***N lang=EN-US>TiN,TiC <***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等相作为惰性组分起到了稳定结构的作用，其作用主要表现在：在放电过程中，对于<***N lang=EN-US>LiSi<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">形成过程中的体积膨胀起到缓冲作用，抑制由于合金粉化，从电极上剥落而引起的容量衰减，在充电过程中，又起到阻止<***N lang=EN-US>Si<***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">微粒团聚的作用。另外，<***N lang=EN-US>TiN,TiC <***N style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等相的导电性都较好，有增强电极导电性的作用。