摘要
With the proliferation of energy storage and power applications, electric vehicles particularly, solid-state batteries are considered as one of the most promising strategies to address the ever-increasing safety concern and high energy demand of power devices. Here, we demonstrate the Al4B2O9 nanorods-modified poly(ethylene oxide) (PEO)-based solid polymer electrolyte (ASPE) with high ionic conductivity, wide electrochemical window, decent mechanical property and nonflammable performance. Specifically, because of the longer-range ordered Li+ transfer channels conducted by the interaction between Al4B2O9 nanorods and PEO, the optimal ASPE (ASPE-1) shows excellent ionic conductivity of 4.35×10^−1 and 3.1×10^−1 S cm^−1 at 30 and 60℃, respectively. It also has good electrochemical stability at 60℃ with a decomposition voltage of 5.1 V. Besides, the assembled LiFePO4//Li cells show good cycling performance, delivering 155 mA h g−1 after 300 cycles at 1 C under 60℃, and present excellent low temperature adaptability, retaining over 125 mA h g^−1 after 90 cycles at 0.2 C under 30℃. These results verify that the addition of Al4B2O9 nanorods can effectively promote the integrated performance of solid polymer electrolyte.
随着储能设备和电力驱动产品的激增,特别是电动汽车的大规模推广应用,全固态电池被认为是最有可能解决电动设备日益严峻的安全问题和高能量密度需求的策略之一.本文报道了一种Al4B2O9纳米棒改性的聚环氧乙烷(PEO)基固体聚合物电解质(ASPE),其具有高离子电导率、宽电化学窗口、良好的机械性能和阻燃性能.具体来说,因为Al4B2O9纳米棒与PEO之间的相互作用会产生更长距离的Li^+传递通道,所以ASPE-1具有优异的离子电导率,在30和60℃下,分别达到3.1×10^-4和4.35×10^-5S cm^-1.此外,ASPE-1在60℃时表现出良好的电化学稳定性,分解电压达5.1 V.另外,ASPE-1在LiFePO4//Li半电池具有良好的循环倍率性能,当温度为60°C、电流密度为1C时,经300次循环充放电后,放电比容量为155 mA hg^-1.当温度为30℃、电流密度为0.2 C时,经90次循环充放电后,放电比容量为125 mA hg^-1,表现出良好的低温性能.这些实验结果证明Al4B2O9纳米棒可以有效地提高固体聚合物电解质的综合性能.
作者
Xiqiang Guo
Wenjie Peng
Yuqi Wu
Huajun Guo
Zhixing Wang
Xinhai Li
Yong Ke
Lijue Wu
Haikuo Fu
Jiexi Wang
郭西强;彭文杰;吴雨琪;郭华军;王志兴;李新海;柯勇;吴理觉;付海阔;王接喜(School of Metallurgy and Environment,Central South University,Changsha,410083,China;Engineering Research Center of the Ministry of Education for Advanced Battery Materials,Central South University,Changsha,410083,China;Guangdong Jiana Energy Technology Co.Ltd.,Qingyuan,513056,China)
基金
financially supported by the National Natural Science Foundation of China (51804344)
the Huxiang Youth Talent Support Program (2019RS2002)
the Innovation and Entrepreneurship Project of Hunan Province,China (2018GK5026)
the Innovation-Driven Project of Central South University (2020CX027)
Guangdong Yang Fan Plan for Postdoctor Program
