High performance of LiNi0.5Mn0.5O2 positive electrode boosted by ordered three-dimensional nanostructures
High performance of LiNi0.5Mn0.5O2 positive electrode boosted by ordered three-dimensional nanostructures
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DOI：
10.1016/j.jpowsour.2012.01.069
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发表时间：
2012-05
影响因子：
9.2
通讯作者：
Yumin Liu;Yumin Liu;Fengxin Cao;Bolei Chen;Xingzhong Zhao;S. Suib;H. L. Chan;Jikang Yuan
中科院分区：
文献类型：
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作者：
Yumin Liu;Yumin Liu;Fengxin Cao;Bolei Chen;Xingzhong Zhao;S. Suib;H. L. Chan;Jikang Yuan
以树枝状结构的锰钾矿型八面体分子筛二氧化锰（OMS-2）为模板，原位合成了三维LiNi 0. 5 Mn 0. 5 O2（3D-LiNi 0. 5 Mn 0. 5 O2）纳米结构。通过XRD、FE-SEM、TEM和HR-TEM证实了OMS-2前驱体完全转化为层状α-NaFeO 2型LiNi 0. 5 Mn 0. 5 O2，并保留了三维树枝状纳米结构。合成的纳米结构的正极表现出显着改善的倍率性能和循环可逆性，由于其独特的纳米结构组成的单晶LiNi0.5Mn0.5O2纳米棒。研究了纳米LiNi 0. 5 Mn 0. 5 O2正极材料的组装方式对其电化学性能的影响。基于3D-LiNi 0. 5 Mn 0. 5 O2的电池在50次循环后保持151.6mAhg−1的放电容量（首次放电容量的93%）。在3.2C的倍率下保持了141.8mAhg− 1的放电比容量，约为0.2C倍率下容量的80%。
Three-dimensional LiNi0.5Mn0.5O2(3D-LiNi0.5Mn0.5O2) nanostructures are in situ prepared using cryptomelane-type octahedral molecular sieve manganese dioxide (OMS-2) in the form of dendritic nanostructures as templates. The complete conversion of the OMS-2 precursor to layered α-NaFeO2-type LiNi0.5Mn0.5O2and the retention of the 3D dendritic nanostructures have been confirmed by XRD, FE-SEM, TEM, and HR-TEM. The as-synthesized nanostructured positive electrode exhibits a significant improvement in rate performance and cycling reversibility due to its unique nanostructures composed of single-crystalline LiNi0.5Mn0.5O2nanorods. And the influence of the assembly mode of nanosize LiNi0.5Mn0.5O2positive electrode material to its electrochemical performances has been investigated. The battery based on 3D-LiNi0.5Mn0.5O2retains a discharge capacity of 151.6mAhg−1(93% of the first discharge capacity) after 50 cycles. A specific discharge capacity of 141.8mAhg−1was retained at a rate of 3.2C, which is about 80% of the capacity at a rate of 0.2C.