High-Rate Layered Cathode of Lithium-Ion Batteries through Regulating Three-Dimensional Agglomerated Structure
High-Rate Layered Cathode of Lithium-Ion Batteries through Regulating Three-Dimensional Agglomerated Structure
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DOI：
10.3390/en13071602
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发表时间：
2020-04
期刊：
影响因子：
3.2
通讯作者：
Junping Hu;H. Sheng;Qi Deng;Q. Ma;Jun Liu;Xiongwei Wu;Junjie Liu;Yuping Wu
中科院分区：
文献类型：
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作者：
Junping Hu;H. Sheng;Qi Deng;Q. Ma;Jun Liu;Xiongwei Wu;Junjie Liu;Yuping Wu
LiNixCoyMnzO2(LNCM)层状材料被认为是最有前途的高能锂离子电池正极材料，但存在倍率性能差、寿命短等缺点。此外，LiNi1/3Co1/3Mn1/3O2(NCM 111)由于其高的能量密度和良好的安全性而被认为是应用最广泛的LNCM阴极之一。为此，通过控制尿素用量，设计了一种半封闭结构的NCM111，具有高倍率性能和长寿命，在0.85A·g−1和1.70A·g−1下分别表现出140.9 mAh.g−1和114.3 mAh.g−1。半封闭结构有利于电解液的渗透和锂离子在电极材料内部的快速传递，从而提高电池的倍率性能。我们的工作为设计高倍率的层状正极材料提供了一种有效的策略。
LiNixCoyMnzO2 (LNCM)-layered materials are considered the most promising cathode for high-energy lithium ion batteries, but suffer from poor rate capability and short lifecycle. In addition, the LiNi1/3Co1/3Mn1/3O2 (NCM 111) is considered one of the most widely used LNCM cathodes because of its high energy density and good safety. Herein, a kind of NCM 111 with semi-closed structure was designed by controlling the amount of urea, which possesses high rate capability and long lifespan, exhibiting 140.9 mAh·g−1 at 0.85 A·g−1 and 114.3 mAh·g−1 at 1.70 A·g−1, respectively. The semi-closed structure is conducive to the infiltration of electrolytes and fast lithium ion-transfer inside the electrode material, thus improving the rate performance of the battery. Our work may provide an effective strategy for designing layered-cathode materials with high rate capability.