Realizing simultaneously enhanced energy and power density full-cell construction using mixed hard carbon/Li4Ti5O12 electrode
Realizing simultaneously enhanced energy and power density full-cell construction using mixed hard carbon/Li4Ti5O12 electrode
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使用混合硬碳/Li4Ti5O12电极实现同时增强能量和功率密度的全电池结构
DOI：
10.1007/s12598-019-01312-4
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发表时间：
2019-07
期刊：
影响因子：
8.8
通讯作者：
Zhao Yu-Feng
中科院分区：
文献类型：
--
作者：
Huang Shi-Fei;Lv Yao;Tie Da;Yu Yang;Zhao Yu-Feng
摘要高能量和高功率密度锂离子电池的实际应用迫切需要合适的充放电平台、快速的电荷转移动力学以及最佳的固体电解质界面层电极材料。以工业LiNi0.33Co0.33Mn0.33O2（NCM 111）为正极，Li 4 Ti 5 O 12（LTO）/硬碳（HC）为负极，组装了高性能锂离子电池（LIB）.这表明，LTO和HC之间的组分比在操纵电导率和电反应平台方面起着关键作用。电化学测试结果表明，当HC含量为10wt%时，所构建的全电池表现出最佳的电化学性能，在10 A·g-1（30 C）下，最大能量密度为149.2 Wh·kg-1，最大功率密度为2195 W·kg-1。这优于我们的工作范围内的所有组装系统和最先进的文献。NCM//Li 4 Ti 5 O 12 + 10wt%HC电池体系在1A·g-1的电流密度下循环1000次后也表现出良好的容量保持率。本工作提供了一种新的方法，以提高全电池的性能，通过混合电极材料具有不同的充电电位和反应动力学。图形摘要
Abstract Practical applications of lithium-ion batteries (LIBs) with both high energy and power density are urgently demanded, which require suitable charge/discharge platform, fast charge-transfer kinetics, as well as optimal solid electrolyte interphase (SEI) layer of electrode materials. In this work, a high-performance lithium-ion battery (LIB) full cell was assembled by using commercial LiNi 0.33 Co 0.33 Mn 0.33 O 2 (NCM111) as the positive electrode and mixed Li 4 Ti 5 O 12 (LTO)/hard carbon (HC) as the negative electrode. It reveals that the component ratio between LTO and HC plays a critical role in manipulating the electric conductivity and the electro-reaction platform. The electrochemical test results show that when the content of HC is 10 wt%, the as-constructed full cell demonstrates the best electrochemical, with a maximum energy density of 149.2 Wh·kg −1 and a maximum power density of 2195 W·kg −1 at 10 A·g −1 (30C). This outperforms all the assembled systems within our work range and the state-of-the-art literatures. The NCM//Li 4 Ti 5 O 12 + 10 wt% HC battery system also exhibits a good capacity retention after 1000 cycles at the current density of 1 A·g −1 . This work provides a new approach to enhance the full-cell performance by mixing electrode materials with different charge potentials and reaction kinetics. Graphic abstract
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