Combining composition graded positive and negative electrodes for higher performance Li-ion batteries
Combining composition graded positive and negative electrodes for higher performance Li-ion batteries
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DOI：
10.1016/j.jpowsour.2019.227376
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发表时间：
2020-02-01
影响因子：
9.2
通讯作者：
Grant, Patrick S.
中科院分区：
文献类型：
--
作者：
Cheng, Chuan;Drummond, Ross;Grant, Patrick S.
在锂离子电池（LIB）中使用的均匀电极结构导致在电池尺度上的不均匀活性材料利用以及过电位和锂离子浓度的梯度，这对于在高充电-放电速率下的容量保持率和电池寿命都是有害的。为了解释这些梯度，我们证明了与LiFePO 4平行于Li 4 Ti 5 O 12全电池LIB中的常规均匀电极相比，在材料分布中具有工程梯度的异质电极结构可以提高LIB C速率和长期循环性能。C速率性能提高> 120%，容量退化率降低至
Homogeneous electrode structures used in Li-ion batteries (LIB) lead to inhomogeneous active material utilization and gradients of overpotential and Li-ion concentration at the cell-scale, which are detrimental for both capacity retention at high charge-discharge rates and for battery life-time. To account for these gradients, we demonstrate that heterogenous electrode structures with engineered gradients in material distribution can improve LIB C-rate and long-term cycling performance when compared with conventional uniform electrodes in LiFePO4 parallel to Li4Ti5O12 full-cell LIBs. An improvement in C-rate performance of > 120% and a capacity degradation rate reduced to