当前位置：
X-MOL 学术
›
ACS Appl. Mater. Interfaces
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Enabling Ether-Based Electrolytes for Long Cycle Life of Lithium-Ion Batteries at High Charge Voltage
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-11-23 , DOI: 10.1021/acsami.0c18177 Hao Jia 1 , Yaobin Xu 2 , Sarah D. Burton 2 , Peiyuan Gao 3 , Xianhui Zhang 1 , Bethany E. Matthews 1 , Mark H. Engelhard 2 , Lirong Zhong 1 , Mark E. Bowden 2 , Biwei Xiao 1 , Kee Sung Han 3 , Chongmin Wang 2 , Wu Xu 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-11-23 , DOI: 10.1021/acsami.0c18177 Hao Jia 1 , Yaobin Xu 2 , Sarah D. Burton 2 , Peiyuan Gao 3 , Xianhui Zhang 1 , Bethany E. Matthews 1 , Mark H. Engelhard 2 , Lirong Zhong 1 , Mark E. Bowden 2 , Biwei Xiao 1 , Kee Sung Han 3 , Chongmin Wang 2 , Wu Xu 1
Affiliation
|
Lithium-ion batteries (LIBs) with high-nickel (Ni) content LiNixMnyCozO2 (x + y + z = 1) (NMC with Ni ≥ 0.6) cathodes operated at high charge voltages have been considered as one of the most promising candidates for addressing the challenge of increasing energy density demand. Conventional LiPF6–organocarbonate electrolytes exhibit incompatibility with such cell chemistries under certain testing conditions because of the instability of electrode/electrolyte interphases. In response to this challenge, ether-based electrolytes with finely tuned structure and composition of solvation sheaths were developed and evaluated in graphite (Gr)∥NMC811 cell chemistry in 2.5–4.4 V, despite ethers being conventionally considered to be unfavorable electrolyte solvents for LIBs because of their anodic instability above 4.0 V and cointercalation into Gr electrodes. The functional ether-based electrolytes in this work enable both excellent cycle life and high rate capability of Gr∥NMC811 cells. Mechanistic studies reveal that the unique structure and composition of the solvation sheath of the functional ether electrolytes are the main reasons behind their excellent anodic stability and effective protection of the Gr electrode and, consequently, the extraordinary cell performances when operated at high charge cutoff voltages. This work also provides a feasible approach in developing highly stable functional electrolytes for high-energy density LIBs.
中文翻译：
使基于醚的电解质在高充电电压下具有更长的锂离子电池循环寿命
具有高镍（Ni）含量的LiNi x Mn y Co z O 2（x + y + z = 1）（Ni≥0.6的NMC）阴极在高充电电压下运行的锂离子电池（LIB）被认为是一种应对能源密度需求不断增长的挑战的最有希望的候选人之一。常规LiPF 6在某些测试条件下，由于电极/电解质界面的不稳定性，有机碳酸酯电解质与此类电池化学物质不兼容。为应对这一挑战，尽管在传统上认为醚是不利于LIB的电解质溶剂，但仍在2.5（Gr）graphiteNMC811电池化学中开发并微调了溶剂化鞘的结构和组成的基于醚的电解质，并对其进行了评估。因为它们在4.0 V以上的阳极不稳定性以及共嵌入Gr电极中。这项功能性的基于醚的电解质可实现出色的循环寿命和Gr∥NMC811电池的高倍率能力。机理研究表明，功能性醚电解质的溶剂化鞘层的独特结构和组成是其出色的阳极稳定性和对Gr电极的有效保护的主要原因，因此，在高电荷截止电压下工作时，电池具有出色的性能。这项工作还为开发用于高能量密度LIB的高度稳定的功能电解质提供了一种可行的方法。
更新日期：2020-12-09
中文翻译：
使基于醚的电解质在高充电电压下具有更长的锂离子电池循环寿命
具有高镍（Ni）含量的LiNi x Mn y Co z O 2（x + y + z = 1）（Ni≥0.6的NMC）阴极在高充电电压下运行的锂离子电池（LIB）被认为是一种应对能源密度需求不断增长的挑战的最有希望的候选人之一。常规LiPF 6在某些测试条件下，由于电极/电解质界面的不稳定性，有机碳酸酯电解质与此类电池化学物质不兼容。为应对这一挑战，尽管在传统上认为醚是不利于LIB的电解质溶剂，但仍在2.5（Gr）graphiteNMC811电池化学中开发并微调了溶剂化鞘的结构和组成的基于醚的电解质，并对其进行了评估。因为它们在4.0 V以上的阳极不稳定性以及共嵌入Gr电极中。这项功能性的基于醚的电解质可实现出色的循环寿命和Gr∥NMC811电池的高倍率能力。机理研究表明，功能性醚电解质的溶剂化鞘层的独特结构和组成是其出色的阳极稳定性和对Gr电极的有效保护的主要原因，因此，在高电荷截止电压下工作时，电池具有出色的性能。这项工作还为开发用于高能量密度LIB的高度稳定的功能电解质提供了一种可行的方法。
京公网安备 11010802027423号