Preventing lithium dendrite-related electrical shorting in rechargeable batteries by coating separator with a Li-killing additive,Journal of Materials Chemistry A

当前位置： X-MOL 学术 › J. Mater. Chem. A › 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.)

Preventing lithium dendrite-related electrical shorting in rechargeable batteries by coating separator with a Li-killing additive
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-05-14 00:00:00 , DOI: 10.1039/c8ta02804d
Sheng S. Zhang _{1,

2,

3,

4,

5} , Xiulin Fan _{6,

7,

8,

9} , Chunsheng Wang _{6,

7,

8,

9}

Affiliation

Dendritic electrodeposition is an intrinsic feature of Li metal, and Li dendrite-related electrical shorting is a major cause of thermal runaway in Li metal batteries. In order to prevent such electrical shorting, a Li-killing layer consisting of TiO₂ nanoparticles embedded in a porous Kynar polymer matrix is coated onto one side of a conventional Celgard separator and faced to the cathode. After filling with liquid electrolyte, the Kynar polymer swells to a gel while TiO₂ serves as a Li-killer by reacting with the Li dendrites that penetrate through the separator. Additionally, the Li-killing layer increases the thermal dimensional stability of the separator, and the wettability, uptake and uphold of the liquid electrolyte. It is shown that a Li/Cu cell with the Li-killing layer does not undergo electrical shorting even if the Li metal is entirely plated onto the counter electrode, whereas an identical cell using a pristine separator rapidly experiences shorting. Moreover, the Li-killing layer increases the rate capability and capacity retention of a Li/LiNi_0.80Mn_0.10Co_0.10O₂ cell. Impedance analysis reveals that such improvements are attributed to increased electrolyte uptake and uphold, which consequently reduces the solid electrolyte interphase resistance and charger-transfer resistance.

中文翻译：

通过在隔膜上涂锂灭活剂来防止可充电电池中与树枝状锂相关的电气短路

树枝状电沉积是锂金属的固有特征，与锂枝晶相关的电短路是锂金属电池中热失控的主要原因。为了防止这种电短路，将由嵌入多孔Kynar聚合物基体中的TiO ₂纳米颗粒组成的Li杀死层涂覆在常规Celgard隔板的一侧上并面对阴极。填充液体电解质后，Kynar聚合物溶胀成凝胶，而TiO ₂通过与渗透到隔膜中的锂枝晶反应，可以起到锂杀手的作用。另外，Li杀灭层增加了隔板的热尺寸稳定性，以及液体电解质的润湿性，吸收性和保持性。结果表明，即使将Li金属完全镀在对电极上，具有Li杀灭层的Li / Cu电池也不会发生电短路，而使用原始隔膜的相同电池很快会发生短路。而且，Li杀死层提高了Li / LiNi _0.80 Mn _0.10 Co _0.10 O ₂的倍率能力和容量保持率。细胞。阻抗分析表明，这种改进归因于电解质吸收和保持能力的提高，因此降低了固体电解质的相间电阻和电荷转移电阻。

更新日期：2018-05-14

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11