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Boosting the Temperature Adaptability of Lithium Metal Batteries via a Moisture/Acid-Purified, Ion-Diffusion Accelerated Separator
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-07-08 , DOI: 10.1002/aenm.202201390 Min Zhang 1 , Kexin Liu 2 , Yichen Gan 1 , Helin Wang 1 , Fu Liu 1 , Miao Bai 1 , Xiaoyu Tang 1 , Zhiqiao Wang 1 , Shaowen Li 1 , Ahu Shao 1 , Kefan Zhou 1 , Tianyu Wang 1 , Zhuyi Wang 2 , Shuai Yuan 2 , Yue Ma 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-07-08 , DOI: 10.1002/aenm.202201390 Min Zhang 1 , Kexin Liu 2 , Yichen Gan 1 , Helin Wang 1 , Fu Liu 1 , Miao Bai 1 , Xiaoyu Tang 1 , Zhiqiao Wang 1 , Shaowen Li 1 , Ahu Shao 1 , Kefan Zhou 1 , Tianyu Wang 1 , Zhuyi Wang 2 , Shuai Yuan 2 , Yue Ma 1
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The reliable operation of Li metal batteries suffers from cathode collapse due to high-voltage cycling, interfacial reactivity of the Li deposits, self-discharge at the elevated temperatures, as well as the power output deterioration in low-temperature scenarios. In contrast to the individual electrode optimization, herein, a hetero-layered separator with an asymmetric functional coating on polyethylene is proposed in response to the aforementioned issues: On the face-to-cathode side, the hybrid layer of the molecular sieve and sulfonated melamine formaldehyde can scavenge the hydrofluoric acid and moisture residues from the carbonate electrolyte, maintaining the cathode robustness in both the high-voltage cycling or high-temperature storage scenarios; while the pre-coated Ag2S layer in situ generates the Li10Ag3-Li2S composite matrix in contact with the Li foil, promoting interfacial ion diffusion and isotropic Li deposition. The as-constructed LiNi0.8Co0.1Mn0.1O2/Li pouch cell (3.2 Ah) with the hetero-layered separator can achieve a high energy density of 400.6 Wh kg−1 on the cell level, as well as a wider temperature adaptability (0–75 °C). This asymmetric separator strategy enables facile energy-dense cell prototyping with the commercial electrode/electrolyte.
中文翻译：
通过水分/酸纯化、离子扩散加速分离器提高锂金属电池的温度适应性
由于高电压循环、锂沉积物的界面反应性、高温下的自放电以及低温情况下的功率输出恶化，锂金属电池的可靠运行会受到阴极坍塌的影响。与单个电极优化相比，本文针对上述问题提出了一种在聚乙烯上具有不对称功能涂层的异质层隔膜：在正极面，分子筛和磺化三聚氰胺的混合层甲醛可以清除碳酸盐电解质中的氢氟酸和水分残留物，从而在高压循环或高温储存场景中保持正极的稳定性；而预涂覆的 Ag 2 S 层原位产生 Li10 Ag 3 -Li 2 S 复合基体与锂箔接触，促进界面离子扩散和各向同性锂沉积。所构建的具有异质层隔膜的LiNi 0.8 Co 0.1 Mn 0.1 O 2 /Li软包电池（3.2 Ah）可以在电池水平上实现400.6 Wh kg -1的高能量密度，以及更广泛的温度适应性（0-75°C）。这种不对称的隔膜策略可以使用商业电极/电解质轻松进行能量密集型电池原型设计。
更新日期：2022-07-08
中文翻译：
通过水分/酸纯化、离子扩散加速分离器提高锂金属电池的温度适应性
由于高电压循环、锂沉积物的界面反应性、高温下的自放电以及低温情况下的功率输出恶化，锂金属电池的可靠运行会受到阴极坍塌的影响。与单个电极优化相比，本文针对上述问题提出了一种在聚乙烯上具有不对称功能涂层的异质层隔膜：在正极面，分子筛和磺化三聚氰胺的混合层甲醛可以清除碳酸盐电解质中的氢氟酸和水分残留物，从而在高压循环或高温储存场景中保持正极的稳定性；而预涂覆的 Ag 2 S 层原位产生 Li10 Ag 3 -Li 2 S 复合基体与锂箔接触，促进界面离子扩散和各向同性锂沉积。所构建的具有异质层隔膜的LiNi 0.8 Co 0.1 Mn 0.1 O 2 /Li软包电池（3.2 Ah）可以在电池水平上实现400.6 Wh kg -1的高能量密度，以及更广泛的温度适应性（0-75°C）。这种不对称的隔膜策略可以使用商业电极/电解质轻松进行能量密集型电池原型设计。
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