There are many cross-border power battery companies, many of which have made great achievements in the field of science and technology, such as Huawei, Tencent and Meituan, which mainly invest in related battery companies.

Recently, Bytedance has also come, starting from the perspective of all-solid-state battery research.

Bytedance joins hands with Chinese Academy of Physics

It is understood that Bytedance, in collaboration with Wu Fan's team at the Institute of Physics of the Chinese Academy of Sciences, has proposed an all-solid-state battery configuration combining a new ultra-fast lithium ion conductor Li6.8Si0.8As0.2S5I (LASI-80Si) with a commercialized FeS2 cathode, which not only completely eliminates the shuttle effect of FeS2 and inhibits its volume change, but also improves the battery performance. Due to the relatively low activation energy (0.2 eV) of LASI-80Si and the excellent stability of the FeS2/LASI-80Si interface, the FeS2 all-solid-state battery using LASI-80 Si has a wider operating temperature range (-60 ℃ ~ 60 ℃) than the FeS2 liquid lithium-ion battery. For the first time, an all-solid battery capable of withstanding extremely low detection temperature (-60 ℃) has been realized.

The Li2S and LiI functional phases were also investigated to provide additional capacity, as well as significantly enhanced lithium ion diffusion coefficient/pseudocapacitive contribution and electrode reaction kinetics. The unique properties of LASI-80Si electrolyte finally guarantee the long cycle life (244 cycles at 0.1 C and 600 cycles at 1 C), excellent rate capability (20 C), high areal loading (13.37 mg cm − 2) and high areal capacity (9.05 mAh cm − 2) of the FeS2 all-solid-state battery.

These results indicate that the combination of LASI-80Si solid electrolyte and FeS2 cathode has great potential in the practical application of all-solid-state batteries with wide temperature range and large capacity!

跨界动力电池的企业很多，当中不乏在科技领域取得巨大成就的企业，例如华为、腾讯、美团等，他们以投资相关电池企业为主。

近日，字节跳动也来了，它从全固态电池研究角度切入。

字节跳动携手中科物理院

据了解，字节跳动与中科院物理所吴凡团队合作，提出一种新型超快锂离子导体Li6.8Si0.8As0.2S5I（LASI-80Si）与商业化的FeS2正极组合的全固态电池构型，除了完全消除FeS2的穿梭效应和抑制其体积变化之外，由于LASI-80Si相对较低的活化能（0.2eV）和优异的FeS2/LASI-80Si界面稳定性，使用LASI-80Si的FeS2 全固态电池相比FeS2 液态锂离子电池具有更宽的工作温度范围（-60℃~60℃），首次实现了能够承受极低探测温度（-60℃）的全固电池。

还研究了Li2S和LiI功能相提供额外容量，以及显著增强的锂离子扩散系数/赝电容贡献和电极反应动力学。LASI-80Si电解质具有的独特性质最终保证了FeS2 全固态电池的长循环寿命（在0.1C下244次循环，在1C下600次循环）、优异的倍率性能（20C）、高面负载（13.37 mg cm-2）和高面容量（9.05 mAh cm-2）。

这些结果表明，LASI-80Si 固态电解质和FeS2正极组合在宽温域和大容量全固态电池的实际应用中具有巨大潜力！

注：该成果以“Wide-temperature, Long-cycling, and High-loading Pyrite All-solid-state Batteries Enabled by Argyrodite Thioarsenate Superionic Conductor”为题发表在国际知名期刊Advanced Functional Materials (IF=19.924)。