《全固态锂电池界面问题的新解决方案》
在未来的电力存储技术中，全固态锂电池（SSLBs）因为其显著提升的安全性、能量密度和充电能力，正受到越来越多的关注。然而，它在发展过程中也面临着一些挑战。在SSLBs里，聚合物与陶瓷的界面兼容性不佳、陶瓷颗粒严重团聚以及电极/电解质界面离子传导不连续等问题，严重限制了锂离子（Li⁺）的传输，阻碍了其大规模应用和制造。为了解决这些问题，科学家们采用了新的方法。他们将石榴石型的Li₇La₃Zr₂O₁₂（LLZO）纳米颗粒引入聚丙烯腈（PAN）纳米纤维中，制造出一种聚合物 - 陶瓷纳米纤维增强的超薄固态电解质（SSE）膜（3D LLZO - PAN）。通过纳米纤维的限制作用，让LLZO纳米颗粒聚集起来，构建了锂离子的连续传导通道。同时，还设计了一种新颖的集成静电纺丝工艺，使正极与电解质界面之间形成紧密的物理接触。而且，聚丙烯腈（PAN）、聚环氧乙烷（PEO）和双（三氟甲磺酰）亚胺锂（LiTFSI）的协同作用，有助于形成稳定的固体电解质界面（SEI）层。这种新的固态电解质膜具有很多优点。它的厚度超薄，仅为16μm；离子传输速度快，达到2.9×10⁻⁴ S cm⁻¹；界面接触性能优异，电阻低至15.6Ω。在Li|3D LLZO - PAN|Li电池中，能在0.2 mA cm⁻²的电流密度下实现长达1500小时的循环。LiNi₀.₈Co₀.₁Mn₀.₁O₂|3D LLZO - PAN|Li电池在0.5 C的倍率下可以循环超过200次。采用实际LiNi₀.₈Co₀.₁Mn₀.₁O₂||Li配置的软包电池实现了345.8 Wh kg⁻¹的超高能量密度和良好的安全性能。这项研究为高能量密度全固态锂电池的制造和应用提供了新的策略，有望推动全固态锂电池在更多领域的大规模应用。
期刊
infomat
标题
Addressing the interface issues of all-solid-state lithium batteries by ultra-thin composite solid-state electrolyte combined with the integrated preparation technology
作者
Xiaoxue Zhao, Chao Wang, Xiaomeng Fan, Yang Li, Dabing Li, Yanling Zhang, Li-Zhen Fan
摘要
The interfacial engineering in solid-state lithium batteries (SSLBs) is attracting escalating attention due to the profoundly enhanced safety, energy density, and charging capabilities of future power storage technologies. Nonetheless, polymer/ceramic interphase compatibility, serious agglomeration of ceramic particles, and discontinuous ionic conduction at the electrode/electrolyte interface seriously limit Li+ transport in SSLBs and block the application and large-scale manufacturing. Hence, garnet Li7La3Zr2O12 (LLZO) nanoparticles are introduced into the polyacrylonitrile (PAN) nanofiber to fabricate a polymer-ceramic nanofiber-enhanced ultrathin SSE membrane (3D LLZO-PAN), harnessing nanofiber confinement to aggregate LLZO nanoparticles to build the continuous conduction pathway of Li+. In addition, a novel integrated electrospinning process is deliberately designed to construct tight physical contact between positive electrode/electrolyte interphases. Importantly, the synergistic effect of the PAN, polyethylene oxide (PEO), and lithium bis((trifluoromethyl)sulfonyl)azanide (LiTFSI) benefits a stable solid electrolyte interphase (SEI) layer, resulting in superior cycling performance, achieving a remarkable 1500 h cycling at 0.2 mA cm−2 in the Li|3D LLZO-PAN|Li battery. Consequently, the integrated polymer-ceramic nanofiber-enhanced SSEs simultaneously achieve the balance in ultrathin thickness (16 μm), fast ion transport (2.9 × 10−4 S cm−1), and superior excellent interface contact (15.6 Ω). The LiNi0.8Co0.1Mn0.1O2|3D LLZO-PAN|Li batteries (2.7–4.3 V) can work over 200 cycles at 0.5 C. The pouch cells with practical LiNi0.8Co0.1Mn0.1O2||Li configuration achieve an ultrahigh energy density of 345.8 Wh kg−1 and safety performance. This work provides new strategies for the manufacturing and utilization of high-energy-density SSLBs.
原文链接
https://onlinelibrary.wiley.com/doi/10.1002/inf2.70012
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静远嘲风（MY Scimage） 成立于2007年，嘲风取自中国传统文化中龙生九子，子子不同的传说，嘲风为守护屋脊之瑞兽，喜登高望远；静远取自成语“宁静致远”，登高莫忘初心，远观而不可务远。
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