Ransil Alan, Belcher Angela M
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
Koch Institute for Integrated Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, USA.
Nat Commun. 2021 Nov 11;12(1):6494. doi: 10.1038/s41467-021-26801-y.
Sodium trisilicate waterglass is an earth-abundant inorganic adhesive which binds to diverse materials and exhibits extreme chemical and temperature stability. Here we demonstrate the use of this material as an electrode binder in a lay-up based manufacturing system to produce structural batteries. While conventional binders for structural batteries exhibit a trade-off between mechanical and electrochemical performance, the waterglass binder is rigid, adhesive, and facilitates ion transport. The bulk binder maintains a Young's modulus of >50 GPa in the presence of electrolyte solvent while waterglass-based electrodes have high rate capability and stable discharge capacity over hundreds of electrochemical cycles. The temperature stability of the binder enables heat treatment of the full cell stack following lay-up shaping in order to produce a rigid, load-bearing part. The resulting structural batteries exhibit impressive multifunctional performance with a package free cell stack-level energy density of 93.9 Wh/kg greatly surpassing previously published structural battery materials, and a tensile modulus of 1.4 GPa.
硅酸钠水玻璃是一种储量丰富的无机粘合剂，可与多种材料结合，并具有极高的化学稳定性和热稳定性。在此，我们展示了这种材料在基于叠层制造系统中用作电极粘合剂以生产结构电池的用途。虽然用于结构电池的传统粘合剂在机械性能和电化学性能之间存在权衡，但水玻璃粘合剂具有刚性、粘性且有助于离子传输。在存在电解质溶剂的情况下，块状粘合剂的杨氏模量保持在>50 GPa，而基于水玻璃的电极具有高倍率性能，并且在数百次电化学循环中具有稳定的放电容量。粘合剂的热稳定性使得在叠层成型后能够对整个电池组进行热处理，从而生产出刚性的承重部件。由此产生的结构电池展现出令人印象深刻的多功能性能，无封装的电池组级能量密度为93.9 Wh/kg，大大超过了先前发表的结构电池材料，拉伸模量为1.4 GPa。
