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带电晶界限制石榴石固态电解质抗短路性能
原标题：Charged grain boundaries limit short-circuit endurance in garnet solid-state battery electrolytes - Nature
精华摘要
《自然》期刊发表研究指出，石榴石型固态电解质（锂镧锆氧）的晶界处存在离子本征电荷，锂空位在界面聚集产生约-0.15V局部电势（20°C），该电势改变载流子分布，导致晶界电子电导率升高，成为锂金属优先成核位点，在恒流循环中引发内部短路。研究通过实验和建模揭示了晶界电荷对固态电池失效的关键作用。
该发现直接挑战了固态电池商业化进程：晶界电荷效应意味着仅通过致密化无法完全解决短路问题，需开发晶界工程策略（如掺杂或界面修饰）来调控局部电势。对宁德时代、丰田等押注氧化物固态电池的企业而言，这一机制可能成为技术突破的瓶颈，同时也为材料改性提供了明确方向——降低晶界空位浓度或引入补偿电荷。投资者需关注相关专利和后续中试数据。
原文摘要
# Charged grain boundaries limit short-circuit endurance in garnet solid-state battery electrolytes. Grain boundaries in lithium lanthanum zirconate solid-state electrolytes feature elevated electronic conduction and act as preferential sites for the nucleation of electrically isolated lithium metal during galvanostatic cycling in battery cells. Here we show that lithium lanthanum zirconate grain boundaries carry ionic built-in charge, with lithium vacancies accumulating at the interface generating localized electric potentials (−0.15 V at 20 °C). This potential alters carrier distributions ne