STEM与日常科技·英语30篇（5）
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Why Solid-State Batteries Struggle at the Electrode-Electrolyte Interface
固态电池为何在电极-电解质界面遭遇瓶颈？
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Solid-state batteries replace flammable liquid electrolytes with rigid ceramic or polymer layers to improve safety.
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But microscopic gaps form where brittle electrodes meet stiff solid electrolytes during repeated charging cycles.
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These tiny voids increase interfacial resistance, causing voltage drops and uneven lithium-ion flow across the cell.
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Manufacturers use hot-pressing or atomic-layer deposition to smooth contact, yet nanoscale defects persist after thermal expansion.
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Unlike liquids that self-heal gaps, solids cannot flow to maintain interface integrity under stress.
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Testing reveals resistance spikes sharply after five hundred cycles unless interfacial coatings like LiNbO₃ are applied.
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Scaling up requires roll-to-roll fabrication methods that preserve nanometer-level surface uniformity across square-meter sheets.
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Researchers now explore quasi-solid hybrids—gel-infused ceramics—to balance stability and contact reliability.
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Even lab prototypes lose ten percent capacity per thousand cycles mainly due to interfacial degradation, not bulk material failure.
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Solving this interface puzzle remains the biggest barrier before mass production of safe, dense energy storage.