Protective coatings for negative electrodes

Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode

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4292319, 429104, 429105, 4292181, 429300, 429303, 429338, 427 78, 4271262, 4271263, 4272552, 4272557, H01M 458

Patent

active

060250941

ABSTRACT:
Disclosed is an alkali metal negative electrode having a protective layer. Specifically, the disclosed negative electrode includes a glassy or amorphous surface protective layer which conducts alkali metal ions but effectively blocks the alkali metal in the electrode from direct contact with the ambient. The protective layer has improved smoothness and reduced internal stress in comparison to prior protective layers such as those formed by sputtering. In a specific embodiment, the protective layer is formed on the lithium metal electrode surface by a plasma assisted deposition technique.

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