Safety shutdown separators
The present invention pertains to electrochemical cells which comprise (a) an anode; (b) a cathode; (c) a solid porous separator, such as a polyolefin, xerogel, or inorganic oxide separator; and (d) a nonaqueous electrolyte, wherein the separator comprises a porous membrane having a microporous coating comprising polymer particles which have not coalesced to form a continuous film. This microporous coating on the separator acts as a safety shutdown layer that rapidly increases the internal resistivity and shuts the cell down upon heating to an elevated temperature, such as 110.degree. C. Also provided are methods for increasing the safety of an electrochemical cell by utilizing such separators with a safety shutdown layer.
- Research Organization:
- Optodot Corporation, Woburn, MA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG02-02ER83542
- Assignee:
- Optodot Corporation (Woburn, MA)
- Patent Number(s):
- 9,070,954
- Application Number:
- 11/786,671
- OSTI ID:
- 1187931
- Resource Relation:
- Patent File Date: 2007 Apr 12
- Country of Publication:
- United States
- Language:
- English
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