Amorphous and partially amorphous nanoscale ion storage materials
AssigneeA123 Systems, Inc.
InventorsYet-Ming CHIANG, Anthony E. PULLEN, Nonglak MEETHONG
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Abstract
Amorphous or partially amorphous nanoscale ion storage materials are provided. For example, lithium transition metal phosphate storage compounds are nanoscale and amorphous or partially amorphous in an as-prepared state, or become amorphous or partially amorphous upon electrochemical intercalation or de-intercalation by lithium. These nanoscale ion storage materials are useful for producing devices such as high energy and high power storage batteries.
Claims31
A compound having the formula LiaCbMcNdXeOf, wherein M is one or more first-row transition metals;
- N is an element from Groups IIA, IIIA, IVA, VA, VIA, IIB, IIIB or VIIB of the periodic table;
- X is one or more of P, Si, Ge, As, S;
- 0≦a≦1;
- 0.001≦b≦0.10;
- 0.8≦c≦1.2;
- 0≦d≦0.10;
- 0.9≦e≦2.2;
- and 3.6≦f≦8.8.
An amorphous nanoscale lithium transition metal phosphate material containing carbon at a concentration between about 0.1% and about 10% by mole relative to the transition metal concentration, and including an electrochemically active, amorphous Li—M—P—O—C phase, where M is one or more first row transition metals.
Dependencies are inferred from the claim text.