EP 2118007 A2 20091118 - MIXED LITHIUM SILICATES
Title (en)
MIXED LITHIUM SILICATES
Title (de)
GEMISCHE LITHIUMSILIKATE
Title (fr)
SILICATES MIXTES DE LITHIUM.
Publication
Application
Priority
- FR 2008000148 W 20080207
- FR 0700932 A 20070209
Abstract (en)
[origin: FR2912398A1] A method for the preparation of mixed silicates of lithium and iron, cobalt, manganese or nickel in the form of spherical, non-agglomerated particles in the size range 400-600 nm, involves heating an aqueous mixture of the corresponding precursors at between 60[deg] C and the boiling point and at pH 10-14 until precipitation is complete and then separating and drying the product. A method for the preparation of compounds of formula Li 2M I>I 1-xM I>II xSiO 4(OH) x(I), in which M : iron, cobalt, manganese or nickel; x : 0-1 , in the form of substantially spherical, non-coalesced particles with a particle size of 400-600 nm, showing a structure in space group Pna2 1and possibly Pccn. The method involves (a) making an aqueous mixture of the precursors, (b) heating under atmospheric pressure to a temperature (Tp) between 60[deg] C and the boiling point, maintaining the temperature until the formation and precipitation of (I) is complete, (c) separating the precipitate and drying. Stage (a) involves adding the precursors of M, silicon and lithium to water and adjusting the solution to pH 10-14; stages (a) and (b) are carried out with stirring. Independent claims are also included for (1) silicates of formula (I) as described above (2) active positive electrode material comprising (I), for electrochemical devices (3) positive electrodes for such devices, containing (I) as active material (4) batteries comprising positive and negative electrodes separated by an electrolyte consisting of a solution of lithium salt, in which the positive electrode contains (I) as above .
IPC 8 full level
C01B 33/32 (2006.01); H01M 4/131 (2010.01); H01M 4/1391 (2010.01); H01M 4/48 (2010.01); H01M 4/485 (2010.01); H01M 4/50 (2010.01); H01M 4/505 (2010.01); H01M 4/52 (2010.01); H01M 4/525 (2010.01); H01M 10/052 (2010.01); H01M 10/36 (2010.01); H01M 10/0525 (2010.01)
CPC (source: EP)
C01B 33/32 (2013.01); H01M 4/131 (2013.01); H01M 4/1391 (2013.01); H01M 4/485 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/052 (2013.01); H01M 10/0525 (2013.01); Y02E 60/10 (2013.01)
Citation (search report)
See references of WO 2008107571A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
FR 2912398 A1 20080815; FR 2912398 B1 20090424; CA 2677711 A1 20080912; CN 101652321 A 20100217; EP 2118007 A2 20091118; JP 2010517913 A 20100527; WO 2008107571 A2 20080912; WO 2008107571 A3 20090625
DOCDB simple family (application)
FR 0700932 A 20070209; CA 2677711 A 20080207; CN 200880010766 A 20080207; EP 08761851 A 20080207; FR 2008000148 W 20080207; JP 2009548714 A 20080207