US2016072122A1PendingUtilityA1

Lithium batteries containing lithium-bearing iron phosphate and carbon

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Assignee: PRAYONPriority: Jan 28, 2010Filed: Nov 18, 2015Published: Mar 10, 2016
Est. expiryJan 28, 2030(~3.5 yrs left)· nominal 20-yr term from priority
Inventors:Sébastien PatouxSebastien MartinetSébastien LaunoisAlain GourgueAlain GermeauIsabelle Willems
C01G 53/82H01M 2004/021H01M 2004/028H01M 10/0525H01M 4/625H01M 4/587H01M 4/364C01G 49/009H01M 4/5825Y02E60/10C01P 2002/54C01P 2002/72C01P 2004/51C01P 2004/52C01P 2004/62C01P 2004/03C01P 2006/12C01P 2002/52C01P 2006/40C01P 2006/11C01P 2004/61H01M 4/362
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Claims

Abstract

The invention relates to lithium-bearing iron phosphate in the form of micrometric mixed aggregates of nanometric particles, to an electrode and cell resulting therefrom and to the method for manufacturing same, which is characterized by a nanomilling step.

Claims

exact text as granted — not AI-modified
1 - 18 . (canceled) 
     
     
         19 . An electrode based on a composite material of lithiated iron phosphate and of carbon having, at a surface capacity of less than 2 mAh/cm 2 , a practical electrode specific capacity comprised between a 150 and 170 mAh/g, preferably between 155 and 170 mAh/g. 
     
     
         20 . An electrode based on a composite material of lithiated iron phosphate and of carbon having, at a surface capacity comprised between 2 and 4 mAh/cm 2  and preferably of the order of 3 mAh/cm 2 , a practical specific capacity greater than 150 mAh/g and less than 170 mAh/g. 
     
     
         21 . The electrode according to  claim 19 , further comprising one or several electron conducting additives and one or several organic binders. 
     
     
         22 . The electrode according to  claim 21 , wherein said one or several electron conducting additives is selected from the group consisting of carbon fibers, carbon black, carbon nanotubes and the like. 
     
     
         23 . The electrode according to  claim 19 , wherein said electrode material is present in an amount ranging from 80 to 92% by weight, based on the total weight of the electrode. 
     
     
         24 . The electrode according to  claim 21 , wherein said one or several electronic conducting additives is present in an amount ranging from 4 to 14% by weight, based on the total weight of the electrode. 
     
     
         25 . The electrode according to  claim 21 , wherein said one or several organic binders is present in an amount ranging from 4 to 10% by weight, based on the total weight of the electrode. 
     
     
         26 . The electrode according to  claim 19 , having a porosity comprised between 50 and 25%. 
     
     
         27 . A Li-ion electrochemical cell comprising an electrode according to  claim 19 . 
     
     
         28 . The electrochemical cell according to  claim 27 , further comprising a negative carbon electrode and a Li +  ion conducting electrolyte. 
     
     
         29 . The electrochemical cell according to  claim 27 , having a mass energy density comprised between 160 and 180 Wh/kg. 
     
     
         30 . An electrode material having the following formulae Li α Fe β B γ PO 4 /C, wherein 0.85≦α≦1.08, 0≦γ/βα≦0.1 and γ+β≦1, wherein it appears as micrometric mixed welded assembly of nanometric particles, said nonmetric particles having a maximum size, as measured by transmission microscopy, of less than 50 nm, and said micrometric welded assembly having an average size (D50) as measured by laser grain size measurement in methanol comprised between 0.50 and 60 μm, preferably between 1 and 45 μm, and more preferentially from 2 to 15 μm. 
     
     
         31 . The electrode material according to  claim 30 , having the following formula LiFe β B γ PO 4 /C, wherein γ+β<1, in particular LiFe 0.95 B 0.033 PO 4 /C. 
     
     
         32 . The electrode material according to  claim 30 , wherein the residual carbon content is strictly comprised between 1 and 3% by weight, based on the weight of said electrode material. 
     
     
         33 . The electrode material according to  claim 30 , wherein the tapped density has a value between 0.8 and 1.5 and is preferably about 1.1 g/cm 3 . 
     
     
         34 . The electrode material according to  claim 30 , wherein the specific surface area, as measured according to the BET method has a value from 12 to 24 m 2 /g, preferably from 16 to 22 m 2 /g, in particular from 18 to 20 m 2 /g. 
     
     
         35 . The electrode material according to  claim 30 , wherein the average size of the particles, D50, as measured by laser grain size measurement in methanol, is comprised between 3 and 8 μm. 
     
     
         36 . An electrode based on a composite material of lithiated iron phosphate and of carbon having, at a surface capacity of less than 2 mAh/cm 2 , a practical electrode specific capacity comprised between a 150 and 170 mAh/g, preferably between 155 and 170 mAh/g. 
     
     
         37 . An electrode based on a composite material of lithiated iron phosphate and of carbon having, at a surface capacity comprised between 2 and 4 mAh/cm 2  and preferably of the order of 3 mAh/cm 2 , a practical specific capacity greater than 150 mAh/g and less than 170 mAh/g. 
     
     
         38 . An electrode comprising said electrode material according to  claim 30 . 
     
     
         39 . The electrode according to  claim 36 , further comprising one or several electron conducting additives and one or several organic binders. 
     
     
         40 . The electrode according to  claim 39 , wherein said one or several electron conducting additives is selected from the group consisting of carbon fibers, carbon black, carbon nanotubes and the like. 
     
     
         41 . The electrode according to  claim 36 , wherein said electrode material is present in an amount ranging from 80 to 92% by weight, based on the total weight of the electrode. 
     
     
         42 . The electrode according to  claim 38 , wherein said one or several electronic conducting additives is present in an amount ranging from 4 to 14% by weight, based on the total weight of the electrode. 
     
     
         43 . The electrode according to  claim 38 , wherein said one or several organic binders is present in an amount ranging from 4 to 10% by weight, based on the total weight of the electrode. 
     
     
         44 . The electrode according to  claim 36 , having a porosity comprised between 50 and 25%. 
     
     
         45 . A Li-ion electrochemical cell comprising an electrode according to  claim 36 . 
     
     
         46 . The electrochemical cell according to  claim 45 , further comprising a negative carbon electrode and a Li +  ion conducting electrolyte. 
     
     
         47 . The electrochemical cell according to  claim 45 , having a mass energy density comprised between 160 and 180 Wh/kg.

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