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High-voltage positive electrode material used by lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as low discharge capacity, improve electrical conductivity, reduce material costs, improve discharge capacity and cycle performance Effect

Inactive Publication Date: 2010-07-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Electrochemistry Communications magazine 2009 No. 11, page 137, reported iron-doped lithium cobalt phosphate cathode material (LiCo 1-x Fe x PO 4 / C), when x=0.05, the first discharge capacity of the material is 120mAh.g under the condition of 0.05C discharge rate -1 , than undoped LiCoPO 4 / C discharge capacity (108mAh.g -1 ) higher than 12mAh.g -1 , but the discharge capacity of the material is still low

Method used

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  • High-voltage positive electrode material used by lithium ion battery and preparation method thereof
  • High-voltage positive electrode material used by lithium ion battery and preparation method thereof
  • High-voltage positive electrode material used by lithium ion battery and preparation method thereof

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Experimental program
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Embodiment 1

[0025] Mix 0.5542 g lithium carbonate (0.015 moles Li), 3.4628 g cobalt acetate (0.0139 moles Co), 0.0665 g vanadium pentoxide (0.00073 moles V), 1.7255 g ammonium dihydrogen phosphate (0.015 moles P), and 0.1263 g acetylene black , add 4.5g of absolute ethanol at the same time, ball mill in a ball mill for 5 hours, the speed of the ball mill is 250 rpm, dry at 80°C after ball milling, then pre-burn at 350°C under the protection of argon gas for 6 hours, after natural cooling Grinding for 10 minutes, pressing into tablets under a pressure of 15 MPa, roasting at 750° C. under the protection of argon gas for 16 hours, cooling and grinding to obtain a high-voltage positive electrode material for lithium-ion batteries. The resulting material consists of Li 1.025 co 0.95 V 0.05 (PO 4 ) 1.025 / C; carbon element analysis shows that the carbon content in the material is 4.96wt%.

[0026] figure 1 A kind of lithium-ion battery high-voltage cathode material Li that obtains for emb...

Embodiment 2

[0029] Mix 2.0404 g lithium acetate (0.02 moles Li), 1.3158 g cobaltous oxide (0.0171 moles Co), 0.2228 g ammonium metavanadate (0.0019 moles V), 2.3006 g diammonium hydrogen phosphate (0.02 moles P), and 0.6183 g glucose , add 8.2g of absolute ethanol at the same time, ball mill in a ball mill for 4 hours, the speed of the ball mill is 300 rpm, dry at 80°C after ball milling, then pre-burn for 5 hours under the protection of nitrogen gas at 300°C, and grind after natural cooling 15 minutes, press under the pressure of 20MPa, bake at 750 DEG C under the protection of nitrogen gas for 16 hours, cool and grind naturally to obtain a high-voltage positive electrode material for lithium-ion batteries. The resulting material consists of Li 1.05 co 0.9 V 0.1 (PO 4 ) 1.05 / C; carbon element analysis shows that the carbon content in the material is 6.01wt%.

[0030] image 3 A kind of lithium ion battery high-voltage cathode material Li that obtains for embodiment 1 and embodimen...

Embodiment 3

[0033] 1.1084 g lithium carbonate (0.03 moles Li), 6.2856 g cobalt oxalate (0.0287 moles Co), 0.0807 g vanadium pentoxide (0.00089 moles V), 3.4509 g ammonium dihydrogen phosphate (0.03 moles P) and 0.2497 g conductive carbon black , add 5.6g of absolute ethanol at the same time, ball mill in a ball mill for 8 hours, the speed of the ball mill is 220 rpm, dry at 80°C after ball milling, then pre-burn at 350°C under the protection of argon gas for 5 hours, after natural cooling Grinding for 10 minutes, pressing into tablets under a pressure of 15 MPa, calcining for 10 hours at 800° C. under the protection of argon gas, cooling and grinding naturally to obtain a high-voltage positive electrode material for lithium-ion batteries. The resulting material consists of Li 1.015 co 0.97 V 0.03 (PO 4 ) 1.015 / C; carbon element analysis shows that the carbon content in the material is 5.09wt%. The initial discharge capacity of the material can reach 120.8mAh.g -1 .

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Abstract

The invention discloses a high-voltage positive electrode material used by a lithium ion battery and a preparation method thereof. Vanadium is used for replacing parts of cobalt in the cobaltous lithium phosphate for carbon cladding. The high-voltage positive electrode material has the composition of Li<1+0.5x>CO<1-x>Vx(PO4)<1+0.5x> / C, wherein x is larger than or equal to 0.01 and is smaller than or equal to 0.11, and the carbon content is between 1 and 8 weight percent. The method comprises the following steps: sufficiently mixing lithium source compounds, cobalt source compounds, vanadium source compounds, phosphorus source compounds and carbon source compounds through ball milling; preburning the materials at 300 to 350 DEG C after being dried; and then, roasting the materials at 700 to 850 DEG C to obtain a black powdery Li<1+0.5x>CO<1-x>Vx(PO4)<1+0.5x> / C high-voltage positive electrode material. The positive electrode material is assembled into button cell batteries to be tested, the stable discharge platform reaches 4.8 V(vs.Li / Li<+>) under the condition of 0.1 C discharging multiplying power, wherein the Li<1.025>Co<0.95>V<0.05>(PO4)<1.025> / C positive electrode material has the first time discharge capacitance of 134.8 mAh*g<-1>, the reversible capacitance after 25 times of circulation is 114.6 mAh*g<-1> and the capacitance maintenance rate is 85 percent.

Description

technical field [0001] The invention relates to a battery electrode material and a preparation method thereof, in particular to a high-voltage cathode material for a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in notebook computers, mobile communication devices, and various portable electric tools since they came out in the 1990s due to their many advantages such as high energy density, long cycle life, and low self-discharge rate. In order to solve the current increasingly serious energy crisis and environmental pollution problems, lithium-ion power batteries used in electric vehicles and hybrid vehicles have become the focus of competing development in various countries. However, most of the currently widely used cathode materials for lithium-ion batteries (such as lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate) have a discharge platform of 4V (vs. Li / Li + ) belo...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/12Y02E60/10
Inventor 杨军王飞努丽燕娜王久林
Owner SHANGHAI JIAO TONG UNIV
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