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Method for preparing lithium position sodium-doped oxygen lithium vanadium phosphate anode material of lithium ion battery

A technology for lithium vanadyl phosphate and lithium-ion batteries, which can be used in battery electrodes, circuits, electrical components, etc., can solve the problems of no discovery, achieve good crystallinity, improve the capacity and cycle performance of the matrix, and achieve the effect of uniform composition

Inactive Publication Date: 2010-08-18
XIANGXI AUTONOMOUS PREFECTURE MINERALS & NEW MATERIAL TECHNOLOGICAL INNOVATION SERVICE CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To date, no application of these methods to LiVOPO 4 Patents and reports on cathode materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] According to the ratio of Li:Na:V:P=0.998:0.002:1:1, the analytically pure grade lithium carbonate (Li 2 CO 3 ) 7.374g, analytical grade sodium acetate (CH 3 COONa·3H 2 O) 0.0272g, analytical grade ammonium metavanadate (NH 4 VO 3 ) 11.698g, analytical grade dihydrogen ammonium phosphate (NH 4 H 2 PO 4 ) 11.503g, mixed and added to a nylon ball mill tank, and then 60mL of absolute ethanol, sealed and ball milled on a planetary ball mill using zirconia balls as the ball milling medium for 4 hours to obtain a rheological gel, which was dried at 80°C After 2h, it was ground into fine powder, and then sintered at 600℃ for 8h in an argon atmosphere with a flow rate of 0.5L / min. The nominal composition formula was Li 0.998 Na 0.002 VOPO 4 The cathode material powder.

[0010] The electrochemical performance of the obtained sample is measured according to the following method: a sample with a mass fraction of 80%, 10% acetylene black and 10% polyvinylidene fluoride are mixed and di...

Embodiment 2

[0012] Weigh the analytically pure lithium carbonate (Li: Na: V: P = 0.996: 0.004:1:1). 2 CO 3 ) 7.360g, analytical grade sodium acetate (CH 3 COONa·3H 2 O) 0.0544g, analytical grade ammonium metavanadate (NH 4 VO 3 ) 11.698g, analytical grade dihydrogen ammonium phosphate (NH 4 H 2 PO 4 ) 11.503g, mixed and added to the corundum ball mill jar, and then 60mL of acetone, sealed and then ball milled on a planetary ball mill with agate balls as the ball milling medium for 6 hours to obtain a rheological gel. The gel was dried at 80°C for 2 hours and then ground Into fine powder, and then sintered at 600℃ for 8h in an argon atmosphere with a flow rate of 1.0 liter / min. The nominal composition formula is Li 0.996 Na 0.004 VOPO 4 The cathode material powder.

[0013] The electrochemical performance of the obtained sample was measured according to the following method: a sample with a mass fraction of 80%, 10% acetylene black and 10% polyvinylidene fluoride were mixed, and electrode sheet...

Embodiment 3

[0015] According to the ratio of Li:Na:V:P=0.994:0.006:1:1, the analytically pure lithium carbonate (Li 2 CO 3 ) 7.345g, analytical grade sodium acetate (CH 3 COONa·3H 2 O) 0.0816g, analytical grade ammonium metavanadate (NH 4 VO 3 ) 11.698g, analytical grade dihydrogen ammonium phosphate (NH 4 H 2 POx) 11.503g, mixed and added to the corundum ball mill tank, and then 60mL deionized water, sealed and ball milled on a planetary ball mill using stainless steel balls as the ball milling medium for 4 hours to obtain a rheological gel, which was dried at 80°C After 2h, it was ground into fine powder, and then sintered at 600℃ for 10h in an argon atmosphere with a flow rate of 1.0L / min. The nominal composition formula was Li 0.994 Na 0.006 VOPO 4 The cathode material powder.

[0016] The electrochemical performance of the obtained sample was measured according to the following method: a sample with a mass fraction of 80%, 10% acetylene black and 10% polyvinylidene fluoride were mixed, an...

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Abstract

The invention discloses a method for preparing a lithium position sodium-doped oxygen lithium vanadium phosphate anode material of a lithium ion battery. The nominal constitution formula of the anode material is Li1-xNaxVOPO4 and the doping amount is in a range that x is more than 0 and less than 0.05. The method comprises the following steps of: mixing lithium sources, sodium sources, vanadium sources and phosphorus sources in a certain proportion; adding dispersants into the mixture to perform mixing and ball milling for 4 to 6 hours to obtain rheological jelly; drying the jelly at the temperature of 60 to 80 DEG C for 2 hours and grinding the dried jelly into powder; and sintering the jelly powder in a certain atmosphere at the temperature of 400 to 800 DEG C for 6 to 10 hours to obtain lithium position sodium-doped oxygen lithium vanadium phosphate powder of which the nominal constitution formula is Li1-xNaxVOPO4( x is more than 0 and less than 0.5). In the method, the anode material lithium position sodium-doped oxygen lithium vanadium phosphate powder which is used for secondary Lithium-Ion batteries and doped with the sodium at lithium position and has high crystallinity and uniform content is prepared by simple mixing, ball milling and drying processes, controlling thermal treatment temperature and time, and a rheological phase method suitable for commercial production; and the initial discharge capacity at room temperature is more than 140mAh / g. Compared with pure oxygen lithium vanadium phosphate, the oxygen lithium vanadium phosphate of the invention obviously improves matrix capacities and cycle performance, particularly high-rate cycle performance. The synthesis process of the material is suitable for industrialized production.

Description

Technical field [0001] The invention relates to a preparation method of a lithium ion battery lithium site sodium doped lithium vanadyl phosphate cathode material. Background technique [0002] The rapid development of IT industry, mobile communications, electronic equipment and electric vehicles has put forward new requirements for cathode materials for lithium-ion batteries. Among many cathode materials, lithium cobalt oxide (LiCoO 2 ) Excellent performance, but scarce cobalt resources, high price of lithium cobalt oxygen and poor safety performance limit its application in the field of electric vehicles. Although other layered oxides can also obtain a specific capacity as high as 150mAh / g (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 ), but the thermal stability in the deep charging state is low, and the safety performance such as overcharge stability is lacking. Spinel structure compound LiMn 2 O 4 The theoretical capacity is as high as 148mAh / g, the structure is stable, and the safet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/58
CPCY02E60/122Y02E60/10
Inventor 何则强吴显明陈上刘建本麻明友陈良钢陈善文
Owner XIANGXI AUTONOMOUS PREFECTURE MINERALS & NEW MATERIAL TECHNOLOGICAL INNOVATION SERVICE CENT
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