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Composite anode material LiMnPO4-Li3V2(PO4)3/C for lithium ion battery and preparation method of material

A composite positive electrode material and lithium-ion battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of aggravated electrolyte decomposition, battery cost increase, capacity attenuation, etc., to achieve improved electronic conductivity, low material cost, The effect of structural stability

Active Publication Date: 2013-03-27
新乡市中天新能源科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Li 3 V 2 (PO 4 ) 3 To realize the reversible de / intercalation of three lithiums, it needs to be charged to 4.8V, which will intensify the decomposition of the electrolyte, resulting in serious capacity attenuation
At the same time, the price of vanadium is relatively high. If it is used as anode material for power batteries on a large scale, it will inevitably cause a sharp increase in battery costs.

Method used

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  • Composite anode material LiMnPO4-Li3V2(PO4)3/C for lithium ion battery and preparation method of material
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  • Composite anode material LiMnPO4-Li3V2(PO4)3/C for lithium ion battery and preparation method of material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve 0.154mol lithium nitrate, 0.112mol manganese nitrate, 0.154mol phosphoric acid, and 0.014mol vanadium pentoxide in deionized water and stir to form a blue transparent solution. Then the solution was spray-dried in a spray dryer, the inlet temperature was 200°C, the carrier gas pressure was 0.4Mpa, and the feed flow rate was 20mL.min -1 . The precursor powder collected by the cyclone was put into a tube furnace and heat-treated at 300 °C for 1 h in air. The heat-treated product was mixed with 15% sucrose and milled in a ball mill for 6 hours at a rotational speed of 350r.min -1 . The ball-milled slurry was dried at 85 °C and then pre-fired at 350 °C for 4 h in an argon atmosphere, then calcined at 800 °C for 6 h, and then naturally cooled to obtain a composite cathode material 8LiMnPO 4 -Li 3 V 2 (PO 4 ) 3 / C. During the charge-discharge test at 0.1C and 25℃, the discharge specific capacity of the material reaches 135mAh.g -1 , the capacity retention ra...

Embodiment 2

[0032] Dissolve 0.14mol lithium acetate, 0.08mol manganese acetate, 0.14mol phosphoric acid, and 0.04mol ammonium metavanadate in deionized water and stir to form a blue transparent solution. Then the solution was spray-dried in a spray dryer, the inlet temperature was 220°C, the carrier gas pressure was 0.3Mpa, and the feed flow rate was 25mL.min -1 . The precursor powder collected by the cyclone was put into a tube furnace and heat-treated at 350 °C for 4 h in air. The heat-treated product was mixed with 4% acetylene black and 5% sucrose, and ball milled in a ball mill for 2 hours, and the speed of the ball mill was 400r.min -1 . The ball-milled slurry was dried at 100 °C and then pre-fired at 400 °C for 2 h in an argon atmosphere, then calcined at 600 °C for 12 h, and naturally cooled to obtain a composite cathode material 4LiMnPO 4 -Li 3 V 2 (PO 4 ) 3 / C. The particle size of the composite material is about 100-250 nm.

[0033] figure 2 For the lithium ion batte...

Embodiment 3

[0035] Dissolve 0.15mol lithium nitrate, 0.06mol manganese nitrate, 0.15mol phosphoric acid, and 0.03mol vanadium pentoxide in deionized water and stir to form a blue transparent solution. Then the solution was spray-dried in a spray dryer, the inlet temperature was 210°C, the carrier gas pressure was 0.6Mpa, and the feed flow rate was 80mL.min -1 . The precursor powder collected by the cyclone was put into a tube furnace and heat-treated at 400 °C for 2 h in air. The heat-treated product was mixed with 3% acetylene black and 5% glucose, and ball milled in a ball mill for 8 hours at a speed of 200 r.min -1 . The ball-milled slurry was dried at 70 °C and then pre-fired at 300 °C for 4 h in an argon atmosphere, then calcined at 750 °C for 8 h, and then naturally cooled to obtain a composite cathode material 2LiMnPO 4 -Li 3 V 2 (PO 4 ) 3 / C. The particle size of the composite material is about 100-350 nm.

[0036] image 3 For the lithium ion battery composite positive ...

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Abstract

The invention relates to a composite anode material LiMnPO4-Li3V2(PO4)3 / C for a lithium ion battery and a preparation method of the material. LiMnPO4 and Li3V2(PO4)3 in the LiMnPO4-Li3V2(PO4)3 / C are stoichiometric compounds; a substance amount ratio of the LiMnPO4 to the Li3V2(PO4)3 is equal to 1 / x, wherein x is more than 0 and is less than or equal to 1; and the carbon content in the compound is 1wt%-8wt%. The preparation method of the composite anode material comprises the following steps of: dissolving a lithium source compound, a manganese source compound, a vanadium source compound and a phosphorus source compound in de-ionized water according to a mol ratio of Li to Mn to V to P of (1+3x) to 1 to 2x to (1+3x), thus obtaining a solution, wherein x is more than 0 and is less than or equal to 1; secondly, carrying out spray drying on the solution to obtain precursor powder; heating the precursor powder in a tube furnace; mixing products after heat treatment with a carbon source matter, carrying out ball milling on the mixture to obtain slurry, and then drying the slurry; pre-sintering the slurry in inert atmosphere, and then roasting and cooling the slurry to obtain the composite material LiMnPO4-Li3V2(PO4)3 / C. The composite anode material for the lithium ion battery prepared by the method has high capacity and good rate capability, and is applicable to a power battery.

Description

technical field [0001] The invention relates to a lithium ion battery composite positive electrode material, in particular to a lithium ion battery composite positive electrode material LiMnPO 4 -Li 3 V 2 (PO 4 ) 3 / C and its preparation method. Background technique [0002] Lithium-ion battery, as a kind of mobile power source, has been widely used in various portable electronic devices since the first industrialization by Sony Corporation of Japan in 1991, and has also begun to be practical in some high-power batteries such as electric vehicles. For lithium-ion batteries, the cathode material is a key factor in determining its electrochemical performance, safety performance, and price. At present, the layered structure LiCoO widely used in the lithium-ion battery market 2 、LiNi 1-x-y co x mn y o 2 and spinel-structured LiMn 2 o 4 Poor thermodynamic stability is common in metal oxide cathode materials, and the charging and discharging process is easy to cause pr...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 杨军王飞雷智鸿王久林努丽燕娜
Owner 新乡市中天新能源科技股份有限公司
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