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Method for preparing magnesium-doped xLiFePO4.yLi3V2(PO4)3 lithium ion battery anode material

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unfriendly environment and poor rate performance

Active Publication Date: 2011-10-05
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention will solve existing synthetic xLiFePO 4 ·yLi 3 V 2 (PO 4 ) 3 There are technical problems of poor rate performance and unfriendly environment; while providing magnesium-doped xLiFePO 4 ·yLi 3 V 2 (PO 4 ) 3 Preparation method of lithium ion battery cathode material

Method used

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  • Method for preparing magnesium-doped xLiFePO4.yLi3V2(PO4)3 lithium ion battery anode material
  • Method for preparing magnesium-doped xLiFePO4.yLi3V2(PO4)3 lithium ion battery anode material
  • Method for preparing magnesium-doped xLiFePO4.yLi3V2(PO4)3 lithium ion battery anode material

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specific Embodiment approach 1

[0010] Specific implementation mode 1: In this implementation mode, magnesium doped xLiFePO 4 ·yLi 3 V 2 (PO 4 ) 3 The preparation method of lithium-ion battery cathode material is carried out according to the following steps: one, according to the molar ratio of Li element, Fe element, V element, Mg element, P element and C element is (x+3y)~1.1(x+ 3y): x: 2y: 0.1(x+y)~0.5(x+y):(x+3y):0.5(x+3y)~2(x+3y) Weigh lithium source, iron source, vanadium Salt, magnesium salt, phosphoric acid source and carbon source are mixed to obtain a mixture, and then the mixture is placed in a ball mill, and after adding a dispersant, it is wet-milled for 2-12 hours to obtain a mixture, wherein the volume ratio of the dispersant to the mixture is 1- 10:1, the dispersant is absolute ethanol, acetone or water, 0.05≤x / (x+y)≤0.95; 2. Pre-sinter the mixture obtained in step 1 under the protection of 250~450℃ and protective gas 2~6h; 3. Then the pre-sintered mixture is calcined at 570~870℃ and und...

specific Embodiment approach 2

[0012] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the lithium source described in step one is LiOH·H 2 O, LiF, Li 2 CO 3 、LiCH 3 COO·H 2 O and LiNO 3 one or a combination of several of them. Other steps and parameters are the same as in the first embodiment.

[0013] In this embodiment, when the lithium source is a mixture, various lithium sources are mixed in any ratio. Magnesium-doped xLiFePO prepared in this embodiment 4 ·yLi 3 V 2 (PO 4 ) 3 With higher first discharge specific capacity and capacity retention rate, the prepared Mg-doped xLiFePO 4 ·yLi 3 V 2 (PO 4 ) 3 The first discharge specific capacity of the electrode is 130mAh g -1 . After 400 cycles, the capacity retention rate of the former is not less than 95%. And found that this positive electrode has good rate discharge performance, when discharged at 10C, the discharge specific capacity is 90mAh g -1 , the capacity hardly fades after 20 cycle...

specific Embodiment approach 3

[0014] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the iron source in Step 1 is ferrous oxalate, ferric phosphate, hydrated ferric phosphate, ferric nitrate or iron oxide. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a method for preparing a magnesium-doped xLiFePO4.yLi3V2(PO4)3 lithium ion battery anode material, and relates to a method for preparing a lithium ion battery anode material. The method solves the problems of bad existence environment and high cost of prior lithium ion anode materials under the condition that the cycle performance of the lithium ion anode materials is ensured not to reduce. The method comprises the following steps of: weighing lithium source, iron source, vanadium salt, magnesium salt, phosphoric acid source and carbon source, mixing, and performing wet milling, pre-sintering and calcination to obtain the xLiFePO4.yLi3V2(PO4)3. The process is simple. The anode material prepared by the method has good magnification discharge performance; and during 10C discharge, the discharge specific capacity is 90mAh / g, and the capacity is nearly not attenuated after 20 times of cycles.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] Since lithium-ion batteries have the highest energy density among commercial secondary batteries, they are highly valued by many electric vehicle battery research and development units. Since the performance of lithium-ion batteries depends largely on the cathode materials, the research on cathode materials for lithium-ion batteries has become a current research hotspot. [0003] wxya 4 ·yLi 3 V 2 (PO 4 ) 3 It is a new type of cathode material for lithium-ion batteries. It not only has LiFePO 4 The advantage of low cost, but also has the advantages of Li 3 V 2 (PO 4 ) 3 The advantages of the compound can be charged and discharged at a high rate. It is a new material with great potential. Previous studies have reported some liquid-phase synthesis methods for this material, but the liquid-phase preparation me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 戴长松陈振宇袁国辉胡信国
Owner HARBIN INST OF TECH
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