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

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complex synthesis process and poor rate performance, and achieve simple synthesis process, good rate discharge performance, and environmental friendliness

Inactive Publication Date: 2011-10-05
HARBIN INST OF TECH
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  • 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 complex synthesis process; however, xLiFePO, the positive electrode material for lithium-ion batteries, is provided 4 ·yLi 3 V 2 (PO 4 ) 3 preparation method

Method used

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

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specific Embodiment approach 1

[0011] Specific implementation mode 1: In this implementation mode, the positive electrode material of lithium ion battery xLiFePO 4 ·yLi 3 V 2 (PO 4 ) 3 The preparation method is carried out according to the following steps: one, according to the molar ratio of Li element, Fe element, V element, P element and C element is (x+3y)~1.1(x+3y): x: 2y: (x +3y): 0.5(x+2y)~2(x+2y) ratio Weigh lithium source, iron source, vanadium salt, phosphoric acid source and carbon source and mix to obtain a mixture, then put the mixture in a ball mill, add dispersant After wet milling for 2 to 12 hours, the mixture is obtained, wherein the volume ratio of the dispersant to the mixture is 1 to 10:1, the dispersant is absolute ethanol, acetone or water, and 0.05≤x / (x+y)≤0.95 ; 2. Under the protection of 250-450 ℃ and protective gas, pre-sinter the mixture obtained in step 1 for 2-6 hours; 3. Then pre-sinter the mixture obtained in step 2 at 570-870 ℃ and under the protection of protective gas ...

specific Embodiment approach 2

[0013] 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.

[0014] In this embodiment, when the lithium source is a mixture, various lithium sources are mixed in any ratio.

specific Embodiment approach 3

[0015] 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, ferric phosphate hydrate, 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 lithium ion battery anode material xLiFePO4.yLi3V2(PO4)3, and relates to a method for preparing a lithium ion battery anode material. The method solves the technical problems of poor magnification performance and complex synthesis process in the conventional method for synthesizing the xLiFePO4.yLi3V2(PO4)3. The method comprises the following steps of: weighing lithium source, iron source, vanadium salt, phosphate and carbon source, mixing, and performing wet milling, pre-sintering and calcination to obtain the xLiFePO4.yLi3V2(PO4)3. The process is simple, and environmental pollution easily caused in a liquid phase method is not caused. 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] Because 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. He 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 a liquid-phase synthesis method for this material, but the liquid-phase preparation meth...

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 戴长松陈振宇刘正胡信国
Owner HARBIN INST OF TECH
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