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Preparation method of lithium ion battery positive electrode material Li3V2(PO4)3

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high synthesis temperature, long calcination time, and complicated sol-gel process.

Inactive Publication Date: 2015-03-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method solves the problems of high synthesis temperature, long calcination time, high cost, flammability and explosion in the spray drying process and complex sol-gel process in the high-temperature solid-phase method and carbothermal reduction method.

Method used

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  • Preparation method of lithium ion battery positive electrode material Li3V2(PO4)3
  • Preparation method of lithium ion battery positive electrode material Li3V2(PO4)3
  • Preparation method of lithium ion battery positive electrode material Li3V2(PO4)3

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specific Embodiment approach 1

[0018] Specific implementation mode 1: In this implementation mode, lithium-ion battery positive electrode material Li 3 V 2 (PO 4 ) 3 Prepared according to the following steps:

[0019] 1. Weigh lithium source, vanadium source, phosphorus source and carbon source materials according to the molar ratio of lithium element, vanadium element, phosphorus element and carbon element in the ratio of 3:2:3:(2.5~3), mix them, and then mix them in adding an aqueous hydrogen peroxide solution with a volume fraction of 30% for ball milling, and then drying to obtain a precursor;

[0020] 2. Put the precursor into a tube furnace, treat it at 300±50°C and an inert atmosphere for 4±0.5h, and then grind it to obtain the intermediate;

[0021] 3. Place the intermediate in an inert atmosphere, sinter at 800±50°C for 6±0.2h, and then cool to room temperature to obtain Li-ion battery anode material Li 3 V 2 (PO 4 ) 3 ;

[0022] Wherein, the ratio of the lithium element material to the aq...

specific Embodiment approach 2

[0026] Embodiment 2: The differences between this embodiment and Embodiment 1 are: the time for ball milling in step 1 is 5-7 hours, and the rotating speed of the ball mill is 100-200 r / min. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0027] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is: the ball-to-material ratio in step 1 is 2:1. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a preparation method of a lithium ion battery positive electrode material Li3V2(PO4)3, and relates to the preparation method of the lithium ion battery positive electrode material. The performance of a lithium ion battery positive electrode is further improved on the basis of the prior art. The preparation method comprises the following steps: 1. weighing materials such as a lithium source, a vanadium source, a phosphorus source and a carbon source and mixing the materials; adding a hydrogen peroxide water solution into the mixed materials and carrying out ball milling; 2. treating; and 3. sintering. The lithium ion battery positive electrode material Li3V2(PO4)3 prepared by the preparation method has uniform crystallized particles, the grain diameter is less than 1 micron and the specific surface area is relatively large. The performance of the lithium ion battery positive electrode is relatively excellent.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] Lithium vanadium phosphate, a cathode material for lithium-ion batteries, has the advantages of high charge-discharge voltage platform, high theoretical specific capacity, stable structure, and good safety performance, which has become a research hotspot in lithium-ion batteries in recent years. Positive electrode materials for development. Li 3 V 2 (PO 4 ) 3 It is a positive electrode material based on phosphate polymeric anion, which can generate a relatively high redox potential and has a relatively stable structure. The lithium ion diffusion channel is large, which is conducive to the intercalation and extraction of lithium ions in lithium vanadium phosphate, and is one of the positive electrode materials for lithium ion batteries with great application potential. [0003] At present, there are many preparatio...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 戴长松闵秀娟马全新刘元龙郑茹娟
Owner HARBIN INST OF TECH
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