Microcrystal LiVOPO4-LiMPO4-TiO2 composite lithium battery material and preparation method thereof

A technology of composite lithium and electrical materials, applied in the direction of batteries, circuits, electrical components, etc., can solve the problems of low electronic conductivity of glass-ceramic, unsatisfactory cycle performance, and slow diffusion coefficient of lithium ions, so as to improve the rate performance and cycle performance, improving low-temperature rate performance and cycle life, and avoiding side reactions

Active Publication Date: 2017-06-20
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the invention is to solve LiVOPO 4 Glass-ceramic used as a cathode material in the technical bottleneck of lithium-ion batteries - "LiVOPO 4 The low electronic conductivity of glass-ceramics and the slow diffusion coefficient of lithium ions in it lead to unsatisfactory cycle performance", in order to provide a LiVOPO 4 Glass-ceramic as the main raw material, lithium battery cathode material with ideal cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) 71 copies of LiVOPO 4 Glass-ceramic, 20 parts LiMPO 4 and 9 parts nano-TiO 2 Put it into a conical ribbon mixer, mix the materials for 0.5h, and mix evenly to obtain a mixture; the mixture is pre-sintered in an air atmosphere at 200°C for 2h to form a precursor; the precursor is calcined in an air atmosphere at 400°C for 1h to obtain LiVOPO 4 Glass-ceramic-LiMPO 4 -nano-TiO 2 Composite lithium battery material.

[0021] (2) The resulting sample (i.e. the LiVOPO prepared in step 1 4 Glass-ceramic-LiMPO 4 -nano-TiO 2 The electrochemical performance of the composite lithium battery material) was measured as follows: 95 parts of samples, 3 parts of carbon black SP, 2 parts of graphite KS-15 and 5 parts of polyvinylidene fluoride (PVDF) were dissolved in the solvent N-methylpyrrolidone (NMP) to form a slurry, and evenly coat the slurry on the aluminum foil to form an electrode sheet with a coating thickness of about 110 μm. Cut the electrode sheet to an area of ​...

Embodiment 2

[0023] (1) Mix 80 copies of LiVOPO 4 Glass-ceramic, 13 parts LiMPO 4 and 7 nano-TiO 2 Put it into a conical ribbon mixer, mix the materials for 0.7h, and mix evenly to obtain a mixture; the mixture is pre-sintered in an air atmosphere at 300°C for 5h to form a reaction precursor; the precursor is calcined in an air atmosphere at 500°C for 4h to obtain LiVOPO 4 Glass-ceramic-LiMPO 4 -nano-TiO 2 Composite lithium battery cathode material.

[0024] (2) 95 samples (i.e. LiVOPO prepared in step 1 4 Glass-ceramic-LiMPO 4 -nano-TiO 2Composite lithium battery material), 3 parts of carbon black SP, 2 parts of graphite KS-15 and 5 parts of polyvinylidene fluoride (PVDF), made electrode sheets according to Example 1 and assembled into batteries. Charge to 4.2V at a rate of 20mA / g (equivalent to 0.1C in terms of positive electrode), and discharge to 2.75V. The first discharge curve obtains a stable discharge voltage platform of 3.85V. The first reversible specific capacity is abou...

Embodiment 3

[0026] (1) 93 copies of LiVOPO 4 Glass-ceramic, 5 parts LiMPO 4 and 2 parts Nano TiO 2 Put it into a conical ribbon mixer, mix the materials for 1 hour, and mix evenly to obtain a mixture; the mixture is pre-sintered in an air atmosphere at 400°C for 10 hours to form a reaction precursor; the precursor is calcined in an air atmosphere at 600°C for 10 hours to obtain LiVOPO 4 Glass-ceramic-LiMPO 4 -nano-TiO 2 Composite lithium battery cathode material.

[0027] (2) 95 samples (i.e. LiVOPO prepared in step 1 4 Glass-ceramic-LiMPO 4 -nano-TiO 2 Composite lithium battery material), 3 parts of carbon black SP, 2 parts of graphite KS-15 and 5 parts of polyvinylidene fluoride (PVDF), made electrode sheets according to Example 1 and assembled into batteries. Charge to 4.2V at a rate of 20mA / g (equivalent to 0.1C in terms of positive electrode), and discharge to 2.75V. The first discharge curve obtains a stable discharge voltage platform of 3.85V. The first reversible specific c...

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Abstract

The invention discloses a microcrystal LiVOPO4-LiMPO4-TiO2 composite lithium battery material and the preparation method thereof, belonging to the technical field of the preparation of lithium battery materials. According to the invention, the LiVOPO4 glass ceramics (71 to 93% by weight), LiMPO4 (5% to 20%) and nanometer TiO2 (2% to 9%) are used as the raw materials to prepare the LiVOPO4 glass ceramics-LiMPO4-nanometer TiO2 composite lithium battery material by means of the high temperature solid phase synthesis method. According to the invention, through the nano-composite interaction of the materials, the charge transfer impedance can be effectively reduced on the one hand, and the direct contact between the electrolyte solution and the electrode material can be reduced on the other hand, and the side reaction between the electrolyte solution and the electrode material can be avoided, therefore, the rate performance and cycle performance of the material can be remarkably improved. The product of the invention can be used as a cathode material of a lithium ion secondary battery used in a portable electronic device and an electric automobile.

Description

technical field [0001] The invention relates to a microcrystalline LiVOPO 4 -LiMPO 4 -TiO 2 The invention relates to a composite lithium battery material and a preparation method thereof; it belongs to the technical field of lithium battery material preparation. Background technique [0002] LiVOPO 4 The theoretical capacity of glass-ceramics reaches 159mAh / g, the structure is stable, the discharge voltage is equivalent to other positive active materials (3.8-3.9V relative to metal lithium), and the capacity can be fully utilized. At the same time, vanadium is very rich in resources. The output of vanadium in my country ranks third in the world, and the price of vanadium is much lower than that of cobalt. Considering the cost of materials, the research and development of Li-V series cathode materials in my country is more expensive than LiCoO 2 Cathode materials are more practical. LiVOPO 4 These advantages of glass-ceramic make it a LiCoO 2 a potential substitute for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/62H01M4/624H01M4/628H01M10/0525H01M2220/20H01M2220/30Y02E60/10
Inventor 李涛关成善李航张敬捧
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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