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A kind of negative electrode material of lithium ion battery and its preparation method and application

A lithium-ion battery and negative electrode material technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve the effect of improving rate performance, large capacity, and increasing capacity and charge-discharge rate

Active Publication Date: 2017-04-12
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, large-scale production of lithium titanate / reduced graphene oxide composites is still a challenge

Method used

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  • A kind of negative electrode material of lithium ion battery and its preparation method and application
  • A kind of negative electrode material of lithium ion battery and its preparation method and application
  • A kind of negative electrode material of lithium ion battery and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 Lithium-ion battery negative electrode material

[0019] (1) Preparation method

[0020] Dissolve 65-70mL of concentrated H 2 S0 4 Place in an ice-water bath, add 1.9-2.2g of graphite and 1.5-1.7g of NaNO under stirring at 100-240r / min 3 , after stirring evenly, add 8 ~ 10g KMnO 4 , reacted for 15 to 30 minutes, and added H after the reaction 2 o 2 Until the solution turns bright yellow, centrifuge and wash to obtain graphene oxide (GO).

[0021] 3.15g TiOSO 4 2H 2 O was dissolved in 40ml deionized water to obtain TiOSO 4 solution, take 30ml TiOSO 4 After the solution was mixed with 0.02050g of GO, it was added to 70ml of ethylene glycol, ultrasonically treated for 20min, then added to 90ml of aqueous solution containing 2.02g of LiOH and 0.6g of urea, added 0.6g of glucose, and stirred for 3min to obtain a mixed solution. Put the mixed solution into the reaction kettle, react at 180°C for 24h, filter, take the precipitate, wash, dry at 80°C for 24h,...

Embodiment 2

[0025] Example 2 Lithium-ion battery negative electrode material

[0026] (1) Preparation method

[0027] 3.15g TiOSO 4 2H 2 O was dissolved in 40ml deionized water to obtain TiOSO 4 solution, take 30ml TiOSO 4 After the solution was mixed with 0.02055g of GO, it was added to 70ml of ethylene glycol, ultrasonically treated for 20min, then added to 90ml of aqueous solution containing 2.02g of LiOH and 0.6g of urea, added 0.6g of glucose, and stirred for 3min to obtain a mixed solution. Put the mixed solution into the reaction kettle, react at 180°C for 24h, filter, take the precipitate, wash, dry at 80°C for 24h, and calcine it under N 2 Under the atmosphere, calcining at 500° C. for 2 hours, then heating up to 700° C. and calcining for 10 hours, to obtain the lithium ion battery negative electrode material. The negative electrode material of lithium ion battery is a composite of lithium titanate and reduced graphene oxide.

[0028] The obtained composite of lithium titanat...

Embodiment 3

[0029] Example 3 Lithium ion battery negative electrode material

[0030] (1) Preparation method

[0031] 3.15g TiOSO 4 2H 2 O was dissolved in 40ml deionized water to obtain TiOSO 4 solution, take 30ml TiOSO 4 After the solution was mixed with 0.02060g of GO, it was added to 70ml of ethylene glycol, ultrasonically treated for 20min, then added to 90ml of aqueous solution containing 2.02g of LiOH and 0.6g of urea, added 0.6g of glucose, and stirred for 3min to obtain a mixed solution. Put the mixed solution into the reaction kettle, react at 180°C for 24h, filter, take the precipitate, wash, dry at 80°C for 24h, and calcine it under N 2 Under the atmosphere, calcining at 500° C. for 2 hours, then heating up to 700° C. and calcining for 10 hours, to obtain the lithium ion battery negative electrode material. The negative electrode material of lithium ion battery is a composite of lithium titanate and reduced graphene oxide.

[0032] The obtained composite of lithium titan...

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Abstract

The invention relates to a negative electrode material for a lithium ion battery, as well as a preparation method and application of the negative electrode material. According to the technical scheme, the preparation method of the negative electrode material for the lithium ion battery is adopted to synthesize a compound which mainly comprises flake lithium titanate / reduced graphene oxide by a simple method, and particularly comprises the following steps: adding graphene oxide into a titanyl sulfate solution; adding ethylene glycol, glucose, lithium hydroxide and urea into the solution; and reacting in a reaction kettle to finally prepare the compound. According to the negative electrode material for the lithium ionic battery, the excellent performance of lithium titanate and graphene oxide serving as negative electrode materials can be sufficiently inherited, faradaic pseudocapacitance effect of flake lithium titanate is increased, the capacity and the charge-discharge speed of the battery can be further improved, the high requirement on batteries caused by modern society is met, popularization and application of the negative electrode material of lithium ionic batteries on industrial production can be favored, and practicality and commercialization of the negative electrode materials can be realized.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an improvement and a preparation method of a lithium ion battery negative electrode material formula. Background technique [0002] Lithium-ion batteries have been one of the most important and much-focused energy storage devices. Common applications for lithium-ion batteries have been focused on portable devices. The importance of rechargeable batteries is even more prominent in various types of electric vehicles or energy storage systems. However, commercial lithium-ion batteries still cannot meet the needs of those large power sources and encounter issues such as safety and long-term stability that must be overcome. Although graphite is the most commonly used as the anode material, it exhibits serious safety issues due to the dendrite growth of Li due to the low operating voltage. Spinel lithium titanate is one of the most promising alternative anode materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/485
CPCY02E60/10
Inventor 葛昊郝婷婷陈丽田辉宋赢宋溪明
Owner LIAONING UNIVERSITY
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