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

A lithium-ion battery and negative electrode material technology, which is applied to battery electrodes, circuits, electrical components, etc., to achieve large capacity, excellent electrochemical performance, and improved capacity and charge-discharge rate.

Active Publication Date: 2018-08-14
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 preparation method thereof
  • A kind of negative electrode material of lithium ion battery and preparation method thereof
  • A kind of negative electrode material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 A kind of negative electrode material of lithium ion battery

[0030] The preparation method is as follows

[0031] 1) Mix 65-70mL of concentrated H 2 SO 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) for use.

[0032] 2) Ti(OC 4 h 9 ) 4 The solution and ethanol were first mixed in a molar ratio of 1:50 to form solution A. Lithium acetate was dissolved in deionized water as solution B. Under the condition of vigorous stirring, solution B was slowly added dropwise into solution A according to stoichiometric amount. React at 90°C for 1h. Subsequent drying at 140 °C for 5 h removed the remaining organic matter and water and produced a white precursor.

[0033] 3) Calcining the white prec...

Embodiment 2

[0037] Embodiment 2 A kind of negative electrode material of lithium ion battery

[0038] The preparation method is as follows

[0039] 1) The preparation of graphene oxide (GO) is the same as step 1) in Example 1.

[0040] 2) Ti(OC 4 h 9 ) 4 The solution and ethanol are first mixed with a molar ratio of 1:47, which is solution A. Lithium acetate was dissolved in deionized water as solution B. Under the condition of vigorous stirring, solution B was slowly added dropwise into solution A according to stoichiometric amount. React at 100°C for 1 h. Subsequent drying at 140 °C for 5 h removed the remaining organic matter and water and produced a white precursor.

[0041] 3) Calcining the white precursor in a muffle furnace at a temperature of 700° C. for 8 hours to obtain spherical lithium titanate.

[0042] 4) Dissolve 3.15 g of spherical lithium titanate (LTO) in 35 ml of deionized water, mix it with 0.0200 g of graphene oxide, ultrasonicate for 30 min, then add 0.63 g o...

Embodiment 3

[0044] Embodiment 3 A kind of negative electrode material of lithium ion battery

[0045] The preparation method is as follows:

[0046] 1) The preparation of graphene oxide (GO) is the same as step 1) in Example 1.

[0047] 2) Ti(OC 4 h 9 ) 4 The solution and ethanol are first mixed with a molar ratio of 1:46, which is solution A. Lithium acetate was dissolved in deionized water as solution B. Under the condition of vigorous stirring, solution B was slowly added dropwise into solution A according to stoichiometric amount. React at 90°C for 2h. Subsequent drying at 140 °C for 5 h removed the remaining organic matter and water and produced a white precursor.

[0048] 3) Calcining the white precursor in a muffle furnace at a temperature of 680° C. for 7.5 hours to obtain spherical lithium titanate.

[0049] 4) Dissolve 3.55g of spherical lithium titanate (LTO) in 35ml of deionized water, mix it with 0.0245g of graphene oxide, ultrasonicate for 30min, then add 0.65g of gl...

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Abstract

The invention discloses a lithium ion battery anode material and a preparation method of the lithium ion battery anode material. The lithium ion battery anode material is a compound of lithium titanate and reduced graphene oxide. The specific preparation process comprises following steps of adding graphene oxide in a prepared spherical lithium titanate solution; then adding glucose in the solution as a binder; and simply stirring and mixing to prepare the compound. According to the lithium ion battery anode material, the excellent performances of the spherical lithium titanate and graphene oxide as the anode materials are inherited fully; the electric capacity and the charging and discharging rates of the battery are improved much; the high demand of the modern society to the battery is realized; it is beneficial for the popularization and application of the lithium ion battery anode material in the industrial production; and the practicability and commercialization of the anode material are realized.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an improvement of a lithium ion battery negative electrode material formula and a preparation method thereof. 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 m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/583
CPCH01M4/5825H01M4/583Y02E60/10
Inventor 葛昊郝婷婷田辉陈丽宋溪明
Owner LIAONING UNIVERSITY
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