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Composite negative pole material for lithium-ion battery and manufacturing method of negative pole material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as SnO, and achieve the effects of enhancing conductivity, suppressing volume expansion effect, and improving surface utilization.

Active Publication Date: 2013-08-14
CHANGSHU WEIYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the graphene loaded nano-SnO in the prior art 2 As a negative electrode material for lithium-ion batteries, SnO 2 It is easy to fall off from the graphene nanosheet, which leads to the deterioration of the cycle performance of the material, and provides a lithium-ion battery composite negative electrode material and a preparation method thereof

Method used

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  • Composite negative pole material for lithium-ion battery and manufacturing method of negative pole material
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  • Composite negative pole material for lithium-ion battery and manufacturing method of negative pole material

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Effect test

Embodiment 1

[0030] Graphite oxide (GO) was prepared by the Hummers method. Tin chloride pentahydrate (SnCl 4 ·5H 2 O) ultrasonically dissolve in deionized water equivalent to 280 times its mass, adjust the pH to 10 with 1% ammonia water, then ultrasonically disperse GO in deionized water equivalent to 20,000 times its mass, adjust the pH with 1% ammonia water to 10, then SnCl 4 : GO = 7.2: 1 mass ratio Mix the two, transfer to a high-pressure hydrothermal kettle, 160 ° C hydrothermal reaction for 24 hours, after cooling, suction filtration, and water washing, ultrasonically disperse in deionized water equivalent to 3500 times its mass. Add 20% ethanol solution of phenolic resin (molecular weight about 200), phenolic resin and SnCl 4 The mass ratio of the mixture is 0.92:1. After stirring for 20 minutes, it is transferred to a high-pressure hydrothermal kettle, subjected to a hydrothermal reaction at 160°C for 10 hours, cooled, filtered with suction, washed with water, dried in vacuum, ...

Embodiment 2

[0033] SnCl 4 ·5H 2 O was ultrasonically dissolved in deionized water equivalent to 280 times its mass, and the pH was adjusted to 9 with 1% ammonia water, and then GO was ultrasonically dispersed in deionized water equivalent to 20,000 times its mass, and the pH was adjusted to 9 with 1% ammonia water. 9, followed by SnCl 4 : GO = 4.3: 1 mass ratio, mix the two, transfer to a high-pressure hydrothermal kettle, 120 ℃ hydrothermal reaction for 24 hours, after cooling, suction filtration, and water washing, ultrasonically disperse it in a deionized solution equivalent to 3500 times its mass water, add glucose, glucose and SnCl 4 The mass ratio is 4.6:1, stirred for 20 minutes, transferred to a high-pressure hydrothermal kettle, hydrothermally reacted at 120°C for 10 hours, cooled, filtered with suction, washed with water, dried in vacuum, ground and pulverized. Under high-purity nitrogen, the obtained sample was sintered at 400 ° C for 5 h, and cooled to room temperature to o...

Embodiment 3

[0035] SnCl 4 ·5H 2 O was ultrasonically dissolved in deionized water equivalent to 280 times its mass, and the pH was adjusted to 10 with 1% ammonia water, and then GO was ultrasonically dispersed in deionized water equivalent to 20,000 times its mass, and the pH was adjusted to 10, then with SnCl 4 : GO = 5.3: 1 mass ratio, mix the two, transfer to a high-pressure hydrothermal kettle, 140 ℃ hydrothermal reaction for 24 hours, after cooling, suction filtration, and water washing, ultrasonically disperse it in a deionized solution equivalent to 3500 times its mass In water, add 20% ethanol solution of phenolic resin (molecular weight about 200), phenolic resin and SnCl 4 The mass ratio is 0.92:1, stirred for 20 minutes, transferred to a high-pressure hydrothermal kettle, hydrothermally reacted at 140°C for 10 hours, cooled, filtered with suction, washed with water, dried in vacuum, ground and pulverized. Under high-purity nitrogen, the obtained sample was sintered at 500 ° ...

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Abstract

The invention provides a composite negative pole material for a lithium-ion battery and a manufacturing method of the negative pole material, aiming at overcoming the defect in the prior art that cycle performance of the material deteriorates caused by the factor that tin oxide falls off easily after charge-discharge cycles since graphene-loaded nano-tin oxide is used as the negative pole material for the lithium-ion battery. According to the invention, tin oxide-graphene-mesoporous carbon ternary composite material is used as the negative pole material. The manufacturing method comprises the following steps of: (1), carrying out ultrasonic dispersion on graphite oxide into deionized water, and adjusting the pH to be 9-10 by ammonia water; (2) dissolving pentahydrate stannic chloride into water, and adjusting the pH to be 9-10 by the ammonia water; (3) mixing the two solutions and transferring the solutions to a hydrothermal reaction kettle for hydrothermal reaction; (4) carrying out suction filtration and washing on obtained precipitate, carrying out ultrasonic dispersion on the obtained precipitate into a solvent, adding a mesoporous carbon precursor and stirring for hydrothermal reaction; and (5) carrying out suction filtration, washing, vacuum drying, sintering and smashing on the obtained precipitate so as to obtain the tin oxide-graphene-mesoporous carbon ternary composite material.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a lithium ion battery negative electrode material. Background technique [0002] Due to its high specific energy, high voltage, long life, no memory effect, and small self-discharge, lithium-ion batteries have been widely used in mobile communication equipment, portable electronic equipment, and electric vehicles, and have become an important modern and future One of the new energy sources. At present, the commercialized lithium-ion anode materials are mainly carbon materials, and the capacity is generally low, and when carbon materials are used as anodes to intercalate lithium, their electrode potential is similar to that of metal lithium. When the battery is overcharged, lithium is easy to precipitate on the carbon surface, forming dendrites and causing a short circuit, which seriously affects the safety of the battery. Therefore, it is urgent to develop other alternative...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/36H01M4/13
CPCY02E60/122Y02E60/10
Inventor 曹剑瑜王进许娟展亮亮陈智栋
Owner CHANGSHU WEIYI TECH
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