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Preparation method and application of SnO2-TiO2@rGO lithium ion battery negative electrode material

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve problems such as poor cycle performance, and achieve the effects of preventing agglomeration, good rate and cycle performance, and excellent specific capacity

Inactive Publication Date: 2022-01-07
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] In summary, in order to develop a new high-energy density lithium-ion battery conversion negative electrode, the present invention proposes a new solution to alleviate the poor cycle performance caused by the volume expansion of tin dioxide. At present, it has not been seen that tin oxide, titanium oxide and Redox graphene material composite to obtain lithium-ion battery anode materials with good electrochemical performance report

Method used

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  • Preparation method and application of SnO2-TiO2@rGO lithium ion battery negative electrode material
  • Preparation method and application of SnO2-TiO2@rGO lithium ion battery negative electrode material
  • Preparation method and application of SnO2-TiO2@rGO lithium ion battery negative electrode material

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Embodiment 1

[0033] (1) The freeze-dried graphene oxide (GO) was pulverized in a planetary ball mill at a speed of 40r / s for 6h, and then 0.1g of graphene oxide powder samples were taken and uniformly dispersed in 20ml of 1-allyl-3 - Methylimidazolium chloride organic solvent, stirred at 300rpm magnetic stirring speed for 12h, and ultrasonicated at 20KHz for 0.5h to obtain GO suspension.

[0034] (2) the composite metal source, 1.70g of SnCl 4 and 0.43g of TiCl 4 Slowly add the liquid into the GO suspension in a fume hood, and under the action of 300rpm magnetic stirring, wait until it is fully mixed, and react with water at 80°C for 10 hours to obtain a gray black suspension.

[0035] (3) Wash and centrifuge the above obtained sample 5 times, the centrifugal speed is gradually increased from 5000rpm to 7000rpm, the centrifugation time is gradually increased from 12 minutes to 15 minutes, then suction filtered once, and freeze-dried at a low temperature for 48 hours using a lyophilizer. T...

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Abstract

The invention belongs to the technical field of lithium ion batteries, provides a preparation method and application of a SnO2-TiO2@rGO lithium ion battery negative electrode material, and solves the problem of poor cycling stability of SnO2. According to the composite material negative electrode, two metal oxides of SnO2 and TiO2 are compounded under the hydrothermal reaction condition, the high specific capacity of SnO2 is exerted, meanwhile, the excellent cycling stability of TiO2 is exerted, meanwhile, the composite metal oxide is anchored to reduced graphene oxide, and the conductivity of the oxide is improved. Compared with other studied SnO2 negative electrodes, the prepared lithium ion battery negative electrode material has the advantages of excellent electrochemical performance, high specific capacity, excellent cycle stability and excellent rate capability.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a SnO 2 -TiO 2 Preparation method and application of @rGO lithium ion battery anode material. Background technique [0002] In the current society, lithium-ion batteries are widely used in various industries as green and environmentally friendly secondary batteries because of their small size, high theoretical specific capacity, no memory for charge and discharge, and small self-discharge. At the same time, in recent years, with the development of the green new energy industry represented by the electric vehicle industry and the development of various wearable and portable devices, the demand for lithium-ion power batteries with high energy density is increasing. Among them, the energy density of the electrode material directly restricts the energy density of the battery system. The traditional lithium-ion battery graphite negative electrode has a low theoretical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/48
CPCH01M4/364H01M4/48H01M4/0402Y02E60/10
Inventor 齐民曲杨璐董旭峰
Owner DALIAN UNIV OF TECH
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