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Coated tio 2 Graphite dual-ion battery composite cathode material and preparation method thereof

A composite cathode material, battery cathode technology, applied in battery electrodes, graphite, secondary batteries, etc., can solve the problems of electrolyte viscosity increase, affecting the fast charge and discharge performance of dual-ion batteries, etc., to improve cycle stability, excellent High current charge and discharge performance, reducing the effect of crushing

Active Publication Date: 2022-04-01
HUNAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the above method cannot effectively improve the problem of poor cycle stability of the battery due to the volume expansion of the graphite positive electrode; in addition, the addition of additives in the electrolyte will inevitably lead to an increase in the viscosity of the electrolyte, which will affect the rapid charge and discharge performance of the dual-ion battery.

Method used

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  • Coated tio <sub>2</sub> Graphite dual-ion battery composite cathode material and preparation method thereof
  • Coated tio <sub>2</sub> Graphite dual-ion battery composite cathode material and preparation method thereof
  • Coated tio <sub>2</sub> Graphite dual-ion battery composite cathode material and preparation method thereof

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preparation example Construction

[0031] See figure 1 The present invention provides a coating TiO in the present invention. 2 The graphite double ion battery composite positive material preparation method, including the steps of:

[0032] S1: Tetanyl titanate as TiO 2 The source, the titanate tetrabutyate is mixed with graphite powder and placed in anhydrous ethanol to obtain solid-liquid mixture;

[0033] S2: The solid solution mixture was stirred in a water bath magnetic stirrer until anhydrous ethanol was completely evaporated to give a sample;

[0034] S3: Heat the sample under an inert protective atmosphere to obtain a coating TiO 2 Graphite Double Ion Battery Composite Positive Material.

[0035] Preferably, the mass ratio of tetutyl titanate and graphite powder is (0.05-0.15): 1.

[0036] Preferably, the water bath in the step S2 is 40-70 ° C.

[0037] Preferably, the heating temperature in the step S4 is 400 ° C to 600 ° C, and the holding time is 3-6 hours.

[0038] The present invention also provides a ...

Embodiment 1

[0040] The titanate tetrabutyate and graphite powder were mixed with a mass ratio of 0.15: 1 and placed in an appropriate amount of anhydrous ethanol, which was placed in a 60 ° C water bath, and the continuous magnetic stirring was stirred until there was all evaporation of no water ethanol; The sample was carbonized at 600 ° C for 3 hours at an argon atmosphere, which was obtained by coating TiO. 2 Graphite Double Ion Battery Composite Positive Material.

[0041] Figure 2 (a) is a covering TiO 2 Graphite double ion battery composite positive material and uncoated TiO 2 X-ray diffraction spectrum (XRD) comparison diagram of graphite double ion battery positive electrode material, where the graph I is a coating TiO 2 X-ray diffraction spectrum (XRD) of graphite double ion battery composite positive material; graph II is uncoated TiO 2 X-ray diffraction spectrum (XRD) of graphite dual ion battery positive electrode material. Unclosed Tio 2 The graphite double ion battery positive m...

Embodiment 2

[0047] The titanate tetrabutyate and graphite powder were mixed with a mass ratio of 0.05: 1 and placed in an appropriate amount of anhydrous ethanol, which was placed in a 40 ° C water bath, until there was all evaporation of water absorbed ethanol; The sample was carbonized at 400 ° C for 6 hours at an argon atmosphere, which was obtained by coating TiO. 2 Graphite Double Ion Battery Composite Positive Material.

[0048] Figure 3 (a) is a covering TiO 2 Graphite double ion battery composite positive material SEM topography, TiO 2 The nanoparticles are evenly covered in the surface of the graphite. Figure 3 (b) is a covering TiO 2 Cycle performance diagram of graphite double ion battery composite positive electrode material at a current density of 2C, wherein the graph I is a coating TiO 2 Graphic efficiency graph of graphite double ion battery composite positive material; graph II is a coating TiO 2 Charlan Double Ion Battery Composite Positive Material Charging Capacity Diston;...

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Abstract

The invention provides a coated TiO 2 The preparation method of graphite double-ion battery composite cathode material comprises the following steps: S1: using tetrabutyl titanate as TiO 2 source, mix the tetrabutyl titanate and graphite powder evenly, and put them into absolute ethanol to obtain a solid-liquid mixture; S2: continuously stir the solid-liquid mixture in a water bath magnetic stirrer until anhydrous The ethanol is completely evaporated to obtain a sample; S3: heat and keep the sample under an inert protective atmosphere to obtain a coated TiO 2 Graphite composite cathode material for dual-ion batteries. Coated TiO provided by the present invention 2 The graphite dual-ion battery composite cathode material has better cycle performance.

Description

[Technical field] [0001] The present invention relates to the field of energy storage and conversion materials, and specific to a coating TiO 2 Graphite Double Ion Battery Composite Positive Materials and Preparation Methods thereof. 【Background technique】 [0002] The insertion of the insertion of the insertion of the insertion of the insertion of an anion of 120 mAhg -1 However, the anionic embedding will result in about 130% of volume expansion. At the same time, the working voltage of 5V is inevitably causes the decomposition of the electrolyte, so the actual plurality of graphite positive electrodes is less than the theoretical cycle capacity, and the cycle performance is poor and difficult to use. [0003] In the relevant technique, in order to solve the above problems, it is generally generally to increase the cycle stability of the double ion battery by replacing the high pressure additive in the electrolyte, or using other types of negative electrode materials to replace...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1393H01M4/36H01M4/583H01M4/62H01M10/054C01B32/20
CPCH01M4/366H01M4/583H01M4/625H01M10/054C01B32/20Y02E60/10
Inventor 陈玉喜韩方超
Owner HUNAN UNIV
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