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Porous lithium salt aerogel coated graphite composite material and preparation method thereof

A composite material and aerogel technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of long cycle performance deviation of materials and difficulty in accommodating lithium ions, achieve reasonable pore distribution, improve initial efficiency, and improve liquid absorption. The effect of fluid retention

Inactive Publication Date: 2019-06-18
江苏贝肯盛创新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a porous lithium salt aerogel-coated graphite composite material and its preparation method, which has the advantages of increasing the ratio of the graphite negative electrode material, long cycle and safety performance, and solves the current problems. The lithium salt coated on the surface of the graphite material is difficult to accommodate sufficient lithium ions due to the lack of pores, which causes the long-term cycle performance of the material to deviate.

Method used

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  • Porous lithium salt aerogel coated graphite composite material and preparation method thereof

Examples

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Embodiment 1

[0026] A preparation method of porous lithium salt airgel coated graphite composite material, comprising the following steps:

[0027] 1) Preparation of alumina / silicon oxide / titania airgel;

[0028] Weigh 17.2g (0.13mol) of aluminum chloride into a beaker, add 172.9ml of distilled water and ethanol (96ml of distilled water and 76.9ml of ethanol) to dissolve it, stir until 10%wt alumina sol A is formed; weigh 18.9g at the same time (0.1mol) titanium chloride, add 189ml of water and ethanol (105ml of distilled water and 84ml of ethanol) and magnetically stir to make it dissolve, then add 62.4g (0.3mol) ethyl orthosilicate magnetically and 621ml of distilled water and stir for 24h and magnetically stir to make It generates 10%wt silica / titania composite sol B, then adds sol A to sol B and mixes evenly and then stirs for 30 minutes to make it disperse evenly, then adds 294g of propylene oxide and stirs rapidly for 30min, then in Let this sol stand until it forms a gel, i.e. alum...

Embodiment 2

[0034] A preparation method of porous lithium salt airgel coated graphite composite material, comprising the following steps:

[0035] 1) Preparation of alumina / silicon oxide / titania airgel;

[0036] Weigh 13.3 (0.1mol) of aluminum chloride and put it into a beaker, add 133ml of distilled water and ethanol (74ml of distilled water and 59ml of ethanol) to dissolve it, stir until 10%wt alumina sol A is formed; weigh 9.45g (0.05 mol) titanium chloride, add 94.5ml water and ethanol (52.5ml distilled water and 42ml ethanol) and magnetically stir to make it dissolve, then add 41.6g (0.2mol) ethyl tetrasilicate magnetically and 926ml distilled water and magnetically stir for 24h to make it Generate 5%wt silicon dioxide / titania composite sol B, then add sol A to sol B and stir for 30 minutes after mixing evenly, then add 193.05g of propylene oxide and stir for 30min quickly, then let it stand sol until it forms a gel, i.e. alumina / silica / titania airgel;

[0037] 2) Preparation of po...

Embodiment 3

[0042] A preparation method of porous lithium salt airgel coated graphite composite material, comprising the following steps:

[0043] 1) Preparation of alumina / silicon oxide / titania airgel;

[0044] Weigh 19.95 (0.15mol) of aluminum chloride into a beaker, add 199.5ml of distilled water and ethanol (111ml of distilled water and 88.5ml of ethanol) to dissolve it, stir until 10%wt alumina sol A is formed; weigh 37.8g at the same time (0.2mol) titanium chloride, add 378ml of water and ethanol (210ml of distilled water and 168ml of ethanol) and magnetically stir to dissolve it, then add 83.2g (0.4mol) of tetraethyl orthosilicate magnetically and 227ml of distilled water and magnetically stir for 24h to generate 20%wt silica / titania composite sol B, then add sol A to sol B, mix well and stir for 30 minutes, then add 563.8g of propylene oxide and stir for 30min quickly, then let the sol stand until It forms a gel, namely alumina / silica / titania airgel;

[0045] 2) Preparation of p...

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Abstract

The invention relates to the technical field of lithium ion battery material preparation, and discloses a porous lithium salt aerogel coated graphite composite material. The composite material is of acore-shell structure, wherein the inner core is graphite, and the shell is a porous lithium metaaluminate / lithium metasilicate / lithium titanate ternary compound. By use of the porous lithium salt aerogel coated graphite composite material and the preparation method thereof, the surface of the graphite is coated with the porous lithium salt compound, the characteristic of large own specific surface area of the porous lithium salt is used for improving the liquid adsorption and liquid retaining capability of the material, sufficient lithium ions are provided for subsequent charging and discharging, and the rate performance of the material is improved. Meanwhile, the sufficient lithium ions provide lithium ions for forming an SEI (Solid Electrolyte Interphase) membrane in an initial charging and discharging process, and the initial efficiency of the material is improved. The porous lithium salt compound prepared with an aerogel method has the characteristics of reasonable pore distribution and stable structure, can contain sufficient lithium ions, and supplements lithium ions consumed in the subsequent long-circulation process of materials so as to improve the circulation performance of the material.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion battery materials, in particular to a porous lithium salt airgel-coated graphite composite material and a preparation method thereof. Background technique [0002] With the rapid development of electric vehicles, lithium-ion batteries used in electric vehicles are required to have high safety performance and long cycle life. Although there are advantages in terms of cycle performance and cost, it is difficult to meet the needs of the future market in terms of specific capacity, large rate, long cycle and safety performance of the material, so it is necessary to use graphite material surface coating, doping and modification and other methods to improve the long cycle, large rate and high safety performance of graphite. [0003] For example, the patent (CN102820471A) discloses a high-safety lithium-ion battery negative electrode material and its preparation method, which mainly i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62
CPCY02E60/10
Inventor 熊焕明
Owner 江苏贝肯盛创新能源科技有限公司
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