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Method for preparing electrode of lithium-ion battery

A lithium-ion battery and electrode technology, applied in the field of lithium batteries, can solve the problems of rapid charge capacity decay and low cycle life, and achieve the effects of improving electrical conductivity, improving cycle life and improving wettability.

Active Publication Date: 2019-04-09
TAIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the charging and discharging cycle, the volume will expand violently, and the highest expansion rate can reach 300%. Due to the violent expansion, a large number of cracks will be generated inside the material. As the number of cycles increases, the silicon particle negative electrode will be pulverized and broken, and will be separated from the negative electrode. chip, resulting in low cycle life and fast decay of charge capacity

Method used

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  • Method for preparing electrode of lithium-ion battery

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Embodiment 1

[0026] Lithium ion battery electrode is made according to the following steps in the present embodiment:

[0027] (1) Prepare a graphene oxide suspension, adopt the Hummers method to obtain graphene oxide, disperse the graphene oxide in deionized water after cleaning and drying, and form a graphene oxide suspension, store it in the dark for later use, graphite oxide The massfraction of graphene oxide in the olefin suspension is 5mg / L;

[0028] (2) Prepare the nano-silicon particle suspension, expose the fresh nano-silicon particles to the air for 10h under dark conditions, so that a uniform thin layer of SiO2 is formed on the surface of the fresh nano-silicon particles. 2 , and then ultrasonic treatment to disperse the silicon nanoparticles in deionized water to form a suspension of nano-silicon particles with a nano-silicon particle concentration of 6 mg / L;

[0029] (3) Add the graphene oxide suspension to the nano-silicon particle suspension, ultrasonically stir for 0.5, an...

Embodiment 2

[0032] Lithium ion battery electrode is made according to the following steps in the present embodiment:

[0033] (1) Prepare a graphene oxide suspension, adopt the Hummers method to obtain graphene oxide, disperse the graphene oxide in deionized water after cleaning and drying, and form a graphene oxide suspension, store it in the dark for later use, graphite oxide The massfraction of graphene oxide in the olefin suspension is 7mg / L;

[0034] (2) Prepare nano-silicon particle suspension, expose fresh nano-silicon particles to the air for 12h under dark conditions, and form a uniform thin layer of SiO on the surface of fresh nano-silicon particles 2 , and then sonicate to disperse the silicon nanoparticles in deionized water to form a suspension of nano-silicon particles with a concentration of 5 mg / L;

[0035] (3) The graphene oxide suspension is added to the nano-silicon particle suspension, ultrasonically stirred for 1.0h, and then suction filtered to form a layer of nano-...

Embodiment 3

[0038] Lithium ion battery electrode is made according to the following steps in the present embodiment:

[0039] (1) Prepare a graphene oxide suspension, adopt the Hummers method to obtain graphene oxide, disperse the graphene oxide in deionized water after cleaning and drying, and form a graphene oxide suspension, store it in the dark for later use, graphite oxide The massfraction of graphene oxide in the olefin suspension is 9mg / L;

[0040] (2) Prepare nano-silicon particle suspension, expose fresh nano-silicon particles to the air for 14h under dark conditions, and form a uniform thin layer of SiO on the surface of fresh nano-silicon particles 2 , and then sonicate to disperse the silicon nanoparticles in deionized water to form a suspension of nano-silicon particles with a concentration of 3 mg / L;

[0041] (3) Add the graphene oxide suspension to the nano-silicon particle suspension, ultrasonically stir for 1.5h, and then suction filter to form a layer of nano-silicon-gr...

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Abstract

The invention relates to a method for preparing an electrode of a lithium-ion battery, belonging to the technical field of lithium batteries. The method for preparing the electrode of the lithium-ionbattery disclosed by the invention includes the following steps: preparing a graphene oxide suspension, and storing the suspension in a dark environment for later use; preparing a nano-silicon particle suspension; adding the graphene oxide suspension to the nano-silicon particle suspension, performing ultrasonic stirring for 0.5-1.5h, and then performing suction filtration to form a layer of nano-silicon-graphene oxide paper on a filter membrane; and transferring the nano-silicon-graphene oxide paper from the filter membrane, performing air drying, heating to 670-730DEG C in a protective atmosphere, and performing heat preservation for 0.5-1.5h to obtain a nano-silicon-graphene paper composite electrode. The silicon-graphene composite electrode of the invention can be used as the negativeelectrode of the lithium-ion battery to effectively improve the specific capacity, energy density, cycle performance and other performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a lithium ion battery negative electrode active material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery). With the development of society, the application of lithium-ion batteries is becoming more and more extensive, and the requirements for the performance of lithium-ion batteries are also getting higher and higher. [0003] Lithium-ion batteries rely primarily on the movement of lithium ions between the positive and negative electrodes to function. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/1395H01M4/364H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 闫振忠
Owner TAIZHOU UNIV
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