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Porous graphene-coated modified lithium ion battery cathode material and preparation method thereof

A technology of porous graphene and lithium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor ion conductivity, achieve uniform pore size distribution, improve rate performance, and improve cycle performance.

Active Publication Date: 2016-03-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor ion conductivity caused when graphene completely and uniformly coats the positive electrode material of lithium-ion batteries, and to provide a porous graphene-coated and modified lithium-ion battery positive electrode material and its preparation method

Method used

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  • Porous graphene-coated modified lithium ion battery cathode material and preparation method thereof
  • Porous graphene-coated modified lithium ion battery cathode material and preparation method thereof
  • Porous graphene-coated modified lithium ion battery cathode material and preparation method thereof

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specific Embodiment approach 1

[0024] Specific embodiment one: the porous graphene-coated modified lithium-ion battery positive electrode material of this embodiment, the lithium-ion battery positive-electrode material of the porous graphene-coated modified lithium-ion battery is composed of a coating layer and a lithium-ion battery positive electrode material, The cladding layer is a porous graphene material, and the porous structure of the porous graphene material is on a sheet of single-layer graphene and oligolayer graphene (thickness 1~3nm), and the aperture size includes 0.35nm~2nm micropores and 2nm~50nm mesoporous, the specific surface area of ​​porous graphene is 1300m 2 / g~4000m 2 / g, the coating amount of porous graphene accounts for 0.5% to 10% of the total mass of porous graphene and lithium-ion battery cathode materials, and the thickness of the porous graphene coating layer is less than 10nm.

specific Embodiment approach 2

[0025] Embodiment 2: This embodiment is different from Embodiment 1 in that the positive electrode material of the lithium ion battery is a lithium ion battery positive electrode material with a layered structure, a spinel structure or an olivine structure. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0026] Specific embodiment three: the preparation method of the porous graphene-coated modified lithium-ion battery cathode material of the present embodiment is carried out according to the following steps:

[0027] 1. Preparation of porous graphene material: prepare 1mg / ml~5mg / ml graphite oxide aqueous solution, and after ultrasonication for 1h~4h, microwave at a power of 700w~100w for 3min~5min in a microwave oven to obtain microwave expanded graphite oxide; Prepare a porous graphene material by oxidizing graphite; prepare the obtained microwave-expanded graphite oxide into a 1 mg / ml-5 mg / ml microwave-expanded graphite oxide aqueous solution. KMnO 4 Add it to the microwave-expanded graphite oxide aqueous solution, react for 1h to 4h, according to the reaction equation 4KMnO 4 +3C+H 2 O=4MnO 2 +2KHCO3 +K2CO 3 Etch carbon atoms, and the reaction product is centrifuged and washed 6-8 times with deionized water to obtain MnO 2 Supported reduced graphite oxide, using oxalic...

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Abstract

The invention provides a porous graphene-coated modified lithium ion battery cathode material and a preparation method thereof, relates to the field of secondary batteries, in particular to a surface-coated modified lithium ion battery cathode material and a preparation method thereof, and aims to solve a problem of poor ionic conductivity which is caused by the fact that the lithium ion battery cathode material is wholly and uniformly coated with graphene. The porous graphene-coated modified lithium ion battery cathode material comprises a coating layer and a lithium ion battery cathode material, wherein the coating layer is made of a porous graphene material. The preparation method for the porous graphene-coated modified lithium ion battery cathode material comprises the following steps: 1, preparing the porous graphene material; and 2, preparing the porous graphene-coated modified lithium ion battery cathode material. Through adoption of the porous graphene-coated modified lithium ion battery cathode material prepared by the invention, the rate capacity and the cycle performance of a NCA material are improved. The porous graphene-coated modified lithium ion battery cathode material provided by the invention is applied to the field of batteries.

Description

Technical field: [0001] The invention relates to the field of secondary batteries, in particular to a surface-coated and modified lithium-ion battery cathode material and a preparation method thereof. Background technique: [0002] Lithium-ion batteries have the advantages of long cycle life, high power density, high energy density, and high voltage platform. They have been widely used in mobile phones, laptop computers and other electronic products, but it is still difficult to meet the requirements of electric vehicles, electric tools and other products. and safety requirements. Cathode material is a key factor affecting battery performance. [0003] In order to improve the structural stability of lithium-ion battery cathode materials, researchers usually use methods such as surface coating to avoid direct contact between the electrolyte of the material. The coating layer is usually electrochemically inert oxides, phosphates and fluorides. However, the above cladding mat...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/62H01M4/36H01M10/0525
CPCH01M4/366H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 杜春雨贺晓书尹鸽平陈诚徐星左朋建程新群马玉林高云智
Owner HARBIN INST OF TECH
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