Ternary anode material and preparation method and application thereof, lithium ion battery and electric vehicle

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, batteries, secondary batteries, etc., can solve the problems of inability to effectively improve the cycle stability of ternary materials, easy dissolution of transition metal ions, and poor high-temperature performance of ternary materials , to achieve the effects of improving cycle stability and rate performance, reducing electrochemical activity, and improving electrical conductivity

Inactive Publication Date: 2019-04-26
QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Ternary materials prepared by traditional methods have poor high-temperature performance, unstable high-pressure performance, and transition metal ions are easy to dissolve
A common measure is to coat the surface of the ternary material with alumina, titania or zirconia, but the modification and coating of the ternary material in the prior art cannot effectively improve the performance of the ternary material at high temperature and high voltage. Cycle stability, transition metal ions are easy to dissolve and other disadvantages, and the preparation process is relatively complicated and the manufacturing cost is high

Method used

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  • Ternary anode material and preparation method and application thereof, lithium ion battery and electric vehicle
  • Ternary anode material and preparation method and application thereof, lithium ion battery and electric vehicle
  • Ternary anode material and preparation method and application thereof, lithium ion battery and electric vehicle

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preparation example Construction

[0071] According to a second aspect of the present invention, a method for preparing the above-mentioned ternary positive electrode material is provided, comprising the following steps:

[0072] The ternary material, M1 y+2z-2x M2 x R1 y R2 z Dispersed with graphene in an alcohol solvent, separated to obtain solid phase components, and then heat-treated to coat the surface of the ternary material with M1 y+2z-2x M2 x R1 y R2 z and graphene to obtain a ternary cathode material.

[0073] In the present invention, the ternary cathode material can be prepared by mixing the raw materials, separating them, and then performing heat treatment. The technological process is simple, the operation is simple and convenient, and it is easy to implement. The processing raw material has a wide source, is economically easy to obtain, and is a non-toxic and environment-friendly raw material. The invention has no special restrictions on the environment, site, equipment, etc. The raw mate...

Embodiment 1

[0088] 1. Ternary cathode material

[0089] A kind of ternary cathode material, comprises ternary material (LiNi 0.6 co 0.2 mn 0.2 o 2 ) and the cladding layer coated on the surface of the ternary material, the cladding layer includes K 2 h 2 PO 4 and graphene.

[0090] Among them, K 2 h 2 PO 4 The mass percentage content in the ternary positive electrode material is 2%, and the mass percentage content of graphene in the ternary positive electrode material is 1%.

[0091] 2. Preparation of ternary cathode materials

[0092] (1) The ternary material, K 2 h 2 PO 4 and graphene are dispersed in ethanol, and the dispersion is by stirring, the stirring speed is 800r / s, the temperature is 40°C, and the stirring time is 10h.

[0093] (2) Obtain the solid phase components through suction filtration, and then heat-treat the solid phase components to make the surface of the ternary material coated with K 2 h 2 PO 4 and graphene to obtain a ternary positive electrode mater...

Embodiment 2-10

[0095] The difference between embodiment 2-10 and embodiment 1 is that M1 y+2z-2x M2 x R1 y R2 z different, as shown in Table 1.

[0096] M1 in Table 1 embodiment 2-10 y+2z-2x M2 x R1 y R2 z Specific types of

[0097]

[0098]

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Abstract

The invention provides a ternary anode material and a preparation method and application thereof, a lithium ion battery and an electric vehicle, and belongs to the technical field of lithium ion batteries. The ternary anode material comprises a ternary material and a coating layer coating the surface of the ternary material, wherein the coating layer comprises M1y+2z-2xM2xR1yR2z and graphene; M1 and M2 are metal elements, and R1 and R2 are anions containing phosphorus and/or sulfur. The graphene has excellent conductivity and improves the migration rate of metal ions to ions, so that the surface impedance of the ternary anode material can be effectively reduced; and the coating layer can effectively reduce the surface electrochemical activity of the anode material in a cycle process, increase the surface conductivity of the anode material, inhibit the corrosion effect of electrolyte decomposition products on the surface of the anode material, inhibit the dissolution of transition metalions and stabilize the structure of the anode material, the cycle stability and multiplying power performance of the lithium ion battery under high temperature and high voltage are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a ternary positive electrode material, a preparation method and application thereof, a lithium ion battery, and an electric vehicle. Background technique [0002] As a new type of green high-energy battery, lithium-ion batteries are widely used in mobile phones, cameras, notebooks, etc. Portable devices such as computers. In recent years, with the popularization of portable electronic devices and the development of electric tools and electric vehicles, higher requirements have been placed on lithium-ion batteries—the cycle stability and rate performance of lithium-ion batteries under high temperature and high pressure. [0003] Ternary materials prepared by traditional methods have poor high-temperature performance, unstable high-pressure performance, and easy dissolution of transition metal ions. A common measure is to coat the surface of the ternary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M4/625H01M4/628H01M10/0525H01M2220/20Y02E60/10
Inventor 汤依伟尚国志吴剑杨幸
Owner QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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