Modification method for improving electrochemical performance of lithium-rich manganese-based material

A lithium-rich manganese-based, electrochemical technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve undesirable and inefficient problems, achieve high electronic conductivity and lithium ion diffusion rate, high efficiency, and tight integration Effect

Inactive Publication Date: 2018-03-23
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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Problems solved by technology

However, in the prior art, there is little research on the compounding of conductive agents, and performance upgrades are often achieved through simple superimposition or replacement of high-performance conductive agents. One or more of carbon, conductive graphite, flake graphite, carbon nanotubes
But this method is obviously inefficient and undesirable

Method used

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  • Modification method for improving electrochemical performance of lithium-rich manganese-based material

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preparation example Construction

[0039] At the same time, the present invention provides a method for preparing the above-mentioned lithium-ion battery lithium-rich manganese-based material positive electrode with a comprehensive three-dimensional conductive network, which includes: two parts for preparing the three-dimensional conductive network between the active materials of the positive electrode material and the conductive network of the current collector, including the following steps:

[0040]Step 1: The preparation of the three-dimensional conductive network between the active materials of the positive electrode material, as an optimization, there are two methods:

[0041] the first method:

[0042] (1) Disperse one or more of the above-mentioned certain amount of graphene, carbon nanotubes, carbon fiber materials and lithium-rich manganese-based materials in a solvent, and disperse them ultrasonically for 5-60 minutes;

[0043] (2) Add the obtained conductive agent solution dropwise into the lithium-...

Embodiment 1

[0057] Example 1: A modified preparation for improving the rate performance of lithium-rich manganese-based materials

[0058] The positive electrode sheet includes: a current collector, a conductive network coated on the current collector, and an active material with a three-dimensional conductive network.

[0059] The current collector is a common commercial aluminum foil;

[0060] The surface conductive network of the current collector is composed of 1 part of PVDF and 20 parts of graphene;

[0061] The active material coating consists of 75 parts lithium-rich manganese-based material Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 , 2.5 parts of graphene, 2.5 parts of carbon nanotubes, 10 parts of SP, and 10 parts of PVDF.

[0062] The preparation method is as follows:

[0063] (1) Disperse the weighed graphene, carbon nanotubes and lithium-rich manganese-based materials in ethanol, and disperse them ultrasonically for 30 minutes;

[0064] (2) Graphene solution is added dropwis...

Embodiment 2

[0071] The positive electrode sheet includes: a current collector, a conductive network coated on the current collector, and an active material with a three-dimensional conductive network.

[0072] The current collector is a common commercial aluminum foil;

[0073] The surface conductive network of the current collector is composed of 1 part of PVDF and 20 parts of graphene;

[0074] The active material coating consists of 75 parts lithium-rich manganese-based material Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 , 5 parts of graphene, 10 parts of SP, 10 parts of PVDF.

[0075] The preparation method is the same as in Example 1.

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Abstract

The invention provides a modification method for improving electrochemical performance of a lithium-rich manganese-based material. The modification method is characterized in that a three-dimensionalconductive network of an active substance of a cathode material of the lithium-rich manganese-based material is prepared from one or more of two-dimensional conductive agent graphene, carbon nano-tubes and carbon fibers, one or more of a one-dimensional conductive agent, an SP conductive agent, acetylene black and conductive graphite as well as a zero-dimensional conductive agent by compositing. Compared with a traditional pole piece, the prepared lithium-rich manganese-based material cathode piece with the comprehensive three-dimensional conductive network has higher electron conductivity andlithium ion diffusion rate, and the active substance is more tightly combined with a current collector, so that the polarization effect of a lithium-rich manganese-based material battery can be greatly reduced, the rate performance of the battery is obviously improved, and the cycle stability of the battery can also be improved. The method is convenient to operate and has simple steps and high practicality.

Description

technical field [0001] The invention belongs to the field of lithium battery materials, and in particular relates to a method and a modification process of a lithium-rich manganese-based positive electrode material for a lithium ion battery. Background technique [0002] Lithium-ion power batteries have the characteristics of high working voltage, high energy density, light weight, small size, low self-discharge rate, long cycle life, no memory effect, good safety performance, excellent anti-bulging performance, and environmental friendliness. And the main on-board power battery of new energy vehicles such as hybrid vehicles. At present, electric vehicles mainly face problems such as short cruising range and insufficient safety, and the insufficient performance of power batteries restricts their large-scale promotion. Recently, relevant departments such as the Ministry of Science and Technology and the Ministry of Industry and Information Technology stated that the energy d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505
CPCH01M4/505Y02E60/10
Inventor 武建飞李希超刘涛臧朝孙士美
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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