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Cathode material for lithium ion batteries and preparation method thereof

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as hindering the intercalation of lithium ions and primary particles, easy rupture of electrodes under cold pressing, and weak force on graphene sheets. , to achieve excellent processing and cycle performance, excellent structural stability, and minimize the effect of obstruction

Inactive Publication Date: 2017-11-03
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, due to the unique flexible two-dimensional planar structure of graphene materials, its sheets are very easy to coat nano-sized lithium titanate particles inside, thus hindering the intercalation between lithium ions and primary particles during charge and discharge. It affects the electrochemical performance of the primary particle material such as capacity and rate; at the same time, the force between the graphene sheets is weak, and the structure of the secondary particle positive electrode material added with graphene is relatively loose. During the battery preparation process, the cold pressure of the electrode is Easy to break, thus affecting its electrochemical performance

Method used

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  • Cathode material for lithium ion batteries and preparation method thereof

Examples

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Embodiment 1

[0035] Embodiment 1 differs from Comparative Example 1 in that the present embodiment comprises the following steps:

[0036] Step 1, select the lithium iron phosphate particle that particle diameter is 100nm, the functionalized graphene sheet layer that sheet thickness is 3nm, sheet plane diameter is 0.1 μm is electron conduction component (the lithium iron phosphate particle and graphene between The mass ratio is 99:1); the functional group (including hydroxyl, carboxyl and carbonyl) content is 0.5% of the mass of the entire electron-conducting component, and the precursor is obtained after being uniformly mixed with the solvent;

[0037] Step 2, through the hydrothermal reaction, the graphene molecules of the electron-conducting components containing functional groups are cross-linked to form a strong bonding force to complete the construction of the conductive network, and at the same time fix the primary particles in the network structure; Through mechanical shearing (sti...

Embodiment 2

[0040] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0041] Step 1, select the lithium iron phosphate particle that particle diameter is 100nm, the functionalized graphene sheet layer that sheet thickness is 3nm, sheet plane diameter is 0.1 μm is electron conduction component (the lithium iron phosphate particle and graphene between The mass ratio is 99:1); the functional group (including hydroxyl, carboxyl and carbonyl) content is 1% of the mass of the entire electron-conducting component, and the precursor is obtained after being uniformly mixed with the solvent;

[0042] Others are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0043] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0044] Step 1, select the lithium iron phosphate particle that particle diameter is 100nm, the functionalized graphene sheet layer that sheet thickness is 3nm, sheet plane diameter is 0.1 μm is electron conduction component (the lithium iron phosphate particle and graphene between The mass ratio is 99:1); the functional group (including hydroxyl, carboxyl and carbonyl) content is 2% of the mass of the entire electron-conducting component, and the precursor is obtained after being uniformly mixed with the solvent;

[0045] Others are the same as in Example 1, and will not be repeated here.

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Abstract

The invention belongs to the field of energy storage research, and particularly relates to a cathode material for lithium ion batteries. The particle diameter D1 of the cathode material for the lithium ion batteries is 1 micron to 200 microns, the cathode material for the lithium ion batteries comprises secondary particle structures, the secondary particles consist of primary particles and an electron conduction component, the particle diameters of the primary particles are D2, and D2 is smaller than or equal to 0.5D1; the electron conduction component comprises graphene sheet layers, and the primary particles and the graphene sheet layers are uniformly dispersed; strong binding force exists among the graphene sheet layers; namely, a conductive network structure with flexibility can be constructed, and lithium titanate primary particles are fixed in the network structure, so that the cathode material for the lithium ion batteries with good performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a positive electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have brought revolutionary changes to the field of energy storage since their birth due to their advantages such as fast charging and discharging, good low-temperature performance, large specific energy, small self-discharge rate, small size, and light weight. Used in various portable electronic devices and electric vehicles. However, with the improvement of people's living standards, higher user experience puts forward higher requirements for lithium-ion batteries: longer standby time, faster charging and discharging speed, etc.; in order to solve the above problems, it is necessary to find new ones with better performance electrode material. [0003] At present, the commercial lithium-ion battery cathode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/362H01M4/625H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH