Lithium titanate negative electrode material and preparation method thereof

A negative electrode material, lithium titanate technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problem of hindering the intercalation of lithium ions and lithium titanate materials, the weak force of graphene sheets, and the easy gas production of batteries and other problems, to achieve excellent processing and cycle performance, excellent structural stability, and reduce the effect of hindrance

Active Publication Date: 2020-07-03
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 lithium titanate materials during charge and discharge. Combined, it affects the electrochemical properties of lithium titanate materials such as capacity and rate; at the same time, the force between graphene sheets is weak, and the secondary particle structure of lithium titanate added with graphene is relatively loose. Electrode cold pressure is easy to break, and the corresponding battery is easy to produce gas during cycling

Method used

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  • Lithium titanate negative electrode material and preparation method thereof

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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 titanate particle that particle diameter is 100nm, the functionalized graphene sheet layer that sheet thickness is 3nm, sheet plane diameter is 0.1 μ m is electronic conduction component (the lithium titanate 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 (stirring), a...

Embodiment 2

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

[0041] Step 1, select the lithium titanate particle that particle diameter is 100nm, the functionalized graphene sheet layer that sheet thickness is 3nm, sheet plane diameter is 0.1 μ m is electronic conduction component (the lithium titanate 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 titanate particle that particle diameter is 100nm, the functionalized graphene sheet layer that sheet thickness is 3nm, sheet plane diameter is 0.1 μ m is electronic conduction component (the lithium titanate 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 lithium titanate negative electrode material. The particle diameter D1 of the lithium titanate negative electrode material is 1 micron to 200 microns, the lithium titanate negative electrode material comprises secondary particle structures, the secondary particles consist of primary particles and an electron conduction component, the particle diameters D2 of the primary particles are smaller than or equal to 0.5D1; the electron conduction component comprises graphene slice layers, and the primary particles and the graphene slice layers are uniformly dispersed; strong binding force exists among the graphene slice 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 lithium titanate negative electrode material 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 lithium titanate negative electrode material 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: faster charging and discharging (such as 5C or even 10C), wider temperature range (such as minus 30 degrees Celsius) Use, etc.; In order to solve the above problems, it is necessary to find new electrode materials with more excellent performance. [0003] A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M4/131H01M10/0525
CPCH01M4/131H01M4/366H01M4/485H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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