Porous lithium titanate material and preparation method thereof, negative electrode material and lithium ion battery

A technology of porous lithium titanate and negative electrode materials, applied in the direction of negative electrodes, titanates, secondary batteries, etc., can solve the problems of poor low temperature resistance, achieve low cost, improve low temperature resistance, and increase specific capacity.

Pending Publication Date: 2021-04-06
NORTHERN ALTAIR NANOTECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a porous lithium titanate material and its preparation method, negative electrode material and lithium ion battery, to solve the problem of poor low temperature resistance of lithium ion batteries in the prior art

Method used

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  • Porous lithium titanate material and preparation method thereof, negative electrode material and lithium ion battery
  • Porous lithium titanate material and preparation method thereof, negative electrode material and lithium ion battery
  • Porous lithium titanate material and preparation method thereof, negative electrode material and lithium ion battery

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preparation example Construction

[0022] In a typical implementation of the present application, a method for preparing a porous lithium titanate material is provided. The preparation method includes: step S1, homogenizing the mixed solution including titanium source, lithium source and dispersant in sequence , the first drying and the first calcination to obtain the primary product of lithium titanate; step S2, performing pelletizing treatment on the primary product of lithium titanate to obtain microspheres; and step S3, performing the second calcination on the microspheres to obtain porous titanate lithium material.

[0023] The longer the diffusion path of lithium ions in the lithium titanate material, the larger the concentration polarization and the worse the low temperature performance. This application redesigns the structure of the primary product of lithium titanate to obtain microspheres with a certain skeleton structure, and then performs a second calcination treatment on the microspheres, so that ...

Embodiment 1

[0041] Mix titanium in titanium dioxide and lithium in lithium carbonate with water at a molar ratio of 1:0.81 to obtain a mixed solution, which is sequentially ball milled, spray-dried, and first calcined to obtain the primary product of lithium titanate. Among them, the rotation speed of the ball mill is 3500rpm / min, the temperature of spray drying is 250°C, the temperature of the first calcination is 750°C, the heating rate of the first calcination is 10°C / min, and the first calcination is calcined after reaching the temperature of 750°C 4h, wherein the SEM image of the powder obtained after spray drying is as follows figure 1 shown.

[0042] Use zirconia beads as the grinding medium to carry out wet grinding treatment on the mixture of lithium titanate primary product and water to obtain a slurry of nano-sized particles with a particle size D90 of 560nm; The slurry is sprayed into pellets to obtain microspheres, and the SEM image of the microspheres is as follows figure...

Embodiment 2

[0044] The difference between Example 2 and Example 1 is that the molar ratio of titanium in titanium dioxide to lithium in lithium carbonate is 1:0.88 to obtain microspheres and finally obtain a porous lithium titanate material.

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Abstract

The invention provides a porous lithium titanate material and a preparation method thereof, a negative electrode material and a lithium ion battery. The preparation method comprises the following steps: S1, sequentially carrying out homogenization, first drying and first calcination on a mixed solution containing a titanium source, a lithium source and a dispersing agent to obtain a lithium titanate primary product; S2, carrying out pelletizing treatment on the lithium titanate primary product to obtain microspheres; and S3, carrying out second calcination on the microspheres to obtain the porous lithium titanate material. According to the porous lithium titanate material with the large specific surface area, the infiltration area of an electrolyte is increased, so that more de-intercalation sites are provided for lithium ions, polarization is reduced, the diffusion rate of the lithium ions is increased, the specific capacity, the energy density and the rate capability of a lithium ion battery are further improved, and the low temperature resistance of the lithium ion battery is further improved. In addition, the preparation method is simple and low in cost.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a porous lithium titanate material, a preparation method thereof, a negative electrode material and a lithium ion battery. Background technique [0002] As the low temperature of the environment drops, the specific capacity of lithium-ion battery materials will decrease in varying degrees, and the larger the temperature drop span, the greater the specific capacity drop. The deterioration of the diffusion kinetics of lithium ions in the negative electrode material is the main reason for limiting the low-temperature performance of lithium-ion batteries, which can usually be summarized as the following reasons: the viscosity of the electrolyte increases, resulting in a decrease in conductivity; + The diffusion rate in the active material decreases; the charge transfer resistance at the electrode / electrolyte interface increases. At present, the low-temperature performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00H01M4/485H01M10/0525
CPCC01G23/005H01M4/485H01M10/0525H01M2004/027H01M2004/021C01P2004/61C01P2006/12C01P2004/03C01P2006/40Y02E60/10
Inventor 游志江白岩成信刚雷磊
Owner NORTHERN ALTAIR NANOTECH CO LTD
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