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Solid electrolyte modified lithium titanate negative electrode material and preparation method thereof

A solid electrolyte, negative electrode material technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of poor material cycle and rate performance, poor appearance and quality of pole pieces, unstable coating process, etc. Controllable secondary particle size, low cost, and improved cycle and rate performance

Active Publication Date: 2021-03-09
JIANGSU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium titanate materials have encountered many problems in the process of industrial production. For example, it is not easy to be calcined into a pure phase, and there are many impurity phases, which lead to poor cycle and rate performance of the material; Frozen, poor processability, resulting in unstable subsequent coating process, poor appearance and quality of pole piece

Method used

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  • Solid electrolyte modified lithium titanate negative electrode material and preparation method thereof
  • Solid electrolyte modified lithium titanate negative electrode material and preparation method thereof
  • Solid electrolyte modified lithium titanate negative electrode material and preparation method thereof

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Embodiment approach 1

[0028] This embodiment provides a solid electrolyte modified lithium titanate negative electrode material. The microscopic appearance of the lithium titanate negative electrode material is as follows: the secondary particles are spherical and have a particle size of 5-20 μm. It is composed of primary particles of 20-200 nm; lithium titanate particles in the lithium titanate negative electrode material are attached with a lithium ion solid electrolyte composed of fluoride oxide and fluoride, and the mass fraction of the lithium ion solid electrolyte is 1%.

[0029] The preparation method of the above-mentioned solid electrolyte modified lithium titanate negative electrode material is as follows (the process flow is as follows: figure 1 ):

[0030] Mix industrial-grade anatase-type titanium dioxide with lithium carbonate and deionized water, grind and mix thoroughly in a sand mill, and prepare a suspension A with a solid content of 10%. Suspension A was prepared into precursor ...

Embodiment approach 2

[0032]This embodiment provides a solid electrolyte modified lithium titanate negative electrode material. The microscopic appearance of the lithium titanate negative electrode material is as follows: the secondary particles are spherical and have a particle size of 5-20 μm. It is composed of primary particles of 20-200 nm; lithium titanate particles in the lithium titanate negative electrode material are attached with a lithium ion solid electrolyte composed of fluoride oxide and fluoride, and the mass fraction of the lithium ion solid electrolyte is 2%.

[0033] The preparation method of the above-mentioned solid electrolyte modified lithium titanate negative electrode material is as follows (the process flow is as follows: figure 1 ):

[0034] Mix industrial-grade anatase-type titanium dioxide with lithium hydroxide and deionized water, and grind and mix thoroughly in a sand mill to prepare a suspension A with a solid content of 12%. Suspension A was prepared into precursor...

Embodiment approach 3

[0036] This embodiment provides a solid electrolyte modified lithium titanate negative electrode material. The microscopic appearance of the lithium titanate negative electrode material is as follows: the secondary particles are spherical and have a particle size of 5-20 μm. It is composed of primary particles of 20-200 nm; the lithium titanate particles in the lithium titanate negative electrode material are attached with a lithium ion solid electrolyte composed of fluoride oxide and fluoride, and the mass fraction of the lithium ion solid electrolyte is 1.5%.

[0037] The preparation method of the above-mentioned solid electrolyte modified lithium titanate negative electrode material is as follows (the process flow is as follows: figure 1 ):

[0038] Mix industrial-grade anatase-type titanium dioxide with lithium oxalate and deionized water, grind it in a sand mill and mix thoroughly to prepare a suspension A with a solid content of 8%. Suspension A was prepared into precur...

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Abstract

The invention relates to the field of electrode materials, and discloses a solid electrolyte modified lithium titanate negative electrode material and a preparation method thereof. The microscopic appearance of the lithium titanate negative electrode material is as follows: the secondary particles are spherical, and the particle size is 5-20 μm. The secondary particles are composed of primary particles with a grain size of 20-200 nm; the lithium titanate particles in the lithium titanate negative electrode material are attached to the lithium ion solid electrolyte composed of fluoride oxide and fluoride, and the lithium ion solid electrolyte The mass fraction is 0.1-3%; its preparation method is: one or more fluorine-containing lithium battery electrolytes, titanium dioxide and lithium salts are subjected to two times of sand milling, two times of spray granulation and two times of solid-phase calcination have to. The tap density of the prepared lithium titanate negative electrode material reaches 1.3 g / cm 3 Above, the pH value is 8‑10, and has a good rate performance, the 5C discharge capacity reaches 135 mAh g ‑1 above.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a solid electrolyte modified lithium titanate negative electrode material and a preparation method thereof. Background technique [0002] With the rapid development of my country's photovoltaic energy storage, aviation, aerospace, oil and gas drilling, and military industry, it is becoming increasingly urgent to develop new energy storage devices that can operate stably and for a long time in extreme environments. The developed energy storage devices are better than lead-acid Batteries and ordinary lithium batteries have a wider operating temperature range and will become the most likely candidates. Lithium titanate battery is more and more popular in the market due to its inherent advantages such as wide service temperature range, charge and discharge at -40°C low temperature, long cycle life, and high safety performance. The core material in a lithium titanate battery is its ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/62H01M10/0525
CPCH01M4/485H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 周海涛俞崇晨高宏权刘畅吴博
Owner JIANGSU UNIV
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