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Lithium ion battery negative electrode material, and preparation method and application thereof

A lithium-ion battery and negative electrode material technology, applied in the field of materials, can solve the problems of easy structure damage, large volume change, and poor cycle stability, and achieve excellent rate performance, good cycle performance, and good stability.

Active Publication Date: 2019-09-10
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now the commercialized negative electrode material is graphite-like carbon material, and its theoretical specific capacity is only 372mAh / g. needs
[0003] At present, a lot of negative electrode materials have been studied, including carbon materials, titanium dioxide materials, and alloy materials such as silicon-based and tin-based materials. Carbon materials and titanium dioxide materials have good stability, but the specific capacity is not high, while alloy materials such as silicon-based and tin-based materials are relatively high. The capacity is high, but the volume changes greatly during the lithium intercalation and delithiation process, and the structure is easily broken, so the cycle stability is poor

Method used

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  • Lithium ion battery negative electrode material, and preparation method and application thereof
  • Lithium ion battery negative electrode material, and preparation method and application thereof
  • Lithium ion battery negative electrode material, and preparation method and application thereof

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preparation example Construction

[0030] The present invention also provides a preparation method of the lithium ion battery negative electrode material according to the above technical solution, which includes the following steps:

[0031] (1) Put Ti 3 AlC 2 , LiF and hydrochloric acid are mixed and heated, and the solid is collected by centrifugation to obtain layered Ti 3 C 2 material;

[0032] (2) The layered Ti obtained in the step (1) 3 C 2 The material is ultrasonically treated in water and centrifuged, the liquid is collected and then dried to obtain stripped Ti 3 C 2 material;

[0033] (3) The stripped Ti obtained in the step (2) 3 C 2 The materials, nickel sulfate, urotropine, and water are mixed and subjected to hydrothermal compounding to obtain negative electrode materials for lithium-ion batteries.

[0034] In the present invention, all raw materials are commercially available products.

[0035] The present invention will Ti 3 AlC 2 , LiF and hydrochloric acid are mixed and heated, and the solid is collect...

Embodiment 1

[0046] 1.5g Ti 3 AlC 2 Put it into a mixed solution of 2gLiF and 20mL 10mol / L hydrochloric acid and heat and stir at 30°C for 48h. The corroded sample was washed once with 1mol / L hydrochloric acid, and then washed with deionized water to pH 6 by centrifugation, added with 1000mL deionized water, sonicated for 3h under argon protection, centrifuged at 2000rpm for 1h, and the upper layer Freeze-drying to obtain stripped Ti 3 C 2 ; Take 0.1676g of stripped Ti 3 C 2 , Add 70mL of deionized water, add 0.1314g of nickel sulfate hexahydrate and 0.2g of uterolol after 30min of ultrasound, stir for 30min, transfer to a 100mL reactor, keep it at 90℃ for 10h, centrifuge with deionized water for three times Freeze drying, you can get Ni(OH) 2 / d-Ti 3 C 2 Composite materials.

[0047] figure 1 Ni(OH) 2 / d-Ti 3 C 2 The XRD pattern of the composite material, it can be seen from the figure that there is obvious α-phase Ni(OH) 2 And Ti 3 C 2 Peaks, proving that the material is indeed made of Ni(O...

Embodiment 2

[0051] 1.5g Ti 3 AlC 2 Put it into a mixed solution of 2g LiF and 20mL 10mol / L hydrochloric acid and heat and stir at 30°C for 48h. The corroded sample was washed once with 1mol / L hydrochloric acid, and then washed with deionized water to pH 6 by centrifugation, added with 1000mL deionized water, sonicated for 3h under argon protection, centrifuged at 2000rpm for 1h, and the upper layer Freeze-drying to obtain stripped Ti 3 C 2 ; Take 0.1676g of stripped Ti 3 C 2 , Add 70mL of deionized water, add 0.3942g of nickel sulfate hexahydrate and 0.2g of uterolol after 30min of ultrasound, stir for 30min, transfer to a 100mL reactor, keep it at 100℃ for 8h, centrifuge with deionized water for three times Freeze drying, you can get Ni(OH) 2 / d-Ti 3 C 2 Composite materials.

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Abstract

The invention provides a lithium ion battery negative electrode material, and a preparation method and an application thereof. The lithium ion battery negative electrode material comprises Ni(OH)2 anda d-Ti3C2 layer; and the Ni(OH)2 is grown on the surface of the d-Ti3C2 layer. The Ni(OH)2 is grown on the surface of the d-Ti3C2 layer; and the advantages of high theoretical specific capacity of the Ni(OH)2 and high stability of the d-Ti3C2 layer are fully combined, so that the advantages of the Ni(OH)2 and the d-Ti3C2 layer are complementary, and the rate performance and the cycle performanceof the lithium ion battery negative electrode material are effectively improved. The lithium ion battery negative electrode material has relatively good rate capability and cycle performance.

Description

Technical field [0001] The invention belongs to the technical field of materials, and particularly relates to a lithium ion battery negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have higher energy density, longer life cycle and higher voltage, so they occupy an important position in energy conversion and storage. With the rapid development of electronic devices, people have higher and higher performance requirements for electronic devices, and batteries are an important factor affecting the performance of electronic devices, so they have attracted widespread attention. The current commercialized negative electrode material is a graphite-like carbon material, and its theoretical specific capacity is only 372mAh / g. Although the actual specific capacity of the graphite-like carbon material prepared by the prior art is very close to the theoretical specific capacity, it still cannot meet the increasin...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M10/0525
CPCH01M4/364H01M4/52H01M10/0525Y02E60/10
Inventor 张新宇李晨阳秦家千刘日平
Owner YANSHAN UNIV
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