A kind of negative electrode material of lithium ion battery and its preparation method and application

A technology of lithium-ion batteries and negative electrode materials, applied in the field of materials, can solve problems such as unsatisfactory, easily broken structure, and large volume changes

Active Publication Date: 2021-05-07
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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  • A kind of negative electrode material of lithium ion battery and its preparation method and application
  • A kind of negative electrode material of lithium ion battery and its preparation method and application
  • A kind of negative electrode material of lithium ion battery and its preparation method and application

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preparation example Construction

[0030] The present invention also provides a preparation method for the lithium ion battery negative electrode material described in the above technical solution, comprising the following steps:

[0031] (1) Put Ti 3 AlC 2 , LiF and hydrochloric acid were mixed and heated, and the solid was 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 was sonicated in water followed by centrifugation, the liquid was collected and then dried to obtain the exfoliated Ti 3 C 2 Material;

[0033] (3) the stripped Ti obtained in the step (2) 3 C 2 The material, nickel sulfate, urotropine and water are mixed and then hydrothermally compounded to obtain the negative electrode material of the lithium ion battery.

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

[0035] In the present invention, Ti 3 AlC 2 , LiF and hydrochloric acid were mixed and heated, and the solid...

Embodiment 1

[0046] 1.5g of Ti 3 AlC 2 Put into a mixed solution of 2gLiF and 20mL 10mol / L hydrochloric acid and heat and stir at 30°C for 48h. Wash the corroded sample once with 1mol / L hydrochloric acid, then centrifuge and wash with deionized water until the pH value is 6, add 1000mL deionized water, sonicate for 3h under the protection of argon, and centrifuge at 2000rpm for 1h. liquid freeze-dried to obtain the exfoliated Ti 3 C 2 ; Take 0.1676g of stripped Ti 3 C 2 , add 70mL deionized water, add 0.1314g nickel sulfate hexahydrate and 0.2g utolopine after ultrasonication for 30min, stir for 30min, transfer to 100mL reaction kettle, keep warm at 90℃ for 10h, centrifuge and wash with deionized water three times Freeze-dry to get Ni(OH) 2 / d-Ti 3 C 2 composite material.

[0047] figure 1 is 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 an obvious α-phase Ni(OH) 2 and Ti 3 C 2 peaks, proving that the material i...

Embodiment 2

[0051] 1.5g of Ti 3 AlC 2 Put into a mixed solution of 2g LiF and 20mL 10mol / L hydrochloric acid and heat and stir at 30°C for 48h. Wash the corroded sample once with 1mol / L hydrochloric acid, then centrifuge and wash with deionized water until the pH value is 6, add 1000mL deionized water, sonicate for 3h under the protection of argon, and centrifuge at 2000rpm for 1h. liquid freeze-dried to obtain the exfoliated Ti 3 C 2 ; Take 0.1676g of stripped Ti 3 C 2 , add 70mL deionized water, add 0.3942g nickel sulfate hexahydrate and 0.2g utolopine after ultrasonication for 30min, stir for 30min, transfer to 100mL reaction kettle, keep warm at 100℃ for 8h, centrifuge and wash three times with deionized water Freeze-dry to get Ni(OH) 2 / d-Ti 3 C 2 composite material.

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Abstract

The invention provides a lithium ion battery negative electrode material, a preparation method and application thereof. The lithium ion battery negative electrode material provided by the invention comprises Ni(OH) 2 and d‑Ti 3 C 2 layer; the Ni(OH) 2 Grown on d‑Ti 3 C 2 layer surface. The present invention will Ni(OH) 2 Grown on d‑Ti 3 C 2 The surface of the layer is fully combined with Ni(OH) 2 High theoretical specific capacity and d‑Ti 3 C 2 The advantages of good layer stability make the two complement each other and effectively improve the rate performance and cycle performance of lithium-ion battery anode materials. The lithium ion battery negative electrode material provided by the invention has better rate performance and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a lithium ion battery negative electrode material, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries play an important role in energy conversion and storage due to their high energy density, long life cycle, and high voltage. 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. Now the commercialized negative electrode material is graphite-like carbon material, and its theoretical specific capacity is only 372mAh / g. demand. [0003] At present, the anode materials that have been studied more include carbon materials, titanium dioxide materials, and alloy materials such as silicon-based and tin-based materials. Ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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