Lithium battery anode composite material and preparation method and application thereof

A lithium battery anode and composite material technology, which is applied in the field of lithium battery anode composite materials and its preparation, can solve the problems of electrode cycle performance degradation, material structure damage, volume expansion, etc., and achieve high cycle performance, reversible capacity, and good conductivity , the effect of reducing mechanical stress

Inactive Publication Date: 2020-08-21
犀望新能源科技(昆山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the lithium intercalation and de-cycling process, the transition metal oxide anode material has severe volume expansion and contraction, resulting in the destruction of the material structure and mechanical pulverization, which leads to the degradation of the electrode cycle performance.

Method used

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  • Lithium battery anode composite material and preparation method and application thereof

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Embodiment 1

[0030] Embodiment 1 The preparation method of lithium battery anode composite material

[0031] Include the following steps:

[0032] S1. The preparation method of the nano-magnesium-lithium alloy is as follows: after the magnesium-lithium alloy is ground by a planetary ball mill, the grinding speed is 550r / min, the grinding time is 10h, washed with deionized water, and dried to obtain the nano-magnesium-lithium alloy;

[0033] S2. Add 3g of copper nitrate, 1g of lanthanum nitrate, and 3g of aluminum nitrate into 50mL of ethylene glycol, stir and mix evenly, add dropwise 3mol / L NaOH solution to adjust the pH value to 9, continue stirring for 30min, then transfer to the polytetrafluoroethylene liner In the stainless steel hydrothermal reaction kettle, seal it and put it in an oven at 150°C for 12 hours, cool it, discard the supernatant, wash the solid product with deionized water, and dry it to obtain lanthanum aluminate copper;

[0034] S3. Grind 50g of graphite to less than ...

Embodiment 2

[0035] Embodiment 2 The preparation method of lithium battery anode composite material

[0036] Include the following steps:

[0037] S1. The preparation method of the nano-magnesium-lithium alloy is as follows: after the magnesium-lithium alloy is ground by a planetary ball mill, the grinding speed is 1000r / min, the grinding time is 15h, washed with deionized water, and dried to obtain the nano-magnesium-lithium alloy;

[0038] S2. Add 3g of copper nitrate, 1g of lanthanum nitrate, and 5g of aluminum nitrate into 50mL of ethylene glycol, stir and mix evenly, add dropwise 5mol / L NaOH solution to adjust the pH value to 10, continue stirring for 60min, and then transfer to the polytetrafluoroethylene liner In the stainless steel hydrothermal reaction kettle, seal it and place it in an oven at 170°C for 24 hours, cool it, discard the supernatant, wash the solid product with deionized water, and dry it to obtain lanthanum aluminate copper;

[0039]S3. Grind 50g of graphite to les...

Embodiment 3

[0040] Embodiment 3 The preparation method of lithium battery anode composite material

[0041] Include the following steps:

[0042] S1. The preparation method of the nano-magnesium-lithium alloy is as follows: after the magnesium-lithium alloy is ground by a planetary ball mill, the grinding speed is 700r / min, the grinding time is 12h, washed with deionized water, and dried to obtain the nano-magnesium-lithium alloy;

[0043] S2. Add 6g of copper nitrate, 2g of lanthanum nitrate, and 8g of aluminum nitrate into 100mL of ethylene glycol, stir and mix evenly, add dropwise 4mol / L NaOH solution to adjust the pH value to 8.5, continue stirring for 45min, then transfer to the polytetrafluoroethylene liner In the stainless steel hydrothermal reaction kettle, seal it and put it in an oven at 160 ° C for 18 hours, cool it, discard the supernatant, wash the solid product with deionized water, and dry it to obtain lanthanum copper aluminate;

[0044] S3. Grind 50g of graphite to less ...

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Abstract

The invention provides a lithium battery anode composite material which is formed by compounding nano magnesium-lithium alloy, lanthanum copper aluminate and graphite, the average grain size of the nano magnesium-lithium alloy is 5-15nm, the graphite and the nano magnesium-lithium alloy are used as a matrix, and the lanthanum copper aluminate is coated on the surface of the matrix to form the composite material. The preparation method of the lithium battery anode composite material is simple, and the prepared material has a store model, good mechanical and electrical properties, can significantly improve the cycle performance of a lithium ion battery, has good high and low temperature resistance, and can be applied to a fast-charging lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a lithium battery anode composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have witnessed the flourishing of modern electronic technology, becoming an essential part of modern ubiquitous portable electronic devices. Lithium electrochemical cells, more commonly known as batteries (packs), are used in a wide variety of military and civilian products. Many of these products use high-energy and high-power batteries. Due in part to the miniaturization of portable electronic devices, it is desirable to develop smaller lithium batteries with increased power capacity and service life. However, with the increasing demand for advanced devices with high energy and high power, especially the development of hybrid electric vehicles, the performance of commercial lithium-ion batteries has been difficult to achieve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/40H01M4/46H01M4/587H01M4/62H01M4/134H01M10/0525
CPCH01M4/134H01M4/364H01M4/405H01M4/466H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 袁峰
Owner 犀望新能源科技(昆山)有限公司
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