Alkaline earth metal germanate nanomaterial and preparation method thereof and use thereof as cathode material of lithium ion battery

An alkaline earth metal salt and alkaline earth metal technology, applied in battery electrodes, nanotechnology, chemical instruments and methods, etc., can solve the problems of cyclability that cannot meet actual requirements, difficulty in large-scale production, complicated preparation process, etc. The effect of poor performance, easy availability of raw materials and simple process

Active Publication Date: 2012-06-20
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, germanium-carbon composite materials also have some problems. Vapor deposition and polymerization-pyrolysis methods are usually used for preparation. These methods also have complicated preparation processes, low yields, and are difficult to produce on a large scale.
[0008] In addition to the above-mentioned germanium-carbon composite materials, there are also researches on the use of germanium compounds, such as germanium dioxide (GeO 2 ), germanium disulfide (GeS 2 ), lithium germanium phosphate (LiGe 2 (PO 4 ) 3 ) as a negative electrode material, they will form germanium particles embedded in Li during the first charge and discharge process 2 O. Li 2 S. Li 3 PO 4 In other matrix substances, it also plays the role of buffering volume changes, but the cycle performance still cannot meet the actual requirements, and the specific capacity is low

Method used

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  • Alkaline earth metal germanate nanomaterial and preparation method thereof and use thereof as cathode material of lithium ion battery
  • Alkaline earth metal germanate nanomaterial and preparation method thereof and use thereof as cathode material of lithium ion battery
  • Alkaline earth metal germanate nanomaterial and preparation method thereof and use thereof as cathode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1, the preparation of calcium germanate nanomaterial and its electrochemical performance test

[0037] According to Ca(CH 3 COO) 2 ·H 2 O:GeO 2 = 2:7 The ratio of the amount of the substance is weighed, ultrasonically stirred in water for 30min, mixed evenly and then transferred to the lining of a 25mL polytetrafluoroethylene autoclave, which is put into a stainless steel autoclave and heated at 10°C / min heating rate, from room temperature to 180 ° C, and maintained for 24 hours, then naturally cooled to room temperature, washed with deionized water three times, centrifuged and dried to obtain a white powder.

[0038] Characterization of calcium germanate nanomaterials:

[0039] Powder X-ray diffractometer (Rigaku DmaxrB, CuK α ray) analysis to determine the structure, the results are as follows figure 1 shown. As can be seen from the figure, there is no impurity peak in the spectrogram, indicating that the product has high purity and is the target prod...

Embodiment 2

[0044] Embodiment 2, the preparation of calcium germanate nanomaterial and its electrochemical performance test

[0045] According to Ca(OH) 2 :GeO 2 = 1:1 The ratio of the amount of the substance is weighed, ultrasonically stirred in water for 30min, mixed evenly and then transferred to the lining of a 50mL polytetrafluoroethylene autoclave, which is put into a stainless steel autoclave and heated at 20 ° C. / min heating rate, from room temperature to 200 ° C, and maintained for 48 hours, then naturally cooled to room temperature, washed with deionized water three times, centrifuged and dried to obtain a white powder.

[0046] The structure confirmation results and the apparent physical form, length and diameter of the white powder are the same as in Example 1.

[0047] The positive electrode, negative electrode, electrolyte and battery assembly of the simulated battery are exactly the same as in Example 1. The calcium germanate prepared in this example and the test results...

Embodiment 3

[0048] Embodiment 3, the preparation of calcium germanate nanomaterial and its electrochemical performance test

[0049] According to Ca(CH 3 COO) 2 ·H 2 O:GeO 2 = 2:1 The ratio of the amount of the substance is weighed, ultrasonically stirred in water for 30min, mixed evenly and then transferred to the lining of a 25mL polytetrafluoroethylene autoclave, which is placed in a stainless steel autoclave and heated at 30 ° C. / min heating rate, from room temperature to 200 ° C, and maintained for 24 hours, then naturally cooled to room temperature, washed with deionized water three times, centrifuged and dried to obtain a white powder.

[0050] The structure confirmation results and the apparent physical form, length and diameter of the white powder are the same as in Example 1.

[0051] The positive electrode, negative electrode, electrolyte and battery assembly of the simulated battery are the same as in Example 1. The calcium germanate prepared in this example and the test ...

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Abstract

The invention discloses an alkaline earth metal germanate nanomaterial and a preparation method thereof and use of the nanomaterial as a cathode material of lithium ion batteries. The method comprises the following steps of: (1) mixing an aqueous solution of alkaline earth metal salt and germanium source compound GeO2 to obtain a liquid mixture; (2) allowing reaction of the liquid mixture obtained in the step (1) to take place in a polytetrafluoroethylene-lined high-pressure reaction kettle after heating, and cooling after the reaction is completed to obtain the alkaline earth metal germanate nanomaterial. The method is simple, has abundant and easily-available raw materials, is suitable for large-scale production and has a high level of practicability. The obtained alkaline earth metal germanate is a nanomaterial, has a high actual capacity, can be directly used as a cathode material of lithium ion batteries, solves the problem that the germanium-based material as lithium ion battery cathode material has a poor cycling property and takes a violent change of volume during charging/discharging process, and can be directly used as the cathode material of lithium ion batteries.

Description

technical field [0001] The invention relates to an alkaline earth metal germanate nanometer material, a preparation method thereof and an application as a negative electrode material of a lithium ion battery. Background technique [0002] With the rapid development of energy, transportation, information, national defense and other fields, higher requirements are put forward for the performance of energy storage devices. Lithium-ion batteries have become a popular choice for portable electronics such as notebook computers, tablet computers, and mobile phones because of their outstanding advantages such as high working voltage, high energy density, large capacity, small self-discharge, good cycle performance, long service life, light weight, and small size. Ideal power supply for devices. In order to meet the actual use requirements such as safety, stability, and long standby time, high-capacity, long-life lithium-ion batteries have become an important research direction for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G17/00H01M4/485B82Y40/00
CPCY02E60/122Y02E60/10
Inventor 宋卫国李伟郭玉国殷雅侠
Owner INST OF CHEM CHINESE ACAD OF SCI
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