Phosphorus-contained negative electrode composite material and preparation method therefor, and lithium ion battery

A composite material and negative electrode technology, which is applied in the field of phosphorus-containing negative electrode composite materials and its preparation, and lithium-ion batteries, can solve the problems of difficult morphology, difficult preparation of red phosphorus, and easy agglomeration, and achieve the goal of improving the reversibility of electrochemical lithium storage Effect

Active Publication Date: 2016-08-10
TSINGHUA UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, nano-scale red phosphorus is difficult to prepare, its shape is difficult to control and it is ea...

Method used

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  • Phosphorus-contained negative electrode composite material and preparation method therefor, and lithium ion battery
  • Phosphorus-contained negative electrode composite material and preparation method therefor, and lithium ion battery
  • Phosphorus-contained negative electrode composite material and preparation method therefor, and lithium ion battery

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preparation example Construction

[0039] see figure 1 , the embodiment of the present invention provides the preparation method 100 of the above phosphorus-containing negative electrode composite material, comprising the following steps:

[0040] S102, providing the above components (1)~(3); and

[0041] S104, uniformly mechanically mixing the above components (1)-(3).

[0042] In the step S104, the components (1)-(3) can be directly stirred and mixed uniformly, the components (1)-(3) are solid particles, and the mixing temperature can be normal temperature. In the step S104, the phosphorus-containing negative electrode composite material can be obtained after uniformly mixing the components (1)-(3), that is, it is not necessary to perform high-temperature heat treatment on the mixed material.

[0043] This mixing step can be simple mechanical mixing, for example, it can be mixed by rotating an electric stirring paddle in a container with the above components (1)-(3), or even can be stirred and mixed by a ha...

Embodiment 1

[0063] see image 3 and Figure 4 and uniformly mixing elemental silicon particles, activated carbon particles and red phosphorus particles to form the phosphorus-containing negative electrode composite material. The mass percentage of the activated carbon in the phosphorus-containing negative electrode composite material is about 47.5%. The mass percentage of the red phosphorus in the phosphorus-containing negative electrode composite material is about 50%. The mass percentage of the elemental silicon in the phosphorus-containing negative electrode composite material is about 2.5%. The average particle size of the red phosphorus particles is about 2 microns. The average particle size of the activated carbon is about 5 microns. from Figure 4 It can be seen that the three elements of carbon, silicon and phosphorus are basically evenly distributed after mixing.

[0064] The phosphorus-containing negative electrode composite material is used as a negative electrode active ...

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Abstract

The invention relates to a phosphorus-contained negative electrode composite material. The composite material comprises red phosphorus, a conductive carbon elementary substance, and at least one kind of elemental silicon and silicon monoxide. The invention also relates to a preparation method for the phosphorus-contained negative electrode composite material, wherein the preparation method comprises the steps of providing the red phosphorus and a silicon-carbon compound, and enabling the red phosphorus and the silicon-carbon compound to be uniformly mixed. The invention also relates to a lithium ion battery.

Description

technical field [0001] The invention relates to a phosphorus-containing negative electrode composite material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have become portable electronic devices and environmentally friendly electric vehicles due to their advantages such as high mass and volume specific capacity, high output voltage, low self-discharge rate, wide operating temperature range, fast charge and discharge, and no memory effect. ideal power supply. With the further popularization of portable electronic devices and the development of electric vehicles, lithium-ion batteries will occupy a broader market in the future. In order to meet the requirements of the market for the performance of lithium-ion batteries, the development of higher-performance lithium-ion batteries will become the main goal of related research fields in the future. [0003] As an important part of lithium-ion batteries, anode mater...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/364H01M4/625H01M10/0525Y02E60/10
Inventor 王莉何向明李骄阳李建军尚玉明
Owner TSINGHUA UNIV
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