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Phosphorus-based negative electrode material and preparation method thereof, negative electrode and lithium ion battery

A phosphorus-based negative electrode and negative electrode technology, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of large volume expansion, poor conductivity of red phosphorus, etc., and achieve low cost, uniform and stable material properties, and coating uniformity high effect

Inactive Publication Date: 2019-01-15
桑德新能源技术开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the phosphorus-based negative electrode is similar to the silicon-based negative electrode, which has a large volume expansion (300%, lithium-ion battery), and the conductivity of red phosphorus is relatively poor (10 -14 S / cm)

Method used

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  • Phosphorus-based negative electrode material and preparation method thereof, negative electrode and lithium ion battery
  • Phosphorus-based negative electrode material and preparation method thereof, negative electrode and lithium ion battery
  • Phosphorus-based negative electrode material and preparation method thereof, negative electrode and lithium ion battery

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preparation example Construction

[0047] combine figure 2Shown is the flow chart of the preparation method of phosphorus / porous carbon@graphene composite material of the present invention. The preparation method basically includes two steps: S1, preparing phosphorus / porous carbon composite material; S2, coating graphene on the outside of the phosphorus / porous carbon composite material. Among them, the specific preparation method of phosphorus / porous carbon composite material in S1 can adopt the method of solid-solid intermixing of phosphorus-carbon powder, and can also adopt the method of evaporation-deposition. Preferably, the present invention adopts an evaporation-deposition method to prepare the phosphorus / porous carbon composite material. In the method of coating graphene in S2, the phosphorus / porous carbon composite powder can be directly put into the graphene dispersion for coating, or the phosphorus / porous carbon composite can be added to the graphene oxide dispersion , and then in the presence of a...

Embodiment 1

[0059] In this embodiment, the specific surface area is about 1300m 2 / g, the pore volume is about 0.8cm 3 / g of activated carbon to prepare red phosphorus / activated carbon@graphene composite material, the preparation process is as follows:

[0060] ①Take 20g of commercial micron red phosphorus powder (about 20μm) and wash it repeatedly with deionized water to remove surface oxides, and dry it in vacuum for later use;

[0061] ② Place the dried micron red phosphorus powder in a ball mill jar at 500 rpm, and ball mill it in an inert atmosphere for 20 hours to obtain nanometer red phosphorus (about 700nm);

[0062] ③Mix the nano-red phosphorus and activated carbon in a sealed ceramic boat according to the mass ratio of 1:1, and then transfer it to a sealed quartz tube. In an inert atmosphere, first heat to 450°C and keep it for 2 hours to sublimate the red phosphorus, and then naturally cool down to Keep the temperature at around 275°C for 48 hours to completely convert white ...

Embodiment 2

[0070] The difference between this embodiment and Example 1 is only that in step 5, the addition amount of graphene oxide is 0.3g, that is, 9.7g phosphorus / porous carbon composite material is added in the dispersed graphene oxide aqueous solution (0.3g graphite oxide Alkene + 50ml). Refer to Example 1 for other operations and test methods.

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Abstract

The invention relates to a phosphorus-based negative electrode material, which comprises a core material and a coating material, wherein the core material is phosphorus / porous carbon composite material; The coating material is graphene, which is coated on the outside of the phosphorus / porous carbon composite material. The invention also relates to a preparation method of the phosphorus-based negative electrode material, preferably by evaporation. Phosphorus / porous carbon composites were prepared by deposition method, then dispersed in graphene oxide dispersion, and the graphene oxide was reduced to obtain graphene-coated phosphorus / porous carbon composites. The invention improves the electric conductivity and the anti-expansion stability of the phosphorus / porous carbon composite material by virtue of the high electric conductivity and the excellent mechanical toughness of the graphene and the like, thereby achieving the purpose of improving the electric conductivity of the phosphorus-based negative electrode and prolonging the cycle life of the phosphorus-based negative electrode battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a phosphorus-based negative electrode material and a preparation method thereof. Background technique [0002] Phosphorus has attracted increasing attention due to its high electrochemical activity in Li-ion and Na-ion batteries, as well as its high specific capacity (2595 mAh / g). Phosphorus has three allotropes, namely white phosphorus, red phosphorus and black scale. Because white phosphorus is flammable and unstable, red phosphorus and black scale are currently used as battery materials. Black scale is the most stable of the three allotropes, but black scale is very complicated to prepare, usually from white phosphorus or red phosphorus under high temperature and high pressure, under harsh conditions. Therefore, red phosphorus is widely used in phosphorus-based anode materials. [0003] However, the phosphorus-based negative electrode is similar to the silicon-based negat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/38H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 徐艳红王建平苗力孝
Owner 桑德新能源技术开发有限公司
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