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Lithium-supplementing porous silicon monoxide negative electrode material for lithium ion batteries and preparation method thereof

A lithium-ion battery and silicon monoxide technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as difficult performance, complex process, and improvement

Active Publication Date: 2019-02-05
CHENGDU EMINENT NEW ENERGY TECH CO LTD
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  • Application Information

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Problems solved by technology

Silicon material (nano-silicon, silicon-oxygen compound) is an ideal lithium battery negative electrode material with abundant reserves and wide sources. However, silicon also has some disadvantages as a negative electrode material: high expansion rate, poor conductivity and its ability to absorb liquid Deviation, resulting in its cycle performance and rate performance deviation affecting its use
One of the most commonly used methods to solve the above problems is to make silicon porous to form porous silicon or porous silicon-metal alloys, which can not only alleviate the volume expansion in the process of lithium storage, but also the metal dispersed in porous silicon can enhance its conductivity and improve Its rate performance, and at the same time pre-lithiation of silicon-based materials improves the first-time efficiency of its materials, and finally improves the cycle performance and energy density of its silicon-carbon composite materials; for example, the patent (application number: 201711008723.6) discloses a lithium battery negative electrode The preparation method of the material nanoporous silicon, which mainly prepares the porous nano-silicon material by vacuum heat treatment to improve the specific energy and cycle performance of the material, but the low efficiency and poor conductivity of the nano-silicon affect its rate performance and its material The first efficiency play; the patent (application number: 201310007838.9) discloses a preparation method of silicon monoxide / carbon composite negative electrode material for lithium ion batteries. The preparation method is to use ethyl orthosilicate as the silicon source and use sol-gel The porous silicon monoxide with xerogel or airgel structure is prepared by the method and the atmospheric pressure drying process, and the porous silicon monoxide is ball milled, and the nano-silicon monoxide / carbon composite negative electrode material is prepared by carbon coating and heat treatment. , the prepared porous pore size distribution is not uniform, the preparation process is complicated and the initial efficiency is low, which affects its cycle performance
It can be seen from the above that the existing preparation of porous silicon monoxide or the preparation process is complicated, the cost is high, the consistency is poor, and the first-time efficiency is low, which makes it difficult to greatly improve its performance, and these methods are often not suitable for large-scale production , hindering the industrialization process of porous silicon anode materials
In summary, the existing methods for preparing porous silicon still have defects such as complex process, high cost, low efficiency, and difficulty in greatly improving performance. Therefore, there is an urgent need for a nanoporous silicon preparation method that can solve the above problems

Method used

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  • Lithium-supplementing porous silicon monoxide negative electrode material for lithium ion batteries and preparation method thereof
  • Lithium-supplementing porous silicon monoxide negative electrode material for lithium ion batteries and preparation method thereof
  • Lithium-supplementing porous silicon monoxide negative electrode material for lithium ion batteries and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Mix 100g of silicon monoxide (particle size 5μm) and 5g of nano-nickel (particle size 200nm) into a ball mill, the diameter of the ball is 5mm, the ball-to-material ratio is 8:1, the ball milling speed is 500 rpm, and the ball milling is 24h, to get Silicon monoxide alloy material A; then place silicon monoxide alloy material A in a vacuum heat treatment furnace with a vacuum degree of 0.05 Pa; then heat at a temperature of 1500°C and keep it warm for 5 hours to obtain porous monoxide Silicon material B; naturally cool the porous silicon monoxide material B to 600°C, pass through methane gas and ammonia gas (volume ratio: 100:5), and keep at this temperature for 3 hours, and naturally cool down to room temperature to obtain porous silicon monoxide Silicon composite material C; then weigh 100g of porous silicon monoxide composite material C and 0.5g of inert lithium powder into a ball mill, and ball mill for 6 hours under an argon atmosphere to obtain lithium-replenishing...

Embodiment 2

[0027] Add 100g of silicon monoxide and 1g of nano-aluminum (particle size 100nm) into a ball mill with a ball diameter of 4mm, a ball-to-material ratio of 7:1, a ball milling speed of 500 rpm, and ball milling for 48 hours to obtain a silicon monoxide alloy material A; Afterwards, the silicon monoxide alloy material A is placed in a vacuum heat treatment furnace, and the vacuum degree is kept between 0.1Pa; then heated, and the temperature is kept between 1300°C and kept for 0.1h to obtain a porous silicon monoxide material B; the porous Silicon monoxide material B was naturally cooled to 800°C, acetylene gas and ammonia gas (volume ratio: 100:1) were introduced into it, and kept at this temperature for 1 hour, and then naturally cooled to room temperature to obtain porous silicon monoxide composite material C; Take 100g of porous silicon monoxide composite material C and 0.1g of inert lithium powder and add them to a ball mill, and ball mill for 1 hour under an argon atmosphe...

Embodiment 3

[0029] Add 100g of silicon monoxide and 10g of nano-silver (particle size 500nm) into a ball mill with a ball diameter of 6mm, a ball-to-material ratio of 10:1, a ball milling speed of 600 rpm, and ball milling for 12 hours to obtain a silicon monoxide alloy material A; Then place silicon monoxide alloy material A in a vacuum heat treatment furnace, keep the vacuum degree between 1Pa; then heat, keep the temperature between 1000°C, and keep it warm for 10h to obtain porous silicon monoxide material B; The temperature of silicon material B is naturally cooled to 800°C, and ethane gas and ammonia gas (volume ratio: 100:10) are passed through, and kept at this temperature for 6 hours, and the temperature is naturally cooled to room temperature to obtain porous silicon monoxide composite material C; Add 100g of porous silicon monoxide composite material C and 1g of inert lithium powder into a ball mill, and ball mill for 12 hours under an inert atmosphere to obtain lithium-replenis...

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Abstract

The invention relates to a lithium-supplementing porous silicon monoxide negative electrode material for lithium ion batteries and a preparation method thereof, and belongs to the technical field of preparation of lithium ion battery materials. The lithium-supplementing porous silicon monoxide negative electrode material is characterized in that the lithium-supplementing porous silicon monoxide negative electrode material is of a core-shell structure, porous silicon monoxide serves as an inner core, a nitrogen-doped carbon material serves as a shell, and the thickness of the shell is 50-500 nm. The lithium-supplementing porous silicon monoxide negative electrode material has the advantages that a carbon layer is uniformly deposited on the surface of the porous silicon monoxide, so that theporous silicon monoxide is prevented from directly contacting with the electrolyte, the occurrence probability of side reactions is reduced, and the electric conductivity is improved; meanwhile, by adopting the nitrogen-doped carbon material, the electric conductivity of a cladding layer can be further improved, and accordingly, the rate performance in lithium-supplementing porous silicon-carboncompounding is improved.

Description

technical field [0001] The invention relates to a lithium-supplementing porous silicon monoxide negative electrode material used in a lithium-ion battery and a preparation method thereof, belonging to the technical field of preparation of lithium-ion battery materials. Background technique [0002] As the market's requirements for the energy density of lithium-ion batteries increase, the anode materials used in lithium-ion batteries are required to have high specific capacity and cycle performance. At present, the commonly used anodes for lithium-ion batteries are mainly graphite materials, and their theoretical capacity is only 372mAh / g. It is far from meeting the demand for negative electrodes of lithium-ion batteries with a high specific energy density of 300WH / g. Silicon material (nano-silicon, silicon-oxygen compound) is an ideal lithium battery negative electrode material with abundant reserves and wide sources. However, silicon also has some disadvantages as a negativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 马春响王圆方代建国平国政乔乔李延立
Owner CHENGDU EMINENT NEW ENERGY TECH CO LTD
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