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Soft carbon-coated boron-doped silicon-based negative electrode material and preparation method and application thereof

A technology of silicon-based negative electrode materials and doping materials, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of limiting the diffusion rate of lithium ions, limiting practical applications, and poor conductivity.

Inactive Publication Date: 2021-09-07
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, a series of shortcomings such as the volume expansion effect and poor conductivity of the silicon-based anode material itself limit its practical application.
At the same time, the poor intrinsic conductivity of the silicon-based material itself limits the diffusion rate of lithium ions, which affects the charge and discharge rate of the battery.
[0004] At present, it is relatively common in the industry to improve the conductivity of lithium-ion battery anode materials by doping conductive polymers. 3 o 4 The microspheres are mixed for carbon coating, and then coated with a conductive polymer film to form a double-shell structure. Although the conductivity of the material is improved, the processing process is cumbersome and has undergone ultrasonic dispersion and centrifugation, filtration and washing, and acid etching. More steps, such as processing, require higher costs
[0005] In addition, the more commonly used method is to use a thicker carbon layer coating to obtain a powder conductivity higher than 2.0S / cm, but the thicker carbon layer coating is easy to crack, which affects the cycle stability of the material

Method used

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  • Soft carbon-coated boron-doped silicon-based negative electrode material and preparation method and application thereof
  • Soft carbon-coated boron-doped silicon-based negative electrode material and preparation method and application thereof
  • Soft carbon-coated boron-doped silicon-based negative electrode material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1 provides a soft carbon-coated boron-doped silicon-based negative electrode material.

[0040] The soft carbon-coated boron-doped silicon-based lithium-ion battery anode material of this embodiment is designated as sample 1#. It is composed of 96wt% silicon oxide, 0.8wt% sodium borohydride and 3.2wt% soft carbon coated outside.

[0041] The specific preparation process is as follows: Sodium borohydride and silicon oxide are spray-dried in the above ratio to obtain the primary product, and then the primary product is placed in a high-temperature rotary furnace under an argon atmosphere to raise the temperature to 1200 ° C, and the volume ratio is 1:1. Chemical vapor deposition was carried out on propylene with an equal amount of argon, and the temperature was kept for 2 hours. The gas source was turned off and the temperature was lowered to obtain sample 1#.

[0042] Weigh the obtained negative electrode material, conductive additive carbon black, sodium cel...

Embodiment 2

[0046] Embodiment 2 provides a soft carbon-coated boron-doped silicon-based negative electrode material.

[0047] The soft carbon-coated boron-doped silicon-based lithium-ion battery anode material of this embodiment is designated as sample 2#. It is composed of 95.9wt% doped silicon oxide, 1wt% boron chloride and 3.1wt% soft carbon coated outside.

[0048] The specific preparation process is as follows: Boron chloride and doped silicon oxide are mixed mechanically in the above ratio to obtain the primary product, and then the primary product is placed in a high-temperature rotary furnace under an argon atmosphere and the temperature is raised to 1200°C, with a volume ratio of 1:1 Pass in propane equivalent to argon gas for chemical vapor deposition, keep warm for 2.5 hours, turn off the gas source and cool down to obtain sample 2#.

[0049] The preparation of the negative electrode sheet, battery assembly and testing process are the same as in Example 1. The test results sho...

Embodiment 3

[0052] Embodiment 3 provides a soft carbon-coated boron-doped silicon-based negative electrode material.

[0053] The soft carbon-coated boron-doped silicon-based lithium-ion battery anode material of this embodiment is designated as sample 3#. It is composed of 97wt% modified silicon oxide, 0.2wt% boron trioxide and 2.8wt% soft carbon coated outside. The specific preparation process is as follows: Diboron trioxide and modified silicon oxide are mixed mechanically in the above ratio to obtain the primary product, and then the primary product is placed in a high-temperature rotary furnace under an argon atmosphere to raise the temperature to 1100°C, and the volume ratio is 1:1 Introduce a mixed gas of methane and propylene equal to that of argon for chemical vapor deposition, keep it warm for 3 hours, turn off the gas source and cool down to obtain sample 3#. In the mixed gas, the ratio of methane and propylene is 2:1.

[0054] The preparation of the negative electrode sheet,...

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Abstract

The embodiment of the invention relates to a soft carbon-coated boron-doped silicon-based negative electrode material and a preparation method and application thereof. The silicon-based negative electrode material is a powder material, and the powder conductivity is 2.0 S / cm to 6.0 S / cm; the soft carbon-coated boron-doped silicon-based negative electrode material comprises the following components in percentage by weight: 90wt%-99.49 wt% of a silicon-based powder material, 0.01 wt%-3wt% of a doping material doped in the silicon-based powder material and 0.5 wt%-7wt% of a soft carbon material; the silicon-based powder material is specifically a powder material containing electrochemical activity and comprises one or more of a nano silicon-carbon composite material, silicon monoxide, modified silicon monoxide, doped silicon monoxide and amorphous silicon alloy; the doping material comprises one or more of titanium boride, boron nitride, boron trichloride, boric acid, diboron trioxide, sodium tetraphenylborate, sodium borohydride and sodium borate; and the soft carbon material is coated on the outer surface of the silicon-based powder material to form a coating carbon layer of the boron-doped silicon-based negative electrode material.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a soft carbon-coated boron-doped silicon-based negative electrode material, a preparation method and an application. Background technique [0002] In recent years, with the rise of portable electronic communication equipment and new energy vehicles, the research and development of high-performance and high-capacity lithium-ion batteries is imminent. Compared with traditional graphite anode materials, silicon-based anode materials have extremely high theoretical specific capacity (4200mAh / g), occupying a great market advantage. [0003] However, a series of shortcomings such as volume expansion effect and poor conductivity of silicon-based anode materials limit their practical applications. At the same time, the poor intrinsic conductivity of the silicon-based material itself limits the diffusion rate of lithium ions, which affects the charge and discharge rate of the...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 潘明军刘柏男罗飞
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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