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Preparation method of negative electrode material of lithium-ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of poor cycle stability and rate performance, low reversible capacity of silicon negative electrode materials, structural damage, etc., and achieve good cycle. The effect of stability, low cost and short holding time

Inactive Publication Date: 2018-08-17
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Due to the influence of the volume effect (expansion rate is about 300%), the structure of the silicon electrode will be destroyed during the charging and discharging process, resulting in the peeling of the active material from the current collector, and the loss of electricity between the active material and the active material, and between the active material and the current collector. Contact, while continuously forming a new solid electrolyte layer (SEI), eventually leading to low reversible capacity, poor cycle stability and rate performance of silicon anode materials; thus limiting the use of silicon anode materials

Method used

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  • Preparation method of negative electrode material of lithium-ion battery
  • Preparation method of negative electrode material of lithium-ion battery

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Embodiment 1

[0020] The preparation method of the nanometer Co / N / C / Si composite lithium-ion battery negative electrode material described in this embodiment specifically includes the following steps:

[0021] (1) Add cobalt nitrate hexahydrate and nano-silicon powder into 250ml of methanol solution to prepare a mixed solution, then stir magnetically and disperse ultrasonically for 30 minutes to obtain dispersion A; add 2-methylimidazole into 250ml of methanol solution, and then use magnetic Stir and disperse with an ultrasonic generator for 30 minutes to obtain dispersion B.

[0022] (2) Quickly mix the dispersion A and dispersion B in step (1), age at room temperature for 24 hours, then vacuum filter, wash repeatedly with methanol for 3 times, and dry at 60°C for 12 hours to obtain a powder A composite material of matter; wherein, the molar ratio of silicon, cobalt nitrate hexahydrate, and 2-methylimidazole is 2:1:4.

[0023] (3) Take out the dried powder in step (2), heat it up to 700°C...

Embodiment 2

[0031] The preparation method of the nanometer Co / N / C / Si composite lithium-ion battery negative electrode material described in this embodiment specifically includes the following steps:

[0032] (1) Add cobalt nitrate hexahydrate and nano-silicon powder into 250ml of methanol solution to prepare a mixed solution, then stir magnetically and disperse ultrasonically for 30 minutes to obtain dispersion A; add 2-methylimidazole into 250ml of methanol solution, and then use magnetic Stir and disperse with an ultrasonic generator for 30 minutes to obtain dispersion B.

[0033] (2) Quickly mix the dispersion A and dispersion B in step (1), age at room temperature for 24 hours, then vacuum filter, wash repeatedly with methanol for 3 times, and dry at 60°C for 12 hours to obtain a powder Composite material of substance; wherein the molar ratio of silicon, cobalt nitrate hexahydrate, and 2-methylimidazole is 2:1:4.

[0034] (3) Take out the dried powder in step (2), heat it up to 700°C...

Embodiment 3

[0038] The preparation method of the nanometer Co / N / C / Si composite lithium-ion battery negative electrode material described in this embodiment specifically includes the following steps:

[0039] (1) Add cobalt nitrate hexahydrate and nano-silicon powder into 250ml of methanol solution to prepare a mixed solution, then stir magnetically and disperse ultrasonically for 30 minutes to obtain dispersion A; add 2-methylimidazole into 250ml of methanol solution, and then use magnetic Stir and disperse with an ultrasonic generator for 30 minutes to obtain dispersion B.

[0040] (2) Quickly mix the dispersion A and dispersion B in step (1), age at room temperature for 24 hours, then vacuum filter, wash repeatedly with methanol for 3 times, and dry at 60°C for 12 hours to obtain a powder Composite material of substance; wherein the molar ratio of silicon, cobalt nitrate hexahydrate, and 2-methylimidazole is 1:1:4.

[0041] (3) Take out the dried powder in step (2), heat it up to 600°C...

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Abstract

The invention discloses a preparation method of a negative electrode material of a lithium-ion battery, and belongs to the technical field of lithium-ion batteries. The preparation method comprises the following steps: adding cobalt nitrate hexahydrate, nanometer silicon powder and 2-methylimidazole into a methanol solution respectively, then stirring with a magnetic stirrer and dispersing with anultrasonic generator for 30 minutes respectively, rapidly mixing the two solutions together, stirring at room temperature for 24 hours, and performing vacuum suction filtration and drying to obtain apurple black composite material; transferring the powder into a crucible for sintering, and naturally cooling to room temperature in order to obtain Co / N / C / Si composite powder with a porous structure. The Co / N / C / Si composite powder with the porous structure prepared by the method has the advantages of small particle size, uniformity, large specific surface area, high coating property of Si and the like. In a heat treatment process, the heating rate is low and the temperature preservation time is shorter, thereby ensuring that the particles are uniform and fine without excessive structural collapse.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] Energy is the lifeblood of the development of today's society. The depletion of fossil fuels and serious environmental pollution have made the storage and application of new energy an important research focus; as an important energy storage system, lithium-ion batteries have attracted much attention in the field of new energy technology . At present, the development of new energy technologies such as electric vehicles has put forward higher requirements for lithium-ion batteries, among which energy density and power density are aspects that need special attention. The energy density of lithium-ion batteries is mainly determined by the energy density of the electrode materials. [0003] Silicon is very abundant in nature (the mass content in the earth's crust i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 张正富徐嘉辉刘警峰任艳昆范苏晓白金兰
Owner KUNMING UNIV OF SCI & TECH
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