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Hard carbon/graphite composite negative electrode material, lithium ion battery, preparation method and application thereof

A negative electrode material, hard carbon technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor stability, poor high current charge and discharge performance, poor compatibility with electrolytes, etc., to achieve low cost and improve transmission. , Improve the effect of compaction density

Active Publication Date: 2021-07-02
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of poor compatibility between the existing graphite negative electrode material and electrolyte, poor high-current charge and discharge performance, and poor stability, thereby providing a preparation method for a hard carbon / graphite composite negative electrode material

Method used

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  • Hard carbon/graphite composite negative electrode material, lithium ion battery, preparation method and application thereof
  • Hard carbon/graphite composite negative electrode material, lithium ion battery, preparation method and application thereof

Examples

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Embodiment 1

[0048] The high-temperature petroleum asphalt (softening point is about 280°C) is pulverized by a jet mill classifier to make a powder with a volume median particle size D50 of 4 μm, and then put it into a rotary kiln, and feed air at a rate of 5 L / min. Then heat up to 260°C at a heating rate of 2°C / min and keep the temperature constant for 4 hours, then cool down to room temperature to obtain a pitch-based hard carbon precursor; the composite particle artificial graphite (D50=12 μm), the obtained hard carbon precursor, and Tween 20 are mixed according to the mass Mix at a ratio of 100:15:3, use water as a solvent and stir in a high-speed mixer to form a suspension with a solid content of 60%, then put it in a blast drying oven at 100°C for drying, and cool to room temperature to obtain hard carbon / Graphite composite material precursor; put the obtained hard carbon / graphite composite material precursor into a well-type furnace and raise the temperature to 600°C for 2 hours und...

Embodiment 2

[0050] The high-temperature petroleum asphalt (softening point is about 280°C) is pulverized by a jet mill classifier to make a powder with a volume median particle size D50 of 4 μm, and then put it into a rotary kiln, and feed air at a rate of 5 L / min. Then heat up to 260°C at a heating rate of 2°C / min and keep the temperature constant for 4 hours, then cool down to room temperature to obtain a pitch-based hard carbon precursor; the composite particle artificial graphite (D50=12 μm), the obtained hard carbon precursor, and Tween 20 are mixed according to the mass Mix at a ratio of 100:5:3, use water as a solvent and stir in a high-speed mixer to form a suspension with a solid content of 60%, then put it in a blast drying oven at 100°C for drying, and cool to room temperature to obtain hard carbon / Graphite composite material precursor; put the obtained hard carbon / graphite composite material precursor into a well-type furnace and raise the temperature to 600°C for 2 hours unde...

Embodiment 3

[0052] The high-temperature petroleum asphalt (softening point is about 280°C) is pulverized by a jet mill classifier to make a powder with a volume median particle size D50 of 4 μm, and then put it into a rotary kiln, and feed air at a rate of 5 L / min. Then heat up to 260°C at a heating rate of 2°C / min and keep the temperature constant for 4 hours, then cool down to room temperature to obtain a pitch-based hard carbon precursor; the composite particle artificial graphite (D50=12 μm), the obtained hard carbon precursor, and Tween 20 are mixed according to the mass Mix at a ratio of 100:30:3, use water as a solvent and stir in a high-speed mixer to form a suspension with a solid content of 60%, then put it in a blast drying oven at 100°C for drying, and cool to room temperature to obtain hard carbon / Graphite composite material precursor; put the obtained hard carbon / graphite composite material precursor into a well-type furnace and raise the temperature to 600°C for 2 hours und...

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Abstract

The invention discloses a preparation method of a hard carbon / graphite composite negative electrode material, which comprises the following steps: S1: performing a crosslinking reaction on a hard carbon carbon source to obtain a hard carbon precursor, wherein the hard carbon carbon source is a thermoplastic polymer compound Or non-thermoplastic polymer compound; S2: dry after mixing graphite, hard carbon precursor and additive in liquid phase; S3: pre-carbonization treatment, carbonization treatment; S4: surface coating treatment. The hard carbon / graphite composite negative electrode material prepared by the preparation method has good adaptability to electrolyte and other additives, and the lithium-ion battery prepared by using it has high capacity, good rate performance and cycle performance, and the preparation method is simple and easy to operate, and the raw materials It has wide sources and low cost, and has broad application prospects.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a hard carbon / graphite composite negative electrode material, a lithium ion battery and a preparation method and application thereof. Background technique [0002] Due to its high energy density, stable charging and discharging platform, wide operating temperature range, low self-discharge rate, long cycle life and environmental friendliness, lithium-ion secondary batteries have become key research areas in the field of new energy. object. Among them, the anode material of lithium-ion battery is a key factor affecting the performance of the battery, especially the cycle and rate performance of the battery. At present, the anode materials of lithium-ion batteries that have been commercially used are mainly natural graphite and artificial graphite (including mesocarbon microspheres). However, graphite has a high degree of crystallization, poor structural stability, and high en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 葛传长范拯华曾繁俊吴志红沈龙
Owner SHANGHAI SHANSHAN TECH CO LTD
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