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A soft carbon graphite composite anode material, a preparing method and a lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor sample uniformity and processing performance

Active Publication Date: 2016-12-21
BTR NEW MATERIAL GRP CO LTD
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  • Abstract
  • Description
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Problems solved by technology

However, ordinary blending, kneading and secondary granulation processes can only achieve the purpose of physical mixing, and the uniformity and processing performance of the sample are very poor.

Method used

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  • A soft carbon graphite composite anode material, a preparing method and a lithium ion battery
  • A soft carbon graphite composite anode material, a preparing method and a lithium ion battery
  • A soft carbon graphite composite anode material, a preparing method and a lithium ion battery

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preparation example Construction

[0029] see figure 1 , the present invention provides a method for preparing a soft carbon graphite composite negative electrode material, the soft carbon graphite composite negative electrode material is mainly used in lithium-ion batteries (not shown), which includes the following steps:

[0030] Step S1, mixing natural spherical graphite and pitch, mixing evenly, heating and impregnating under preset pressure, the pitch softens and flows to fill the internal pores of natural spherical graphite, and obtains an intermediate product after cooling.

[0031] Specifically, the natural spherical graphite and powdered pitch are first weighed and mixed, and then the mixture is put into the reactor for sealing and pressure-holding heating. The internal pores of spherical graphite, after soaking for a period of time, are cooled to obtain intermediate products.

[0032] Wherein, the average particle size range of the natural spherical graphite raw material is 3-20um.

[0033] Wherein,...

Embodiment 1

[0047]Mix natural spherical graphite with an average particle size of 8.6um and powdered impregnated pitch (with a quinoline insoluble content of 0.5%) at a mass ratio of 1:1, then add it to the reactor, seal the reactor, and heat at 3°C Raise the temperature to 300°C per minute, keep the temperature constant for 2 hours, and keep the pressure at 0.2MPa, then take out the sample, and put it into the furnace for carbonization after the sample is cooled. The carbonized sample was pulverized and classified to obtain a graphite sample with an average particle size of 10.6um. The surface of the graphite sample was coated with 2% by mass of petroleum pitch by spray drying, and then carbonized at 1100 °C under a nitrogen atmosphere to obtain a composite material.

[0048] Capacity and efficiency test: The composite negative electrode material obtained in Example 1, CMC, and SBR were evenly mixed in a mass ratio of 96.5:1.5:2, then coated on the copper foil current collector, dried, a...

Embodiment 2

[0052] Mix natural spherical graphite with an average particle size of 3.5um and powdered impregnated pitch (with a quinoline insoluble content of 0.5%) at a mass ratio of 1:1, then add it to the reactor, seal the reactor, and heat at 3°C Raise the temperature to 350°C per minute, keep the temperature constant for 2 hours, and keep the pressure at 0.4MPa, then take out the sample, and put it into the furnace for carbonization after the sample is cooled. The carbonized sample was pulverized and classified to obtain a graphite sample with an average particle size of 5.8um. The surface of the graphite sample was coated with 2% by mass coal tar pitch by spray drying, and then carbonized at 1000 °C under a nitrogen and helium mixed gas atmosphere to obtain a composite material.

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Abstract

A preparing method of a soft carbon graphite composite anode material is provided. The method includes S1) a step of mixing natural spherical graphite and asphalt, heating and dipping under a preset pressure after fully mixing to allow the asphalt to be softened and to flow into and fill inner pores of the natural spherical graphite, and cooling to obtain an intermediate, and S2) a step of carbonizing the intermediate, crushing and grading to obtain the composite anode material. According to the method, the asphalt is softened at a high temperature, flows into and fills the inner pores of the graphite particles and then carbonization is performed to obtain the composite anode material with excellent cyclic performance. The method is simple in process, low in cost and high in practicality. The soft carbon graphite composite anode material prepared by the method and a lithium ion battery applying the soft carbon graphite composite anode material are also provided.

Description

technical field [0001] The invention belongs to the technical field of negative electrode material preparation, and in particular relates to a soft carbon graphite composite negative electrode material, a preparation method and a lithium ion battery. Background technique [0002] With the demand for production and the improvement of environmental protection awareness, new energy has become the focus of development in various countries. Among them, the development of lithium battery is particularly rapid, and its application involves 3C products, power devices, energy storage equipment and other fields. Due to the vigorous development of new energy vehicles, the demand for power batteries is increasing. The basis of power batteries is negative electrode materials with excellent charge and discharge performance. At present, the commercial negative electrode material is mainly graphite negative electrode, but during the lithium-deintercalation cycle of graphite, the lattice exp...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393H01M4/583H01M4/62H01M10/0525
CPCH01M4/133H01M4/1393H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 周海辉付健王祥瑞岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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