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Lithium ion negative electrode material and preparation method thereof and lithium ion battery

A negative electrode material, lithium ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large theoretical capacitance, good cycle performance, high energy density, etc., to improve the rate performance, increase the amount of lithium intercalation, good Effect of Magnification Performance

Pending Publication Date: 2021-03-16
YINLONG ENERGY CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a lithium ion negative electrode material, its preparation method and lithium ion battery, so as to solve the problem that the lithium ion battery made of the existing silicon-containing negative electrode material cannot meet the requirements of high energy density, large theoretical capacity and cycle performance at the same time. good waiting question

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  • Lithium ion negative electrode material and preparation method thereof and lithium ion battery
  • Lithium ion negative electrode material and preparation method thereof and lithium ion battery
  • Lithium ion negative electrode material and preparation method thereof and lithium ion battery

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preparation example Construction

[0022] As described in the background art, the existing lithium-ion batteries made of silicon-containing anode materials cannot meet the requirements of high energy density, large theoretical capacitance and good cycle performance at the same time. In order to solve the above-mentioned technical problems, the present application provides a preparation method of a lithium ion negative electrode material. The preparation method of the lithium ion negative electrode material includes: mixing conductive fibers and a silicon carbon composite material with a dispersant to form a suspension, and then mixing the suspension The liquid is spray-dried to obtain a composite; the composite is sintered to obtain a negative electrode material with a fibrous porous structure; and metal lithium is deposited on the surface of the negative electrode material to obtain a lithium ion negative electrode material.

[0023] In the above preparation method, the conductive fiber and the silicon-carbon c...

Embodiment 1

[0041] A preparation method of a lithium ion negative electrode material, comprising:

[0042] The conductive carbon nanotubes (15 nm in diameter and 200 μm in length) with a weight ratio of 1:0.3 and a silicon-carbon composite (the weight ratio of carbon to silicon in the silicon-carbon composite is 1:0.05) were dissolved in a certain amount of acetone , form a suspension; spray-dry the suspension: when the inlet temperature is 250°C, the suspension is passed through a 0.5mm nozzle and sprayed at a flow rate of 30mL / min, the outlet temperature is 150°C, and 50L / h of air is used. Atomization to obtain a composite of fibrous microporous structure.

[0043] The composite with dimensional microporous structure was sintered in a tube furnace, sintered at 1000 °C for 15 h, and then cooled naturally with the furnace to obtain a negative electrode material with a fibrous porous structure. In the negative electrode material of the fibrous porous structure, the pore size of macropores...

Embodiment 2

[0047] A preparation method of a lithium ion negative electrode material, comprising:

[0048] The conductive carbon nanotubes with a weight ratio of 1:0.5 (15 nm in diameter and 200 μm in length) and silicon-carbon composites (the weight ratio of carbon to silicon in the silicon-carbon composites are 1:0.05) were dissolved in a certain amount of acetone , form a suspension; spray-dry the suspension: at an inlet temperature of 250°C, pass the suspension through a 0.5mm nozzle and spray it at a flow rate of 30ml / min, at an outlet temperature of 150°C, use 50L / h of air Atomization to obtain a composite of fibrous microporous structure.

[0049] The composite with dimensional microporous structure was sintered in a tube furnace, sintered at 1000 °C for 15 h, and then cooled naturally with the furnace to obtain a negative electrode material with a fibrous porous structure. In the negative electrode material with fibrous porous structure, the pore size of macropores is 50-100 nm, ...

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Abstract

The invention provides a lithium ion negative electrode material and a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: mixing conductive fibers, a silicon-carbon composite material and a dispersing agent to form a suspension, and performing spray drying on the suspension to obtain a compound; sintering the compound to obtain a negative electrode material with a fibrous porous structure; and depositing metal lithium on the surface of the negative electrode material to obtain a lithium ion negative electrode material. According to the invention, the fiber porous structure negative electrode material prepared by the method can improve the conductivity among particles and accelerate the transmission speed of ions so as to improve therate capability of the lithium ion battery negative electrode material; the porous structure can contain more lithium ions in the lithium intercalation and deintercalation process, so that the lithiumintercalation amount of the negative electrode can be increased, and the electric capacity of the lithium ion battery is improved; and under the action of the two reasons, the lithium ion battery negative electrode material prepared by the method not only has relatively high capacitance, but also has relatively good rate capability.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a lithium ion negative electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] In the negative electrode material of lithium ion battery, the theoretical capacity of graphite is 372mAh / g when it is used as negative electrode, and the theoretical capacity when silicon is used as negative electrode is 4200mAh / g. Although the theoretical capacitance of silicon is large, due to the volume expansion of silicon in the process of intercalation and deintercalation of lithium ions, stress and cracks are generated in the material itself, and even material pulverization occurs, resulting in intensified irreversible reactions between the lithium ion negative electrode interface and the electrolyte. . At present, while improving the energy density of lithium-ion batteries, most of the silicon-carbon composite materials are pre...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 邓赛君徐德雷程阿鸿赵微李海军蔡惠群
Owner YINLONG ENERGY CO LTD
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