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Graphite negative electrode material of lithium-ion battery and preparation method of graphite negative electrode material

A lithium-ion battery, graphite anode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large irreversible capacity of the first charge and discharge of the battery, large specific surface area of ​​modified materials, low first efficiency, etc., and achieve the first irreversible Effects of small capacity, high discharge capacity and first-time efficiency, and long cycle life

Inactive Publication Date: 2017-03-08
SHANGHAI SHANSHAN TECH CO LTD
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of lithium-ion battery graphite negative electrode material and the lithium-ion battery graphite negative electrode material prepared therefrom, to overcome the partial surface area of ​​the modified material in the existing modified natural graphite preparation method Large, the produced battery has a large irreversible capacity for the first charge and discharge, low initial efficiency, poor cycle and other defects

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  • Graphite negative electrode material of lithium-ion battery and preparation method of graphite negative electrode material
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  • Graphite negative electrode material of lithium-ion battery and preparation method of graphite negative electrode material

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Embodiment 1

[0029] Weigh 19.2Kg of the main raw material A spherical natural graphite, the particle size D50 is 16.2μm, the carbon content is 99.98%, and the tap density is 1.04g / cm 3 , specific surface area 6.9m 2 / g; Weigh 0.8Kg of auxiliary raw material B petroleum asphalt, the particle size D50 is 5.0μm, the softening point is 252°C, and the coking value is 70.2%. After the completion, vacuum carbonization treatment is carried out, the vacuum degree is -0.09MPa, and the final temperature is 1300°C. After that, the reaction product is cooled to room temperature to obtain amorphous carbon-coated natural graphite, and then sieved through a 270-mesh vibrating sieve to obtain the undersize It is graphite anode material for lithium ion battery, its particle size D50 is 16.7 microns, and its tap density is 1.10g / cm 3 , specific surface area 3.0m 2 / g; carbon content 99.97%, half-cell capacity 366.9mAh / g, initial efficiency 93.2%.

[0030] The types and amounts of each raw material in Exam...

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Abstract

The invention discloses a preparation method of a graphite negative electrode material of a lithium-ion battery. The method comprises the following steps of firstly mixing natural graphite with asphalt and carrying out surface modification treatment of natural graphite; carrying out vacuum carbonization treatment on the mixture of which the surface is modified; and finally carrying out screening treatment on the materials obtained by vacuum carbonization treatment to obtain a finished product, wherein the mass ratio of the natural graphite to the asphalt is (85:15) to (98:2) and the carbonization treatment temperature is 1,000-1800 DEG C. The graphite negative electrode material of the lithium-ion battery has high tap density, small specific surface area, high discharge capacity, high initial charge-discharge efficiency and long cycle life; the initial discharge capacity is over 360mAh / g; the initial charge-discharge efficiency is over 93%; and the cycle performance is over 90% after 500 cycles. According to the preparation method of the graphite negative electrode material of the lithium-ion battery, the process is simple and feasible, the raw material source is wide and the cost is low.

Description

technical field [0001] The invention relates to the field of lithium ion battery production, in particular to a lithium ion battery graphite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery, that is, a rechargeable battery. It mainly relies on lithium ions to move between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode and embedded in the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge, and its negative electrode material is generally graphite negative electrode material, which is a representative of modern high-performance batteries; lithium-ion batteries are characterized by their high energy density and long cycle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 张华娄文君李虹乔永民徐广敏
Owner SHANGHAI SHANSHAN TECH CO LTD
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