Graphite negative electrode material, lithium ion battery, preparation method and application

A graphite anode and raw material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low charging capacity and poor low temperature performance

Active Publication Date: 2020-07-07
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the low charging capacity and poor low-temperature performance of the lithium-ion batter

Method used

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  • Graphite negative electrode material, lithium ion battery, preparation method and application
  • Graphite negative electrode material, lithium ion battery, preparation method and application
  • Graphite negative electrode material, lithium ion battery, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] In the crushing equipment, the calcined needle coke is crushed to obtain powder, the median particle size of the powder is controlled at 8-8.5 μm, the crushed material is shaped, and the shaped powder is mixed evenly . Under the protection of chlorine gas, the mixed powder was subjected to graphitization treatment. The graphitization temperature is 2900°C, and the graphitization time is 90h. The material after graphitization treatment is screened, and the mesh number of the screen is 250 mesh, to remove the lumps that coke quickly at high temperature during the graphitization process. Fully mix the sieved material with the binder asphalt according to the ratio of 100:3, and mix for 45 minutes, so that the asphalt is evenly distributed in the sieved material to prepare a mixture. The mixture was subjected to surface coating modification treatment, including two stages. The temperature of the first stage was 350°C and the time was 3h; the temperature of the second stage...

Embodiment 2

[0058] In the crushing equipment, the calcined needle coke is crushed to obtain powder, the median particle size of the powder is controlled at 8-8.5 μm, the crushed material is shaped, and the shaped powder is mixed evenly . Under the protection of chlorine gas, the mixed powder was subjected to graphitization treatment. The graphitization temperature is 2900°C, and the graphitization time is 90h. The material after graphitization treatment is screened, and the mesh number of the screen is 250 mesh, to remove the lumps that coke quickly at high temperature during the graphitization process. Fully mix the sieved material with the binder asphalt according to the ratio of 100:4, and mix for 45 minutes, so that the asphalt is evenly distributed in the sieved material to prepare a mixture. The mixture was subjected to surface coating modification treatment, including two stages. The temperature of the first stage was 350°C and the time was 3h; the temperature of the second stage...

Embodiment 3

[0061] In the crushing equipment, the calcined needle coke is crushed to obtain powder, the median particle size of the powder is controlled at 8-8.5 μm, the crushed material is shaped, and the shaped powder is mixed evenly . Under the protection of chlorine gas, the mixed powder was subjected to graphitization treatment. The graphitization temperature is 2900°C, and the graphitization time is 90h. The material after graphitization treatment is screened, and the mesh number of the screen is 250 mesh, to remove the lumps that coke quickly at high temperature during the graphitization process. Fully mix the sieved material with the binder asphalt according to the ratio of 100:5, and mix for 45 minutes, so that the asphalt is evenly distributed in the sieved material to prepare a mixture. The mixture was subjected to surface coating modification treatment, including two stages. The temperature of the first stage was 350°C and the time was 3h; the temperature of the second stage...

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Abstract

The invention discloses a graphite negative electrode material, a lithium ion battery, a preparation method and application. The preparation method of the material comprises the steps of (1) crushingand shaping an artificial graphite raw material to prepare powder; 2, graphitizing the powder to obtain a material A; 3, screening the material A to obtain a material B; (4) carrying out surface coating modification treatment on a mixture of the material B and a binder to obtain a material C; and (5) carbonizing the material C to obtain the product. The graphite negative electrode material disclosed by the invention has relatively high tap density and relatively high battery capacity, various characteristics interact with one another, the comprehensive advantages of the material are improved,the characteristics of high capacity and high compaction are ensured, and the high-rate performance of the material is improved; and the preparation method facilitates improvement of the low-temperature electrical performance of the graphite negative electrode material of the lithium ion battery, and is simple in process, low in production cost and suitable for industrial production.

Description

technical field [0001] The invention relates to a graphite negative electrode material, a lithium ion battery, a preparation method and an application. Background technique [0002] With its advantages of high specific energy, high working voltage, fast charging and discharging, long cycle life, safety and pollution-free, lithium-ion batteries have successfully replaced other secondary batteries and become the main energy source in the 3C market, and have greatly promoted the development of electric vehicles. The industrialization process of automobile EV and HEV, with our country's strong support in the field of new energy, a series of related subsidy policies are advancing; [0003] At present, the first obstacle facing the large-scale industrialization of pure electric vehicles is the problem of "mileage anxiety". For pure electric vehicles, the cruising range is determined by the energy density of the power battery system, so the energy density of the power system has b...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M10/0525
CPCH01M4/366H01M4/587H01M10/0525Y02E60/10
Inventor 顾凯丁晓阳李虹王旭峰杜飞兰珊张淼
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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