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A high-capacity lithium battery carbon negative electrode material and its preparation method and application

A carbon negative electrode material, carbon material technology, applied in battery electrodes, negative electrodes, active material electrodes, etc., can solve the problems of battery high rate performance deviation, electrochemical performance attenuation, poor cycle stability, etc., achieve low impedance and improve stability performance, high specific capacity effect

Active Publication Date: 2022-01-04
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these non-carbon materials generally have two major problems in practical applications: 1. Poor cycle stability: when lithium ions are intercalated into such materials, a huge volume expansion (~400%) will occur during the alloying process. Repeated insertion / deintercalation of ions will easily cause the crystal structure of the material to pulverize and agglomerate, which will eventually lead to the attenuation of electrochemical performance; 2. The high rate performance deviation of the battery: general metal oxides themselves are poor conductors of electricity, and they need to be added during the preparation of electrodes. A large number of conductive agents, when the charge and discharge current density increases, cannot form a fast transport channel for ions and electrons, and the electrochemical performance will also rapidly decay
However, the existing carbon materials obtained by sintering organic fibers have problems such as low first effect and poor stability, and their specific capacity is also lower than the theoretical value.

Method used

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  • A high-capacity lithium battery carbon negative electrode material and its preparation method and application
  • A high-capacity lithium battery carbon negative electrode material and its preparation method and application
  • A high-capacity lithium battery carbon negative electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] High-capacity conductive fiber carbon material, sample synthesis:

[0036] Weigh the aramid fiber 1414; put it into a tube furnace for pre-sintering and carbonization. Sintering temperature curve setting in an argon-protected furnace: from room temperature to 500°C at 5°C / min and maintain for 2 hours, then in an argon-protected furnace at 5°C / min to 900°C for sintering temperature and hold for 10 hours , cooled from 900°C to room temperature for 5 hours in an argon atmosphere. Carry out the process of heating up, constant temperature, and cooling according to the curve set above to prepare a high-capacity conductive fiber carbon material.

[0037]Electrical performance test:

[0038] The prepared lithium battery electrodes were measured on the Shanghai Chenhua CHI660D electrochemical workstation using cyclic voltammetry and constant current step method to measure the capacitance value, specific capacitance, energy density and power density. The scan rate of cyclic vo...

Embodiment 2

[0043] High-capacity conductive fiber carbon material, sample synthesis:

[0044] Weigh the polyester; put it into a tube furnace for pre-sintering and carbonization. Sintering temperature curve setting in an argon-protected furnace: from room temperature at 10°C / min to 600°C and maintain for 2 hours, then in an argon-protected furnace at 5°C / min to 800°C for sintering temperature and hold for 10 hours , cooled from 800° C. to room temperature over 5 hours in an argon atmosphere. Carry out the process of heating up, constant temperature, and cooling according to the curve set above to prepare a high-capacity conductive fiber carbon material. The experimental button-type lithium battery was prepared by using the obtained conductive fiber carbon material. For the preparation method and performance test method, see Example 1, and see Table 1 for the performance test data.

Embodiment 3

[0046] High-capacity conductive fiber carbon material, sample synthesis:

[0047] Weigh the vinylon; put it into a tube furnace for pre-sintering and carbonization. Temperature curve setting in the argon-protected sintering furnace: from room temperature 5°C / min to 500°C and keep it for 1 hour, then in the argon-protected furnace 10°C / min to 1100°C sintering temperature and continue to hold for 5 hours, and finally cooled from 1100°C to room temperature in 5 hours in an argon atmosphere. Carry out the process of heating up, constant temperature, and cooling according to the curve set above to prepare a high-capacity conductive fiber carbon material. The experimental button-type lithium battery was prepared by using the obtained conductive fiber carbon material. For the preparation method and performance test method, see Example 1, and see Table 1 for the performance test data.

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Abstract

The invention relates to a high-capacity lithium battery carbon negative electrode material and its preparation method and application. The lithium battery carbon negative electrode material is a conductive fiber carbon material. The preparation method includes: placing the organic fiber in a protective atmosphere, and first heating it at 300~ Pre-sintering at 800°C, then carbonizing at 500-1200°C and then cooling down to room temperature to obtain the conductive fiber carbon material; the temperature of the carbonization treatment is greater than the temperature of pre-sintering; the organic fibers are polyacrylonitrile-based fibers , viscose fiber, pitch fiber at least one, preferably at least one of spandex, polyester, vinylon, aramid, polybenzimidazole PBI fiber, polyimide PI fiber.

Description

technical field [0001] The invention relates to a lithium battery negative electrode material and its preparation method and application, in particular to a lithium battery carbon negative electrode material and its preparation method and application, belonging to the technical field of lithium ion battery electrode materials. Background technique [0002] In the early 1990s, Sony launched the first generation of commercial lithium-ion batteries (C / LiCoO 2 ) So far, the capacity of the 18650 lithium-ion battery has increased from 1200 to 2200-2600mAh, the composition and capacity of the positive electrode material have not changed much, and the increase in battery capacity is mainly due to the contribution of the negative electrode material. [0003] At this stage, commercial lithium-ion battery anode materials are mainly carbon materials, which have a high specific capacity (200-400mAh·g -1 ), the electrode potential is low (<1.0V vs Li + / Li), good cycle performance (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M10/0525C01B32/318C01B32/354
CPCH01M4/583H01M10/0525C01B32/318C01B32/354H01M2004/027Y02E60/10
Inventor 黄富强韩振毕辉居亚兰马文勤
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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