Method for preparing low-temperature lithium ion battery hard carbon negative electrode material

A technology for lithium ion batteries and negative electrode materials, applied in the field of lithium ion batteries, can solve the problem of too tight material microstructure, and achieve the effects of excellent electrochemical performance, simple process and low specific surface area.

Active Publication Date: 2019-12-20
扬州华达新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the excessive mechanical compression in the preparation process of the products produced by this invention, the microstructure of the material is too compact, which is not conducive to the formation of good electrical properties under low temperature conditions.

Method used

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  • Method for preparing low-temperature lithium ion battery hard carbon negative electrode material
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  • Method for preparing low-temperature lithium ion battery hard carbon negative electrode material

Examples

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Effect test

Embodiment 1

[0028] A kind of method for preparing lithium ion battery hard carbon negative electrode material of the present invention, carry out according to the following steps:

[0029] (1) Weigh 1000g block anthracite, wash it with water, dry it at 100°C for 10h in a blast drying oven, then take it out and place it in the air for cooling;

[0030] (2) After pulverizing the massive anthracite obtained in the step (1), put it into an alumina crucible, place the crucible in a high-temperature furnace, and first feed nitrogen to discharge the air in the furnace;

[0031] (3) Heat the high-temperature furnace to 1300 °C at a heating rate of 1.5 °C / min. During the heating process, adjust the gas valve to N at a ratio of 0.1:1. 2 mixed with CO 2 , forming a mixed gas, and then passing the mixed gas into the high-temperature furnace, the flow rate of the mixed gas is 100 mL / min; the pyrolysis time is 5h; and the hard carbon negative electrode material is obtained after cooling.

Embodiment 2

[0033] A kind of method for preparing lithium ion battery hard carbon negative electrode material of the present invention, carry out according to the following steps:

[0034] (1) Weigh 1000g of bulk graphite, wash it with water, dry it at 130°C for 9 hours in a blast drying oven, then take it out and place it in the air for cooling;

[0035] (2) After pulverizing the massive graphite obtained in the step (1), put it into an alumina crucible, place the crucible in a high-temperature furnace, and first feed nitrogen to discharge the air in the furnace;

[0036] (3) Heat the high-temperature furnace to 1400°C at a heating rate of 2°C / min. During the heating process, adjust the gas valve to N at a ratio of 0.08:1. 2 mixed with CO 2 , forming a mixed gas, and then passing the mixed gas into the high-temperature furnace, the flow rate of the mixed gas is 200 mL / min; the pyrolysis time is 4h; the pyrolysis time is 5h; the hard carbon negative electrode material is obtained after c...

Embodiment 3

[0038] A kind of method for preparing lithium ion battery hard carbon negative electrode material of the present invention, carry out according to the following steps:

[0039] (1) Weigh 1000g of wood, wash it with water, dry it in a blast drying oven at 160°C for 8 hours, then take it out and place it in the air for cooling;

[0040] (2) After the wood gained in the step (1) is pulverized, it is packed into an alumina crucible, the crucible is placed in a high-temperature furnace, and nitrogen gas is first introduced to discharge the air in the furnace;

[0041] (3) Heat the high-temperature furnace to 1500 °C at a heating rate of 2.5 °C / min. During the heating process, adjust the gas valve to N at a ratio of 0.06:1. 2 mixed with CO 2 , forming a mixed gas, and then passing the mixed gas into a high-temperature furnace, the flow rate of the mixed gas is 300 mL / min; the pyrolysis time is 3 h; and the hard carbon negative electrode material is obtained after cooling.

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Abstract

The invention discloses a method for preparing a low-temperature lithium ion battery hard carbon negative electrode material, relates to the field of a lithium ion battery and particularly relates toa method for preparing a lithium ion battery hard carbon negative electrode material suitable for ultralow temperature. The method is characterized in that oxygen in the material can effectively reduced, the long-range structure of a crystal is broken, so the organization structure is short-range and ordered, the long range is disordered, and the interlayer spacing is increased. By adopting the method, a carbon material is consumed due to introduction of a trace amount of CO2, the long-range ordered structure is locally destroyed, and the obtained hard carbon negative electrode material has advantages of short-range order and long-range disorder of carbon lattices, low specific surface area, high jolt ramming density and excellent electrochemical performance. The method is advantaged in that the lithium ion battery hard carbon negative electrode material has high energy density and excellent rate capability and is suitable for the low-temperature environment, the process is simple, andcost is relatively low.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing a hard carbon negative electrode material suitable for ultra-low temperature lithium ion batteries. Background technique [0002] Lithium-ion batteries have become one of the most promising energy storage technologies due to their high energy density, high operating voltage, long life, and environmental friendliness. At present, lithium-ion batteries have become the most widely commercialized energy storage devices, especially in the fields of portable electronic devices, and the development of new energy electric vehicles has greatly promoted the market demand for lithium-ion batteries. The wide application of lithium-ion batteries requires the ability to cope with various complex environments, especially low temperature conditions. With the further development of lithium-ion batteries in extreme environments such as polar expeditions and cold regions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/0525C01B32/05
CPCH01M4/583H01M4/625H01M10/0525C01B32/05Y02E60/10
Inventor 骆文彬尹华意赵竹青陈国林
Owner 扬州华达新能源有限公司
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