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Preparation method of negative material for low-temperature lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of complex process, high product cost, difficult control of preparation process, etc., and achieves simple preparation method, low cost, high-rate charging. Good discharge performance

Active Publication Date: 2013-06-12
WUXI DONGHENGNEWENERGYTECHNOLOGYCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process is relatively complicated, the product cost is high, and the preparation process is difficult to control

Method used

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  • Preparation method of negative material for low-temperature lithium ion battery
  • Preparation method of negative material for low-temperature lithium ion battery
  • Preparation method of negative material for low-temperature lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Put 500g of large-grained natural graphite in a ball mill at a speed of 350 rpm, and grind for 1 hour. The natural graphite balls after ball milling are washed repeatedly, then dried, and passed through a 200-mesh sieve.

[0031] The raw material large particle graphite selected in the present invention has an average diameter of 15-70 μm, and the natural graphite after ball milling has an average particle diameter of 5-35 μm.

[0032] (2) Weigh 90g of graphite after ball milling in step (1) and 10g of soft carbon shell material, grind and mix for 2 hours, mix evenly, heat and stir at 200°C for 1 hour, cool and sieve.

[0033] The soft carbon shell material in the present invention is one or more of low-temperature asphalt, medium-temperature asphalt and high-temperature asphalt.

[0034] (3) Put the mixed modified natural graphite into the quartz boat, put it into the quartz tube, push the tube furnace with a program temperature controller to control the heating r...

Embodiment 2

[0042] (1) Put 500 g of large-grained natural graphite with an average diameter of 15-70 μm in a ball mill at a speed of 200 rpm, and grind for 3 hours. The ball-milled natural graphite balls are washed repeatedly, then dried, and passed through a 200-mesh sieve, wherein the ball-milled natural graphite has an average particle size of 5-35 μm.

[0043] (2) Weighing step (1) 200g of ball-milled graphite and 10g of soft carbon shell material were ground and mixed for 5 hours, then heated and stirred at 30°C for 2 hours, cooled and sieved.

[0044] (3) Put the mixed modified natural graphite into the quartz boat, put it into the quartz tube, push the tube furnace with a program temperature controller to control the heating rate of the system, and feed N 2 As a protective gas to prevent graphite from being oxidized by air, raise the temperature to 50°C at a rate of 6°C / min, keep it for 10 hours, then raise it to 1400°C at a rate of 30°C / min, hold it for 0.5h, and then heat it at 2...

Embodiment 3

[0051] (1) Put 500 g of large-grained natural graphite with an average diameter of 15-70 μm in a ball mill at a speed of 400 rpm, and grind for 0.5 h. The ball-milled natural graphite balls are washed repeatedly, then dried, and passed through a 200-mesh sieve, wherein the ball-milled natural graphite has an average particle size of 5-35 μm.

[0052] (2) Weighing step (1) 10g of ball-milled graphite and 10g of soft carbon shell material were ground and mixed for 1 hour, then heated and stirred at 400°C for 0.1 hour, cooled and sieved.

[0053] (3) Put the mixed modified natural graphite into the quartz boat, put it into the quartz tube, push the tube furnace with a program temperature controller to control the heating rate of the system, and feed N 2 As a protective gas to prevent graphite from being oxidized by air, raise the temperature to 500°C at a rate of 30°C / min, keep it for 0.15h, then raise it to 650°C at a rate of 2°C / min, hold it for 21h, and then heat it at 0.1°C ...

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Abstract

The invented relates to a preparation method of a negative material for a low-temperature lithium ion battery. The preparation method comprises the steps of: carrying out ball-milling and refining treatment on natural graphite by adopting a ball mill, afterwards carrying out soft carbon coating for modification, then carrying out hard carbon coating, and finally curing and carbonizing the natural graphite modified by the soft-hard carbon double-layer coating to obtain final modified natural graphite. The preparation method provided by the invention is simple and convenient, low in cost, wide in raw material sources and easy to realize the industrial production; and the prepared negative material for the low-temperature lithium ion battery is high in first charging and discharging efficiency, and good in low-temperature performance and high-rate charging and discharging performance, and can satisfy the actual needs of people.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a low-temperature lithium-ion battery negative electrode material. Background technique [0002] Known as clean energy and high-efficiency energy, lithium battery energy has been popular in the market since its successful development. Among them, lithium-ion batteries have been developing rapidly in recent years and are widely used in various industries. [0003] The reason why lithium-ion batteries can develop so rapidly is mainly due to the progress of negative electrode materials. However, with the application of lithium-ion batteries in extreme environments such as polar expeditions and aerospace, it is found that the charge-discharge efficiency and cycle performance of lithium-ion batteries have declined, especially the battery capacity has dropped sharply and cannot meet the demand. [0004] Through research, it is found that at low temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/587C01B31/00C01B32/21
CPCY02E60/10
Inventor 陈晶亮沈宇栋余爱水黄桃张晓鸿
Owner WUXI DONGHENGNEWENERGYTECHNOLOGYCO LTD
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