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Negative electrode of lithium ion secondary battery, negative electrode paste of lithium ion secondary battery, and lithium ion secondary battery

一种二次电池、负电极的技术，应用在二次电池、电池电极、负电极等方向，能够解决电池特性退化、反应性增加、充电和放电效率降低等问题，达到良好充电-放电特性的效果

Active Publication Date: 2017-07-25
ENVISION AESC ENERGY DEVICES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because natural graphite has a higher degree of graphitization than artificial graphite, the reactivity between the edge surface of natural graphite and the electrolyte increases, and degradation of battery characteristics such as reduced charge and discharge efficiency is significant

Method used

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  • Negative electrode of lithium ion secondary battery, negative electrode paste of lithium ion secondary battery, and lithium ion secondary battery
  • Negative electrode of lithium ion secondary battery, negative electrode paste of lithium ion secondary battery, and lithium ion secondary battery
  • Negative electrode of lithium ion secondary battery, negative electrode paste of lithium ion secondary battery, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139] (Preparation of Negative Electrode Active Material)

[0140] The negative electrode active material was prepared as follows. Hereinafter, the average particle size d was measured using MT3000 (manufactured by Micotrac) 50 , and the specific surface area was obtained using Quanta Sorb (manufactured by Quantachrome Corporation) using a nitrogen adsorption method.

[0141] Use an average particle size d of 20 μm 50 and 7.0m 2 / g specific surface area of ​​natural graphite as the core material.

[0142] By simple mixing using a V mixer in the solid phase stage, 99.0 parts by mass of d 50 It is mixed with natural graphite powder having a softening temperature of 80° C. and 1.0 parts by mass of coal tar pitch powder.

[0143] The obtained mixed powder was put into a graphite crucible, and heated at 1300° C. for 1 hour under a nitrogen gas flow to obtain a negative electrode active material.

[0144] (Physical properties of negative electrode active material)

[0145] T...

Embodiment 2 to 10 and comparative example 1 to 5

[0157] Negative electrode active materials, electrodes, and batteries were prepared in the same manner as in Example 1, except that the ratio of coal tar pitch powder and the heating temperature were changed as shown in Table 1. The physical properties of each of the obtained negative electrode active materials are shown in Table 1.

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Abstract

The negative electrode of lithium ion secondary battery according to the present invention comprises: negative electrode active material and binding agent, wherein said negative electrode active material meets following requirement (A), (B) and (C): (A) graphite A powder is used as a core material, and at least a part of the surface of the graphite powder is coated with a carbon material having a lower crystallinity than the graphite powder; (B) a specific surface area measured using a nitrogen adsorption BET method is greater than or equal to 0.8 m2 / g and less than or equal to 5.3 m 2 / g; and (C) the amount of dibutyl phthalate adsorption measured according to JIS K 6217-4 is 32 cm 3 / 100 g or more and 45 cm 3 / 100 g or less.

Description

technical field [0001] The invention relates to a negative electrode of a lithium ion secondary battery, a negative electrode slurry of the lithium ion secondary battery and a lithium ion secondary battery. Background technique [0002] In recent years, lithium ion secondary batteries have been used as batteries for small devices such as notebook computers, mobile phones, electric tools, and electronic and communication equipment. In addition, lithium ion secondary batteries have recently begun to be used as batteries for large equipment such as electric vehicles and power storage in addition to small equipment. [0003] Typically, a lithium ion secondary battery includes: a positive electrode comprising a metal oxide (such as lithium-cobalt composite oxide) as an active material; a negative electrode comprising a carbon material (such as graphite) as an active material; and a lithium salt dissolved therein. electrolyte. Batteries are charged and discharged by moving lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M4/36H01M4/62
CPCH01M4/133H01M4/366H01M4/587H01M4/622H01M4/625H01M10/0525H01M2004/021Y02E60/10Y02T10/70H01M2004/027
Inventor 胁一平河野安孝太田智行
Owner ENVISION AESC ENERGY DEVICES LTD
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