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Negative electrode for lithium ion secondary cell, negative electrode slurry for lithium ion secondary cell, and lithium ion secondary cell

A secondary battery, negative electrode technology, applied in the direction of secondary batteries, battery electrodes, negative electrodes, etc., can solve the problems of battery characteristic degradation, reactivity increase, charge and discharge efficiency reduction, etc., and achieve good charge-discharge characteristics. Effect

Active Publication Date: 2015-02-04
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 for lithium ion secondary cell, negative electrode slurry for lithium ion secondary cell, and lithium ion secondary cell
  • Negative electrode for lithium ion secondary cell, negative electrode slurry for lithium ion secondary cell, and lithium ion secondary cell
  • Negative electrode for lithium ion secondary cell, negative electrode slurry for lithium ion secondary cell, and lithium ion secondary cell

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

This negative electrode for a lithium ion secondary cell comprises a negative electrode active substance and a binder, and the negative electrode active substance satisfies the following requirements (A), (B), and (C): (A) Using a graphite powder as the core, at least a portion of the surface of the graphite powder is covered by a carbon material having a lower crystallinity than the graphite powder; (B) the specific surface area according to nitrogen adsorption BET is between 0.8 m2 / g and 5.3 m2 / g; and (C) the amount of dibutyl phthalate absorbed as measured in accordance with JIS K6217-4 is between 32 cm3 / 100 g and 45 cm3 / 100 g inclusive.

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 Applications(China)
IPC IPC(8): H01M4/587H01M4/36H01M4/62
CPCY02E60/122Y02T10/7011H01M4/133H01M4/587H01M4/366H01M10/0525H01M4/623H01M4/622H01M4/625H01M2004/021Y02E60/10Y02T10/70H01M2004/027
Inventor 胁一平河野安孝太田智行
Owner ENVISION AESC ENERGY DEVICES LTD
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