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Lithium secondary cell

A technology for lithium secondary batteries and battery components, which is applied in the directions of secondary batteries, battery electrodes, battery pack components, etc., can solve problems such as hindering the practical application of lithium secondary batteries.

Inactive Publication Date: 2006-07-05
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a lithium-nickel composite oxide is used, the above-mentioned increase in internal pressure tends to be more significant than that of other lithium transition metal oxides.
Therefore, the actual situation is that this problem hinders the practical application of lithium secondary batteries using lithium-nickel composite oxides as positive electrode active materials.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0245] Hereinafter, the present invention will be described in more detail using examples. However, the present invention is not limited by the following examples, and can be implemented with appropriate changes as long as the gist of the present invention is not changed. In addition, the part in a composition is a weight part.

[0246] A. The type of sulfur compound and the effect of adding it.

reference example 1

[0248] A lithium secondary battery containing dimethyl sulfoxide in the electrolyte was fabricated as described below.

[0249] (production of positive electrode)

[0250] The positive electrode paint was formulated with the following composition. In the lithium nickel composite oxide (LiNi 0.82 co 0.15 Al 0.03 o 2 ) after synthesis, pulverization, grading and preparation to a specific surface area of ​​0.38m 2 / g of composite oxides. In addition, lithium cobalt composite oxide (LiCoO 2 ) using a specific surface area of ​​0.50m 2 / g of composite oxides.

[0251] The composition of the positive electrode coating:

[0252] Lithium cobalt composite oxide (LiCoO 2 ) 27 parts by weight

[0253] LiNi 0.82 co 0.15 Al 0.03 o 2 63 parts by weight

[0254] Acetylene black 5 parts by weight

[0255] 5 parts by weight of polyvinylidene-1,1-difluoride

[0256] 80 parts by weight of N-methyl-2-pyrrolidone

[0257] The above raw materials were kneaded for 2 hours with...

Embodiment 1

[0287] A lithium secondary battery was produced in the same manner as in Reference Example 1, except that tetramethylene sulfoxide was used instead of dimethyl sulfoxide in the composition of the electrolyte-forming coating material of Reference Example 1. The obtained lithium secondary batteries were subjected to "expansion test 1 of lithium secondary batteries during high-temperature storage" and "measurement of initial battery capacity". The evaluation results are shown in Table 3.

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Abstract

A stable high-performance lithium secondary cell having a variable-shape case in which a cell element is contained and not bulging even though the shape of the case is variable and even if it is stored at high temperature. The lithium secondary cell comprising a cell element that includes a positive electrode, a negative electrode, and an electrolyte containing a nonaqueous solvent and a solute, and a variable-shape case containing the cell element is characterized in that DEadd(AN) is smaller than DEsol(AN) where DEsol(AN) is the difference Esol(A) - Esol(N) where Esol(N) is the enthalpy of the neutral molecular of the nonaqueous solvent determined by a predetermined calculation method and Esol(A) is the enthalpy of the anion radical produced by giving the neutral molecular one electron, and where DEadd(AN) is the difference Eadd(A) - Eadd(N) where Eadd(N) is the enthalpy of the neutral molecular of an additive [alpha] contained in the cell element determined by a predetermined calculation method and Eadd(A) is the enthalpy of the anion radical produced by giving the neutral molecular one electron.

Description

technical field [0001] The present invention relates to a lithium secondary battery (in this specification, sometimes simply referred to as a battery), and more specifically, to a lithium secondary battery that is highly safe even when stored at a high temperature. Background technique [0002] A lithium secondary battery is known in which a cell element having a positive electrode, a negative electrode, and an electrolyte containing a nonaqueous solvent and a solute is sealed in a case. [0003] The most common lithium secondary battery uses a rigid metal case made of metal such as SUS (stainless steel) as an outer case. [0004] In recent years, instead of lithium secondary batteries using such a metal case, lithium secondary batteries using a shape-variable outer packaging material such as a laminate film provided with a resin layer on both sides of a barrier layer as a case have been put into practical use. Compared with the metal case, the shape-variable outer packagin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/58H01M4/62H01M4/02H01M2/02H01M50/102
CPCY02E60/122Y02E60/10
Inventor 关敬一小林光治斋藤宏之山本昌树
Owner MITSUBISHI CHEM CORP
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