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Lithium secondary battery

A technology for lithium secondary batteries and battery casings, applied in secondary batteries, lithium storage batteries, batteries, etc., can solve problems such as increased risk, and achieve the effects of excellent safety, expansion inhibition, and good storage characteristics

Inactive Publication Date: 2013-05-08
HITACHI MAXELL ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the more the end-of-charge voltage of the lithium secondary battery is increased, the risk of being exposed to an abnormal state such as excessive high temperature in the state after charging increases, so a safety device that can sufficiently suppress this risk is also required. improve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0287]

[0288] The above-mentioned lithium-containing composite oxide A and LiCoO as other lithium-containing composite oxide 2 The mass ratio shown in Table 1 was measured and mixed for 30 minutes using a Henschel mixer to obtain a mixture. 100 parts by mass of the obtained mixture (positive electrode active material), 20 parts by mass of a solution of PVDF and P(TFE-VDF) dissolved in NMP as a binder, and an average fiber of a conductive additive were mixed using a twin-screw kneader. 1.04 parts by mass of carbon fibers with a length of 100 nm and an average fiber diameter of 10 nm were kneaded with 1.04 parts by mass of graphite, and NMP was added to adjust the viscosity to prepare a paste containing a positive electrode mixture. In addition, the usage amount of the NMP solution of PVDF and P(TFE-VDF) is such that the amount of dissolved PVDF and P(TFE-VDF) is higher than that of the lithium-containing composite oxide A and LiCoO 2 The amounts of 2.34% by mass and 0.26% ...

Embodiment 2～5、8

[0306] In addition to the above-mentioned lithium-containing composite oxide A and LiCoO in the positive electrode active material 2 The positive electrode prepared in the same manner as in Example 1, and the non-aqueous electrolytic solution prepared in the same manner as in Example 1 except that the mixing ratio was changed as shown in Table 1, except that the amount of TEPA added was as shown in Table 2. Other than that, it carried out similarly to Example 1, and produced the lithium secondary battery.

Embodiment 6

[0308] Except for using the positive electrode prepared in the same manner as in Example 1, except that the above-mentioned lithium-containing composite oxide B was used instead of the above-mentioned lithium-containing composite oxide A, and the addition amount of TEPA was changed as shown in Table 2, it was the same as in Example 1. A lithium secondary battery was produced in the same manner as in Example 1 except that the prepared non-aqueous electrolytic solution was handled in the same manner.

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Abstract

A lithium secondary battery is provided with the following components: an anode which is provided with an anode mixture layer on one surface or two surfaces of a collector, wherein the anode mixture layer comprises a lithium-containing composite oxide which comprises lithium and transition metal and at least one part of the anode mixture layer is the lithium-containing composite oxide that comprises nickel as the transition metal, and the lithium-containing composite oxide is used as an anode active material; a cathode; and a separator plate in which nonaqueous electrolyte that comprises 0.5-5wt% of halogen-substituted cyclic carbonate. At a side part of the battery housing, a breaking groove which breaks on condition that the pressure in the battery housing is larger than a threshold value in a manner of crossing with a diagonal line when viewed from the wide breadth side.

Description

technical field [0001] The present invention relates to a lithium secondary battery with high capacity and excellent safety. Background technique [0002] In recent years, with the development of portable electronic devices such as mobile phones and notebook personal computers, and the practical use of electric vehicles, secondary batteries and capacitors used as their power sources have been required to have higher performance and higher stability. In particular, lithium secondary batteries have attracted attention as batteries with high energy density, and various improvements have been made as suitable power sources for the above-mentioned devices. [0003] The positive electrode active material of the current lithium secondary battery, in consideration of the ease of manufacture and operation, mostly uses LiCoO 2 (lithium cobalt oxide). However, LiCoO 2 It is manufactured using the rare element Co (cobalt) as a raw material, so resource shortages are expected to becom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M2/12H01M10/0566H01M10/0567H01M10/052H01M10/42
CPCY02E60/122Y02T10/7011H01M4/0428H01M4/13H01M4/131H01M4/364H01M4/366H01M4/483H01M4/505H01M4/525H01M4/587H01M4/623H01M4/625H01M10/0525H01M10/0567H01M10/0569H01M2200/20H01M50/3425Y02E60/10H01M10/052H01M10/0566Y02T10/70
Inventor 阪中裕太稻叶章木部昌明中村佑介植苗圭一郎山田将之辻协志
Owner HITACHI MAXELL ENERGY LTD
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