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Lithium secondary battery and method for producing same

A technology of lithium secondary battery and lithium quantity, which is applied in the direction of secondary battery, electrolyte storage battery manufacturing, electrode manufacturing, etc., can solve the problem of irreversible capacity reduction of positive electrode, achieve short charge and discharge cycle life, easy miniaturization, and suppress electrolyte The effect of decomposition

Inactive Publication Date: 2013-09-25
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the following technology has been disclosed in Patent Document 2: using LiNi 0.80 co 0.15 Al 0.05 o 2 As the positive electrode active material, after the battery is assembled, charge and discharge are performed at room temperature at first, and then heating charge and discharge at 45 to 60°C is repeated three times or more, thereby reducing the irreversible capacity of the positive electrode

Method used

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  • Lithium secondary battery and method for producing same
  • Lithium secondary battery and method for producing same
  • Lithium secondary battery and method for producing same

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Embodiment approach ）

[0183] Hereinafter, the configuration of the lithium secondary battery according to the embodiment of the present invention will be described with reference to the drawings. The lithium secondary battery of this embodiment contains a lithium-nickel composite oxide having substantially irreversible capacity as a positive electrode active material. The particle properties, preferred composition, and the like of the positive electrode active material are as described above. The material of the negative electrode active material is not particularly limited, but for example, carbon-based materials such as the above-mentioned graphite, SiO X and other silicon-based materials. In addition, lithium is stored in advance in the negative electrode active material. The amount of lithium stored in advance is set so that the amount of lithium that can be released in the negative electrode is greater than the irreversible capacity of the lithium secondary battery in a fully discharged stat...

Embodiment 4

[0315] Example 4 has the same configuration as Example 3 except that the packing density of the positive electrode is high. Example 4 also shows the same potential behavior as Example 3, and the increase rate of the utilization capacity caused by increasing the ambient temperature (25°C → 45°C) becomes larger than the increase rate (6%) in Example 3 . On the other hand, when the filling density of the positive electrode was reduced (Example 5), the increase rate of the utilization capacity became smaller than that of Example 3. From this result, it can be seen that the battery capacity at high temperature can be more effectively improved by controlling the packing density of the positive electrode in the range of, for example, more than 3.0 g / cm3 and less than 4.0 g / cm3.

[0316] In addition, Example 6 has the same configuration as Example 3 except that the primary particle diameter of the positive electrode is increased. Example 6 also shows the same potential behavior as E...

Embodiment 7

[0320] In Example 7 and Example 3, only the lithium pre-storage method for the silicon-based negative electrode is different. From the comparison of these evaluation results, it can be confirmed that even if the lithium pre-storage method is different, the increase rate of the utilization capacity accompanying the increase of the ambient temperature is about the same level, and the effect of achieving a high capacity at high temperature can be obtained. In addition, when vacuum evaporation is used to pre-storage lithium (Example 3), the storage and release of lithium become smooth, and the polarization of charge and discharge becomes smaller compared with the case of electrochemical storage (Example 7), and it can be obtained High cycle characteristics.

[0321] In addition, in Examples 3 to 7 using nickel-based lithium-containing composite oxides as the positive electrode active material, compared with Example 8 using cobalt-based lithium-containing composite oxides, the incr...

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Abstract

This lithium secondary battery contains: a positive electrode having a positive electrode active material capable of occluding and discharging lithium ions; a negative electrode having a negative electrode active material capable of occluding and discharging lithium ions; a separator positioned between the positive electrode and the negative electrode; and an electrolyte having lithium ion conductivity. Therein, the positive electrode active material contains a lithium nickel complex oxide having a substantially irreversible capacity, lithium is occluded in the negative electrode active material in advance, and when the lithium secondary battery is in a state of complete discharge and the ambient temperature is 25 DEG C, the amount of lithium in the negative electrode capable of being discharged is greater than the irreversible capacity of the lithium secondary battery.

Description

technical field [0001] The present invention relates to a lithium secondary battery and a manufacturing method thereof. Background technique [0002] Lithium secondary batteries have high capacity and high energy density, and are easy to miniaturize and lighten, so they are commonly used as batteries for mobile phones, portable information terminals (Personal Digital Assistants: PDA), notebook personal computers, video cameras, portable game machines, etc. Power supply for small electronic devices for portable use. In the future, there will be further demands for multi-functionalization and long-time driving of small portable electronic devices. The operating environment of the battery becomes a relatively high temperature (30 to 60° C.) due to heat generated by components when the device is driven. Therefore, performance (capacity, life) in a harsher environment than before is required. [0003] In order to achieve a higher capacity of lithium secondary batteries, the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/13H01M4/131H01M4/139H01M4/1395H01M4/525H01M10/058
CPCH01M4/0423H01M4/045H01M4/131H01M4/139H01M4/525H01M10/0525H01M10/058H01M2010/4292Y02E60/10Y10T29/49108Y02P70/50H01M4/04Y02T10/70
Inventor 武泽秀治
Owner PANASONIC CORP
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