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Non-aqueous electrolyte secondary battery and charging method thereof

A non-aqueous electrolyte and secondary battery technology, applied in non-aqueous electrolyte storage batteries, secondary battery charging/discharging, secondary batteries, etc., can solve problems such as capacity deterioration, reduction, and failure to show performance, and achieve improved cycle characteristics , high battery voltage, excellent cycle characteristics and thermal stability

Inactive Publication Date: 2006-08-30
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, when lithium cobaltate LiCoO with no added metal elements other than cobalt and lithium is used 2 When the fabricated positive electrode was charged and discharged at a Max potential of 4.6 V on the basis of lithium, a capacity deterioration of 5% or more relative to the initial capacity was observed even after 10 cycles of charge and discharge, and it was not possible to show that it could withstand General use performance
Moreover, using the LiCoO 2 The thermal stability of the fabricated positive electrode also decreases significantly with the increase of the charging potential.

Method used

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  • Non-aqueous electrolyte secondary battery and charging method thereof
  • Non-aqueous electrolyte secondary battery and charging method thereof

Examples

Experimental program
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Effect test

Embodiment 1～11

[0040] First, a specific method of manufacturing a non-aqueous electrolyte secondary battery common to all of Examples 1 to 11 will be described first.

[0041] [making of positive electrode]

[0042] Lithium cobaltate to which a different element was added was produced as follows. As a starting material, lithium carbonate (Li 2 CO 3 ), as the cobalt source, in the cobalt solution dissolved in the acid, add the zirconium, magnesium, aluminum solution dissolved in the acid in the same way, and then add sodium bicarbonate to make the zirconium, magnesium, aluminum co-precipitate to obtain carbonic acid Cobalt, which is obtained by thermally decomposing cobalt tetroxide (Co 3 o 4 ). After they were weighed so that the molar ratio of the lithium source and the cobalt source reached a given ratio, they were mixed with a mortar, and calcined at 850°C for 20 hours in an air atmosphere to obtain a compound containing zirconium, magnesium, and aluminum lithium cobalt oxide. This...

Embodiment 12、13 and comparative example 13、14

[0086] In addition to changing the molar ratio of lithium and cobalt to 0.98 (Comparative Example 13), 1.03 (Example 12), 1.05 (Example 13) and 1.06 (Comparative Example 14) in the above [Preparation of Positive Electrode], and The positive electrodes of Examples 12 and 13 and Comparative Examples 13 and 14 were produced in the same manner as in Example 3 (the molar ratio of lithium to cobalt = 1.00). The positive electrodes of Examples 12, 13 and Comparative Examples 13, 14, and the five positive electrodes of Example 3 were punched into 8 cm 2 , making figure 2 The simple battery 20 having the configuration shown above was evaluated as a simple battery.

[0087] [Production of positive electrode simple battery]

[0088] Simple battery 20 is made up of the measuring groove 24 of disposing positive pole 21, opposite pole 22 and diaphragm 23, the reference electrode groove 26 of disposing reference electrode 25, and capillary 27 is extended to the surface vicinity of positiv...

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Abstract

A non-aqueous electrolyte secondary battery with excellent cycle characteristics and thermal stability in which the potential of the positive electrode active material ranges from 4.4V to 4.6 V based on lithium, and-charging method therefor are provided, wherein the positive electrode active substance of a non-aqueous electrolyte secondary battery comprises a hexagonal system of lithium-containing transition metal composite oxide formed by adding zirconium, magnesium, and aluminum as foreign elements upon synthesis of lithium cobalt oxide, with zirconium content ranging from 0.01 to 1 mol %, magnesium content ranging from 0.01 to 3 mol %, and aluminum content ranging from 0.01 to 3 mol %, and an Li / Co molar ratio ranging from 1.00 to 1.05.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery in which the potential of the positive electrode active material is 4.4 to 4.6 V on the basis of lithium, and particularly relates to a hexagonal lithium cobalt oxide in which zirconium, magnesium, and aluminum are added as different elements as the positive electrode active material. A non-aqueous electrolyte secondary battery having a crystalline lithium-containing transition metal composite oxide, excellent cycle characteristics and thermal stability, and a positive electrode active material whose potential is 4.4 to 4.6 V based on lithium, and a charging method thereof. Background technique [0002] With the rapid spread of portable electronic devices, the requirements for batteries used therein have become increasingly stringent year by year. In particular, batteries that are small and thin, high-capacity, excellent in cycle characteristics, and stable in performance are r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/36H01M4/58H01M4/48H01M10/44H01M4/02H01M4/525H01M10/05H01M10/0525H01M10/0567
CPCH01M10/4235H01M10/44Y02E60/122H01M2004/028H01M4/583H01M10/0569H01M4/1391H01M4/131Y02E60/10B62M1/18B62M1/36
Inventor 宫崎晋也西田伸道
Owner SANYO ELECTRIC CO LTD
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