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Electrode and cell using the same

A battery and anode technology, which is applied in the field of electrodes, can solve the problems of sacrificial electrode volume density, discharge capacity drop, and difficulty in obtaining energy density, and achieve good charge-discharge cycle characteristics and high energy density.

Inactive Publication Date: 2006-12-27
MURATA MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the secondary battery utilizes the precipitation-dissolution reaction of lithium like the lithium secondary battery, so the secondary battery has such a problem that when the charge-discharge cycle is repeated, the discharge capacity decreases compared with the lithium ion secondary battery. a greater drop
[0009] However, in the method disclosed in Japanese Unexamined Patent Application Document No. Hei 10-270016, the liquid adsorption speed on the surface of the electrode can be increased, but it is difficult to increase the liquid adsorption speed throughout the electrode, so it is difficult to obtain sufficient characteristics
In addition, in the method disclosed in Japanese Unexamined Patent Application Document No. Hei 10-97863, the liquid adsorption rate on the electrode surface can be increased, but the volume density of the electrode is sacrificed, so it is difficult to obtain high energy density

Method used

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  • Electrode and cell using the same
  • Electrode and cell using the same
  • Electrode and cell using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1 to 1-18

[0102] Firstly, 90wt% powdered anode material capable of intercalating and extracting lithium is used as an anode active material and 10wt% polyvinylidene fluoride is used as a binder to form an anode mixture. At that time, as an anode material capable of intercalating and extracting lithium, in Examples 1-1 to 1-6, an electrode having an electrochemical equivalent of 512 mAh / cm in the intercalation reaction of lithium was used. 3 , and artificial graphite with a bulk modulus of 11.0 GPa, and the average circularity of the shadows was 0.75 in Examples 1-1 to 1-4, and 0.65 in Examples 1-5 and 1-6. Artificial graphite was obtained as follows. Artificial graphite was obtained by forming a molded body by kneading and hardening a filler, which is a graphitized coke particulate material, with a pitch binder and then graphitizing the molded body at 3000°C. Also, in Examples 1-7 to 1-10, natural graphite having a bulk modulus of 14.5 GPa and an average circularity of shade of 0.60 wa...

Embodiment 2-1 to 2-6

[0114] Such cells were formed using the same anode 22 as each of Examples 1-3, 1-4, 1-9, 1-10, 1-15 and 1-16 and Comparative Examples 1-1 to 1-6: Therein the capacity of the anode 22 is represented by the sum of the capacity component by intercalation and extraction of lithium and the capacity component by precipitation and dissolution of lithium. The battery was the same as that of Examples 1-3 except that the total thickness of the anode 22 was 120 μm.

[0115] As in the case of Examples 1-3, the secondary batteries of Examples 2-1 to 2-6 and Comparative Examples 2-1 to 2-6 were charged-discharge tested to determine the rated discharge capacity, rated energy density and discharge capacity. capacity retention. The results obtained are shown in Tables 7 to 9.

[0116] As apparent from Tables 7 to 9, in Examples 2-1 to 2-6 in which the liquid adsorption time was 100 seconds or less, the discharge capacity retention rate could be as high as 71% or more, and even if the bulk de...

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Abstract

An electrode leading to an excellent charging / discharging cycle characteristic and a high energy density, and a cell are disclosed. The cell comprises a wound electrode body (20) on which a positive electrode (21) and a negative electrode (22) are wound with an electrolyte-impregnated separator (23) interposed therebetween. Lithium metal is precipitated on the negative electrode (22) during charging. The capacity of the negative electrode (22) is expressed by the sum of the capacity component attributed to absorption / revelation of lithium and a capacity component attributed to precipitation / dissolution of lithium metal. The positive electrode (22) has a mix layer (22b) containing a powdery negative electrode active material. The mix layer (22b) exhibits a liquid absorption property that when a drop of 1 mudm<3> of propylene carbonate is made to fall at 23 DEG C, the angle of contact of the mix layer with the propylene carbonate drop becomes 10 degrees or less within 100 seconds. Thus, the electrolyte soaks in the mix layer (22b) rapidly and uniformly, and lithium metal precipitates uniformly on the whole mix layer (22b).

Description

technical field [0001] The present invention relates to a battery comprising a cathode, an anode and an electrolyte, and electrodes used in the battery. Background technique [0002] In recent years, there has been a strong pursuit to reduce the size and weight of portable electronic devices exemplified by cellular phones, PDAs (Personal Digital Assistants) or laptop computers, and as part of the reduction, there is a strong demand to increase the energy density of batteries, especially It is to improve the energy density of the secondary battery used as the power source of the device. [0003] An example of a secondary battery capable of obtaining high energy density is a lithium ion secondary battery using a material capable of inserting and extracting lithium (Li), such as a carbon material for an anode. Lithium-ion secondary batteries are designed so that the lithium intercalated into the anode material is always in an ionic state, so the energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M10/40H01M10/05H01M4/00H01M4/13H01M4/40H01M10/0566
CPCY02E60/122H01M4/02H01M10/052H01M2004/028H01M4/13H01M2004/021H01M10/0587Y02E60/10H01M4/40H01M4/58H01M10/05
Inventor 山本鉴狩野严大郎明石宽之
Owner MURATA MFG CO LTD