Battery

一种电池、电解液的技术，应用在电池电极、锂蓄电池、二次电池等方向，能够解决增加热失控的风险、电解液氧化分解、耐氧化性差等问题

Inactive Publication Date: 2009-12-23
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to poor oxidation resistance, the electrolyte is prone to oxidative decomposition on the electrode surface when the secondary battery is overcharged
At this time, when a lithium / transition metal composite oxide is used as a positive electrode active material, the secondary battery burns due to excessive heat generation, thereby increasing the risk of so-called thermal runaway

Method used

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Effect test

no. 1 approach

[0020] figure 1 is a cross-sectional view showing the battery structure of the first embodiment of the present invention. The battery is a lithium ion secondary battery, and the capacity of the negative electrode in the battery is represented by insertion and extraction of lithium, and lithium is used as an electrode reactant.

[0021] In this secondary battery, a spirally wound electrode body 20 and a pair of insulating plates 12 and 13 are housed in a battery case 11 . The battery case 11 is an almost hollow cylinder. In the spirally wound electrode body 20 , a positive electrode 21 and a negative electrode 22 are spirally wound with a separator 23 therebetween. The battery case 11 is made of, for example, nickel (Ni)-plated iron (Fe). One end of the battery case 11 is sealed, and the other end is open. A pair of insulating plates 12 and 13 are arranged to sandwich the spirally wound electrode body 20 and extend perpendicular to the spirally wound outer peripheral surfac...

no. 2 approach

[0066] The structure, operation, and effects of the battery of the second embodiment are the same as those of the first embodiment except that the negative electrode 22 has a different structure. The battery of the second embodiment was also produced by the same procedure as that of the first embodiment.

[0067] Similar to the battery of the first embodiment, the negative electrode 22 has negative electrode active material layers 22B arranged on both sides of a negative electrode collector 22A. The anode active material layer 22B includes, for example, a material containing silicon or tin as an element as an anode active material. Specifically, the material contains a simple substance, alloy or compound of silicon, or a simple substance, alloy or compound of tin. The material may contain two or more of the above.

[0068] The anode active material layer 22B is formed using a vapor phase deposition method, a liquid phase deposition method, a spray method, a sintering method,...

no. 3 approach

[0071] The battery of the third embodiment is a lithium metal secondary battery in which the capacity of the negative electrode 22 is expressed by deposition and dissolution of lithium. The structure of the battery of the third embodiment is the same as that of the first embodiment except that the negative electrode active material layer 22B is made of lithium metal. The battery of the third embodiment is also produced by the same process as that of the first embodiment,

[0072] In secondary batteries, lithium metal is used as an anode active material. As a result, high energy density can be obtained. The negative electrode active material layer 22B may be provided at the time of assembly. However, the negative electrode active material layer 22B may not exist at the time of assembly, but may be formed by depositing lithium metal when the secondary battery is charged. The negative electrode active material layer 22B can also serve as a current collector, whereby the negati...

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Abstract

A battery capable of ensuring storage characteristics and overcharge characteristics is provided. The battery comprising a cathode, an anode, and an electrolytic solution. The cathode has a cathode current collector and a cathode active material layer provided on the cathode current collector. The cathode active material layer includes an aromatic compound having three or more benzene rings. The electrolytic solution includes at least one of an ester carbonate containing a halogen and an ester carbonate containing an unsaturated bond.

Description

technical field [0001] The present invention relates to a battery comprising a positive electrode, a negative electrode and an electrolyte. Background technique [0002] In recent years, portable electronic devices such as camera-integrated VTRs (Video Tape Recorders), cellular phones, and handheld computers have been widely used, and there is a strong need to reduce the size and weight of portable electronic devices and extend their lifespan. In response to such needs, efforts have been made to develop batteries, particularly light-weight secondary batteries with high energy density, as power sources for portable electronic devices. [0003] Among them, secondary batteries (so-called lithium ion secondary batteries) that utilize lithium insertion and extraction for charge and discharge reactions and secondary batteries that utilize lithium deposition and dissolution (so-called lithium metal secondary batteries) are extremely promising. This is because a larger energy densi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/13H01M4/62H01M10/052H01M10/0525H01M10/0569
CPCH01M10/4235H01M4/133Y02E60/122H01M4/134H01M10/0569H01M10/052H01M4/13H01M10/0525Y02E60/10H01M4/60H01M4/36H01M10/0564
Inventor 堀内博志田中健彦相马正典
Owner SONY CORP
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