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Battery

A battery and current collector technology, applied in dry batteries, lithium batteries, battery electrodes, etc., can solve problems such as difficult to fully improve cycle characteristics

Active Publication Date: 2004-12-01
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since each of these anode active materials varies greatly in volume, it is difficult to sufficiently improve their cycle characteristics

Method used

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example

[0054] Next, specific examples of the present invention will be described.

[0055] Examples 1-1 to 1-4

[0056] In the case of Examples 1-1 to 1-4 and Comparative Examples 1-1 to 1-3, what was formed was figure 1 and 2 The secondary battery shown in. First, 91 wt% LiNi with an average secondary particle diameter of 15 μm used as the cathode active material 0.8 co 0.19 Al 0.01 o 2 , 6 wt% of graphite used as an electronic conductor and 3 wt% of polyvinylidene fluoride used as a binder were mixed to prepare a cathode mixture, and the cathode mixture was dispersed in N-methyl-2-pyrrolidone to prepare a cathode Mix pulp. Next, this cathode mixture slurry was applied on a 20 μm thick cathode current collector 21A made of aluminum, and dried. Then, the cathode mixed slurry was compression-molded by means of roll pressing to form the outer cathode active material layer 21B and the inner cathode active material layer 21C, thereby forming the cathode 21 . After that, the cath...

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Abstract

Provided is a battery capable of obtaining superior cycle characteristics. The battery comprises a cylindrical type spirally wound body including a spirally wound laminate of a cathode and an anode with a separator in which an electrolyte solution is impregnated. The anode includes an anode current collector, an outer anode active material layer disposed on an outer winding surface of the anode current collector and an inner anode active material layer disposed on an inner winding surface of the anode current collector. The outer anode active material layer and the inner anode active material layer include Si, Sn or a compound thereof. As a capacity ratio between the outer anode active material layer and the inner anode active material layer in at least a region, assuming that the capacity of the outer anode active material layer is 1, the capacity of the inner anode active material layer facing the outer anode active material layer with the anode current collector in between is within a range of 0.6 to 0.8 inclusive.

Description

technical field [0001] The invention relates to a battery consisting of a helically wound body comprising a helically wound stack of a cathode, an anode and an electrolyte therebetween. Background technique [0002] With the development of electronic technology in recent years, small and portable electronic devices such as digital video cameras (camcorders), portable phones, and handheld computers (laptop computers) have emerged. As power sources for these electronic devices, there is an urgent need to develop small and portable secondary batteries. [0003] Previously, secondary batteries utilizing graphite materials utilizing intercalation reaction (intercalation reaction) of lithium (Li) between graphite layers, or carbon-containing materials utilizing carbon-containing materials have been developed and widely used. Role of insertion / extraction reactions of lithium in micropores of the anode active material. [0004] On the other hand, as the performance of portable ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/05H01M4/12H01M4/134H01M4/1395H01M4/38H01M4/66H01M6/10H01M10/04H01M10/052H01M10/0587H01M10/42
CPCH01M2004/027H01M10/0431H01M4/58H01M4/0471H01M10/38Y02E60/122H01M4/661H01M4/13H01M2010/4292H01M10/052H01M4/38H01M4/0421H01M4/386H01M4/387Y02E60/10Y02P70/50E02F3/965
Inventor 宫木幸夫高田智雄川瀬贤一饭嵨由纪子
Owner MURATA MFG CO LTD