Battery

Abstract

A battery capable of inhibiting swollenness of the battery is provided. A cathode and an anode are layered with a separator and an electrolyte layer in between. The anode contains an anode active material containing Sn or Si as an element. The electrolyte layer contains an electrolytic solution and a high molecular weight compound. It is preferable that the distance between the cathode and the anode is from 15 μm to 50 μm, and the distance between the cathode and the separator and the distance between the anode and the separator are respectively from 3 μm to 20 μm. Thereby, expansion of the anode is absorbed, stress on the anode is reduced, and occurrence of wrinkles in the anode is inhibited.

1 - 8 . (canceled) 
     
     
         9 . A battery comprising:
 a battery element contained in a film outer package member;   a cathode;   an anode;   a separator in between the cathode and the anode; and   a gel electrolyte layer comprising a polymer layer provided at least one of a position between the cathode and the separator and a position between the anode and the separator;
 wherein the anode comprises at least one of silicon (Si) and tin (Sn); 
 wherein the polymer layer maintains an electrolyte; 
 wherein a distance between the cathode and the anode is from about 15 μm to about 50 μm in a region where the gel electrolyte layer is provided; and 
   wherein at least one of a distance between the cathode and the separator and a distance between the anode and the separator is from about 3 μm to about 20 μm in the region where the gel electrolyte layer is provided.   
     
     
         10 . The battery according to  claim 9 , wherein the polymer layer comprises a high molecular weight compound and an electrolytic solution. 
     
     
         11 . The battery according to  9 , wherein the polymer layer comprises vinylidene fluoride. 
     
     
         12 . The battery according to  claim 9 , wherein the polymer layer comprises vinylidene fluoride and hexafluoropropylene. 
     
     
         13 . The battery according to  claim 9 , wherein the polymer layer comprises a copolymer comprising vinylidene fluoride and an other component, and a copolymerization amount of the other component is in a range from about 3 wt % to about 20 wt % of the copolymer. 
     
     
         14 . The battery according to  claim 13 , wherein the other component is hexafluoropropylene. 
     
     
         15 . The battery according to  claim 13 , wherein the copolymer comprises a first component comprising a weight-average molecular weight from about 0.5 million to about 0.8 million and a second component comprising a weight-average molecular weight from about 0.3 million to about 0.55 million. 
     
     
         16 . The battery according to  claim 15 , wherein the ratio of the second component to the first component is about 40 wt % or less. 
     
     
         17 . The battery according to  claim 9 , wherein a thickness of the separator is from about 5 um to about 35 um. 
     
     
         18 . The battery according to  claim 9 , wherein a porosity of the separator is from about 30% to about 60%. 
     
     
         19 . The battery according to  claim 9 , wherein the electrolyte comprises an electrolyte salt and a non-aqueous solvent. 
     
     
         20 . The battery according to  claim 9 , wherein the battery is a lithium ion secondary battery. 
     
     
         21 . The battery according to  claim 9 , wherein the cathode has a cathode current collector and a cathode active material layer provided on the cathode current collector, and
 the cathode current collector has an exposed section in which the cathode active material layer is not provided.   
     
     
         22 . The battery according to  claim 21 , wherein a cathode lead is attached to the exposed section of the cathode current collector. 
     
     
         23 . The battery according to  claim 9 , wherein the anode has an anode current collector and an anode active material layer provided on the anode current collector, and
 the anode current collector has an exposed section in which the anode active material layer is not provided.   
     
     
         24 . The battery according to  claim 23 , wherein an anode lead is attached to the exposed section of the anode current collector. 
     
     
         25 . The battery according to  claim 9 , wherein a thickness of the polymer layer is from about 3 um to about 21 um. 
     
     
         26 . The battery according to  claim 9 , wherein the polymer layer is provided in both of the position between the cathode and the separator and the position between the anode and the separator.