Device and method of forming a device
First Claim
1. A multilayer electrode comprising, in sequence, a conductive layer, a first composite electrode layer and a second composite electrode layer, each composite electrode layer comprising a particulate material suitable for use as an active material in a metal ion battery and a binder, wherein a major component of the active material of the first composite electrode layer (first major active component) is an active carbon and a major component of the active material of the second composite electrode layer (second major active component) is selected from the group consisting of silicon and tin, and whereinthe binder of the first composite electrode layer is polyvinylidene fluoride (PVDF), or a polyimide (PI), or a mixture of PVDF and PI, andthe binder of the second composite electrode layer is (i) polyacrylic acid (PAA) or a salt thereof, or (ii) carboxymethylcellulose (CMC) or a salt thereof, or (iii) styrene butadiene rubber (SBR), or (iv) a binary or tertiary mixture of two or more of (i), (ii), and (iii).
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Accused Products
Abstract
A multilayer electrode suitable for use in a secondary battery is disclosed. The major active component of one layer is different to a major active component of an adjacent layer. The use of layered electrodes improves both the capacity retention and cycle life of batteries including such layered electrodes.
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Citations
18 Claims
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1. A multilayer electrode comprising, in sequence, a conductive layer, a first composite electrode layer and a second composite electrode layer, each composite electrode layer comprising a particulate material suitable for use as an active material in a metal ion battery and a binder, wherein a major component of the active material of the first composite electrode layer (first major active component) is an active carbon and a major component of the active material of the second composite electrode layer (second major active component) is selected from the group consisting of silicon and tin, and wherein
the binder of the first composite electrode layer is polyvinylidene fluoride (PVDF), or a polyimide (PI), or a mixture of PVDF and PI, and the binder of the second composite electrode layer is (i) polyacrylic acid (PAA) or a salt thereof, or (ii) carboxymethylcellulose (CMC) or a salt thereof, or (iii) styrene butadiene rubber (SBR), or (iv) a binary or tertiary mixture of two or more of (i), (ii), and (iii).
Specification