Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
55 words
A solid polymer electrolyte comprising a complex of a solid polymer and an alkali metal salt, which polymer is capable of forming donor-acceptor type bonds with alkali metal ions and is capable of conducting alkali metal ions, characterised in that the complex is associated with a mixture of more than one substituted or unsubstituted 1,3-dioxolane-2-ones.
Claim 2
Dependent Claim
55 words
A solid polymer electrolyte comprising a complex of a solid polymer and an alkali metal salt, which polymer is capable of forming donor-acceptor type bonds with alkali metal ions and is capable of conducting alkali metal ions, characterised in that the complex is associated with a mixture of more than one substituted or unsubstituted 1,3-dioxolane-2-ones.
Claim 3
Dependent Claim
17 words
A solid polymer electrolyte according to claim 1 wherein the mixture comprises ethylene carbonate and propylene carbonate.
Claim 4
Dependent Claim
21 words
A solid polymer electrolyte according to claim 1 or claim 2 wherein the solid polymer is poly(ethene oxide) or poly(propene oxide).
Claim 5
Dependent Claim
17 words
A solid polymer electrolyte according to any of the preceding claims wherein the alkali metal is lithium.
Claim 6
Dependent Claim
70 words
A solid polymer electrolyte according to claim 4 wherein the molar ratios of the constituents therein are represented by the general formula (I) below: [PEO a : [xEC : yPC] b ] n : LiX (I) where PEO represents poly(ethene oxide) EC represents ethylene carbonate PC represents propylene carbonate and each of a, b, x, y and n is finite and represents a molar quantity, and X is an anion.
Claim 7
Dependent Claim
49 words
A solid polymer electrolyte according to claim 5 wherein the molar ratios of the constituents therein are represented by the formula (II) below: [PEO : [2EC : 2PC]] ₂₀ : LiClO₄ (II) where PEO, EC and PC are defined as in claim 5 and the numbers represent molar quantities.
Claim 8
Dependent Claim
26 words
A solid polymer electrolyte according to any of the preceding claims wherein the electrolyte is in association with an electrode material to form a composite cathode.
Claim 9
Dependent Claim
17 words
A solid polymer electrolyte according to claim 7 wherein the electrode material is an insertion electrode material.
Claim 10
Dependent Claim
18 words
A solid polymer electrolyte according to claim 8 wherein the insertion electrode material is an oxide of vanadium.
Claim 11
Dependent Claim
43 words
A solid polymer electrolyte according to any of claims 1 to 6 wherein the electrolyte is the electrolyte to a solid state electrochemical cell including an alkali metal or alkali metal-based anode and a cathode according to any of claims 7 to 9.