Composite semi-solid electrolyte and batteries comprising the same

A composite comprising:

• a support;
• and
• a layer formed on at least one side of the support, wherein the layer is formed including lithium metaphosphate (LiPO3).

A composite comprising:

• a support;
• and
• a layer formed on at least one side of the support, wherein the layer is formed including a combination of LiPO3 and PEO.

A cell comprising an anode, a cathode, and the semi-solid state electrolyte of claim 11 comprising the composite of any of the preceding claims.

Use of lithium metaphosphate (LiPO3) to improve capacity retention in a cell or battery, to reduce lithium deposition such as to reduce lithium dendrite growth, in a cell or battery, or both.

Use of LiPO3 and PEO to improve capacity retention in a cell or battery, to reduce lithium deposition such as to reduce lithium dendrite growth, in a cell or battery, or both.

A semi-solid state electrolyte comprising at least one layer including a mixture of at least one lithium-containing salt and at least one compound according to

• formula
• wherein n is an integer from 1 to 100, wherein a weight ratio of the compound according to formula (1) to the lithium-containing salt is 1:100 to 100:1, and may be 1:1 to 1:10.

Use of a mixture of at least one lithium-containing salt and at least one compound according to formula (1)

• wherein n is an integer from 1 to 100, wherein a weight ratio of the compound according to formula (1) to the lithium-containing salt is 1:100 to 100:1, and may be 1:1 to 1:10;
• to improve capacity retention in a cell or battery, to reduce lithium deposition, for example to reduce lithium dendrite growth, in a cell or battery, or both.