Protective layers in lithium-ion electrochemical cells and associated electrodes and methods

An electrochemical, lithium-ion technology, applied in the field of protective layers and related electrodes and methods in lithium-ion electrochemical cells, can solve problems such as unfavorable interactions

Active Publication Date: 2017-08-18
SION POWER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the performance of Li-ion electrochemical cells can be inhibited due to un

Method used

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  • Protective layers in lithium-ion electrochemical cells and associated electrodes and methods
  • Protective layers in lithium-ion electrochemical cells and associated electrodes and methods
  • Protective layers in lithium-ion electrochemical cells and associated electrodes and methods

Examples

Experimental program
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Effect test

Embodiment 1

[0139] This example describes the fabrication and testing of an electrochemical cell comprising an anode, a cathode coated with a lithium ion conducting ceramic, and a porous separator disposed between the anode and cathode.

[0140] In the electrochemical cell, the anode was graphite and 10 μm Cu foil served as substrate and current collector. The porous separator was a 25 μm thick polyolefin layer (Celgard 2325). The cathode is lithium iron phosphate (LFP) coated on an aluminum substrate. The capacity of the cathode is about 1.21mAh / cm 2 . Lithium oxide was coated onto the LFP cathode by vacuum deposition, where an oxygen-containing gas reacted with lithium vapor. In both anode and cathode PVDF was used as binder.

[0141] The above assemblies were assembled in a single layer cell with a separator placed between the anode and cathode, and the cell assembly was placed in a foil pouch. The total active cathode surface area is 16.574cm 2 . 0.3 mL of LP30 electrolyte (44....

Embodiment 2

[0149] This example describes the fabrication and testing of an electrochemical cell comprising a sulfur oxide coated LFP cathode.

[0150] The materials and procedures given in Example 1 were used and followed except that the LFP cathode was coated with sulfur oxide instead of lithium oxide. A 0.5 μm thick oxysulfide ceramic coating was sputtered on the LFP electrodes. Figure 10 An improved discharge capacity fade rate is shown in the battery (1000) comprising the sulfur oxide coated LFP relative to the control battery of Comparative Example 1 (1020).

Embodiment 3

[0152] This example describes the fabrication and testing of an electrochemical cell comprising a lithium oxide-coated LFP cathode.

[0153] A 2 μm thick lithium oxide layer was vacuum deposited on the LFP electrode. A battery was constructed in the same manner as in Example 1 and cycled at room temperature for 5 cycles. Fully charged cells were stored at 60 °C for one week and then cycled at room temperature. Control cells with conventional LFP cathodes were constructed and cycled / stored in the same manner. Such as Figure 11 As shown, 100% self-discharge was observed from the control cell (1120) of Comparative Example 1. In the presence of a lithium oxide ceramic coating on the LFP cathode, the cell self-discharge was reduced to 56% (1100).

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Abstract

Protective layers in lithium-ion electrochemical cells, and associated electrodes and methods, are generally described. The protective layers may comprise lithium-ion-conductive inorganic ceramic materials, such as lithium oxide, lithium nitride, and/or lithium oxysulfide. The resulting lithium-ion electrochemical cells may exhibit enhanced performance, including reduced capacity fade rates and reduced self-discharge rates.

Description

technical field [0001] Protective layers and related electrodes and methods in lithium-ion electrochemical cells are generally described. Background technique [0002] A lithium-ion electrochemical cell (also sometimes called a lithium-ion battery) is a type of electrochemical cell that transports lithium ions between an anode and a cathode during charge and discharge. A typical lithium-ion electrochemical cell includes a cathode based on a lithium intercalation compound paired with a carbon-containing anode, such as graphite. In recent years, there has been considerable interest in developing high-energy-density Li-ion electrochemical cells, especially in consumer electronics, vehicles, and aerospace applications. However, the performance of lithium-ion electrochemical cells can be inhibited due to unfavorable interactions between cell components such as electrodes and electrolyte. [0003] Accordingly, improved lithium-ion electrochemical cells are desired. Contents of...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/1391H01M4/485H01M4/505H01M4/525H01M4/58H01M4/62H01M4/04H01M10/0525
CPCH01M4/131H01M4/1391H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/628H01M10/0525H01M4/0426H01M4/0428H01M4/0423H01M10/056Y02E60/10H01M4/13H01M4/62H01M4/139H01M4/133H01M4/134H01M10/44H01M4/366Y02P70/50H01M4/1393H01M10/0585H01M2300/0065
Inventor 廖朝晖查里克莱亚·斯科尔迪利斯-凯利特蕾西·厄尔·凯莱迈克尔·G·拉拉米尤里·V·米哈利克
Owner SION POWER CORP
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