Rechargeable, high-density electrochemical device
First Claim
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1. A rechargeable electrochemical device comprising:
- a solid-state cathode comprising;
an electrochemically active material having an electronic conductivity and an ionic conductivity, the electrochemically active material having a modified surface with enhanced lithium ion grain boundary conductivity, such that the ionic conductivity of the electrochemically active material with the modified surface is at least three times higher than an ionic conductivity of the electrochemically active material without the modified surface, whereinthe solid-state composite cathode does not include a liquid and does not include a gel, andthe modified surface is a chemically modified surface achieved with reacting the electrochemically active material with a surface modifying chemical.
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Abstract
Rechargeable, high-density electrochemical devices are disclosed. These electrochemical devices may, for example, include high energy densities that store more energy in a given, limited volume than other batteries and still show acceptable power or current rate capability without any liquid or gel-type battery components. Certain embodiments may involve, for example, low volume or mass of all of the battery components other than the cathode, while simultaneously achieving high electrochemically active mass inside the positive cathode.
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Citations
20 Claims
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1. A rechargeable electrochemical device comprising:
a solid-state cathode comprising; an electrochemically active material having an electronic conductivity and an ionic conductivity, the electrochemically active material having a modified surface with enhanced lithium ion grain boundary conductivity, such that the ionic conductivity of the electrochemically active material with the modified surface is at least three times higher than an ionic conductivity of the electrochemically active material without the modified surface, wherein the solid-state composite cathode does not include a liquid and does not include a gel, and the modified surface is a chemically modified surface achieved with reacting the electrochemically active material with a surface modifying chemical. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A rechargeable electrochemical device comprising:
a solid-state composite cathode consisting of; an electrochemically active material having an electronic conductivity and an ionic conductivity, the electrochemically active material having a modified surface such that the ionic conductivity of the electrochemically active material with the modified surface is at least three times higher than an ionic conductivity of the bulk grain of the electrochemically active material, and an electronically conducting material having an electronic conductivity at least three times higher than the electronic conductivity of the electrochemically active material in a pre-charged state. - View Dependent Claims (11, 12, 13)
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14. A rechargeable electrochemical device comprising:
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a solid-state composite cathode including; an electrochemically active material consisting essentially of LiCoO2, the electrochemically active material having an electronic conductivity and an ionic conductivity, the electrochemically active material having a mechanically modified surface having enhanced lithium ion grain boundary conductivity, such that the ionic conductivity of the electrochemically active material with the modified surface is at least three times higher than an ionic conductivity of bulk electrochemically active material without the modified surface, wherein the solid-state composite cathode does not include a liquid and does not include a gel; a negative anode; and a solid-state electrolyte sandwiched between the solid state composite cathode and the negative anode. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification