US2017331148A1PendingUtilityA1
Lithium all-solid-state battery
Est. expiryJan 10, 2032(~5.5 yrs left)· nominal 20-yr term from priority
H01M 4/5815H01M 10/052H01M 2300/0068H01M 4/382H01M 10/0562H01M 10/0525H01M 4/364H01M 4/386Y02E60/10
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Claims
Abstract
An all-solid-state lithium battery, thermo-electromechanical activation of Li 2 S in sulfide based solid state electrolyte with transition metal sulfides, and electromechanical evolution of a bulk-type all-solid-state iron sulfur cathode, are disclosed. An example all-solid-state lithium battery includes a cathode having a transition metal sulfide mixed with elemental sulfur to increase electrical conductivity. In one example method of in-situ electromechanically synthesis of Pyrite (FeS 2 ) from Sulfide (FeS) and elemental sulfur (S) precursors for operation of a solid-state lithium battery, FeS+S composite electrodes are cycled at moderately elevated temperatures.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . An all-solid-state lithium secondary battery, comprising:
a cathode having a transition metal sulfide, wherein: upon full discharge, the cathode undergoes conversion reactions to form a transition metal+lithium sulfide; and upon full charge, the cathode undergoes conversion reactions to form the transition metal sulfide+lithium+electrons.
2 . The battery of claim 1 , wherein the transition metal sulfide is selected from monosulfides, disulfides, and trisulfides.
3 . The battery of claim 1 , wherein transition metal sulfide is mechanically combined.
4 . The battery of claim 1 , wherein the cathode comprises solid state electrode (SSE) particles, and a conducting additive.
5 . The battery of claim 1 , further comprising a solid state electrode (SSE) layer between the cathode and an anode.
6 . The battery of claim 1 , further comprising an anode including lithium metal, graphite, or silicon-based active materials.
7 . The battery of claim 1 , wherein the cathode is selected from FeS 2 or FeS 2 equivalent.
8 . A method of in-situ electrochemical synthesis of pyrite (FeS 2 ) from iron sulfide (FeS) and elemental sulfur (S) precursors, comprising:
cycling FeS+S composite electrodes at moderately elevated temperature; wherein charge products are described by the following equation:
Li 2-x FeS 2 0.8ortho-FeS 2 +0.2FeS 8/7 +0.175S+(2-x)Li + +(2-x)e − .
9 . The method of claim 8 , further comprising producing voltage plateaus indicative of FeS 2 in battery cells constructed with FeS+S or as an FeS 2 equivalent.
10 . The method of claim 9 , wherein the voltage plateaus become more defined upon further cycling.
11 . The method of claim 8 , wherein the moderately elevated temperature is about 60° C.
12 . The method of claim 8 , wherein initial discharge of FeS 2 proceeds in two steps:
FeS 2 +2Li + +2e − Li 2 FeS 2 (1)
Li 2 FeS 2 +2Li + +2e − 2Li 2 S+Fe 0 (2)
13 . The method of claim 12 , wherein subsequent charge and discharge cycles proceed according to the following reactions:
Fe 0 +Li 2 S Li 2 FeS 2 +2Li + +2e − (3)
Li 2 FeS 2 Li 2-x FeS 2 +xLi + +xe − (0.5<x<0.8) (4)
Li 2-x FeS 2 FeS y +(2-y)S+(2-x) Li + +(2-x)e − (5)
14 . A solid-state lithium battery, comprising:
a solid state electrolyte; and an activating agent, wherein the activating agent activates excess Li 2 S in the solid state electrolyte to realize an improved charge capacity.
15 . The battery of claim 14 , wherein solid state electrolyte is sulfide-based.
16 . The battery of claim 14 , wherein activating agent is a transition metal sulfide such as FeS, TiS 2 , FeS 2 and/or FeS 2 equivalent.
17 . The battery of claim 14 , wherein the activating agent has a highly ionic and/or electrically conductive character.
18 . The battery of claim 17 , wherein the highly ionic and electrically conductive character of the activating agent activates the solid state electrolyte.
19 . The battery of claim 18 , wherein the activating agent activates otherwise inert excess Li 2 S in the solid state electrolyte.
20 . The battery of claim 14 , wherein the improved charge capacity is realized after a single charge event at an elevated temperature.
21 . The battery of claim 20 , wherein the elevated temperature is about 60° C.
22 . The battery of claim 20 , wherein the improved charge capacity is greater than about 50%.
23 . The battery of claim 14 , wherein the sulfide based solid electrolyte is xLi 2 S-(100-x)P 2 S 5 .
24 . The battery of claim 14 , further comprising a composite electrode.
25 . The battery of claim 24 , wherein the composite electrode is 80Li 2 S-20P 2 S 5 :acetylene black.
26 . The battery of claim 24 , wherein the composite electrode is TiS 2 :80Li 2 S-20P 2 S 5 acetylene black.
27 . The battery of claim 24 , further comprising an In metal negative electrode.
28 . A method of activation of a solid-state lithium battery, comprising thermoelectrochemical activating excess Li 2 S in a solid state electrolyte to realize an improved charge capacity.
29 . The method of claim 28 , wherein the improved charge capacity is realized after a single charge event at an elevated temperature.
30 . The method of claim 29 , wherein the elevated temperature is about 60° C.
31 . The method of claim 29 , wherein the improved charge capacity is greater than about 50%.
32 . The method of claim 29 , further comprising an FeS 2 equivalent cathode.
33 . The battery of claim 1 , wherein the cathode further includes at least one of lithium sulfide and elemental sulfur prior to charging and discharging.
34 . The battery of claim 1 , wherein the lithium sulfide is at least one of a component of or mixed with the electrolyte.Join the waitlist — get patent alerts
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