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US 11,283,076 B1Granted
Lithium oxyhalide electrochemical cell with carbon monofluoride
AssigneeElectrochem Solutions, Inc.
InventorsArden P. Johnson, Yufei Wang
Life of this patent
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Abstract
The present invention relates to an oxyhalide electrochemical cell comprising an anode of a Group IA metal and a cathode of a composite material prepared from a first electrochemically active carbonaceous material and a second electrochemically non-active carbonaceous material. The cathode material of the present invention provides increased discharge capacity compared to traditional lithium oxyhalide cells. In addition, the cathode material of the present invention is chemically stable which makes it particularly useful for applications that require increased rate capability in extreme environmental conditions such as those found in oil and gas exploration.
Claims19
A primary electrochemical cell, comprising:
- a) a casing housing:
- i) an anode of lithium or a lithium alloy;
- ii) a cathode mixture comprising:
- A) a first electrochemically non-active carbonaceous material;
- B) a second electrochemically active fluorinated carbon;
- and
- C) a binder;
- D) wherein the first electrochemically non-active carbonaceous material comprises from about 5% to about 20%, by weight, of the cathode mixture, the second electrochemically active fluorinated carbon comprises from about 80% to about 95%, by weight, of the cathode mixture, and the binder constitutes the remaining weight percentage of the cathode mixture;
- and
- iii) a separator residing between the anode and the cathode mixture;
- and
- iv) a catholyte contacting the anode and the cathode mixture, wherein the catholyte comprises an inorganic depolarizer selected from the group of thionyl chloride, sulfuryl chloride, and phosphoryl chloride, and mixtures thereof,
- b) wherein, upon discharge, the electrochemical cell is configured to undergo a first reduction reaction between the catholyte and lithium ions supplied by the anode to thereby exhibit a first discharge voltage plateau in a range of about 3.4 V to about 3.6 V, and
- c) wherein the electrochemical cell is configured to undergo a second reduction reaction between lithium ions supplied by the anode and the second electrochemically active fluorinated carbon to thereby exhibit a second discharge voltage plateau at about 2.3 V.
11 more elements
A primary electrochemical cell, comprising:
- a) a casing housing:
- i) an anode of lithium or a lithium alloy;
- ii) a cathode mixture comprising:
- A) acetylene black as a first electrochemically non-active carbonaceous material;
- B) CFx as a second electrochemically active fluorinated carbon, wherein in the CFx, x ranges from about 0.5 to about 1.2;
- and
- C) a binder,
- D) wherein the acetylene black comprises from about 5% to about 20%, by weight, of the cathode mixture, the CFx comprises from about 80% to about 95%, by weight, of the cathode mixture, and the binder constitutes the remaining weight percentage of the cathode mixture;
- and
- iii) a separator residing between the anode and the cathode mixture;
- and
- iv) thionyl chloride as a catholyte contacting the anode and the cathode mixture,
- b) wherein, upon discharge, the electrochemical cell is configured to undergo a first reduction reaction between the thionyl chloride and lithium ions supplied by the anode to thereby exhibit a first discharge voltage plateau in a range of about 3.4 V to about 3.6 V, and
- c) wherein, upon cessation of the first reduction reaction, the electrochemical cell is configured to undergo a second reduction reaction between lithium ions supplied by the anode and the CFx to thereby exhibit a second discharge voltage plateau at about 2.3 V.
11 more elements
A primary electrochemical cell, comprising:
- a) a casing housing:
- i) an anode of lithium or a lithium alloy;
- ii) a cathode mixture comprising, by weight:
- A) about 10% acetylene black;
- B) about 80% CFx, wherein x ranges from about 0.5 to about 1.2;
- and
- C) about 10% PTFE binder;
- and
- iii) a separator residing between the anode and the cathode mixture;
- and
- iv) thionyl chloride as a catholyte contacting the anode and the cathode mixture,
- b) wherein, upon discharge, the electrochemical cell is configured to undergo a first reduction reaction between the thionyl chloride and lithium ions supplied by the anode to thereby exhibit a first discharge voltage plateau in a range of about 3.4 V to about 3.6 V, and
- c) wherein, upon cessation of the first reduction reaction, the electrochemical cell is configured to undergo a second reduction reaction between lithium ions supplied by the anode and the CFx to thereby exhibit a second discharge voltage plateau at about 2.3 V.
10 more elements
Dependencies are inferred from the claim text.