Hybrid Liquid Cathode Battery for Wide Temperature Operation
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Solution Overview
Problem
Existing liquid cathode cells with lithium anodes are limited to temperatures below 180°C due to lithium's melting point, leading to safety issues and reduced performance at high temperatures, while calcium anode cells face clogging and low discharge voltage challenges.
Innovation Solution
A liquid cathode cell with a hybrid cathode structure comprising a highly porous carbon matrix of entangled carbon fibers and a composite material with carbon black, allowing efficient operation from -40°C to 300°C by preventing CaCl2 clogging and maintaining discharge voltage above 2.5V.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium anode is used, then high discharge voltage and good low-temperature performance are achieved, but safety issues and reduced performance occur at high temperatures above 180°C
Solution Approach 1:
The patent changes the anode material from lithium to calcium, fundamentally altering the chemical and physical parameters of the battery system. Calcium has a melting point of 842°C compared to lithium's 180°C, enabling safe operation at high temperatures while maintaining electrochemical functionality through calcium's divalent ion characteristics.
Solution Approach 2:
The patent employs a hybrid cathode structure combining two distinct carbon matrix types: a porous carbon matrix for high-temperature operation and a carbon black composite material for low-temperature performance. This composite approach allows the battery to leverage the advantages of both materials across different temperature conditions.
2Temperature
If calcium anode is used, then high-temperature operation is enabled, but clogging and low discharge voltage occur
Solution Approach 1:
The patent modifies the cathode structure parameters by introducing a hybrid design with optimized porosity and surface area characteristics. The porous carbon matrix provides high porosity to accommodate calcium chloride reaction products and prevent clogging, while the carbon black composite maintains sufficient surface area for electrochemical reactions, ensuring stable discharge voltage.
Solution Approach 2:
The patent utilizes a porous carbon matrix as the primary cathode structure, which provides high porosity to accommodate the precipitation of calcium chloride reaction products. This porous structure prevents clogging by allowing reaction products to be stored within the matrix voids while maintaining electrolyte flow paths for continuous electrochemical reactions.
3Adaptability or versatility
If single carbon matrix is used, then simple structure is maintained, but inability to operate efficiently across wide temperature range occurs
Solution Approach 1:
The patent changes the structural parameters of the cathode by combining two carbon-based materials with complementary properties. The porous carbon matrix dominates at high temperatures with its open structure, while the carbon black composite contributes at low temperatures with its high surface area, creating a temperature-adaptive hybrid system.
Solution Approach 2:
The patent creates a composite cathode structure combining porous carbon matrix and carbon black material, where each component serves specific temperature ranges. This composite approach enables wide temperature adaptability while maintaining a relatively simple overall architecture based on carbon-based materials.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The hybrid cathode structure enables efficient battery operation across a wide temperature range, preventing clogging and maintaining high discharge voltage, thus overcoming the limitations of previous lithium and calcium anode cells.
Implementation Method 1
a cathode comprising a porous matrix, for example, a porous matrix made of a carbonaceous material, which makes it possible to accommodate the active material of the electrode
Implementation Method 2
the liquid compound impregnating, conventionally, a cathode matrix
Implementation Method 3
a negative electrode (or anode) of metallic lithium, where the oxidation of lithium occurs according to the following reaction: Li → Li+ + e-
Implementation Method 4
a positive electrode (or cathode) generally comprising a matrix capable of trapping the liquid active compound, in this case, thionyl chloride, which is reduced according to the following reaction: 2SOCl2 + 4e- → S + SO2 + 4Cl-
Implementation Method 5
By combining the electrochemical reaction at the positive electrode and the electrochemical reaction at the negative electrode, the overall reaction (known as discharge) can be schematized
Implementation Method 6
an electrolyte disposed between said negative electrode and said positive electrode, which electrolyte comprises, as solvent, chloride thionyl, salts
Data Source
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AI summary
The invention relates to a liquid cathode battery comprising: - a calcium anode; - an electrolyte comprising a sulfur and/or phosphorus oxidizing solvent and at least one salt; - a cathode comprising, as active material, a compound identical to the aforementioned oxidizing solvent; characterized in that the cathode comprises a first zone consisting of a carbon matrix comprising entangled carbon fibers having a porosity of at least 90% and a specific surface area less than or equal to 5 m2/g and comprises a second zone distinct from the first zone, said second zone consisting of a composite material comprising a binder and carbon black.