Lithium Manganate Cathode Surface Modification for High-Temperature Cycling
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Solution Overview
Problem
Lithium manganese oxide-based cathode materials exhibit limited high-temperature adaptability and cycling performance, hindering their widespread application in energy storage batteries.
Innovation Solution
A method involving the preparation of a cathode material by mixing lithium manganate with bismuth and molybdenum-based acid salts, followed by solvent thermal reaction treatment, generates molybdenum-based acid bismuth compounds in situ on the lithium manganate surface, enhancing high-temperature and cycling performance through improved structural stability and electron mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium manganese oxide is used as cathode material, then cost is reduced and safety is improved, but high-temperature adaptability and cycling performance deteriorate
Solution Approach 1:
The patent creates a composite cathode material by growing Bi2MoO6 nanosheets on lithium manganese oxide particles. This composite structure combines the low cost and safety advantages of lithium manganese oxide with the high-temperature stability and oxidation resistance of Bi2MoO6 Aurivilius compounds, thereby improving high-temperature adaptability while maintaining safety and cost benefits
Solution Approach 2:
The Bi2MoO6 nanosheets are grown locally on the surface of lithium manganese oxide particles, creating a core-shell like structure where the inner LiMn2O4 provides safety and cost advantages while the outer Bi2MoO6 layer provides high-temperature stability. This local modification approach targets specifically the surface regions that undergo Jahn-Teller distortion at high temperatures
2Reliability
If lithium manganese oxide is used as cathode material, then cost is reduced, but cycling performance deteriorates
Solution Approach 1:
The composite structure of Bi2MoO6 nanosheets on LiMn2O4 particles addresses cycling performance degradation by providing a stable protective layer that prevents structural collapse during repeated charge-discharge cycles, while maintaining the cost advantage of using lithium manganese oxide as the base material
Solution Approach 2:
The Bi2MoO6 nanosheet layer acts as a protective buffer that preemptively prevents the lithium manganese oxide from undergoing harmful Jahn-Teller distortion and structural degradation during cycling, thereby cushioning against performance deterioration before it occurs
3Adaptability or versatility
If Bi2MoO6 nanosheets are grown on lithium manganese oxide, then high-temperature adaptability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs a hydrothermal synthesis method where Bi2MoO6 nanosheets self-assemble and grow directly on the lithium manganese oxide particles through in-situ reaction. This self-organizing process reduces the need for complex manual assembly or multiple processing steps, thereby limiting the increase in manufacturing complexity despite the advanced material structure achieved
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 modified lithium manganate cathode materials demonstrate enhanced high-temperature adaptability, cycling performance, and rate performance due to the Aurivilius compounds' oxidation resistance and unique morphology, which improves electron separation and compaction density.
Implementation Method 1
performing solvent thermal reaction treatment on the mixed solution to obtain the cathode material
Data Source
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AI summary
The present disclosure relates to the field of energy storage technologies, and particularly to an energy storage batteries and its preparation method. A method for preparing an energy storage battery, comprising: preparing a cathode material, wherein a step of preparing the cathode material comprises: preparing a mixed solution containing lithium manganate, bismuth salt, and molybdenum based acid salt, wherein the molybdenum based acid salt comprises at least one of molybdate, tungstate, and vanadate, in the mixed solution, a molar amount of bismuth ions is n1, a total molar amount of molybdate ions, tungstate ions, and vanadate ions is n2, and a molar amount of lithium manganate is n3, n1:n2: n3=(1.05 to 2.2):1:(100 to 200); performing solvent thermal reaction treatment on the mixed solution to obtain the cathode material. The technical solution of the present disclosure uses molybdenum based acid salt and bismuth salt to modify lithium manganate cathode materials, which improves the high-temperature adaptability and cycling performance of the cathode materials.