LiMn2O4 Nanocomposite Cathode for Short Sintering Lithium Batteries
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Solution Overview
Problem
The solid-state method for preparing cathode active materials for lithium secondary batteries requires lengthy sintering times, leading to increased costs and poor electrochemical properties when sintering time is reduced.
Innovation Solution
A nanocomposite cathode active material is developed, comprising a core of LiMn2O4 with LiMn(PO3)3 distributed on its surface, prepared by adding phosphate to the precursor mixture, followed by wet mixing, drying, pulverization, and controlled heating and cooling, which reduces sintering time without compromising electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the sintering time is reduced to save time and cost, then the manufacturing time and cost decrease, but the electrochemical properties of the cathode active material are severely deteriorated
Solution Approach 1:
The patent changes the chemical composition parameters of the cathode active material by incorporating multiple metal elements (Co, Ni, Mn) in specific ratios along with phosphate compounds. This compositional parameter change enables the material to achieve good electrochemical properties at lower sintering temperatures and shorter sintering times, directly resolving the contradiction between reducing sintering time and maintaining electrochemical performance
Solution Approach 2:
The patent creates a composite cathode active material by combining lithium oxide complex with phosphate compounds and multiple metal oxides. This composite structure synergistically improves the material's electrochemical performance, allowing for reduced sintering time while maintaining or enhancing capacity retention and charge-discharge characteristics, thus resolving the time-quality trade-off
2Reliability
If repeated sintering and pulverization processes are used to ensure excellent electrochemical properties, then the electrochemical performance improves, but the manufacturing time and cost increase
Solution Approach 1:
The patent performs preliminary action by pre-mixing the cathode active material precursors (lithium oxide complex, phosphate compounds, and metal oxide powders) before sintering. This preliminary preparation ensures uniform distribution of components, allowing the material to achieve excellent electrochemical properties in a single sintering process without requiring repeated sintering and pulverization cycles, thereby improving manufacturing efficiency
Solution Approach 2:
The patent optimizes the chemical composition parameters of the cathode active material to achieve a structure that inherently provides good electrochemical performance. By adjusting the ratios of Co, Ni, Mn, and phosphate compounds, the material achieves high capacity retention and charge-discharge characteristics that eliminate the need for repeated processing, thus resolving the contradiction between performance quality and manufacturing productivity
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 nanocomposite material achieves superior electrochemical properties and reduces manufacturing time and cost, with improved charge-discharge characteristics and cycle performance, while eliminating the need for repeated sintering and pulverization processes.
Implementation Method 1
The present disclosure relates to a nanocomposite cathode active material for a lithium secondary battery prepared by a solid-state method with short sintering time
Data Source
AI summary
The present disclosure relates to a nanocomposite cathode active material for a lithium secondary battery, a method for preparing same, and a lithium secondary battery including same. More particularly, the present disclosure relates to a nanocomposite cathode active material for a lithium secondary battery including: a core including LiMn2O4; and LiMn(PO3)3 distributed on the surface of the core. In accordance with the present disclosure, the time and cost for manufacturing a lithium secondary battery can be reduced and the manufactured lithium secondary battery has superior electrochemical properties.