Lithium-Ion Cathode Material via Biomineralized Precursor Control
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Solution Overview
Problem
Existing methods for preparing positive electrode materials for lithium-ion batteries, such as the liquid-phase method, require high energy consumption, generate pollution, and result in materials with irregular structures and poor cycle stability.
Innovation Solution
A biomineralization method is used to prepare a precursor for the positive electrode material, which is then mixed with a lithium source and calcined to produce a material with a regular layered structure and high cycle stability, reducing energy consumption and pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the liquid-phase method is used to prepare positive electrode material, then the material has good chemical homogeneity and high purity, but the energy consumption increases and pollution is generated
Solution Approach 1:
The patent changes the preparation parameters by using a low-temperature solvothermal method (80-120°C) instead of conventional high-temperature liquid-phase methods, significantly reducing energy consumption while maintaining good chemical homogeneity and purity of the electrode material
Solution Approach 2:
The patent employs a simple aqueous solvent system that can be easily evaporated and disposed of without generating harmful pollution, replacing complex organic solvents and reducing environmental impact while maintaining material quality
2Ease of manufacture
If the solid-phase method is used to prepare positive electrode material, then the process is simple, but the material has uneven phase distribution and irregular grain shape
Solution Approach 1:
The patent segments the preparation process into two distinct stages: first forming a homogeneous precursor through solvothermal method with uniform metal ion distribution, then performing simple solid-phase sintering. This segmentation allows the complex homogenization to occur in the liquid phase while keeping the final processing simple
Solution Approach 2:
The patent performs preliminary action by pre-forming a homogeneous precursor material with uniformly distributed metal ions through the solvothermal method before the final sintering step, ensuring even phase distribution is achieved before the simple solid-phase processing begins
3Manufacturing precision
If conventional liquid-phase methods are used, then the material has narrow particle size distribution, but the electrochemical performance is affected by multiple reaction conditions
Solution Approach 1:
The patent employs self-service by using the self-assembly and controlled precipitation properties of metal ions in the solvothermal system, where the reaction conditions themselves guide the formation of uniform particles without requiring complex external control mechanisms for pH, stirring speed, or temperature variations
4Ease of manufacture
If co-precipitation method is used in industry, then the precursor can be prepared, but stirring and heating consume a lot of energy and three wastes treatment increases cost
Solution Approach 1:
The patent replaces the mechanical stirring and heating system of conventional co-precipitation with a solvothermal system where controlled heating in a sealed environment enables precursor formation without continuous mechanical agitation, significantly reducing energy consumption and eliminating the need for complex waste treatment
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 method achieves high cycle stability and improved electrochemical performance of lithium-ion batteries, with an initial discharge specific capacity of 285 mAhg−1 and a cycle stability of 95% after 200 cycles.
Implementation Method 1
A biomineralization method is used to prepare a precursor for the positive electrode material
Implementation Method 2
which has a regular layered structure
Implementation Method 3
mixed with a lithium source and calcined to produce a material with a regular layered structure
Data Source
AI summary
The present application relates to a lithium ion battery positive electrode material, and a preparation method therefor and the use thereof. The preparation method comprises the following steps: (1) preparing a mixed solution from a raw material containing metal ions, a polymer and a solvent, independently leaving same and an ammonium source to stand in the same space, and subjecting same to solid-liquid separation to obtain a precursor, and (2) mixing and calcining the precursor in step (1) and a lithium source to obtain a lithium ion battery positive electrode material.