Moving Bed Calcination for Consistent Transition Metal Lithium Oxide
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Solution Overview
Problem
Traditional high-temperature solid-phase methods for producing battery materials face issues with insufficient gas-solid contact, leading to inconsistent product quality and high energy consumption, as well as challenges in controlling temperature and preventing impurity contamination.
Innovation Solution
A method involving pretreatment of a lithium salt and transition metal compound mixture, followed by precalcination and calcination in a moving bed reactor with controlled gas flow and temperature, ensuring sufficient gas-solid contact and reducing oxygen consumption, while using ceramic liners to prevent corrosion and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional high-temperature solid-phase methods are used with continuous heating in ceramic crucibles, then production can be maintained, but gas-solid contact is insufficient leading to poor product consistency
Solution Approach 1:
The patent transforms the static heating process into a dynamic moving bed process where materials continuously move through the reactor. The moving bed reactor creates dynamic gas-solid contact, allowing atmosphere to uniformly penetrate throughout the material bed, solving the insufficient contact problem while enabling continuous large-scale production.
Solution Approach 2:
The patent introduces gas flow through the moving bed reactor to enhance gas-solid contact. By controlling gas flow rate and distribution, the atmosphere uniformly contacts the solid materials during the moving bed process, ensuring consistent product quality while maintaining high productivity.
2Manufacturing precision
If the entire furnace body is rotated by a motor to improve atmosphere contact, then gas-solid contact improves, but energy consumption increases greatly
Solution Approach 1:
The patent extracts the rotation function from the entire furnace body and applies it only to the material bed within the moving bed reactor. This localized approach achieves the desired atmosphere contact uniformity without the excessive energy consumption of rotating the entire furnace, as only the material needs to be moved, not the heavy furnace structure.
3Temperature
If high-temperature flue gas is used for heating, then temperature maintenance is achieved, but temperature control accuracy decreases and impurities contaminate the material
Solution Approach 1:
The patent introduces a ceramic liner as an intermediary between the heating source and the material. The ceramic liner acts as a thermal mediator that provides uniform heat distribution while blocking impurities from contaminating the material, thus maintaining temperature control accuracy and material purity.
Solution Approach 2:
The patent creates a controlled atmosphere environment within the moving bed reactor, using inert or purified gas flow to replace contaminated flue gas. This ensures accurate temperature control and prevents impurity contamination while maintaining the necessary high-temperature conditions for the reaction.
4Loss of energy
If high-temperature flue gas is used for thermal insulation, then heat loss is reduced, but impurities in the flue gas deteriorate material performance
Solution Approach 1:
The ceramic liner serves as a protective intermediary that enables thermal insulation without exposing the material to impurities. It allows heat retention while blocking harmful substances, thus reducing energy loss without compromising material quality.
Solution Approach 2:
The patent establishes a protected atmosphere within the reactor that provides thermal insulation through controlled gas flow rather than relying on contaminated flue gas. This maintains heat while excluding impurities that would otherwise deteriorate material performance.
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
This method enables the continuous mass production of transition metal lithium oxide with excellent electrochemical performance, achieving high initial discharge capacity and capacity retention, and significantly reducing oxygen consumption and impurity contamination.
Implementation Method 1
the gas phase and the solid phase are sufficiently contacted
Implementation Method 2
calcining, to obtain a transition metal lithium oxide
Implementation Method 3
several radiation heating elements are disposed in the inner chamber
Implementation Method 4
the moving bed reactor has a ceramic inner wall surface
Implementation Method 5
the intermediate moves downward from the feed port
Data Source
AI summary
The present disclosure provides a method for preparing a transition metal lithium oxide, comprising steps of: A) mixing a lithium salt and a transition metal compound, and performing a pretreatment to obtain a precursor; wherein the pretreatment temperature is 100-300° C.; and the pretreatment time is 1-10 h; B) precalcining the precursor to obtain an intermediate; and C) continuously feeding the intermediate into a feed port of a moving bed reactor, and calcining, to obtain a transition metal lithium oxide. In the present disclosure, a pretreatment process is performed before the precalcination, and the pretreatment temperature and time are further limited, thereby solving the problem of material hardening during the calcination process of battery materials. In conjunction with using a moving bed reactor, the gas phase and the solid phase are sufficiently contacted, and at the same time the thickness of the filler is increased, the productivity is enhanced and the oxygen consumption is largely decreased at the same time. The present disclosure further provides an apparatus for preparing a transition metal lithium oxide.