Active Material Composite Powder Coating Purity
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Solution Overview
Problem
The existing methods for manufacturing active material composite powders for all-solid-state batteries result in lithium niobate layers containing impurities, leading to increased reaction resistance at high voltage states, which degrades battery performance, and are difficult to inhibit effectively.
Innovation Solution
A method involving spraying a solution with a peroxo complex of niobium onto an active material, followed by heat treatment, mixing with a solvent that dissolves lithium nitrate but not lithium niobate, and subsequent solid-liquid separation to reduce impurities, thereby inhibiting the increase in reaction resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a solution containing lithium and peroxo complex of niobium is sprayed onto active material and heat treatment is performed, then lithium niobate coating layer is formed on the active material surface, but impurity (lithium nitrate) is contained in the coating layer causing increased reaction resistance at high voltage state
Solution Approach 1:
The patent extracts and removes the harmful impurity (lithium nitrate) from the lithium niobate coating layer by dissolving it in a solvent that selectively dissolves lithium nitrate but not lithium niobate, then separating the solution to obtain a purified coating layer that maintains its protective function without the harmful impurity
Solution Approach 2:
The patent changes the chemical composition parameters of the coating layer by controlling the heat treatment temperature (123-350°C) to form lithium niobate while minimizing impurity formation, and by using solvent treatment to selectively remove lithium nitrate based on solubility differences, thereby improving purity while maintaining coating integrity
2Reliability
If impurity in lithium niobate layer is reduced, then reaction resistance increase at high voltage is inhibited, but additional processing steps are required
Solution Approach 1:
The patent introduces a solvent as an intermediary substance that mediates between the lithium nitrate impurity and the lithium niobate coating layer. The solvent selectively dissolves the impurity while leaving the coating layer intact, enabling purification through a simple dissolution-separation process that adds minimal complexity
Solution Approach 2:
The patent utilizes the difference in solubility parameters between lithium nitrate and lithium niobate to achieve selective removal of impurity. By controlling the solvent treatment conditions, the process efficiently removes lithium nitrate while preserving the coating layer structure, making the additional processing step highly effective
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 effectively reduces the impurity content in the lithium niobate layer, preventing the increase in reaction resistance at high voltage states, thereby enhancing the battery's performance and stability.
Implementation Method 1
carrying out a heat treatment after spraying and drying
Implementation Method 2
forming a coating layer constituted from lithium niobate onto the surface of an active material
Implementation Method 3
mixing with a solvent that can dissolve lithium nitrate and does not dissolve lithium niobate included in the coating layer
Implementation Method 4
carrying out a solid-liquid separation on the mixed liquid
Implementation Method 5
filtering the obtained material to separate the obtained material into a solid and a filtrate
Implementation Method 6
drying the separated solid
Data Source
AI summary
Provided is a method for manufacturing an active material composite powder by which an active material composite powder that can inhibit increase in its reaction resistance at a high voltage state can be manufactured. The method includes: spraying a solution containing lithium and a peroxo complex of niobium to an active material, and at the same time drying the solution; carrying out a heating treatment, after the spraying and drying, for obtaining a powder including the active material and a coating layer attached to a surface of the active material; producing a mixed liquid by mixing the powder and a solvent that can dissolve lithium nitrate and does not dissolve lithium niobate included in the coating layer obtained by the heat treatment, and stirring the mixed liquid; and carrying out, after the mixing and stirring, a solid-liquid separation on the mixed liquid; and drying a solid obtained by the separation.