Hydrothermal Synthesis of Lithium Ion Battery Cathodes

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current manufacturing techniques for lithium-ion batteries are energy and time consuming, requiring high temperature and harsh reaction conditions for synthesizing active materials, which limits the efficiency and speed of cathode production.

Innovation Solution

A method and apparatus for continuously forming an electrochemical film on a substrate using a reactor chamber where precursors are energized to synthesize active material crystals, which are then sprayed onto a substrate to deposit a layer, utilizing a spray chamber and energy applicator to facilitate rapid and energy-efficient production.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional high temperature synthesis methods are used to produce active materials, then the active material can be synthesized with proper crystal structure, but the process requires high energy consumption and long processing time

Engineering Contradiction:

Improvecrystal structure qualityVSAvoidenergy consumption

Core Design Contradiction:

Manufacturing precisionVSUse of energy by moving object

Solution Approach 1:

The patent utilizes hydrothermal synthesis which exploits phase transitions of water between liquid and supercritical states to enable low-temperature crystallization of active materials. The autoclave system maintains elevated temperature and pressure conditions that allow water to dissolve precursors and then precipitate crystalline active materials at temperatures significantly below traditional solid-state synthesis, thereby reducing energy consumption while maintaining crystal structure quality

Inventive Principle:

Principle #36Phase transitions

Solution Approach 2:

The patent replaces traditional mechanical mixing and high-temperature thermal processing with a chemical hydrothermal system. Precursors are dissolved in aqueous solution and transformed into active materials through controlled chemical reactions in the hydrothermal environment, eliminating the need for high-energy mechanical grinding and extended high-temperature heating processes

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If traditional slurry coating methods are used to deposit active material on current collector, then the coating can be applied uniformly, but the process requires long drying time and high energy consumption

Engineering Contradiction:

Improvecoating uniformityVSAvoiddrying time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent extracts and eliminates the solvent removal step from the traditional slurry coating process. By using hydrothermal synthesis directly on the current collector, the active material is deposited as a wet slurry that is then directly transformed into crystalline material through hydrothermal treatment, bypassing the need for prolonged drying and solvent evaporation steps that consume significant energy and time

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the coating deposition step with the crystallization step into a single integrated hydrothermal process. The slurry application and subsequent crystal formation occur in sequence without intermediate drying, combining what were traditionally separate process steps into one continuous operation that reduces both time and energy requirements

Inventive Principle:

Principle #5Merging (Combining)

3Manufacturing precision

If traditional batch synthesis and deposition processes are used, then the active material can be synthesized and coated, but the production process is time consuming and not continuous

Engineering Contradiction:

Improvematerial synthesis qualityVSAvoidproduction speed

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent implements a continuous hydrothermal synthesis process where precursors are continuously fed into an autoclave, undergo continuous transformation into active materials, and are continuously deposited onto moving current collectors. This eliminates the batch-to-batch interruptions of traditional methods, maintaining continuous production flow that significantly increases productivity while preserving material synthesis quality through controlled hydrothermal conditions

Inventive Principle:

Principle #20Continuity of useful action

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 approach enables the rapid and energy-efficient production of cathodes for lithium-ion batteries by synthesizing active material crystals and depositing them as a continuous layer, reducing production time and energy consumption.

Implementation Method 1

Hydrothermal synthesis of active materials and in situ spraying deposition for lithium ion battery

Methodology Applied

Scientific EffectHydrothermal synthesis:

Implementation Method 2

spraying the active material continuously into the spray chamber to deposit a layer of the active material onto the substrate

Methodology Applied

Scientific EffectSpray deposition: Deposition (physical)

Data Source

PatentUS8967076B2Hydrothermal synthesis of active materials and in situ spraying deposition for lithium ion battery

Publication Date: 2015.03.03 ELEVATED MATERIALS US LLC

AI summary

A method and apparatus for forming an electrochemical layer of a lithium ion battery is provided. A precursor mixture in a carrying medium is activated in a reactor chamber by application of energy to synthesize active materials. The activated precursor mixture is then spray deposited on a substrate. A binder and conductive materials may be blended, or sprayed separately, with the nano- or micro-crystals as they deposit on the surface to enhance adhesion and conductivity.