All-solid-state lithium battery with both-side coated electrodes
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Solution Overview
Problem
Current all-solid-state lithium secondary batteries face challenges in maximizing energy density and minimizing electrode thickness, while also addressing safety concerns related to lithium electrodeposition and overpotential, particularly due to the limitations of single-side coated electrodes and the use of combustible organic solvents.
Innovation Solution
The battery design incorporates electrode active materials on both sides of the electrodes, with a capacity ratio of positive to negative electrodes ranging from 1.0 to 1.2 based on irreversible capacity, and connects units in series and parallel, utilizing a solid electrolyte to enhance energy density and prevent lithium electrodeposition and overpotential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrode active materials are coated on both sides of the electrode, then energy density per volume increases and electrode thickness is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies both-side coating to electrodes, transitioning from single-side to dual-side active material deposition. This dimensional expansion of the coating approach increases the quantity of active material per electrode without proportionally increasing electrode thickness, thereby improving energy density per volume while maintaining manageable structural complexity through standardized manufacturing processes.
2Reliability
If capacity ratio of positive to negative electrode is optimized to 1.0 to 1.2, then lithium electrodeposition and over potential are prevented, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the capacity ratio parameter of positive to negative electrodes within the specific range of 1.0 to 1.2. This parameter optimization balances the electrochemical reactions between electrodes, preventing lithium electrodeposition and overpotential while establishing clear manufacturing specifications that, although requiring precision, provide quantifiable targets for quality control.
3Object-affected harmful factors
If solid electrolyte is used instead of organic solvent, then safety is improved and lithium electrodeposition is prevented, but ionic conductivity may be reduced
Solution Approach 1:
The patent employs solid electrolyte materials that combine the safety advantages of solid-state chemistry with enhanced ionic conductivity properties. By selecting and optimizing solid electrolyte compositions, the system achieves both improved safety characteristics (preventing lithium electrodeposition and eliminating combustible organic solvents) and maintained electrochemical performance through advanced material science.
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 configuration reduces electrode thickness, increases energy density per volume, and prevents lithium electrodeposition and overpotential, resulting in a stable and high-capacity battery with improved safety characteristics.
Implementation Method 1
it is charged and discharged by an intercalation or deintercalation of lithium cations reversibly to an electrode
Implementation Method 2
a cathode of the all-solid-state lithium secondary battery refers to an electrode in which lithium cations are implanted in a discharging process
Data Source
AI summary
The disclosure relates to an all-solid-state lithium secondary battery, comprising a first electrode having a first active material formed on a side; a second electrode having a side facing the first active material and having a second active material formed on both sides; and a third electrode having a side facing the other side of the second electrode and having a third active material formed on a side or both sides, wherein a capacity ratio of a positive electrode to a negative electrode (N/P ratio) of each active material formed on adjacent current collectors is 1.0 to 1.2.