Anode Assembly Coating for Dendrite-Resistant Solid-State Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium dendrites grow through gaps in the solid electrolyte layer during repeated charging and discharging processes in all-solid-state batteries using lithium as the anode active material, leading to short circuits and reduced battery capacity.
Innovation Solution
An all-solid-state battery design incorporating a coating layer with nitrogen-containing amorphous carbon, where the nitrogen amount ranges from 0.5% to 7%, is used to improve the high-rate charge/discharge characteristics by reducing lithium diffusion resistance and minimizing irreversible reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium is used as the anode active material to increase energy density, then the energy density of the all-solid-state battery is improved, but lithium dendrites grow through gaps in the solid electrolyte layer during repeated charging and discharging, leading to short circuits and reduced battery capacity
Solution Approach 1:
A coating layer comprising nitrogen-containing amorphous carbon is introduced as an intermediary between the lithium anode and solid electrolyte. This coating layer acts as a mediator that prevents direct contact and dendrite formation while maintaining ionic conductivity, thus resolving the contradiction between using lithium for high energy density and preventing dendrite-induced short circuits.
Solution Approach 2:
The invention uses a composite coating layer made of amorphous carbon doped with nitrogen. This composite material combines the high ionic conductivity of carbon with the polarity and binding capability of nitrogen, creating a multifunctional interface that enables both high energy density operation and dendrite suppression.
2Productivity
If a coating layer with nitrogen-containing amorphous carbon is used to reduce lithium diffusion resistance, then the high-rate charge/discharge characteristics are improved, but the manufacturing complexity increases due to precise nitrogen content control requirements
Solution Approach 1:
The invention specifies a precise nitrogen content range (0.5-7 atomic %) in the amorphous carbon coating layer to optimize lithium diffusion resistance. By controlling this chemical composition parameter within a specific range, the coating achieves optimal ionic conductivity for high-rate charge/discharge while maintaining manufacturability through established doping techniques.
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 battery exhibits excellent capacity retention over multiple cycles during high-rate charging and discharging, with a ratio of the 39th cycle discharge capacity to the first cycle discharge capacity of 90% or more.
Implementation Method 1
reducing lithium diffusion resistance
Implementation Method 2
minimizing irreversible reactions
Data Source
AI summary
The present disclosure provides an all-solid-state battery using lithium or a lithium alloy as an anode active material, the all-solid-state battery including: a cathode, a solid electrolyte layer, a coating layer, and an anode current collector, wherein the coating layer comprises an amorphous carbon, wherein the amorphous carbon comprises a nitrogen-containing amorphous carbon, and wherein a nitrogen amount (atomic %) included in the coating layer ranges from 0.5% to 7%. The all-solid-state battery according to the present disclosure may exhibit excellent capacity retention over cycles during high-rate charge and discharge.