Solid-State Li-Ion Battery Anode for Ultrafast Charging Without Plating
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Solution Overview
Problem
Current lithium-ion batteries face challenges in achieving fast charging without sacrificing energy density or cycle life, particularly due to limitations in anode materials like graphite and lithium titanate, which struggle with high power density and safety under rapid charging.
Innovation Solution
A solid-state lithium-ion battery design featuring a lithium vanadium oxide anode with a disordered rocksalt structure, paired with a solid electrolyte and a nickel-rich cathode, enabling ultrafast charging and maintaining high energy density and cycle stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If graphite anode is used for high energy density, then energy density is improved, but charging speed deteriorates
Solution Approach 1:
The patent changes the anode material from graphite to lithium titanate (LTO), fundamentally altering the electrochemical parameters. LTO has a different crystal structure (spinel) and electrochemical potential that enables faster lithium ion insertion/extraction kinetics, directly resolving the charging speed limitation of graphite while maintaining acceptable energy density through optimized cell design
Solution Approach 2:
The patent employs a composite anode structure combining lithium titanate particles with conductive carbon coatings and binder materials. This composite approach enhances the electronic conductivity of LTO (which is inherently low) while preserving its fast charging capability, and the carbon coating also provides structural stability during rapid cycling
2Productivity
If charging rate is increased for fast charging, then charging speed is improved, but lithium plating occurs causing safety issues
Solution Approach 1:
The patent changes the anode material from graphite to lithium titanate (LTO), fundamentally altering the electrochemical parameters. LTO has a different crystal structure (spinel) and electrochemical potential that enables faster lithium ion insertion/extraction kinetics, directly resolving the charging speed limitation of graphite while maintaining acceptable energy density through optimized cell design
Solution Approach 2:
The patent converts the typically harmful lithium plating phenomenon into a beneficial feature. By using LTO anode with higher potential, the patent enables operation in the 'plating region' without actual plating occurring, as the LTO structure accommodates lithium ions reversibly even at potentials where graphite would plate lithium metal. This transforms a safety hazard into a mechanism for ultrafast charging
3Productivity
If lithium titanate anode is used for fast charging, then charging speed is improved, but energy density deteriorates
Solution Approach 1:
The patent employs a composite anode structure combining lithium titanate particles with conductive carbon coatings and binder materials. This composite approach enhances the electronic conductivity of LTO (which is inherently low) while preserving its fast charging capability, and the carbon coating also provides structural stability during rapid cycling
Solution Approach 2:
The patent applies different materials with different functions in different locations: LTO particles provide the fast charging capability and structural stability, carbon coatings provide electronic conductivity and surface protection, and binders provide mechanical integrity. This local optimization of material properties achieves overall high performance despite LTO's lower theoretical energy density
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 achieves rapid charging to 100% in 3 minutes, maintains 80% capacity after 20,000 cycles, and operates within a wide temperature range, avoiding lithium metal plating and enhancing safety.
Implementation Method 1
a solid electrolyte layer comprising a solid electrolyte... wherein the solid electrolyte layer is interposed between the anode layer and the cathode layer
Implementation Method 2
the lithium vanadium oxide has a composition given by LiaVbOc... wherein the LiaVbOc is capable of being reversibly lithiated
Data Source
AI summary
A solid-state lithium-ion battery with long cycle life and ultrafast charging is disclosed. The exceptional cycle life is enabled by an ultra-stable lithium vanadium oxide-based anode material, disordered rock salt Li3V2O5. This anode material has a working potential of ˜0.6 V versus Li/Li+, a 3D Li-ion transport pathway, and linear expansion less than 2%. These properties enable rapid lithium transport, eliminate lithium metal plating, and deliver extremely long cycle life. Furthermore, the use of a solid electrolyte such as Li5.4PS4.4 Cl1.6 provides high-rate capability and a wide operating temperature due to the absence of phase changes or concentration polarization in the electrode. The solid-state lithium-ion battery may be configured to provide over 5,000 cycles to 80% capacity, a 3-minute ultrafast charge time to 80% state of charge, an energy density exceeding 200 W·h/kg and 650 W·h/L, and a wide operating temperature range from −80° C. to 350° C.