Halogenated Solid-State Battery Material for Ion-Conductive Electrodes
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in achieving high ion conductivity, good deformability, and reversible redox ability due to the limitations of current cathode materials, which hinder the optimization of battery structure and reduce energy density and cycle stability.
Innovation Solution
A halogenated all-solid-state battery material with a chemical formula AxMyXzYb, where A contains Li or Na, M includes elements like Mg, Al, Si, P, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Zr, and Nb, X includes F, Cl, Br, and I, and Y includes O and/or S, is developed through a preparation method involving ball milling and annealing, enabling it to function as a positive electrode, negative electrode, and solid electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rigid oxide cathode materials are used in all-solid-state batteries, then the structural stability is improved, but the energy density and cycle stability deteriorate due to the need for large amounts of deformable solid electrolytes and side reactions
Solution Approach 1:
The patent applies multi-functionality by designing a single material that simultaneously serves as cathode material and solid electrolyte. The halogenated oxide material with formula AxMyXzYb integrates ion conduction and cathode functions, eliminating the need for separate deformable solid electrolyte components and reducing side reactions.
Solution Approach 2:
The patent merges the cathode material and solid electrolyte into a single composite material system. By combining oxide cathode materials with halogen-containing compounds to form halogenated oxides, the invention integrates the functions of both components into one material phase, improving interfacial contact and reducing interfacial side reactions.
2Productivity
If multiple deformable solid electrolytes are combined with rigid oxide cathode materials to form composite electrodes, then the ion transport capability is improved, but the energy density deteriorates due to the large proportion of non-energy-providing electrolyte materials
Solution Approach 1:
The halogenated oxide material serves dual functions as both cathode material and solid electrolyte. The material provides ion conduction pathways while simultaneously serving as the active cathode material for energy storage, eliminating the need for separate electrolyte phases and maximizing energy density.
Solution Approach 2:
The patent changes the chemical composition parameters by introducing halogen elements (F, Cl, Br, I) into the oxide cathode material structure. This compositional modification transforms the material properties to achieve both high ion conductivity and high capacity, with the halogen content parameter (x, y, z, b in AxMyXzYb) being optimized to balance ion transport and energy storage capabilities.
3Adaptability or versatility
If a multi-functional battery material is designed to serve as positive electrode, negative electrode and electrolyte, then the battery structure optimization is improved, but the manufacturing complexity increases due to the need to simultaneously satisfy high ionic conductivity, good deformability and reversible redox ability
Solution Approach 1:
The patent uses parameter changes by systematically varying the stoichiometric ratios and elemental compositions in the AxMyXzYb formula to achieve the desired balance of properties. The manufacturing process parameters such as sintering temperature, atmosphere, and duration are also optimized to produce the multi-functional material with the required characteristics.
Solution Approach 2:
The invention creates a composite material system by combining oxide cathode materials with halogen-containing compounds to form halogenated oxides. This composite approach allows the material to exhibit multiple functions including ion conduction, redox activity, and structural stability that single-phase materials cannot achieve alone.
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 material achieves ionic conductivities up to 1 mS/cm, good deformability, and reversible redox ability, enhancing energy density and rate performance by eliminating the need for additional ion conductive agents, thus optimizing the battery structure.
Implementation Method 1
The halogenated all-solid-state battery material obtained by the present disclosure not only has an ionic conductivity of up to 1 mS/cm
Implementation Method 2
a preparation method for the halogenated all-solid-state battery material, comprising the following steps: taking and mixing raw materials with a stoichiometric ratio, and then performing ball milling
Implementation Method 3
performing an annealing treatment after the ball milling; a temperature of the annealing treatment is 300-500° C., and a time of the annealing treatment is 4-6 h
Data Source
AI summary
A halogenated all-solid-state battery material and a preparation method and application thereof are provided. A general chemical formula of the halogenated all-solid-state battery material is AxMyXzYb, wherein A contains Li or Na; M contains one or more of Mg, Al, Si, P, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Zr and Nb; X contains one or more of F, Cl, Br and I; Y contains O and/or S; and wherein 1≤x≤4, 0.5≤y≤1, 3≤z≤8, and 0≤b≤3. The material has good ionic conductivity, variable valence of M cation and deformability, which enables the material to meet the various requirements as a positive electrode, a negative electrode and a solid electrolyte of an all-solid-state battery and have excellent electrochemical performance.