Amorphous Lithium-Boric Acid Positive Electrode for Solid Batteries
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Solution Overview
Problem
Thin-film solid electrolyte batteries require expensive heat-resistant glass substrates for annealing, leading to increased manufacturing costs and characteristic degradation of amorphous solid electrolytes like LiPON, while conventional non-annealing positive electrode materials like LiCoO2, LiMn2O4, and LiFePO4 are poor in ion conductivity.
Innovation Solution
A solid electrolyte battery with a positive electrode active material layer composed of a lithium-boric acid compound in an amorphous state, containing Li, B, and elements such as Cu, Ni, Co, Mn, Au, Ag, or Pd, which functions without annealing, enhancing ion conductivity and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If annealing is performed to improve the crystalline structure of positive electrode active materials, then ion conductivity is improved, but manufacturing cost increases due to the need for expensive heat-resistant glass substrates
Solution Approach 1:
The invention changes the chemical composition parameters of the positive electrode active material by incorporating lithium-boric acid compounds with specific metal elements (Cu, Ni, Co, Mn, Au, Ag, or Pd). This compositional modification allows the material to achieve high ion conductivity and structural stability in an amorphous state without requiring thermal annealing treatment, thereby eliminating the need for expensive heat-resistant glass substrates while maintaining reliable battery performance
Solution Approach 2:
The invention uses composite materials by combining lithium-boric acid compounds with specific metal elements to create a new class of amorphous positive electrode active materials. This composite approach enables the material to exhibit both high ion conductivity and structural stability without crystallization, allowing fabrication on cost-effective substrates without annealing while achieving reliable battery performance
2Reliability
If annealing is performed to improve the properties of positive electrode active materials, then material performance is improved, but characteristic degradation occurs in amorphous solid electrolytes like LiPON
Solution Approach 1:
The invention modifies the chemical composition parameters of the positive electrode active material by incorporating lithium-boric acid compounds with specific metal elements. This compositional design enables the material to maintain structural stability and avoid crystallization at deposition temperatures, preventing characteristic degradation of amorphous solid electrolytes while achieving high material performance without annealing
Solution Approach 2:
The invention applies beforehand cushioning by designing the positive electrode active material composition to inherently resist crystallization during deposition. The lithium-boric acid compound structure with specific metal elements provides thermal stability that cushions against the harmful effects of heating, preventing amorphous-to-crystalline transition that would degrade solid electrolyte characteristics
3Ease of manufacture
If conventional lithium-transition metal oxides are used as positive electrode active materials in non-annealing way, then manufacturing cost is reduced, but ion conductivity is poor
Solution Approach 1:
The invention changes the chemical composition parameters by using lithium-boric acid compounds with specific metal elements (Cu, Ni, Co, Mn, Au, Ag, or Pd) instead of conventional lithium-transition metal oxides. This compositional modification enables the material to achieve high ion conductivity in an amorphous state without annealing, maintaining low manufacturing cost while improving reliability
Solution Approach 2:
The invention employs composite materials by combining lithium-boric acid compounds with specific metal elements to create amorphous positive electrode active materials with superior ion conductivity. This composite approach enables fabrication without annealing on cost-effective substrates while achieving high ion conductivity comparable to or exceeding conventional crystalline materials
Data Source
AI summary
Provided are: a solid electrolyte battery using a novel positive electrode active material that functions in an amorphous state; and a novel positive electrode active material that functions in an amorphous state. The solid electrolyte battery includes: a positive electrode layer including a positive electrode active material layer; a negative electrode layer; and a solid electrolyte layer formed between the positive electrode layer and the negative electrode layer, and the positive electrode active material includes a lithium-boric acid compound in an amorphous state, which contains Li, B, any element M1 selected from Cu, Ni, Co, Mn, Au, Ag, and Pd, and O.