Lithium Nickel Silicate Glass Cathodes Without Cobalt or Vanadium
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Solution Overview
Problem
Existing positive electrode materials for lithium-ion batteries face challenges such as instability, high cost, toxicity, and limited energy density, which hinder their widespread adoption in applications requiring high energy densities, particularly in electric vehicles.
Innovation Solution
Development of ternary lithium nickel silicate glasses with a formula x Li2O - y NiO - (100-xy) SiO2, which are amorphous and synthesized through a quenching process, offering high capacity and energy density without using economically critical or toxic metals like cobalt or vanadium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LiCoO2 is used for positive electrode, then high energy density is achieved, but instability and high cost occur due to cobalt usage
Solution Approach 1:
The patent changes the chemical composition parameters by replacing cobalt with nickel in the lithium transition metal oxide structure, developing LiNi1-xMxO2 materials where M can be Mn, Co, Al, or other elements. This parameter substitution maintains the high energy density characteristics while improving stability and reducing cobalt dependency
Solution Approach 2:
The patent employs composite material strategies by creating mixed-metal lithium transition metal oxides (LiNi1-xMxO2) where multiple elements are combined. The nickel-based structure is复合 with stabilizing elements to achieve both high energy density and improved structural stability during cycling
2Reliability
If LiFePO4 is used for positive electrode, then high intrinsic safety and good lifespan are achieved, but limited energy density occurs
Solution Approach 1:
The patent changes the voltage parameter by using nickel-based cathodes that operate at higher potentials (3.7-3.9V vs. Li/Li+) compared to LiFePO4 (3.2V), thereby achieving higher energy density while maintaining safety through proper material design and stabilization strategies
3Use of energy by moving object
If vanadium-based glass electrodes are used, then high energy density is achieved, but toxicity and cost problems occur
Solution Approach 1:
The patent extracts vanadium from the glass electrode composition and replaces it with nickel-based oxides. The invention removes the toxic element (vanadium) while maintaining the glass matrix structure and electrochemical performance through nickel-containing compounds
Solution Approach 2:
The patent changes the compositional parameters by substituting vanadium with nickel and other non-toxic elements in the glass electrode formulation, achieving similar or superior energy density without the toxicity associated with vanadium
4Use of energy by moving object
If cobalt is used in positive electrode materials, then high energy density is achieved, but high cost occurs due to economically critical cobalt prices
Solution Approach 1:
The patent extracts cobalt from the cathode material composition and replaces it with nickel as the primary transition metal. The invention removes the expensive element (cobalt) while maintaining electrochemical performance through nickel-based structures, significantly reducing material cost
Solution Approach 2:
The patent substitutes expensive cobalt with cheaper nickel, which is more abundant and economically viable. The nickel-based cathode materials provide comparable performance at lower cost, making them more suitable for large-scale commercial application
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 ternary lithium nickel silicate glasses achieve theoretical specific capacities exceeding 80 mAh/g and up to 180 mAh/g, addressing the limitations of existing materials by providing high energy density and stability for metal-ion batteries.
Implementation Method 1
a step (i) of quenching a molten mixture (A), which consists of or comprises a source of NiO, a source of Li2O and a source of SiO2, to obtain said glass
Data Source
Figure 1~2
AI summary
The present invention relates to lithium nickel silicate ternary glasses, as well as a process for their production. The invention also relates to the preparation and use of said glasses as active materials for positive electrodes, in particular for metal-ion batteries, as well as said active materials and electrodes per se.