Enhanced Lithium Battery Durability via Precursor Coating Design
Here’s PatSnap Eureka !
Summary
Problems
Current electric storage elements, such as lithium ion batteries and capacitors, face challenges in achieving high energy density, high output characteristics, and durability, with existing solutions experiencing issues like reduced energy density, inferior durability, and micro short-circuits due to gas generation during pre-doping in positive electrode active material layers.
Innovation solutions
A positive electrode precursor and coating liquid comprising a carbon material and lithium transition metal oxide, which promotes the decomposition of alkali metal compounds, reducing resistance and micro short-circuit rates, and enabling high-capacity, high-load charge/discharge cycles by pre-doping alkali metal ions efficiently.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If high-capacity positive electrode active material layers are used to increase energy density, then capacity increases, but micro short-circuits occur due to gas generation during pre-doping
Why choose this principle:
The patent converts the harmful gas generation during pre-doping into a beneficial process by using the gas pressure to promote decomposition of alkali metal compounds. The gas bubbles generated during pre-doping are no longer seen as defects causing micro short-circuits, but as a mechanism that enhances alkali metal compound decomposition and improves overall electrode performance
Principle concept:
If high-capacity positive electrode active material layers are used to increase energy density, then capacity increases, but micro short-circuits occur due to gas generation during pre-doping
Why choose this principle:
The patent changes the chemical composition parameters of the positive electrode active material layer by incorporating specific ratios of carbon material (10-40 wt%), lithium transition metal oxide (5-30 wt%), and alkali metal compound (0.1-5 wt%). These parameter changes optimize the decomposition behavior during pre-doping, controlling gas generation to promote beneficial chemical reactions while preventing harmful micro short-circuits
Application Domain
Data Source
AI summary:
A positive electrode precursor and coating liquid comprising a carbon material and lithium transition metal oxide, which promotes the decomposition of alkali metal compounds, reducing resistance and micro short-circuit rates, and enabling high-capacity, high-load charge/discharge cycles by pre-doping alkali metal ions efficiently.
Abstract
Provided is a positive electrode precursor having a positive electrode active material layer, wherein the mass proportion A1 of a carbon material in the positive electrode active material layer accounts for 15-65 mass%, the mass proportion A2 of a lithium transition metal oxide in the positive electrode active material layer accounts for 5-35 mass%, the mass proportion A3 of an alkali metal compound in the positive electrode active material layer accounts for 10-50 mass%, A2/A1 is 0.10-2.00, A1/A3 is 0.50-3.00, and the positive electrode active material layer has a peel strength of 0.02-3.00 N/cm.