Lithium-Ion Battery with Titanium Negative Electrode for Low-Temperature Output
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Solution Overview
Problem
Lithium-ion batteries combined with lead-acid batteries in vehicles face low low-temperature output performance due to the state of charge being adjusted to 10 to 30% when connected in series, resulting in inadequate performance at the working voltage of lead-acid batteries.
Innovation Solution
A nonaqueous electrolyte battery design featuring a positive electrode with a LiMO2 active material and a spatially separated titanium-containing oxide negative electrode, optimizing the weight ratio to achieve a positive electrode potential of 3.75 V or more, enhancing discharge capacity and cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If lithium ion batteries are connected in series with lead-acid batteries to achieve 13.5V operating potential, then the battery system can be used in combination with lead storage batteries, but the state of charge drops to 10-30% resulting in low low-temperature output performance
Solution Approach 1:
The patent changes the operating potential parameters of the lithium ion battery by adjusting the positive electrode material composition (using LiNi0.8Co0.1Mn0.1O2 with specific ratios) and controlling the potential to be 3.75V or more vs Li/Li+, which shifts the charge-discharge characteristics to improve low-temperature output performance while maintaining compatibility with lead-acid battery systems
2Adaptability or versatility
If six lithium ion batteries are connected in series to achieve 13.5V, then the operating potential matches lead-acid batteries, but the low-temperature output performance deteriorates due to 10-30% state of charge
Solution Approach 1:
The patent modifies the electrochemical parameters of the lithium ion battery by using specific positive electrode materials (LiNi0.8Co0.1Mn0.1O2) and controlling the potential range (3.75V or more vs Li/Li+), which maintains system compatibility while improving power output at low temperatures
Solution Approach 2:
The patent employs composite electrode materials combining LiNi0.8Co0.1Mn0.1O2 positive electrode with spinel type lithium-titanium oxide negative electrode, creating a composite battery system that achieves both lead-acid compatibility and enhanced low-temperature performance
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 optimized battery design improves low-temperature output performance and cycle characteristics, ensuring better energy density and reduced degradation, thus addressing the low performance issues of lithium-ion batteries when used with lead-acid batteries in vehicles.
Implementation Method 1
a nonaqueous electrolyte housed in the container
Implementation Method 2
a lithium-nickel-cobalt-manganese composite oxide is used for the positive electrode, and a spinel type lithium-titanium oxide is used for the negative electrode
Data Source
AI summary
According to one embodiment, a nonaqueous electrolyte battery includes a container, a positive electrode housed in the container, a negative electrode housed in the container, and a nonaqueous electrolyte housed in the container. The positive electrode includes a positive electrode active material represented by a general formula LiMO2 (M is one or more elements selected from a group consisting of Ni, Co, and Mn). The negative electrode is spatially separated from the positive electrode and includes a titanium-containing oxide as a negative electrode active material. A potential of the positive electrode is 3.75 V or more vs. Li/Li+, when an open circuit voltage of a nonaqueous electrolyte battery is 2.17 V.