Nonaqueous Electrolyte Battery Low-Temperature Performance
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Solution Overview
Problem
Nonaqueous electrolyte batteries with negative electrodes having an operating potential of 1.2 V (vs. Li/Li+) face challenges in maintaining low-temperature-output performance after high-temperature-storage, as existing solutions do not effectively improve retention rates and are limited by the volume ratio of cyclic and chain carbonates in the electrolyte.
Innovation Solution
A nonaqueous electrolyte battery configuration with a chain carbonate and/or chain carboxylate as the main solvent at a ratio of 70 volume % or higher, containing specific compounds defined by general formulas, and a negative electrode with a spinel type lithium titanate, optimizing the volume ratio of cyclic to chain carbonates to enhance low-temperature-output performance after high-temperature-storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a negative electrode with an operating potential of 1.2 V (vs. Li/Li+) or higher is used, then the battery voltage and energy density are improved, but the low-temperature-output performance after high-temperature-storage deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing specific compounds ( formulas (1) and (2)) with controlled ratios of cyclic carbonate to chain carbonate (10% or less). This parameter change modifies the electrolyte's properties to maintain stable SEI films at both high and low temperatures, resolving the contradiction between high energy density and low-temperature performance after high-temperature storage
Solution Approach 2:
The patent creates a composite electrolyte system combining multiple components: cyclic carbonates, chain carbonates, and the specific compounds of formulas (1) and (2). This composite approach leverages the synergistic effects of different electrolyte components to achieve both high energy density (through stable high-voltage operation) and maintained low-temperature performance after high-temperature storage
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 proposed configuration significantly improves low-temperature-output performance retention rates by optimizing the solvent composition and electrode material, ensuring excellent performance even after high-temperature-storage.
Implementation Method 1
contains a compound defined by a general formula (1), (2), or (3)... the nonaqueous electrolyte contains a chain carbonate and/or a chain carboxylate as a main solvent at a ratio of 70 volume % or higher... significantly improves low-temperature-output performance retention rates by optimizing the solvent composition and electrode material
Data Source
AI summary
An additive typified by tris(trimethylsilyl)phosphate, tris(trimethylsilyl)borate, and tetrakis(trimethylsiloxy)titanium (Chem. 3) are applied to a nonaqueous electrolyte containing a chain carbonate and/or a chain carboxylate as a main solvent (contained at a ratio of 70 volume % or higher). It is preferable that 0≦a<30 is satisfied, in which “a” denotes the volume of a cyclic carbonate among carbonates having no carbon-carbon double bond in the entire volume, defined as 100, of the carbonates having no carbon-carbon double bond and chain carboxylates in a nonaqueous solvent contained in the nonaqueous electrolyte (0<a<30 in the case no chain carboxylate is contained).