Battery monomer, positive electrode sheet, lithium supplementing agent and electric device

By doping lithium oxalate with BO33- ions as a lithium supplement, a suitable CEI film is formed, which solves the problem of insufficient charge-discharge specific capacity and initial coulombic efficiency of secondary batteries during charge-discharge processes, and improves the electrochemical performance of the battery.

CN122224754APending Publication Date: 2026-06-16CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202411844271.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-13
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Existing secondary batteries suffer from insufficient charge/discharge specific capacity and initial coulombic efficiency during charge and discharge processes. In particular, the structure of the positive electrode active material is prone to irreversible changes under high voltage, which affects the cycle stability of the battery.

Method used

A lithium supplement agent doped with BO33- ions is used to form a boron-rich solid electrolyte membrane, which reduces the interfacial resistance of lithium ions shuttling through the solid electrolyte membrane, improves the lithium ion migration ability, and fully decomposes at low voltage to form a suitable CEI film to improve battery performance.

Benefits of technology

It improves the charge/discharge specific capacity and initial coulombic efficiency of individual battery cells, reduces the decomposition voltage, and enhances the cycle stability and initial delithiation specific capacity of the battery.

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Abstract

This application provides a battery cell, which includes a positive electrode, a negative electrode, and an electrolyte. The positive electrode includes a positive current collector and a positive electrode film disposed on at least one side of the positive current collector. The positive electrode film includes a positive active material and a lithium replenishing agent. The lithium replenishing agent includes a first lithium replenishing agent, which comprises a component having the following general formula I: Li a (C2O4) x (BO3) y General formula I, where 0 < a < 4, 0 < x < 1, 0 < y < 1. The first lithium supplement agent of this application is obtained by doping lithium oxalate with BO3. 3‑ The presence of ions results in a low decomposition voltage and excellent initial delithiation specific capacity. The battery cell of this application exhibits excellent charge / discharge specific capacity and initial coulombic efficiency.
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