US12573668USUSPTO Grant XML

Neutral zinc manganese secondary battery and electrolyte

The neutral zinc manganese battery includes a neutral zinc manganese flow battery and a power battery. The flow battery includes positive electrode, negative electrode, electrolyte and membrane. The corresponding flow battery includes positive and negative pumps, pipelines and storage tanks. For the power battery, the electrolyte is stored in the porous electrode, while for the flow battery, the positive and negative electrolyte flows through the positive and negative electrodes through the pump and pipeline and finally returns to the storage tank to realize the circulation of electrolyte in the electrode chamber and storage tank. In addition, the positive and negative electrode electrolyte is a neutral solution of zinc salt and manganese salt with specific composition. During charging, MnO 2 of the positive electrode can be oxidized directly to -MnO 2 . During discharge, MnO 2 dissolves into Mn 2+ .

Patent

Brief

Patent brief

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Novelty

The flow battery includes positive electrode, negative electrode, electrolyte and membrane.

Uses

Lithium-ion cells, EV batteries, Grid storage

Assignee

DALIAN INSTITUTE OF CHEMICAL PHYSICS, CHINESE ACADEMY OF SCIENCES

Published

Mar 10, 2026

Inventors

Xianfeng Li, Congxin Xie, Huamin Zhang

Domain

Mobility / storage

Plain-English summary

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Solution

The neutral zinc manganese battery includes a neutral zinc manganese flow battery and a power battery.

Key novelty

The flow battery includes positive electrode, negative electrode, electrolyte and membrane.

Applications

Lithium-ion cellsEV batteriesGrid storage

Relevant search intents

electrolyte

Claims preview

1 . A zinc manganese secondary battery, comprising: a positive electrode, a negative electrode, a positive electrolyte, a negative electrolyte, and a membrane disposed between the positive electrode and the negative electrode, wherein the positive electrolyte and the negative electrolyte are aqueous solutions containing potassium chloride, potassium acetate, or both, and a plurality of salts and having a pH value of 4-6, wherein the plurality of salts are selected from the group consisting of manganese acetate, manganese chloride, zinc acetate, and zinc chloride, wherein a molar ratio of manganese salt to zinc salt is 1:1 to 1:2, a molar ratio of potassium ion to manganese ion is 4:1 to 2:1, and a molar ratio of acetate anion to manganese ion is 4:1 to 1:1, wherein the membrane is a porous composite membrane comprising a substrate and a polymer resin coating on a surface exposed to the positive electrode, and wherein the substrate is prepared from one or more polymers of PES, PVC, PSF, and PE, and the polymer resin coating comprises one or more of SPEEK, PBI, and a sulfonated tetrafluoroethylene based fluoropolymer-copolymer. 2 . The zinc manganese secondary battery according to claim 1 , wherein the positive electrolyte and the negative electrolyte contains 0.1-1.5 M of zinc ion, 0.1-1.5 M of manganese ion, and 0.1-6 M of acetate ion. 3 . The zinc manganese secondary battery according to claim 2 , wherein the molar ratio of manganese salt to zinc salt is 1:1.

Linked approaches

Fire-resistant electrolytes

Electrolyte formulations that suppress ignition and heat release.

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