Overcharge performance of LiMn₂O₄/graphite battery with large capacity

Abstract

The LiMn₂O₄/graphite battery was fabricated and its 3 C/10 V overcharge performance was studied. Spinel LiMn₂O₄ was synthesized by solid-state method and 325680-type size full battery was fabricated. The structure and morphology of the powders were characterized by XRD and SEM technique, respectively. The battery explodes after 3 C/10 V overcharged test, and surface temperature of the battery case arrives at 290 °C in 12 s after exploding. Black air is given out with blast. Carbon, MnO, and Li₂CO₃ are observed in the exploded powders. The cathode electrode remains spinel structure with 5.0 V charged. Cracks in the cathode electrode particles are detected with the increase of voltage by SEM technique. The 5.0 V charged electrode can decompose into Mn₃O₄ at 400 °C. It is demonstrated that the decomposition of 5.0 V charged electrode can be promoted and Mn⁴⁺ can be deoxidized to Mn²⁺ by carbon and electrolyte through the simulation of blast process.

Keywords

LiMn₂O₄ / MnO / battery / overcharge / blast

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