High-performance nickel metal hydride battery anode with enhanced durability and excellent low-temperature discharge capability  

作　　者：Zhitao Chen Huitian Liu Jean Nei Nian Liu 

机构地区：[1]School of Chemical and Biomolecular Engineering,Georgia Institute of Technology,Atlanta,GA 30332,USA [2]GP Batteries,Hongkong,China

出　　处：《Nano Research》2024年第10期8819-8825,共7页纳米研究（英文版）

基　　金：supported by the National Science Foundation(No.ECCS-2025462);financially supported by Enterprise Support Scheme(ESS),which is one of the funding programs of Innovation and Technology Fund by Hong Kong government and aims to provide funding support for local companies to conduct in-house research and development(R&D)work with a view to encouraging the private sector to invest in R&D.

摘　　要：Current AB_(5)-type hydrogen storage alloys employed in nickel-metal hydride(NiMH)batteries exhibit exceptional low-temperature discharge performance but suffer from limited cycle life and insufficient high-temperature stability.To overcome these challenges,we introduce a hydrothermal synthesized LaF_(3)coating layer on the surface of the AB_(5)anode material.This LaF_(3)coating layer adds a protective barrier for the active material,significantly improving the battery's cycle life and high-temperature stability.Our findings indicate that(1)the LaF_(3)coated anode demonstrates an extended cycle life with increased specific capacity and a capacity retention of 88%after 40 cycles of abusive overcharging and rapid discharging at room temperature.(2)The synthesized anode exhibits a 97%recovery of its specific capacity of 292.7 mAh/g following 144 h of high-temperature storage.(3)The low-temperature discharge capacity of the synthesized anode remains on par with the pristine AB_(5)alloy at 230.4 mAh/g in a-40℃environment.This research presents a significant advancement in hydrogen storage alloy coatings and offers valuable insights for designing electrodes in NiMH batteries.

关 键 词：nickel metal hydride(NiMH)batteries hydrothermal synthesis lanthanum fluoride discharge capacity low temperature 

分 类 号：TM912[电气工程—电力电子与电力传动]