Rice husk derived porous carbon/β-PbO₂ composites as positive additives for lead‑carbon batteries

IF 8.9 2区 工程技术 Q1 ENERGY & FUELS
Yunfeng Ji , Jian Tu , Yapeng He , Hongbiao Wang , Hao Zhao , Jianfeng Zhou , Hui Huang , Zhongcheng Guo
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Abstract

The continuous improvement of negative electrode in lead‑carbon batteries (LCBs) renders the positive electrode a considerable obstacle in overall performances of LCBs. Rice husk derived porous carbon/β-PbO2 (RHC/β-PbO2) composite was synthesized and incorporated as positive additive to improve the utilization efficiency of positive active substances (PASs). The effects of RHC/β-PbO2 additives on the substance conversion, crystalline size, and utilization efficiency of positive plates were investigated during the curing, formation, and cycling stages. The remarkable conductivity of porous RHC/β-PbO2 composite provides an efficient conductive network, while the hydrophilicity regulates the local ion transfer environment, significantly accelerating electron/ion transfer within PASs. The highest initial discharge capacity of 3.31 Ah at 0.05C was achieved at 1.2 wt% RHC/β-PbO2, representing 19.9 % promotion over the blank battery. Meanwhile, the LCBs could maintain a discharge capacity of 1.65 Ah on 1C and deliver a capacity retention ratio of 86.8 % after 200 cycles, demonstrating exceptional rate capability and cyclic durability. The comprehensive work proposes an alternative approach for developing powerful positive additives and promoting the substance transformation in LCBs.

Abstract Image

稻壳衍生多孔碳/β-PbO₂复合材料作为铅碳电池的正极添加剂
铅碳电池负极的不断改进使得正极成为影响铅碳电池整体性能的一大障碍。合成了稻壳衍生多孔碳/β-PbO2 (RHC/β-PbO2)复合材料,并将其作为正极添加剂掺入,以提高正极活性物质(PASs)的利用效率。研究了RHC/β-PbO2添加剂对正极板固化、形成和循环过程中物质转化率、结晶尺寸和利用效率的影响。多孔RHC/β-PbO2复合材料卓越的导电性提供了高效的导电网络,而亲水性调节了局部离子转移环境,显著加速了PASs内的电子/离子转移。当RHC/β-PbO2质量分数为1.2 wt%时,在0.05C条件下获得了3.31 Ah的最高初始放电容量,比空白电池提升了19.9%。同时,lcb在1C下可以保持1.65 Ah的放电容量,并且在200次循环后的容量保持率为86.8%,表现出卓越的倍率能力和循环耐久性。综合工作提出了一种开发强效正性添加剂和促进lcb中物质转化的替代方法。
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来源期刊
Journal of energy storage
Journal of energy storage Energy-Renewable Energy, Sustainability and the Environment
CiteScore
11.80
自引率
24.50%
发文量
2262
审稿时长
69 days
期刊介绍: Journal of energy storage focusses on all aspects of energy storage, in particular systems integration, electric grid integration, modelling and analysis, novel energy storage technologies, sizing and management strategies, business models for operation of storage systems and energy storage developments worldwide.
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