首页|钠离子陶瓷固态电解质Na5-xY1-xZrxSi4O12的制备与性能探究

钠离子陶瓷固态电解质Na5-xY1-xZrxSi4O12的制备与性能探究

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近年来,钠离子固态电池作为可充电电池的一员逐渐进入人们的视野.固态电池的优点在于避免使用液态电解质,从而可以规避电池泄漏和爆炸等风险.目前钠离子固态电解质的研究难点是如何提高室温下的离子电导率.为此,通过在固态电解质材料Na5YSi4O12(NYS)中引入高价离子Zr4+以提高其离子电导率.实验以NaNO3、YN3O9·6H2O、C8H20O4Si和ZrO(NO3)2·xH2O为起始物质,采用新型溶液辅助的固相反应法(SASSR)制备了具有六方晶系结构的固态电解质 Na5-xY1-xZrxSi4O12(x=0.04、0.06、0.08、0.10、0.12),着重研究了 Na5-xY1-xZrxSi4O12(NYZS)中 Zr4+的加入量和烧结温度与离子电导率之间的关系.研究发现,当x=0.08时,室温下离子电导率最高为2.13 mS·cm-1,活化能较低仅为0.222 eV.相比于未掺杂Zr4+的Na5YSi4O12(NYS)材料电导率得到较大的提升.其较高的电导率得益于高价Zr4+掺杂后出现的钠空位,增强了 Na+传输浓度.此研究表明Na5-xY1-xZrxSi4O12是一种具有竞争力的钠离子固态电解质,有望成为新一代储能的研究热点.
Preparation and Properties of Na5-xY1-xZrxSi4O12 Sodium-ion Ceramic Solid Electrolyte
In recent years,sodium-ion solid-state batteries have gradually attracted attentions as a member of rechargeable batteries.In solid-state batteries,liquid electrolytes are avoided,thus diminishing the risks such as leakage and explosion.At present,it is still a challenge to increase the ionic conductivity of solid-state electrolytes.In this study,Zr4+was introduced into Na5YSi4O12(NYS),where NaNO3,YN3O9·6H2O,C8H20O4Si and ZrO(NO3)2·xH2O were used as starting materials.A solution-assisted solid-phase reaction method(SASSR)was employed to prepare the solid electrolytes Na5-xY1-xZrxSi4O12(x=0.04,0.06,0.08,0.10,0.12)with hexagonal crystal structure.The effect of Zr4+on ionic conductivity of Na5-xY1-xZrxSi4O12(NYZS)was studied,while the maximum ionic conductivity of 2.13 mS·cm-1 was achieved at x=0.08,with an activation energy of 0.222 eV.Compared with that of NYS,the conductivity of NYZS is greatly increased,due to the presence of sodium vacancies after Zr4+doping.In summary,Na5-xY1-xZrxSi4O12 is a competitive sodium-ion solid-state electrolyte,which is expected to become promising candidate for new generation of energy conversion.

sodium-ion batterysolid-state electrolyteNa5-xY1-xZrxSi4O1ionic conductivityionic doping

徐瑶、刘立敏、周晓亮、郭炜琳、李婕、郭心如

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西南石油大学化学化工学院,四川成都 610500

钠离子电池 固态电解质 Na5-xY1-xZrxSi4O12 离子电导率 离子掺杂

国家自然科学基金国家重点研发计划

220752312021YFB4001502

2024

陶瓷学报
景德镇陶瓷学院

陶瓷学报

CSTPCD北大核心
影响因子:0.7
ISSN:1000-2278
年,卷(期):2024.45(4)