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【学术预告】高钠含量水钠锰矿结晶水及多面体调控用于高效储钠

化行楼 226

BAOGAOTIMU: GAONAHANLIANGSHUINAMENGKUANGJIEJINGSHUIJIDUOMIANTIDIAOKONGYONGYUGAOXIAOCHUNA

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BAOGAOSHIJIAN: 1YUE3RI(ZHOUWU)SHANGWU9:30

BAOGAODIDIAN: HUAXINGLOU226HUIYISHI

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XIAHUI,NANJINGLIGONGDAXUECAILIAOKEXUEYUGONGCHENGXUEYUANJIAOSHOU、BOSHISHENGDAOSHI,JIANGSUSHENGJIECHUQINGNIANKEXUEJIJINHUODEZHE、ZHONGGUOGUISUANYANXUEHUIGUTAILIZIXUEFENHUILISHI、2018KERUIWEIAN“GAOBEIYINKEXUEJIA”。XIANHOUYU2000NIANHE2003NIANZAIBEIJINGKEJIDAXUEHUODEXUESHIHESHUOSHIXUEWEI。HOUSHICONGXINJIAPOGUOLIDAXUEDELVLIJIAOSHOU,BINGYU2007NIANHUODEBOSHIXUEWEI。BOSHIBIYEHOUZAIXINJIAPOGUOLIDAXUEJIXIEGONGCHENGXICONGSHIBOSHIHOUYANJIUGONGZUOZHI2011NIAN。YU2011NIANCHUBEIYINJINDAONANJINGLIGONGDAXUECAILIAOKEXUEYUGONGCHENGXUEYUAN,WEIGELAITENAMIKEJIYANJIUSUONAMINENGYUANCAILIAO(NEM)KETIZUFUZEREN(http://nem.smse-njust.com/)。ZAINat Commun、Adv Mater、ACS Nano、Adv Funct Mater、Adv Energy Mater、Nano EnergyDENGQIKANFABIAOLUNWEN130YUPIAN,XIANGGUANLUNWENBEISCILUNWENYINYONGCHAOGUO8000YUCI。

yabo登录ZHUYAOCONGSHIQUANGUTAIBOMOLIDIANCHI,CHAOJIDIANRONGQIYIJIXINXINGCHUNENGTIXIGUANJIANCAILIAOYUQIJIANDEYANJIU。ZHONGDIANTANSUOGAOXINGNENGQUANGUTAIBOMODIANCHIDEPILIANGZHIBEIJISHU、SANWEIDIANCHIJIEGOUSHEJI,WEIXINYIDAIGAOXIAOCHUNENGQIJIANZAIXIAOFEILEIDIANZI、KECHUANDAISHEBEI、DIANDONGQICHE、JUNGONGHANGTIANYIJINENGYUANHULIANWANGZHONGDEGUANGFANYINGYONGTIGONGJICHU。

BAOGAOJIANJIE:

相比于O3和P2的层状结构,水钠锰矿具有较大的层间距,适合快速的Na+扩散,但受限于低Na含量和较多的层间结晶水,作为钠离子电池正极难以实现高比容量和长循环寿命[1-3]。本工作通过对Mn3O4的氧化嵌Na反应,实现尖晶石到水钠锰矿的结构转变,通过Na含量、层间结晶水和多面体构型的调控,获得新型高Na含量的水钠锰矿正极材料。首次报道了Na/Mn摩尔比为1的高Na含量水钠锰矿材料,并通过构建新型Mn(OH)8六面体构型,实现了水钠锰矿层状材料在去除层间结晶水后保持0.7 nm的宽层间距,有效提高了水钠锰矿层状材料的结构稳定性。获得的新型高Na含量的水钠锰矿材料表现出优异的储Na性能,电极比容量超过210 mAh/g,50C充放电仍能达到156 mAh/g,10C下循环1000次容量保持率高达94.6%。本工作通过新构型多面体调控,为水钠锰矿材料的研究开拓了新方向,为高性能钠离子电池正极材料的开发提供了新思路。

yabo登录[1] Nawishta Jabeen, Ahmad Hussain, Qiuying Xia, Shuo Sun, Junwu Zhu*, Hui Xia*,Adv. Mater. 29 (2017) 1700804.

yabo登录[2] H. Xia*, X. Zhu, J. Liu, Q. Liu, S. Lan, Q. Zhang, X. Liu, J. K. Seo, T. Chen, L. Gu*, Y. S. Meng*, Nat. Commun. Vol. 9 (2018) 5100.

[3] Baowei Lin, Xiaohui Zhu, Lingzhe Fang, Xinyi Liu, Shuang Li, Teng Zhai, Liang Xue, Qiubo Guo, Jing Xu*, Hui Xia*, Adv. Mater. 31 (2019) 1900060.

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    2019NIAN12YUE31RI 16:37

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