Page 123 - 《精细化工》2020年第8期
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第 37 卷第 8 期                             精   细   化   工                                  Vol.37, No.8
             202 0 年 8 月                             FINE CHEMICALS                                 Aug.    2020


              有机电化学与工业
                            烧结温度对 Fe(OH) 胶体制备 Fe O                                         3
                                                               3
                                                                                       2
                                          材料储锂性能的影响



                                 姚金环      1,2 ,张竹柳      1,2 ,杨永德       1,2 ,李延伟      1,2*

                 (1.  广西电磁化学功能物质重点实验室,广西  桂林    541004;2.  桂林理工大学  化学与生物工程学院,
                 广西  桂林    541004)

                 摘要:以 Fe(OH) 3 胶体为铁源,探索了一步烧结法制备二维片状结构 Fe 2 O 3 电极材料,考察了烧结温度(400、
                 500、600 和 700  ℃)对材料微观结构和储锂性能的影响。结果表明:400  ℃烧结的样品为 α-Fe 2 O 3 /Fe 3 O 4 复合
                 材料,其他温度烧结得到的是纯的 α-Fe 2 O 3 ;随着烧结温度的升高,组成片状结构致密相连的不规则颗粒逐渐分
                 离,二维片状结构接近坍塌。电化学性能研究发现:500  ℃下得到的样品电极具有相对较好的储锂性能,在 1 A/g
                 的电流密度下循环 450 圈后放电比容量达 628.6 mA·h/g,当电流密度为 4 A/g 时,放电比容量仍有 352.3 mA·h/g。
                                                          +
                 动力学及电极稳定性分析发现,500  ℃烧结的样品 Li 扩散系数最大(还原峰和氧化峰对应的扩散系数值分别为:
                                      2
                 1.57×10 –13 和 4.60×10 –13  cm /s),充放电循环过程中结构稳定性最好。
                 关键词:氧化铁;负极材料;锂离子电池;氢氧化铁胶体;蔗糖;有机电化学
                 中图分类号:TM192      文献标识码:A      文章编号:1003-5214 (2020) 08-1621-08


                    Effect of calcination temperature on lithium storage performance of

                                 Fe 2O 3 material prepared from Fe(OH) 3 colloid

                                                                            1,2
                                                            1,2
                                           1,2
                               YAO Jinhuan , ZHANG Zhuliu , YANG Yongde , LI Yanwei     1,2*
                 (1. Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, Guilin 541004, Guangxi,
                 China; 2. College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, Guangxi, China)

                 Abstract: Two-dimensional flake Fe 2O 3 electrode materials were prepared by one-step sintering method
                 using Fe(OH) 3 colloid as iron source. The effects of sintering temperature (400, 500, 600, and 700  ℃) on
                 the  microstructure  and  lithium  storage  performance  of  Fe 2O 3  samples  were  investigated.  The  results
                 demonstrated that the sample sintered at 400  ℃ was α-Fe 2O 3/Fe 3O 4 composites, while the samples sintered
                 at 500, 600, and 700  ℃  were single phase α-Fe 2O 3. With the increase of sintering temperature, the tight
                 connected irregular particles in the flake gradually got separated so that the two-dimensional flake structure
                 tended  to  collapse.  The  results  of  electrochemical  performance  tests  showed  that  the  electrode  prepared
                 from the sample sintered at 500  ℃  exhibited relative good lithium storage performance, a high specific
                 discharge  capacity  of 628.6 mA·h/g  still  remained  after 450  cycles at 1 A/g,  and  the  specific  discharge
                 capacity maintained at 352.3 mA·h/g even at 4 A/g. The kinetic and the cycling stability results revealed
                                              +
                 that this electrode had the largest Li  diffusion coefficient (the diffusion coefficient values corresponding to
                                                                           2
                                                        –13
                                                                     –13
                 reduction peak and oxidation peak are 1.57×10  and 4.60×10  cm /s, respectively), and displayed the
                 best structural stability in the process of charging and discharging cycle.
                 Key  words:  iron  oxide;  anode  materials;  lithium  ion  batteries;  iron  hydroxide  colloid;  sucrose;
                 electro-organic chemistry


                 锂离子电池(LIBs)具有能量密度高、循环寿                        命长、使用温度范围宽等优点,被广泛应用于便携


                 收稿日期:2019-10-21;  定用日期:2020-03-30; DOI: 10.13550/j.jxhg.20190998
                 基金项目:国家自然科学基金(51964012);广西自然科学基金(2017GXNSFAA198117)
                 作者简介:姚金环(1980—),女,教授,E-mail:yaojinhuan@126.com。联系人:李延伟(1979—),男,教授,E-mail:lywhit@126.com。
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