1、 2 3 2013 M 5 % ? S / Energy Storage Science and Technology Vol.2 No.3May 2013EV$ S5 IIIMmMM r g= S S 100190 K 1 MM $15b MM M !V8F !91 p “S b MM V P Hq MM?Z bMFsM M t VMme 4 Z U bl 0M1MMMmb 1oM 0 MM Mm doi 10.3969/j.issn.2095-4239.2013.03.010 ms | O 646.21 DS A cI| 2095-42392013 03-250-17 Fundamenta
2、l scientific aspects of lithium batteries (III) iPhase transition and phase diagram GAO Jian LV Yingchun LI Hong Institute of Physics Chinese Academy of Sciences Beijing 100190 China Abstract: Phase transition is an essential problem in battery research. Understanding on phase transition in synthesi
3、s precisely is necessary to obtain target products with controlled structure and composition. Knowledge about phase transitions of electrolyte can offer the information of the safe and stable working condition, and provide a way to develop new electrolyte according to the characteristics of phase tr
4、ansition. Phase composition and phase evolution can be illustrated concisely and directly in phase diagram. This paper summarizes briefly typical research activities on phase transition and phase diagram in Li-ion batteries during material preparation. Key words ion batteries phase transition phase
5、diagram 1 1 M “d ( B bW uBM1-2b a| qaH 3 Hq/! HMM#M 3 LC V e!$b V a aaH ZE “SMMYV MV b a a8a qaHaM MMSbMF K1 bBt !V1FaHaaa ryN1 I n b/YV+ 8 0e !MM+b 2.2.1 E#%ME! LiAlO2LiAlO2 F K ? YT molten carbonate fuel cellsMCFC b ! B , 9$ T 0 9 4b -LiAlO2;$T%8 BM 0 q 400 H l 108 S/cm Si 400 q V4 104S/cm 10b-LiA
6、lO2 LiCoO2a afirst order phase transitions bsecond order phase transitions m 1 :B B)MM MM Fig. 1 First order phase transitions 35-364 _o YT 0 8 3 | 0a = ( J ) LiTFSILiN(CF3SO2)2a= ( Y ) LiBETILiN(C2F5SO2)2a J LiCF3SO3YF i/ ?i ?T 1s 8“ LiTFSI/Y14 67 LiBETIY8“ V 57 b i V37?C|B LiBOBYF i = ( J ) LiTFSI
7、Y *“ i 7 50 PbN8“ / %87 5i A8 / qMv B+ N VMMb m 11 m 12 V A LiBOB/ CH3CONH2 :1 116 14 H Arrhenius wLs | qi“ S = ?M 7LiBOB/ CH3CONH2 :1 18 16 HArrhenius wL5s b Arrhenius wLsf 9VBZ L LiBOB/ CH3CONH2=Mm f :1 116 14 H8“V V% %A iA8V Arrhenius wL8C M/ ? 7 :1 18 16 HMm V A8“ V% A M Arrhenius wLBS = ?b %M u
8、 LiBOB/ CH3CONH28“ V 0 . % 0. 0 %M1%8 0M u =YV b W# bAM u BA8bA8 R$ s 0B NV ArrheniusZ 0VB K 6B 0 q 0K ? %bVm 13 A LiBOB/ CH3CONH28“NV Arrhenius ZA8 z 0 q ?bLiBOB/ CH3CONH2:1 116 148“ iB%A i bB /%Ms AM 0 ; VVAM. 9 VV%M. V“%M. K8C B (rTbyN%Mi 0 q11AM1%M 0 qb m 11 LiBOB/ CH3CONH28“Mm Fig. 11 Phase dia
9、gram of LiBOB/ CH3CONH2 electrolyte m 12 LiBOBY :1 0 qArrhenius1“m37Fig. 12 Conductivities of LiBOB/ CH3CONH2 electrolytes37 r$ S5IIIiiMmMM M 257 3 Vm 13 m 14 V A i 25 H %8N H q =Ev / ?T 6 40 i 12 h q 4 r ? PT q 6 60 i 12 hX M i A8 q9 v4 ? T1 pN H VT 40 i 12 hN HV V AN/ i *)V 7N H q VT M1 60 HN H v
10、K 25 i 12 hM %8N H ?Tb m 13 LiBOB/CH3CONH2:1 18Li/LiFePO4/ Mv 37Fig. 13 Photographs of the Li/LiFePO4cell with LiBOB/CH3CONH2(18) electrolyte at different temperatures37 NB+T 5F !X V| 0% ?/%i ? 1b q 6 PrMM N H ?Tb 2.3.2 38 |_A8 m 14 LiBOB/CH3CONH2:1 18Li/LiFePO4/ b wL m_ phV V_/phVbV3 RVV a25 6 b40
11、6 c60 d40 e25 37Fig. 14 Charging/discharging records of the Li/LiFePO4cell with LiBOB/CH3CONH2(1:8) electrolyte at different temperatures (a) 25 (Temp. rising); (b) 40 (Temp. rising); (c) 60 ; (d) 40 (Temp. dropping) (e) 25 (Temp. dropping)37“% s0 |_5% 8 7_A8 5 A8 =“ |_A |_7_A8b= fV%88M 8%MMtemperat
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